Windows driver isn't thread-safe

[lowenna]

(I have a fix, PR soon).

This was found while I was investigating moby/libnetwork#1950 (although granted that uses the original boltdb). However the issue is still in the latest maintained version here.

Here's a simple test program which simulates the issue - all it does is have a number of goroutines attempt to open a database simultaneously.

package main

import (
        "fmt"
        "os"
        "sync"

        bolt "github.com/etcd-io/bbolt"
)

func main() {
        const instances = 30
        var wg sync.WaitGroup
        for instance := 0; instance < instances; instance++ {
                wg.Add(1)
                go opener(instance, &wg)

        }
        wg.Wait()
        fmt.Println("Success :)")
}

func opener(instance int, wg *sync.WaitGroup) {
        defer wg.Done()
        db, err := bolt.Open(`c:\bolt\test.db`, 0600, nil)
        if err != nil {
                panic(fmt.Sprintf("instance %d failed to open: %s", instance, err))
                os.Exit(-1)
        }
        db.Close()
}

Now run it a few times - due it being a race condition, it may succeed, as it does the first time below. Note this is run with $env:GOTRACEBACK=2 set. The important part is at the top of the output: panic: instance 0 failed to open: open c:\bolt\test.db.lock: Access is denied, although occasionally you will see The process cannot access the file cause it is being used by another process

PS E:\go\src\github.com\etcd-io\bbolt\test> .\test.exe
Success :)
PS E:\go\src\github.com\etcd-io\bbolt\test> .\test.exe
2018/09/11 09:37:13 bolt.Close(): funlock error: The handle is invalid.
panic: instance 0 failed to open: open c:\bolt\test.db.lock: Access is denied.

goroutine 19 [running]:
panic(0x4ca040, 0xc0001a4000)
        C:/Go/src/runtime/panic.go:556 +0x2d9 fp=0xc000095f48 sp=0xc000095eb8 pc=0x42a129
main.opener(0x0, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:27 +0x1a3 fp=0xc000095fd0 sp=0xc000095f48 pc=0x4b61b3
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc000095fd8 sp=0xc000095fd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 1 [semacquire]:
runtime.gopark(0x4fab80, 0x5b39c0, 0x401911, 0x4)
        C:/Go/src/runtime/proc.go:302 +0x100 fp=0xc00007de50 sp=0xc00007de30 pc=0x42c260
runtime.goparkunlock(0x5b39c0, 0xc000051911, 0x4)
        C:/Go/src/runtime/proc.go:308 +0x5a fp=0xc00007de80 sp=0xc00007de50 pc=0x42c31a
runtime.semacquire1(0xc000058078, 0xc00007de00, 0x1)
        C:/Go/src/runtime/sema.go:144 +0x1ca fp=0xc00007dee8 sp=0xc00007de80 pc=0x4398ba
sync.runtime_Semacquire(0xc000058078)
        C:/Go/src/runtime/sema.go:56 +0x40 fp=0xc00007df10 sp=0xc00007dee8 pc=0x4394a0
sync.(*WaitGroup).Wait(0xc000058070)
        C:/Go/src/sync/waitgroup.go:130 +0x6b fp=0xc00007df38 sp=0xc00007df10 pc=0x461a9b
main.main()
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:19 +0xa6 fp=0xc00007df98 sp=0xc00007df38 pc=0x4b5fb6
runtime.main()
        C:/Go/src/runtime/proc.go:201 +0x207 fp=0xc00007dfe0 sp=0xc00007df98 pc=0x42be97
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc00007dfe8 sp=0xc00007dfe0 pc=0x452301

goroutine 2 [force gc (idle)]:
runtime.gopark(0x4fab80, 0x5abfd0, 0x1410, 0x1)
        C:/Go/src/runtime/proc.go:302 +0x100 fp=0xc000037f80 sp=0xc000037f60 pc=0x42c260
runtime.goparkunlock(0x5abfd0, 0x1410, 0x1)
        C:/Go/src/runtime/proc.go:308 +0x5a fp=0xc000037fb0 sp=0xc000037f80 pc=0x42c31a
runtime.forcegchelper()
        C:/Go/src/runtime/proc.go:251 +0xc1 fp=0xc000037fe0 sp=0xc000037fb0 pc=0x42c0c1
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc000037fe8 sp=0xc000037fe0 pc=0x452301
created by runtime.init.4
        C:/Go/src/runtime/proc.go:240 +0x3c

goroutine 3 [GC sweep wait]:
runtime.gopark(0x4fab80, 0x5ac0c0, 0x41140c, 0x1)
        C:/Go/src/runtime/proc.go:302 +0x100 fp=0xc000039f80 sp=0xc000039f60 pc=0x42c260
runtime.goparkunlock(0x5ac0c0, 0x50140c, 0x1)
        C:/Go/src/runtime/proc.go:308 +0x5a fp=0xc000039fb0 sp=0xc000039f80 pc=0x42c31a
runtime.bgsweep(0xc000040000)
        C:/Go/src/runtime/mgcsweep.go:52 +0x9d fp=0xc000039fd8 sp=0xc000039fb0 pc=0x41e21d
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc000039fe0 sp=0xc000039fd8 pc=0x452301
created by runtime.gcenable
        C:/Go/src/runtime/mgc.go:216 +0x5f

goroutine 18 [finalizer wait]:
runtime.gopark(0x4fab80, 0x5c65d0, 0x50140f, 0x1)
        C:/Go/src/runtime/proc.go:302 +0x100 fp=0xc00003bf28 sp=0xc00003bf08 pc=0x42c260
runtime.goparkunlock(0x5c65d0, 0x140f, 0x1)
        C:/Go/src/runtime/proc.go:308 +0x5a fp=0xc00003bf58 sp=0xc00003bf28 pc=0x42c31a
runtime.runfinq()
        C:/Go/src/runtime/mfinal.go:175 +0xa7 fp=0xc00003bfe0 sp=0xc00003bf58 pc=0x415a57
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc00003bfe8 sp=0xc00003bfe0 pc=0x452301
created by runtime.createfing
        C:/Go/src/runtime/mfinal.go:156 +0x68

