parent: 16408:2be8c885acc8 tip
net: band-aid for windows network poller
$ go test os/exec
deadlocks with the following stacks
looks like a real deadlock between tls.Conn.Read and Close
SIGABRT: abort
PC=0x423cb1
runtime.futex()
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/sys_linux_amd64.s:266 +0x21
runtime.futexsleep(0x7e68d8, 0x0, 0xffffffffffffffff)
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/os_linux.c:58 +0x59
runtime.notesleep(0x7e68d8)
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/lock_futex.c:125 +0x69
sysmon()
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/proc.c:1995 +0x196
runtime.mstart()
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/proc.c:485 +0xd2
crosscall_amd64()
/usr/local/google/home/dvyukov/src/go4/src/pkg/crypto/dsa/dsa.go:0 +0xc
goroutine 1 [chan receive]:
runtime.park(0x40acf0, 0xc2000cbef0, 0x7e280a)
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/proc.c:1167 +0x64
runtime.chanrecv(0x5c5920, 0xc2000cbea0, 0x7ffff7f67ce0, 0x0, 0x0, ...)
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/chan.c:366 +0x566
runtime.chanrecv1()
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/chan.c:458 +0x38
testing.RunTests(0x6d4810, 0x7e0d20, 0xc, 0xc, 0x0, ...)
/usr/local/google/home/dvyukov/src/go4/src/pkg/testing/testing.go:427 +0x88e
testing.Main(0x6d4810, 0x7e0d20, 0xc, 0xc, 0x7e5240, ...)
/usr/local/google/home/dvyukov/src/go4/src/pkg/testing/testing.go:358 +0x8a
main.main()
os/exec/_test/_testmain.go:65 +0x9a
runtime.main()
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/proc.c:182 +0x92
runtime.goexit()
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/proc.c:1214
goroutine 2 [syscall]:
runtime.goexit()
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/proc.c:1214
goroutine 3 [syscall]:
runtime.entersyscallblock()
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/proc.c:1324 +0x16e
runtime.MHeap_Scavenger()
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/mheap.c:435 +0xee
runtime.goexit()
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/proc.c:1214
created by runtime.main
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/proc.c:165
goroutine 18 [semacquire]:
runtime.park(0x40acf0, 0x7f4720, 0x7db990)
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/proc.c:1167 +0x64
semacquireimpl(0xc2000c5298, 0x1)
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/zsema_linux_amd64.c:113 +0x116
sync.runtime_Semacquire(0xc2000c5298)
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/zsema_linux_amd64.c:165 +0x2e
sync.(*Mutex).Lock(0xc2000c5294)
/usr/local/google/home/dvyukov/src/go4/src/pkg/sync/mutex.go:66 +0xbb
crypto/tls.(*Conn).Close(0xc2000c5280, 0x0, 0x0)
/usr/local/google/home/dvyukov/src/go4/src/pkg/crypto/tls/conn.go:816 +0x4e
net/http/httptest.(*Server).CloseClientConnections(0xc2001c45a0)
/usr/local/google/home/dvyukov/src/go4/src/pkg/net/http/httptest/server.go:184 +0xa6
net/http/httptest.(*Server).Close(0xc2001c45a0)
/usr/local/google/home/dvyukov/src/go4/src/pkg/net/http/httptest/server.go:169 +0x4f
os/exec.TestExtraFiles(0xc2000fa1b0)
/usr/local/google/home/dvyukov/src/go4/src/pkg/os/exec/exec_test.go:268 +0xe52
testing.tRunner(0xc2000fa1b0, 0x7e0dc8)
/usr/local/google/home/dvyukov/src/go4/src/pkg/testing/testing.go:346 +0x8a
runtime.goexit()
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/proc.c:1214
created by testing.RunTests
/usr/local/google/home/dvyukov/src/go4/src/pkg/testing/testing.go:426 +0x86b
goroutine 16 [finalizer wait]:
runtime.park(0x0, 0x0, 0x7e306a)
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/proc.c:1167 +0x64
runfinq()
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/mgc0.c:2068 +0x6d
runtime.goexit()
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/proc.c:1214
created by runtime.gc
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/mgc0.c:1772
goroutine 21 [IO wait]:
runtime.park(0x40acf0, 0x7ffff7e46c88, 0x7e138f)
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/proc.c:1167 +0x64
netpollblock(0x7ffff7e46c80, 0x72)
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/znetpoll_linux_amd64.c:255 +0x9f
net.runtime_pollWait(0x7ffff7e46c80, 0x72, 0x0)
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/znetpoll_linux_amd64.c:118 +0x82
net.(*pollDesc).WaitRead(0xc2000fa500, 0xb, 0xc2000cf120)
/usr/local/google/home/dvyukov/src/go4/src/pkg/net/fd_poll_runtime.go:75 +0x31
net.(*netFD).Read(0xc2000fa480, 0xc20008ac00, 0x400, 0x400, 0x0, ...)
/usr/local/google/home/dvyukov/src/go4/src/pkg/net/fd_unix.go:192 +0x2b3
net.(*conn).Read(0xc200000ae0, 0xc20008ac00, 0x400, 0x400, 0x7fff00000002, ...)
/usr/local/google/home/dvyukov/src/go4/src/pkg/net/net.go:123 +0xc3
crypto/tls.(*block).readFromUntil(0xc2001ef3c0, 0xc2001ef3f0, 0xc200000ae0, 0x5,
0xc200000ae0, ...)
/usr/local/google/home/dvyukov/src/go4/src/pkg/crypto/tls/conn.go:401 +0xbd
crypto/tls.(*Conn).readRecord(0xc2000c5280, 0x16, 0x0, 0x4c78c3)
/usr/local/google/home/dvyukov/src/go4/src/pkg/crypto/tls/conn.go:481 +0xfa
crypto/tls.(*Conn).readHandshake(0xc2000c5280, 0x16, 0xc200000b74, 0x4, 0x0, ...)
/usr/local/google/home/dvyukov/src/go4/src/pkg/crypto/tls/conn.go:683 +0xac
crypto/tls.(*serverHandshakeState).doFullHandshake(0xc2001f4000, 0xc2001f4000, 0x0)
/usr/local/google/home/dvyukov/src/go4/src/pkg/crypto/tls/handshake_server.go:325 +0x78a
crypto/tls.(*Conn).serverHandshake(0xc2000c5280, 0x0, 0x0)
/usr/local/google/home/dvyukov/src/go4/src/pkg/crypto/tls/handshake_server.go:65 +0x21c
crypto/tls.(*Conn).Handshake(0xc2000c5280, 0x0, 0x0)
/usr/local/google/home/dvyukov/src/go4/src/pkg/crypto/tls/conn.go:844 +0xec
net/http.(*conn).serve(0xc2000fa510)
/usr/local/google/home/dvyukov/src/go4/src/pkg/net/http/server.go:912 +0x1c8
runtime.goexit()
/usr/local/google/home/dvyukov/src/go4/src/pkg/runtime/proc.c:1214
created by net/http.(*Server).Serve
/usr/local/google/home/dvyukov/src/go4/src/pkg/net/http/server.go:1439 +0x266