goroutine 20 [runnable, locked to thread]:
runtime.cgocall(0x453b00, 0xc000106648, 0x463e42)
        C:/Go/src/runtime/cgocall.go:128 +0x55 fp=0xc000097bf8 sp=0xc000097bc0 pc=0x403645
syscall.Syscall9(0x7ff8acea1d30, 0x7, 0xc000156030, 0xc0000000, 0x3, 0x0, 0x4, 0x80, 0x0, 0x0, ...)
        C:/Go/src/runtime/syscall_windows.go:198 +0x102 fp=0xc000097c28 sp=0xc000097bf8 pc=0x443712
syscall.CreateFile(0xc000156030, 0x3c0000000, 0x0, 0x8000000004, 0x0, 0xc000097d28, 0x43f486, 0x14)
        C:/Go/src/syscall/zsyscall_windows.go:295 +0xd8 fp=0xc000097cc0 sp=0xc000097c28 pc=0x465648
syscall.Open(0xc000110080, 0x14, 0x80040, 0x180, 0x5, 0x14, 0xc000110080)
        C:/Go/src/syscall/syscall_windows.go:289 +0x112 fp=0xc000097d28 sp=0xc000097cc0 pc=0x464b42
os.openFile(0xc000110080, 0x14, 0x40, 0x180, 0x1, 0xc000110080, 0xc00011008f)
        C:/Go/src/os/file_windows.go:97 +0xa3 fp=0xc000097d70 sp=0xc000097d28 pc=0x47b213
os.openFileNolog(0xc000110080, 0x14, 0x40, 0x180, 0x2, 0xc000110080, 0x14)
        C:/Go/src/os/file_windows.go:158 +0x141 fp=0xc000097dc8 sp=0xc000097d70 pc=0x47b8b1
os.OpenFile(0xc000110080, 0x14, 0x40, 0x180, 0x5, 0xc000110080, 0x14)
        C:/Go/src/os/file.go:284 +0x66 fp=0xc000097e10 sp=0xc000097dc8 pc=0x47aa56
github.com/etcd-io/bbolt.flock(0xc00010e1e0, 0x100000180, 0x0, 0x180, 0xc000152008)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:55 +0x8d fp=0xc000097e88 sp=0xc000097e10 pc=0x4a4c3d
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc000097f48 sp=0xc000097e88 pc=0x4a8a78
main.opener(0x1, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc000097fd0 sp=0xc000097f48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc000097fd8 sp=0xc000097fd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 22 [runnable, locked to thread]:
runtime.cgocall(0x453b00, 0xc0001222c8, 0x463e42)
        C:/Go/src/runtime/cgocall.go:128 +0x55 fp=0xc000093bf8 sp=0xc000093bc0 pc=0x403645
syscall.Syscall9(0x7ff8acea1d30, 0x7, 0xc00013e030, 0xc0000000, 0x3, 0x0, 0x4, 0x80, 0x0, 0x0, ...)
        C:/Go/src/runtime/syscall_windows.go:198 +0x102 fp=0xc000093c28 sp=0xc000093bf8 pc=0x443712
syscall.CreateFile(0xc00013e030, 0x3c0000000, 0x0, 0x8000000004, 0x0, 0xc000093d28, 0x43f486, 0x14)
        C:/Go/src/syscall/zsyscall_windows.go:295 +0xd8 fp=0xc000093cc0 sp=0xc000093c28 pc=0x465648
syscall.Open(0xc0000f00a0, 0x14, 0x80040, 0x180, 0x5, 0x14, 0xc0000f00a0)
        C:/Go/src/syscall/syscall_windows.go:289 +0x112 fp=0xc000093d28 sp=0xc000093cc0 pc=0x464b42
os.openFile(0xc0000f00a0, 0x14, 0x40, 0x180, 0x1, 0xc0000f00a0, 0xc0000f00af)
        C:/Go/src/os/file_windows.go:97 +0xa3 fp=0xc000093d70 sp=0xc000093d28 pc=0x47b213
os.openFileNolog(0xc0000f00a0, 0x14, 0x40, 0x180, 0x2, 0xc0000f00a0, 0x14)
        C:/Go/src/os/file_windows.go:158 +0x141 fp=0xc000093dc8 sp=0xc000093d70 pc=0x47b8b1
os.OpenFile(0xc0000f00a0, 0x14, 0x40, 0x180, 0x5, 0xc0000f00a0, 0x14)
        C:/Go/src/os/file.go:284 +0x66 fp=0xc000093e10 sp=0xc000093dc8 pc=0x47aa56
github.com/etcd-io/bbolt.flock(0xc0000ac1e0, 0x100000180, 0x0, 0x180, 0xc00013a008)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:55 +0x8d fp=0xc000093e88 sp=0xc000093e10 pc=0x4a4c3d
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc000093f48 sp=0xc000093e88 pc=0x4a8a78
main.opener(0x3, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc000093fd0 sp=0xc000093f48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc000093fd8 sp=0xc000093fd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 24 [runnable, locked to thread]:
runtime.cgocall(0x453b00, 0xc000122648, 0x463e42)
        C:/Go/src/runtime/cgocall.go:128 +0x55 fp=0xc0000a1bf8 sp=0xc0000a1bc0 pc=0x403645
syscall.Syscall9(0x7ff8acea1d30, 0x7, 0xc000166030, 0xc0000000, 0x3, 0x0, 0x4, 0x80, 0x0, 0x0, ...)
        C:/Go/src/runtime/syscall_windows.go:198 +0x102 fp=0xc0000a1c28 sp=0xc0000a1bf8 pc=0x443712
syscall.CreateFile(0xc000166030, 0x3c0000000, 0x0, 0x8000000004, 0x0, 0xc0000a1d28, 0x43f486, 0x14)
        C:/Go/src/syscall/zsyscall_windows.go:295 +0xd8 fp=0xc0000a1cc0 sp=0xc0000a1c28 pc=0x465648
syscall.Open(0xc00012c080, 0x14, 0x80040, 0x180, 0x5, 0x14, 0xc00012c080)
        C:/Go/src/syscall/syscall_windows.go:289 +0x112 fp=0xc0000a1d28 sp=0xc0000a1cc0 pc=0x464b42
os.openFile(0xc00012c080, 0x14, 0x40, 0x180, 0x1, 0xc00012c080, 0xc00012c08f)
        C:/Go/src/os/file_windows.go:97 +0xa3 fp=0xc0000a1d70 sp=0xc0000a1d28 pc=0x47b213
os.openFileNolog(0xc00012c080, 0x14, 0x40, 0x180, 0x2, 0xc00012c080, 0x14)
        C:/Go/src/os/file_windows.go:158 +0x141 fp=0xc0000a1dc8 sp=0xc0000a1d70 pc=0x47b8b1
os.OpenFile(0xc00012c080, 0x14, 0x40, 0x180, 0x5, 0xc00012c080, 0x14)
        C:/Go/src/os/file.go:284 +0x66 fp=0xc0000a1e10 sp=0xc0000a1dc8 pc=0x47aa56
github.com/etcd-io/bbolt.flock(0xc00012a1e0, 0x100000180, 0x0, 0x180, 0xc000162008)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:55 +0x8d fp=0xc0000a1e88 sp=0xc0000a1e10 pc=0x4a4c3d
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc0000a1f48 sp=0xc0000a1e88 pc=0x4a8a78
main.opener(0x5, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc0000a1fd0 sp=0xc0000a1f48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000a1fd8 sp=0xc0000a1fd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 25 [runnable, locked to thread]:
runtime.cgocall(0x453b00, 0xc0001069c8, 0x463e42)
        C:/Go/src/runtime/cgocall.go:128 +0x55 fp=0xc00009bbf8 sp=0xc00009bbc0 pc=0x403645
syscall.Syscall9(0x7ff8acea1d30, 0x7, 0xc000156060, 0xc0000000, 0x3, 0x0, 0x4, 0x80, 0x0, 0x0, ...)
        C:/Go/src/runtime/syscall_windows.go:198 +0x102 fp=0xc00009bc28 sp=0xc00009bbf8 pc=0x443712
syscall.CreateFile(0xc000156060, 0x3c0000000, 0x0, 0x8000000004, 0x0, 0xc00009bd28, 0x43f486, 0x14)
        C:/Go/src/syscall/zsyscall_windows.go:295 +0xd8 fp=0xc00009bcc0 sp=0xc00009bc28 pc=0x465648
syscall.Open(0xc0001100a0, 0x14, 0x80040, 0x180, 0x5, 0x14, 0xc0001100a0)
        C:/Go/src/syscall/syscall_windows.go:289 +0x112 fp=0xc00009bd28 sp=0xc00009bcc0 pc=0x464b42
os.openFile(0xc0001100a0, 0x14, 0x40, 0x180, 0x1, 0xc0001100a0, 0xc0001100af)
        C:/Go/src/os/file_windows.go:97 +0xa3 fp=0xc00009bd70 sp=0xc00009bd28 pc=0x47b213
os.openFileNolog(0xc0001100a0, 0x14, 0x40, 0x180, 0x2, 0xc0001100a0, 0x14)
        C:/Go/src/os/file_windows.go:158 +0x141 fp=0xc00009bdc8 sp=0xc00009bd70 pc=0x47b8b1
os.OpenFile(0xc0001100a0, 0x14, 0x40, 0x180, 0x5, 0xc0001100a0, 0x14)
        C:/Go/src/os/file.go:284 +0x66 fp=0xc00009be10 sp=0xc00009bdc8 pc=0x47aa56
github.com/etcd-io/bbolt.flock(0xc00010e3c0, 0x100000180, 0x0, 0x180, 0xc000152010)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:55 +0x8d fp=0xc00009be88 sp=0xc00009be10 pc=0x4a4c3d
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc00009bf48 sp=0xc00009be88 pc=0x4a8a78
main.opener(0x6, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc00009bfd0 sp=0xc00009bf48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc00009bfd8 sp=0xc00009bfd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 26 [sleep]:
runtime.gopark(0x4fab80, 0x5ad040, 0x1312, 0x2)
        C:/Go/src/runtime/proc.go:302 +0x100 fp=0xc00009dd98 sp=0xc00009dd78 pc=0x42c260
runtime.goparkunlock(0x5ad040, 0xc000121312, 0x2)
        C:/Go/src/runtime/proc.go:308 +0x5a fp=0xc00009ddc8 sp=0xc00009dd98 pc=0x42c31a
time.Sleep(0x2faf080)
        C:/Go/src/runtime/time.go:105 +0x164 fp=0xc00009de10 sp=0xc00009ddc8 pc=0x443b94
github.com/etcd-io/bbolt.flock(0xc00012a000, 0x100000180, 0x0, 0x180, 0xc000162000)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:85 +0x127 fp=0xc00009de88 sp=0xc00009de10 pc=0x4a4cd7
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc00009df48 sp=0xc00009de88 pc=0x4a8a78
main.opener(0x7, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc00009dfd0 sp=0xc00009df48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc00009dfd8 sp=0xc00009dfd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 27 [runnable, locked to thread]:
runtime.cgocall(0x453b00, 0xc000114648, 0x463e42)
        C:/Go/src/runtime/cgocall.go:128 +0x55 fp=0xc0000a9bf8 sp=0xc0000a9bc0 pc=0x403645
syscall.Syscall9(0x7ff8acea1d30, 0x7, 0xc00015e030, 0xc0000000, 0x3, 0x0, 0x4, 0x80, 0x0, 0x0, ...)
        C:/Go/src/runtime/syscall_windows.go:198 +0x102 fp=0xc0000a9c28 sp=0xc0000a9bf8 pc=0x443712
syscall.CreateFile(0xc00015e030, 0x3c0000000, 0x0, 0x8000000004, 0x0, 0xc0000a9d28, 0x43f486, 0x14)
        C:/Go/src/syscall/zsyscall_windows.go:295 +0xd8 fp=0xc0000a9cc0 sp=0xc0000a9c28 pc=0x465648
syscall.Open(0xc00011e0a0, 0x14, 0x80040, 0x180, 0x5, 0x14, 0xc00011e0a0)
        C:/Go/src/syscall/syscall_windows.go:289 +0x112 fp=0xc0000a9d28 sp=0xc0000a9cc0 pc=0x464b42
os.openFile(0xc00011e0a0, 0x14, 0x40, 0x180, 0x1, 0xc00011e0a0, 0xc00011e0af)
        C:/Go/src/os/file_windows.go:97 +0xa3 fp=0xc0000a9d70 sp=0xc0000a9d28 pc=0x47b213
os.openFileNolog(0xc00011e0a0, 0x14, 0x40, 0x180, 0x2, 0xc00011e0a0, 0x14)
        C:/Go/src/os/file_windows.go:158 +0x141 fp=0xc0000a9dc8 sp=0xc0000a9d70 pc=0x47b8b1
os.OpenFile(0xc00011e0a0, 0x14, 0x40, 0x180, 0x5, 0xc00011e0a0, 0x14)
        C:/Go/src/os/file.go:284 +0x66 fp=0xc0000a9e10 sp=0xc0000a9dc8 pc=0x47aa56
github.com/etcd-io/bbolt.flock(0xc00011c1e0, 0x100000180, 0x0, 0x180, 0xc00015a008)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:55 +0x8d fp=0xc0000a9e88 sp=0xc0000a9e10 pc=0x4a4c3d
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc0000a9f48 sp=0xc0000a9e88 pc=0x4a8a78
main.opener(0x8, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc0000a9fd0 sp=0xc0000a9f48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000a9fd8 sp=0xc0000a9fd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 28 [runnable, locked to thread]:
runtime.cgocall(0x453b00, 0xc0001302c8, 0x463e42)
        C:/Go/src/runtime/cgocall.go:128 +0x55 fp=0xc0000abbf8 sp=0xc0000abbc0 pc=0x403645
syscall.Syscall9(0x7ff8acea1d30, 0x7, 0xc00013e060, 0xc0000000, 0x3, 0x0, 0x4, 0x80, 0x0, 0x0, ...)
        C:/Go/src/runtime/syscall_windows.go:198 +0x102 fp=0xc0000abc28 sp=0xc0000abbf8 pc=0x443712
syscall.CreateFile(0xc00013e060, 0x3c0000000, 0x0, 0x8000000004, 0x0, 0xc0000abd28, 0x43f486, 0x14)
        C:/Go/src/syscall/zsyscall_windows.go:295 +0xd8 fp=0xc0000abcc0 sp=0xc0000abc28 pc=0x465648
syscall.Open(0xc0000f00c0, 0x14, 0x80040, 0x180, 0x5, 0x14, 0xc0000f00c0)
        C:/Go/src/syscall/syscall_windows.go:289 +0x112 fp=0xc0000abd28 sp=0xc0000abcc0 pc=0x464b42
os.openFile(0xc0000f00c0, 0x14, 0x40, 0x180, 0x1, 0xc0000f00c0, 0xc0000f00cf)
        C:/Go/src/os/file_windows.go:97 +0xa3 fp=0xc0000abd70 sp=0xc0000abd28 pc=0x47b213
os.openFileNolog(0xc0000f00c0, 0x14, 0x40, 0x180, 0x2, 0xc0000f00c0, 0x14)
        C:/Go/src/os/file_windows.go:158 +0x141 fp=0xc0000abdc8 sp=0xc0000abd70 pc=0x47b8b1
os.OpenFile(0xc0000f00c0, 0x14, 0x40, 0x180, 0x5, 0xc0000f00c0, 0x14)
        C:/Go/src/os/file.go:284 +0x66 fp=0xc0000abe10 sp=0xc0000abdc8 pc=0x47aa56
github.com/etcd-io/bbolt.flock(0xc0000ac3c0, 0x100000180, 0x0, 0x180, 0xc00013a010)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:55 +0x8d fp=0xc0000abe88 sp=0xc0000abe10 pc=0x4a4c3d
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc0000abf48 sp=0xc0000abe88 pc=0x4a8a78
main.opener(0x9, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc0000abfd0 sp=0xc0000abf48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000abfd8 sp=0xc0000abfd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 29 [sleep]:
runtime.gopark(0x4fab80, 0x5acfc0, 0x1312, 0x2)
        C:/Go/src/runtime/proc.go:302 +0x100 fp=0xc0000a5d98 sp=0xc0000a5d78 pc=0x42c260
runtime.goparkunlock(0x5acfc0, 0xc000111312, 0x2)
        C:/Go/src/runtime/proc.go:308 +0x5a fp=0xc0000a5dc8 sp=0xc0000a5d98 pc=0x42c31a
time.Sleep(0x2faf080)
        C:/Go/src/runtime/time.go:105 +0x164 fp=0xc0000a5e10 sp=0xc0000a5dc8 pc=0x443b94
github.com/etcd-io/bbolt.flock(0xc00011c000, 0x100000180, 0x0, 0x180, 0xc00015a000)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:85 +0x127 fp=0xc0000a5e88 sp=0xc0000a5e10 pc=0x4a4cd7
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc0000a5f48 sp=0xc0000a5e88 pc=0x4a8a78
main.opener(0xa, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc0000a5fd0 sp=0xc0000a5f48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000a5fd8 sp=0xc0000a5fd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 31 [runnable, locked to thread]:
runtime.cgocall(0x453b00, 0xc0000e09c8, 0x463e42)
        C:/Go/src/runtime/cgocall.go:128 +0x55 fp=0xc0000b5bf8 sp=0xc0000b5bc0 pc=0x403645
syscall.Syscall9(0x7ff8acea1d30, 0x7, 0xc000146060, 0xc0000000, 0x3, 0x0, 0x4, 0x80, 0x0, 0x0, ...)
        C:/Go/src/runtime/syscall_windows.go:198 +0x102 fp=0xc0000b5c28 sp=0xc0000b5bf8 pc=0x443712
syscall.CreateFile(0xc000146060, 0x3c0000000, 0x0, 0x8000000004, 0x0, 0xc0000b5d28, 0x43f486, 0x14)
        C:/Go/src/syscall/zsyscall_windows.go:295 +0xd8 fp=0xc0000b5cc0 sp=0xc0000b5c28 pc=0x465648
syscall.Open(0xc0000f40c0, 0x14, 0x80040, 0x180, 0x5, 0x14, 0xc0000f40c0)
        C:/Go/src/syscall/syscall_windows.go:289 +0x112 fp=0xc0000b5d28 sp=0xc0000b5cc0 pc=0x464b42
os.openFile(0xc0000f40c0, 0x14, 0x40, 0x180, 0x1, 0xc0000f40c0, 0xc0000f40cf)
        C:/Go/src/os/file_windows.go:97 +0xa3 fp=0xc0000b5d70 sp=0xc0000b5d28 pc=0x47b213
os.openFileNolog(0xc0000f40c0, 0x14, 0x40, 0x180, 0x2, 0xc0000f40c0, 0x14)
        C:/Go/src/os/file_windows.go:158 +0x141 fp=0xc0000b5dc8 sp=0xc0000b5d70 pc=0x47b8b1
os.OpenFile(0xc0000f40c0, 0x14, 0x40, 0x180, 0x5, 0xc0000f40c0, 0x14)
        C:/Go/src/os/file.go:284 +0x66 fp=0xc0000b5e10 sp=0xc0000b5dc8 pc=0x47aa56
github.com/etcd-io/bbolt.flock(0xc0000e83c0, 0x100000180, 0x0, 0x180, 0xc000142010)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:55 +0x8d fp=0xc0000b5e88 sp=0xc0000b5e10 pc=0x4a4c3d
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc0000b5f48 sp=0xc0000b5e88 pc=0x4a8a78
main.opener(0xc, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc0000b5fd0 sp=0xc0000b5f48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000b5fd8 sp=0xc0000b5fd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 32 [runnable, locked to thread]:
runtime.cgocall(0x453b00, 0xc000042d48, 0x463e42)
        C:/Go/src/runtime/cgocall.go:128 +0x55 fp=0xc0000b7bf8 sp=0xc0000b7bc0 pc=0x403645
syscall.Syscall9(0x7ff8acea1d30, 0x7, 0xc00007e0f0, 0xc0000000, 0x3, 0x0, 0x4, 0x80, 0x0, 0x0, ...)
        C:/Go/src/runtime/syscall_windows.go:198 +0x102 fp=0xc0000b7c28 sp=0xc0000b7bf8 pc=0x443712
syscall.CreateFile(0xc00007e0f0, 0x3c0000000, 0x0, 0x8000000004, 0x0, 0xc0000b7d28, 0x43f486, 0x14)
        C:/Go/src/syscall/zsyscall_windows.go:295 +0xd8 fp=0xc0000b7cc0 sp=0xc0000b7c28 pc=0x465648
syscall.Open(0xc0000561a0, 0x14, 0x80040, 0x180, 0x5, 0x14, 0xc0000561a0)
        C:/Go/src/syscall/syscall_windows.go:289 +0x112 fp=0xc0000b7d28 sp=0xc0000b7cc0 pc=0x464b42
os.openFile(0xc0000561a0, 0x14, 0x40, 0x180, 0x1, 0xc0000561a0, 0xc0000561af)
        C:/Go/src/os/file_windows.go:97 +0xa3 fp=0xc0000b7d70 sp=0xc0000b7d28 pc=0x47b213
os.openFileNolog(0xc0000561a0, 0x14, 0x40, 0x180, 0x2, 0xc0000561a0, 0x14)
        C:/Go/src/os/file_windows.go:158 +0x141 fp=0xc0000b7dc8 sp=0xc0000b7d70 pc=0x47b8b1
os.OpenFile(0xc0000561a0, 0x14, 0x40, 0x180, 0x5, 0xc0000561a0, 0x14)
        C:/Go/src/os/file.go:284 +0x66 fp=0xc0000b7e10 sp=0xc0000b7dc8 pc=0x47aa56
github.com/etcd-io/bbolt.flock(0xc0000dc5a0, 0x100000180, 0x0, 0x180, 0xc000080030)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:55 +0x8d fp=0xc0000b7e88 sp=0xc0000b7e10 pc=0x4a4c3d
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc0000b7f48 sp=0xc0000b7e88 pc=0x4a8a78
main.opener(0xd, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc0000b7fd0 sp=0xc0000b7f48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000b7fd8 sp=0xc0000b7fd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 33 [runnable, locked to thread]:
runtime.cgocall(0x453b00, 0xc000130648, 0x463e42)
        C:/Go/src/runtime/cgocall.go:128 +0x55 fp=0xc0000b1bf8 sp=0xc0000b1bc0 pc=0x403645
syscall.Syscall9(0x7ff8acea1d30, 0x7, 0xc00013e090, 0xc0000000, 0x3, 0x0, 0x4, 0x80, 0x0, 0x0, ...)
        C:/Go/src/runtime/syscall_windows.go:198 +0x102 fp=0xc0000b1c28 sp=0xc0000b1bf8 pc=0x443712
syscall.CreateFile(0xc00013e090, 0x3c0000000, 0x0, 0x8000000004, 0x0, 0xc0000b1d28, 0x43f486, 0x14)
        C:/Go/src/syscall/zsyscall_windows.go:295 +0xd8 fp=0xc0000b1cc0 sp=0xc0000b1c28 pc=0x465648
syscall.Open(0xc0000f00e0, 0x14, 0x80040, 0x180, 0x5, 0x14, 0xc0000f00e0)
        C:/Go/src/syscall/syscall_windows.go:289 +0x112 fp=0xc0000b1d28 sp=0xc0000b1cc0 pc=0x464b42
os.openFile(0xc0000f00e0, 0x14, 0x40, 0x180, 0x1, 0xc0000f00e0, 0xc0000f00ef)
        C:/Go/src/os/file_windows.go:97 +0xa3 fp=0xc0000b1d70 sp=0xc0000b1d28 pc=0x47b213
os.openFileNolog(0xc0000f00e0, 0x14, 0x40, 0x180, 0x2, 0xc0000f00e0, 0x14)
        C:/Go/src/os/file_windows.go:158 +0x141 fp=0xc0000b1dc8 sp=0xc0000b1d70 pc=0x47b8b1
os.OpenFile(0xc0000f00e0, 0x14, 0x40, 0x180, 0x5, 0xc0000f00e0, 0x14)
        C:/Go/src/os/file.go:284 +0x66 fp=0xc0000b1e10 sp=0xc0000b1dc8 pc=0x47aa56
github.com/etcd-io/bbolt.flock(0xc0000ac5a0, 0x100000180, 0x0, 0x180, 0xc00013a018)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:55 +0x8d fp=0xc0000b1e88 sp=0xc0000b1e10 pc=0x4a4c3d
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc0000b1f48 sp=0xc0000b1e88 pc=0x4a8a78
main.opener(0xe, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc0000b1fd0 sp=0xc0000b1f48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000b1fd8 sp=0xc0000b1fd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 34 [runnable, locked to thread]:
runtime.cgocall(0x453b00, 0xc0000e0d48, 0x463e42)
        C:/Go/src/runtime/cgocall.go:128 +0x55 fp=0xc0000b3bf8 sp=0xc0000b3bc0 pc=0x403645
syscall.Syscall9(0x7ff8acea1d30, 0x7, 0xc000146090, 0xc0000000, 0x3, 0x0, 0x4, 0x80, 0x0, 0x0, ...)
        C:/Go/src/runtime/syscall_windows.go:198 +0x102 fp=0xc0000b3c28 sp=0xc0000b3bf8 pc=0x443712
syscall.CreateFile(0xc000146090, 0x3c0000000, 0x0, 0x8000000004, 0x0, 0xc0000b3d28, 0x43f486, 0x14)
        C:/Go/src/syscall/zsyscall_windows.go:295 +0xd8 fp=0xc0000b3cc0 sp=0xc0000b3c28 pc=0x465648
syscall.Open(0xc0000f40e0, 0x14, 0x80040, 0x180, 0x5, 0x14, 0xc0000f40e0)
        C:/Go/src/syscall/syscall_windows.go:289 +0x112 fp=0xc0000b3d28 sp=0xc0000b3cc0 pc=0x464b42
os.openFile(0xc0000f40e0, 0x14, 0x40, 0x180, 0x1, 0xc0000f40e0, 0xc0000f40ef)
        C:/Go/src/os/file_windows.go:97 +0xa3 fp=0xc0000b3d70 sp=0xc0000b3d28 pc=0x47b213
os.openFileNolog(0xc0000f40e0, 0x14, 0x40, 0x180, 0x2, 0xc0000f40e0, 0x14)
        C:/Go/src/os/file_windows.go:158 +0x141 fp=0xc0000b3dc8 sp=0xc0000b3d70 pc=0x47b8b1
os.OpenFile(0xc0000f40e0, 0x14, 0x40, 0x180, 0x5, 0xc0000f40e0, 0x14)
        C:/Go/src/os/file.go:284 +0x66 fp=0xc0000b3e10 sp=0xc0000b3dc8 pc=0x47aa56
github.com/etcd-io/bbolt.flock(0xc0000e85a0, 0x100000180, 0x0, 0x180, 0xc000142018)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:55 +0x8d fp=0xc0000b3e88 sp=0xc0000b3e10 pc=0x4a4c3d
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc0000b3f48 sp=0xc0000b3e88 pc=0x4a8a78
main.opener(0xf, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc0000b3fd0 sp=0xc0000b3f48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000b3fd8 sp=0xc0000b3fd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 35 [sleep]:
runtime.gopark(0x4fab80, 0x5ace40, 0x1312, 0x2)
        C:/Go/src/runtime/proc.go:302 +0x100 fp=0xc0000bdd98 sp=0xc0000bdd78 pc=0x42c260
runtime.goparkunlock(0x5ace40, 0xc0000e1312, 0x2)
        C:/Go/src/runtime/proc.go:308 +0x5a fp=0xc0000bddc8 sp=0xc0000bdd98 pc=0x42c31a
time.Sleep(0x2faf080)
        C:/Go/src/runtime/time.go:105 +0x164 fp=0xc0000bde10 sp=0xc0000bddc8 pc=0x443b94
github.com/etcd-io/bbolt.flock(0xc0000e8000, 0x100000180, 0x0, 0x180, 0xc000142000)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:85 +0x127 fp=0xc0000bde88 sp=0xc0000bde10 pc=0x4a4cd7
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc0000bdf48 sp=0xc0000bde88 pc=0x4a8a78
main.opener(0x10, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc0000bdfd0 sp=0xc0000bdf48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000bdfd8 sp=0xc0000bdfd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 36 [runnable, locked to thread]:
runtime.cgocall(0x453b00, 0xc0000ea648, 0x463e42)
        C:/Go/src/runtime/cgocall.go:128 +0x55 fp=0xc0000bfc80 sp=0xc0000bfc48 pc=0x403645
syscall.Syscall6(0x7ff8acea20b0, 0x5, 0x194, 0xc0001a8000, 0x1000, 0xc0000bfd7c, 0xc0000bfd80, 0x0, 0x0, 0x0, ...)
        C:/Go/src/runtime/syscall_windows.go:185 +0xfc fp=0xc0000bfcb0 sp=0xc0000bfc80 pc=0x4435bc
syscall.ReadFile(0x194, 0xc0001a8000, 0x1000, 0x1000, 0xc0000bfd7c, 0xc0000bfd80, 0x0, 0x70)
        C:/Go/src/syscall/zsyscall_windows.go:312 +0xd5 fp=0xc0000bfd38 sp=0xc0000bfcb0 pc=0x4657c5
internal/poll.(*FD).Pread(0xc00014c280, 0xc0001a8000, 0x1000, 0x1000, 0x0, 0x0, 0x0, 0x0)
        C:/Go/src/internal/poll/fd_windows.go:596 +0x1c9 fp=0xc0000bfdb8 sp=0xc0000bfd38 pc=0x4782d9
os.(*File).pread(0xc00014a008, 0xc0001a8000, 0x1000, 0x1000, 0x0, 0x194, 0xc0001a6000, 0x0)
        C:/Go/src/os/file_windows.go:216 +0x5f fp=0xc0000bfe08 sp=0xc0000bfdb8 pc=0x47be4f
os.(*File).ReadAt(0xc00014a008, 0xc0001a8000, 0x1000, 0x1000, 0x0, 0x0, 0x0, 0xc000047c80)
        C:/Go/src/os/file.go:126 +0x104 fp=0xc0000bfe88 sp=0xc0000bfe08 pc=0x479f74
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:237 +0x5c8 fp=0xc0000bff48 sp=0xc0000bfe88 pc=0x4a8ed8
main.opener(0x11, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc0000bffd0 sp=0xc0000bff48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000bffd8 sp=0xc0000bffd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 37 [runnable, locked to thread]:
runtime.cgocall(0x453b00, 0xc0000097c8, 0x463e42)
        C:/Go/src/runtime/cgocall.go:128 +0x55 fp=0xc0000b9bf8 sp=0xc0000b9bc0 pc=0x403645
syscall.Syscall9(0x7ff8acea1d30, 0x7, 0xc00000c2d0, 0xc0000000, 0x3, 0x0, 0x4, 0x80, 0x0, 0x0, ...)
        C:/Go/src/runtime/syscall_windows.go:198 +0x102 fp=0xc0000b9c28 sp=0xc0000b9bf8 pc=0x443712
syscall.CreateFile(0xc00000c2d0, 0x3c0000000, 0x0, 0x8000000004, 0x0, 0xc0000b9d28, 0x43f486, 0x14)
        C:/Go/src/syscall/zsyscall_windows.go:295 +0xd8 fp=0xc0000b9cc0 sp=0xc0000b9c28 pc=0x465648
syscall.Open(0xc000010360, 0x14, 0x80040, 0x180, 0x5, 0x14, 0xc000010360)
        C:/Go/src/syscall/syscall_windows.go:289 +0x112 fp=0xc0000b9d28 sp=0xc0000b9cc0 pc=0x464b42
os.openFile(0xc000010360, 0x14, 0x40, 0x180, 0x1, 0xc000010360, 0xc00001036f)
        C:/Go/src/os/file_windows.go:97 +0xa3 fp=0xc0000b9d70 sp=0xc0000b9d28 pc=0x47b213
os.openFileNolog(0xc000010360, 0x14, 0x40, 0x180, 0x2, 0xc000010360, 0x14)
        C:/Go/src/os/file_windows.go:158 +0x141 fp=0xc0000b9dc8 sp=0xc0000b9d70 pc=0x47b8b1
os.OpenFile(0xc000010360, 0x14, 0x40, 0x180, 0x5, 0xc000010360, 0x14)
        C:/Go/src/os/file.go:284 +0x66 fp=0xc0000b9e10 sp=0xc0000b9dc8 pc=0x47aa56
github.com/etcd-io/bbolt.flock(0xc0000de3c0, 0x100000180, 0x0, 0x180, 0xc000006020)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:55 +0x8d fp=0xc0000b9e88 sp=0xc0000b9e10 pc=0x4a4c3d
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc0000b9f48 sp=0xc0000b9e88 pc=0x4a8a78
main.opener(0x12, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc0000b9fd0 sp=0xc0000b9f48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000b9fd8 sp=0xc0000b9fd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 38 [runnable, locked to thread]:
runtime.cgocall(0x453b00, 0xc000009448, 0x463e42)
        C:/Go/src/runtime/cgocall.go:128 +0x55 fp=0xc0000bbbf8 sp=0xc0000bbbc0 pc=0x403645
syscall.Syscall9(0x7ff8acea1d30, 0x7, 0xc00000c2a0, 0xc0000000, 0x3, 0x0, 0x4, 0x80, 0x0, 0x0, ...)
        C:/Go/src/runtime/syscall_windows.go:198 +0x102 fp=0xc0000bbc28 sp=0xc0000bbbf8 pc=0x443712
syscall.CreateFile(0xc00000c2a0, 0x3c0000000, 0x0, 0x8000000004, 0x0, 0xc0000bbd28, 0x43f486, 0x14)
        C:/Go/src/syscall/zsyscall_windows.go:295 +0xd8 fp=0xc0000bbcc0 sp=0xc0000bbc28 pc=0x465648
syscall.Open(0xc000010340, 0x14, 0x80040, 0x180, 0x5, 0x14, 0xc000010340)
        C:/Go/src/syscall/syscall_windows.go:289 +0x112 fp=0xc0000bbd28 sp=0xc0000bbcc0 pc=0x464b42
os.openFile(0xc000010340, 0x14, 0x40, 0x180, 0x1, 0xc000010340, 0xc00001034f)
        C:/Go/src/os/file_windows.go:97 +0xa3 fp=0xc0000bbd70 sp=0xc0000bbd28 pc=0x47b213
os.openFileNolog(0xc000010340, 0x14, 0x40, 0x180, 0x2, 0xc000010340, 0x14)
        C:/Go/src/os/file_windows.go:158 +0x141 fp=0xc0000bbdc8 sp=0xc0000bbd70 pc=0x47b8b1
os.OpenFile(0xc000010340, 0x14, 0x40, 0x180, 0x5, 0xc000010340, 0x14)
        C:/Go/src/os/file.go:284 +0x66 fp=0xc0000bbe10 sp=0xc0000bbdc8 pc=0x47aa56
github.com/etcd-io/bbolt.flock(0xc0000de1e0, 0x100000180, 0x0, 0x180, 0xc000006018)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:55 +0x8d fp=0xc0000bbe88 sp=0xc0000bbe10 pc=0x4a4c3d
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc0000bbf48 sp=0xc0000bbe88 pc=0x4a8a78
main.opener(0x13, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc0000bbfd0 sp=0xc0000bbf48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000bbfd8 sp=0xc0000bbfd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 39 [runnable, locked to thread]:
runtime.cgocall(0x453b00, 0xc0000ea9c8, 0x463e42)
        C:/Go/src/runtime/cgocall.go:128 +0x55 fp=0xc0000c7bf8 sp=0xc0000c7bc0 pc=0x403645
syscall.Syscall9(0x7ff8acea1d30, 0x7, 0xc00014e060, 0xc0000000, 0x3, 0x0, 0x4, 0x80, 0x0, 0x0, ...)
        C:/Go/src/runtime/syscall_windows.go:198 +0x102 fp=0xc0000c7c28 sp=0xc0000c7bf8 pc=0x443712
syscall.CreateFile(0xc00014e060, 0x3c0000000, 0x0, 0x8000000004, 0x0, 0xc0000c7d28, 0x43f486, 0x14)
        C:/Go/src/syscall/zsyscall_windows.go:295 +0xd8 fp=0xc0000c7cc0 sp=0xc0000c7c28 pc=0x465648
syscall.Open(0xc0001020c0, 0x14, 0x80040, 0x180, 0x5, 0x14, 0xc0001020c0)
        C:/Go/src/syscall/syscall_windows.go:289 +0x112 fp=0xc0000c7d28 sp=0xc0000c7cc0 pc=0x464b42
os.openFile(0xc0001020c0, 0x14, 0x40, 0x180, 0x1, 0xc0001020c0, 0xc0001020cf)
        C:/Go/src/os/file_windows.go:97 +0xa3 fp=0xc0000c7d70 sp=0xc0000c7d28 pc=0x47b213
os.openFileNolog(0xc0001020c0, 0x14, 0x40, 0x180, 0x2, 0xc0001020c0, 0x14)
        C:/Go/src/os/file_windows.go:158 +0x141 fp=0xc0000c7dc8 sp=0xc0000c7d70 pc=0x47b8b1
os.OpenFile(0xc0001020c0, 0x14, 0x40, 0x180, 0x5, 0xc0001020c0, 0x14)
        C:/Go/src/os/file.go:284 +0x66 fp=0xc0000c7e10 sp=0xc0000c7dc8 pc=0x47aa56
github.com/etcd-io/bbolt.flock(0xc0001003c0, 0x100000180, 0x0, 0x180, 0xc00014a010)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:55 +0x8d fp=0xc0000c7e88 sp=0xc0000c7e10 pc=0x4a4c3d
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc0000c7f48 sp=0xc0000c7e88 pc=0x4a8a78
main.opener(0x14, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc0000c7fd0 sp=0xc0000c7f48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000c7fd8 sp=0xc0000c7fd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 40 [runnable, locked to thread]:
runtime.cgocall(0x453b00, 0xc0000ead48, 0x463e42)
        C:/Go/src/runtime/cgocall.go:128 +0x55 fp=0xc0000c9bf8 sp=0xc0000c9bc0 pc=0x403645
syscall.Syscall9(0x7ff8acea1d30, 0x7, 0xc00014e090, 0xc0000000, 0x3, 0x0, 0x4, 0x80, 0x0, 0x0, ...)
        C:/Go/src/runtime/syscall_windows.go:198 +0x102 fp=0xc0000c9c28 sp=0xc0000c9bf8 pc=0x443712
syscall.CreateFile(0xc00014e090, 0x3c0000000, 0x0, 0x8000000004, 0x0, 0xc0000c9d28, 0x43f486, 0x14)
        C:/Go/src/syscall/zsyscall_windows.go:295 +0xd8 fp=0xc0000c9cc0 sp=0xc0000c9c28 pc=0x465648
syscall.Open(0xc0001020e0, 0x14, 0x80040, 0x180, 0x5, 0x14, 0xc0001020e0)
        C:/Go/src/syscall/syscall_windows.go:289 +0x112 fp=0xc0000c9d28 sp=0xc0000c9cc0 pc=0x464b42
os.openFile(0xc0001020e0, 0x14, 0x40, 0x180, 0x1, 0xc0001020e0, 0xc0001020ef)
        C:/Go/src/os/file_windows.go:97 +0xa3 fp=0xc0000c9d70 sp=0xc0000c9d28 pc=0x47b213
os.openFileNolog(0xc0001020e0, 0x14, 0x40, 0x180, 0x2, 0xc0001020e0, 0x14)
        C:/Go/src/os/file_windows.go:158 +0x141 fp=0xc0000c9dc8 sp=0xc0000c9d70 pc=0x47b8b1
os.OpenFile(0xc0001020e0, 0x14, 0x40, 0x180, 0x5, 0xc0001020e0, 0x14)
        C:/Go/src/os/file.go:284 +0x66 fp=0xc0000c9e10 sp=0xc0000c9dc8 pc=0x47aa56
github.com/etcd-io/bbolt.flock(0xc0001005a0, 0x100000180, 0x0, 0x180, 0xc00014a018)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:55 +0x8d fp=0xc0000c9e88 sp=0xc0000c9e10 pc=0x4a4c3d
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc0000c9f48 sp=0xc0000c9e88 pc=0x4a8a78
main.opener(0x15, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc0000c9fd0 sp=0xc0000c9f48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000c9fd8 sp=0xc0000c9fd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 42 [runnable, locked to thread]:
runtime.cgocall(0x453b00, 0xc000042648, 0x463e42)
        C:/Go/src/runtime/cgocall.go:128 +0x55 fp=0xc0000c5bf8 sp=0xc0000c5bc0 pc=0x403645
syscall.Syscall9(0x7ff8acea1d30, 0x7, 0xc00007e090, 0xc0000000, 0x3, 0x0, 0x4, 0x80, 0x0, 0x0, ...)
        C:/Go/src/runtime/syscall_windows.go:198 +0x102 fp=0xc0000c5c28 sp=0xc0000c5bf8 pc=0x443712
syscall.CreateFile(0xc00007e090, 0x3c0000000, 0x0, 0x8000000004, 0x0, 0xc0000c5d28, 0x43f486, 0x14)
        C:/Go/src/syscall/zsyscall_windows.go:295 +0xd8 fp=0xc0000c5cc0 sp=0xc0000c5c28 pc=0x465648
syscall.Open(0xc000056160, 0x14, 0x80040, 0x180, 0x5, 0x14, 0xc000056160)
        C:/Go/src/syscall/syscall_windows.go:289 +0x112 fp=0xc0000c5d28 sp=0xc0000c5cc0 pc=0x464b42
os.openFile(0xc000056160, 0x14, 0x40, 0x180, 0x1, 0xc000056160, 0xc00005616f)
        C:/Go/src/os/file_windows.go:97 +0xa3 fp=0xc0000c5d70 sp=0xc0000c5d28 pc=0x47b213
os.openFileNolog(0xc000056160, 0x14, 0x40, 0x180, 0x2, 0xc000056160, 0x14)
        C:/Go/src/os/file_windows.go:158 +0x141 fp=0xc0000c5dc8 sp=0xc0000c5d70 pc=0x47b8b1
os.OpenFile(0xc000056160, 0x14, 0x40, 0x180, 0x5, 0xc000056160, 0x14)
        C:/Go/src/os/file.go:284 +0x66 fp=0xc0000c5e10 sp=0xc0000c5dc8 pc=0x47aa56
github.com/etcd-io/bbolt.flock(0xc0000dc1e0, 0x100000180, 0x0, 0x180, 0xc000080020)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:55 +0x8d fp=0xc0000c5e88 sp=0xc0000c5e10 pc=0x4a4c3d
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc0000c5f48 sp=0xc0000c5e88 pc=0x4a8a78
main.opener(0x17, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc0000c5fd0 sp=0xc0000c5f48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000c5fd8 sp=0xc0000c5fd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 43 [runnable, locked to thread]:
runtime.cgocall(0x453b00, 0xc000114d48, 0x463e42)
        C:/Go/src/runtime/cgocall.go:128 +0x55 fp=0xc0000cfbf8 sp=0xc0000cfbc0 pc=0x403645
syscall.Syscall9(0x7ff8acea1d30, 0x7, 0xc00015e090, 0xc0000000, 0x3, 0x0, 0x4, 0x80, 0x0, 0x0, ...)
        C:/Go/src/runtime/syscall_windows.go:198 +0x102 fp=0xc0000cfc28 sp=0xc0000cfbf8 pc=0x443712
syscall.CreateFile(0xc00015e090, 0x3c0000000, 0x0, 0x8000000004, 0x0, 0xc0000cfd28, 0x43f486, 0x14)
        C:/Go/src/syscall/zsyscall_windows.go:295 +0xd8 fp=0xc0000cfcc0 sp=0xc0000cfc28 pc=0x465648
syscall.Open(0xc00011e0e0, 0x14, 0x80040, 0x180, 0x5, 0x14, 0xc00011e0e0)
        C:/Go/src/syscall/syscall_windows.go:289 +0x112 fp=0xc0000cfd28 sp=0xc0000cfcc0 pc=0x464b42
os.openFile(0xc00011e0e0, 0x14, 0x40, 0x180, 0x1, 0xc00011e0e0, 0xc00011e0ef)
        C:/Go/src/os/file_windows.go:97 +0xa3 fp=0xc0000cfd70 sp=0xc0000cfd28 pc=0x47b213
os.openFileNolog(0xc00011e0e0, 0x14, 0x40, 0x180, 0x2, 0xc00011e0e0, 0x14)
        C:/Go/src/os/file_windows.go:158 +0x141 fp=0xc0000cfdc8 sp=0xc0000cfd70 pc=0x47b8b1
os.OpenFile(0xc00011e0e0, 0x14, 0x40, 0x180, 0x5, 0xc00011e0e0, 0x14)
        C:/Go/src/os/file.go:284 +0x66 fp=0xc0000cfe10 sp=0xc0000cfdc8 pc=0x47aa56
github.com/etcd-io/bbolt.flock(0xc00011c5a0, 0x100000180, 0x0, 0x180, 0xc00015a018)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:55 +0x8d fp=0xc0000cfe88 sp=0xc0000cfe10 pc=0x4a4c3d
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc0000cff48 sp=0xc0000cfe88 pc=0x4a8a78
main.opener(0x18, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc0000cffd0 sp=0xc0000cff48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000cffd8 sp=0xc0000cffd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 44 [runnable, locked to thread]:
runtime.cgocall(0x453b00, 0xc000009b48, 0x463e42)
        C:/Go/src/runtime/cgocall.go:128 +0x55 fp=0xc0000d1bf8 sp=0xc0000d1bc0 pc=0x403645
syscall.Syscall9(0x7ff8acea1d30, 0x7, 0xc00000c300, 0xc0000000, 0x3, 0x0, 0x4, 0x80, 0x0, 0x0, ...)
        C:/Go/src/runtime/syscall_windows.go:198 +0x102 fp=0xc0000d1c28 sp=0xc0000d1bf8 pc=0x443712
syscall.CreateFile(0xc00000c300, 0x3c0000000, 0x0, 0x8000000004, 0x0, 0xc0000d1d28, 0x43f486, 0x14)
        C:/Go/src/syscall/zsyscall_windows.go:295 +0xd8 fp=0xc0000d1cc0 sp=0xc0000d1c28 pc=0x465648
syscall.Open(0xc000010380, 0x14, 0x80040, 0x180, 0x5, 0x14, 0xc000010380)
        C:/Go/src/syscall/syscall_windows.go:289 +0x112 fp=0xc0000d1d28 sp=0xc0000d1cc0 pc=0x464b42
os.openFile(0xc000010380, 0x14, 0x40, 0x180, 0x1, 0xc000010380, 0xc00001038f)
        C:/Go/src/os/file_windows.go:97 +0xa3 fp=0xc0000d1d70 sp=0xc0000d1d28 pc=0x47b213
os.openFileNolog(0xc000010380, 0x14, 0x40, 0x180, 0x2, 0xc000010380, 0x14)
        C:/Go/src/os/file_windows.go:158 +0x141 fp=0xc0000d1dc8 sp=0xc0000d1d70 pc=0x47b8b1
os.OpenFile(0xc000010380, 0x14, 0x40, 0x180, 0x5, 0xc000010380, 0x14)
        C:/Go/src/os/file.go:284 +0x66 fp=0xc0000d1e10 sp=0xc0000d1dc8 pc=0x47aa56
github.com/etcd-io/bbolt.flock(0xc0000de5a0, 0x100000180, 0x0, 0x180, 0xc000006028)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:55 +0x8d fp=0xc0000d1e88 sp=0xc0000d1e10 pc=0x4a4c3d
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc0000d1f48 sp=0xc0000d1e88 pc=0x4a8a78
main.opener(0x19, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc0000d1fd0 sp=0xc0000d1f48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000d1fd8 sp=0xc0000d1fd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 45 [runnable, locked to thread]:
runtime.cgocall(0x453b00, 0xc0001149c8, 0x463e42)
        C:/Go/src/runtime/cgocall.go:128 +0x55 fp=0xc0000cbbf8 sp=0xc0000cbbc0 pc=0x403645
syscall.Syscall9(0x7ff8acea1d30, 0x7, 0xc00015e060, 0xc0000000, 0x3, 0x0, 0x4, 0x80, 0x0, 0x0, ...)
        C:/Go/src/runtime/syscall_windows.go:198 +0x102 fp=0xc0000cbc28 sp=0xc0000cbbf8 pc=0x443712
syscall.CreateFile(0xc00015e060, 0x3c0000000, 0x0, 0x8000000004, 0x0, 0xc0000cbd28, 0x43f486, 0x14)
        C:/Go/src/syscall/zsyscall_windows.go:295 +0xd8 fp=0xc0000cbcc0 sp=0xc0000cbc28 pc=0x465648
syscall.Open(0xc00011e0c0, 0x14, 0x80040, 0x180, 0x5, 0x14, 0xc00011e0c0)
        C:/Go/src/syscall/syscall_windows.go:289 +0x112 fp=0xc0000cbd28 sp=0xc0000cbcc0 pc=0x464b42
os.openFile(0xc00011e0c0, 0x14, 0x40, 0x180, 0x1, 0xc00011e0c0, 0xc00011e0cf)
        C:/Go/src/os/file_windows.go:97 +0xa3 fp=0xc0000cbd70 sp=0xc0000cbd28 pc=0x47b213
os.openFileNolog(0xc00011e0c0, 0x14, 0x40, 0x180, 0x2, 0xc00011e0c0, 0x14)
        C:/Go/src/os/file_windows.go:158 +0x141 fp=0xc0000cbdc8 sp=0xc0000cbd70 pc=0x47b8b1
os.OpenFile(0xc00011e0c0, 0x14, 0x40, 0x180, 0x5, 0xc00011e0c0, 0x14)
        C:/Go/src/os/file.go:284 +0x66 fp=0xc0000cbe10 sp=0xc0000cbdc8 pc=0x47aa56
github.com/etcd-io/bbolt.flock(0xc00011c3c0, 0x100000180, 0x0, 0x180, 0xc00015a010)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:55 +0x8d fp=0xc0000cbe88 sp=0xc0000cbe10 pc=0x4a4c3d
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc0000cbf48 sp=0xc0000cbe88 pc=0x4a8a78
main.opener(0x1a, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc0000cbfd0 sp=0xc0000cbf48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000cbfd8 sp=0xc0000cbfd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 46 [runnable, locked to thread]:
runtime.cgocall(0x453b00, 0xc0000429c8, 0x463e42)
        C:/Go/src/runtime/cgocall.go:128 +0x55 fp=0xc0000cdbf8 sp=0xc0000cdbc0 pc=0x403645
syscall.Syscall9(0x7ff8acea1d30, 0x7, 0xc00007e0c0, 0xc0000000, 0x3, 0x0, 0x4, 0x80, 0x0, 0x0, ...)
        C:/Go/src/runtime/syscall_windows.go:198 +0x102 fp=0xc0000cdc28 sp=0xc0000cdbf8 pc=0x443712
syscall.CreateFile(0xc00007e0c0, 0x3c0000000, 0x0, 0x8000000004, 0x0, 0xc0000cdd28, 0x43f486, 0x14)
        C:/Go/src/syscall/zsyscall_windows.go:295 +0xd8 fp=0xc0000cdcc0 sp=0xc0000cdc28 pc=0x465648
syscall.Open(0xc000056180, 0x14, 0x80040, 0x180, 0x5, 0x14, 0xc000056180)
        C:/Go/src/syscall/syscall_windows.go:289 +0x112 fp=0xc0000cdd28 sp=0xc0000cdcc0 pc=0x464b42
os.openFile(0xc000056180, 0x14, 0x40, 0x180, 0x1, 0xc000056180, 0xc00005618f)
        C:/Go/src/os/file_windows.go:97 +0xa3 fp=0xc0000cdd70 sp=0xc0000cdd28 pc=0x47b213
os.openFileNolog(0xc000056180, 0x14, 0x40, 0x180, 0x2, 0xc000056180, 0x14)
        C:/Go/src/os/file_windows.go:158 +0x141 fp=0xc0000cddc8 sp=0xc0000cdd70 pc=0x47b8b1
os.OpenFile(0xc000056180, 0x14, 0x40, 0x180, 0x5, 0xc000056180, 0x14)
        C:/Go/src/os/file.go:284 +0x66 fp=0xc0000cde10 sp=0xc0000cddc8 pc=0x47aa56
github.com/etcd-io/bbolt.flock(0xc0000dc3c0, 0x100000180, 0x0, 0x180, 0xc000080028)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:55 +0x8d fp=0xc0000cde88 sp=0xc0000cde10 pc=0x4a4c3d
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc0000cdf48 sp=0xc0000cde88 pc=0x4a8a78
main.opener(0x1b, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc0000cdfd0 sp=0xc0000cdf48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000cdfd8 sp=0xc0000cdfd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 47 [runnable, locked to thread]:
runtime.cgocall(0x453b00, 0xc0001229c8, 0x463e42)
        C:/Go/src/runtime/cgocall.go:128 +0x55 fp=0xc0000d9bf8 sp=0xc0000d9bc0 pc=0x403645
syscall.Syscall9(0x7ff8acea1d30, 0x7, 0xc000166060, 0xc0000000, 0x3, 0x0, 0x4, 0x80, 0x0, 0x0, ...)
        C:/Go/src/runtime/syscall_windows.go:198 +0x102 fp=0xc0000d9c28 sp=0xc0000d9bf8 pc=0x443712
syscall.CreateFile(0xc000166060, 0x3c0000000, 0x0, 0x8000000004, 0x0, 0xc0000d9d28, 0x43f486, 0x14)
        C:/Go/src/syscall/zsyscall_windows.go:295 +0xd8 fp=0xc0000d9cc0 sp=0xc0000d9c28 pc=0x465648
syscall.Open(0xc00012c0a0, 0x14, 0x80040, 0x180, 0x5, 0x14, 0xc00012c0a0)
        C:/Go/src/syscall/syscall_windows.go:289 +0x112 fp=0xc0000d9d28 sp=0xc0000d9cc0 pc=0x464b42
os.openFile(0xc00012c0a0, 0x14, 0x40, 0x180, 0x1, 0xc00012c0a0, 0xc00012c0af)
        C:/Go/src/os/file_windows.go:97 +0xa3 fp=0xc0000d9d70 sp=0xc0000d9d28 pc=0x47b213
os.openFileNolog(0xc00012c0a0, 0x14, 0x40, 0x180, 0x2, 0xc00012c0a0, 0x14)
        C:/Go/src/os/file_windows.go:158 +0x141 fp=0xc0000d9dc8 sp=0xc0000d9d70 pc=0x47b8b1
os.OpenFile(0xc00012c0a0, 0x14, 0x40, 0x180, 0x5, 0xc00012c0a0, 0x14)
        C:/Go/src/os/file.go:284 +0x66 fp=0xc0000d9e10 sp=0xc0000d9dc8 pc=0x47aa56
github.com/etcd-io/bbolt.flock(0xc00012a3c0, 0x100000180, 0x0, 0x180, 0xc000162010)
        e:/go/src/github.com/etcd-io/bbolt/bolt_windows.go:55 +0x8d fp=0xc0000d9e88 sp=0xc0000d9e10 pc=0x4a4c3d
github.com/etcd-io/bbolt.Open(0x4f32de, 0xf, 0xc000000180, 0x5c6740, 0x0, 0x0, 0x0)
        e:/go/src/github.com/etcd-io/bbolt/db.go:200 +0x168 fp=0xc0000d9f48 sp=0xc0000d9e88 pc=0x4a8a78
main.opener(0x1c, 0xc000058070)
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:25 +0x7e fp=0xc0000d9fd0 sp=0xc0000d9f48 pc=0x4b608e
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000d9fd8 sp=0xc0000d9fd0 pc=0x452301
created by main.main
        e:/go/src/github.com/etcd-io/bbolt/test/main.go:16 +0x89

goroutine 50 [runnable]:
runtime.notetsleepg(0x5ace60, 0x2ebfd28, 0x0)
        C:/Go/src/runtime/lock_sema.go:280 +0x52 fp=0xc0000d5f58 sp=0xc0000d5f18 pc=0x409a82
runtime.timerproc(0x5ace40)
        C:/Go/src/runtime/time.go:288 +0x31c fp=0xc0000d5fd8 sp=0xc0000d5f58 pc=0x44441c
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000d5fe0 sp=0xc0000d5fd8 pc=0x452301
created by runtime.(*timersBucket).addtimerLocked
        C:/Go/src/runtime/time.go:170 +0x11b

goroutine 66 [runnable]:
runtime.notetsleepg(0x5ad060, 0x2eb54cc, 0x0)
        C:/Go/src/runtime/lock_sema.go:280 +0x52 fp=0xc00018df58 sp=0xc00018df18 pc=0x409a82
runtime.timerproc(0x5ad040)
        C:/Go/src/runtime/time.go:288 +0x31c fp=0xc00018dfd8 sp=0xc00018df58 pc=0x44441c
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc00018dfe0 sp=0xc00018dfd8 pc=0x452301
created by runtime.(*timersBucket).addtimerLocked
        C:/Go/src/runtime/time.go:170 +0x11b

goroutine 82 [runnable]:
runtime.notetsleepg(0x5acfe0, 0x2faf080, 0x0)
        C:/Go/src/runtime/lock_sema.go:280 +0x52 fp=0xc000189f58 sp=0xc000189f18 pc=0x409a82
runtime.timerproc(0x5acfc0)
        C:/Go/src/runtime/time.go:288 +0x31c fp=0xc000189fd8 sp=0xc000189f58 pc=0x44441c
runtime.goexit()
        C:/Go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc000189fe0 sp=0xc000189fd8 pc=0x452301
created by runtime.(*timersBucket).addtimerLocked
        C:/Go/src/runtime/time.go:170 +0x11b
PS E:\go\src\github.com\etcd-io\bbolt\test>

The root cause of the issue is the way in which the database is locked, and there being a race condition between flock() and funlock() in bolt_windows.go. However, as I discovered, synchronising those two isn't quite sufficient to guarantee thread-safe access. There is a potentially better fix which removes the .lock file, being closer in implementation to the *NIX LOCK_EX/LOCK_SH. I'm validating it before submitting a PR.