flake: goroutine leaks in support/TestRun #1131
Description
I encountered a test failure locally which flagged two goroutines leaked. Seems to be from coder's tailscale fork.
goleak: Errors on successful test run: found unexpected goroutines:
[Goroutine 171589 in state syscall, with syscall.syscall on top of the stack:
syscall.syscall(0x1401b877598?, 0x100f37dfc?, 0x107d866c0?, 0x12ef15470?)
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/runtime/sys_darwin.go:27 +0x48
syscall.Close(0x1401b8775e8?)
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/syscall/zsyscall_darwin_arm64.go:545 +0x34
internal/poll.(*SysFile).destroy(...)
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/internal/poll/fd_unixjs.go:24
internal/poll.(*FD).destroy(0x1401c625d00)
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/internal/poll/fd_unix.go:82 +0x58
internal/poll.(*FD).decref(0x12ef15470?)
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/internal/poll/fd_mutex.go:213 +0x80
internal/poll.(*FD).Close(0x1401c625d00)
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/internal/poll/fd_unix.go:105 +0x48
net.(*netFD).Close(0x1401c625d00)
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/net/fd_posix.go:37 +0x40
net.socket({0x10592b1d8, 0x1401c273e30}, {0x1037b474c, 0x4}, 0x1e, 0x1, 0x1037b48b8?, 0x1, {0x10593dc30, 0x0}, ...)
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/net/sock_posix.go:71 +0x228
net.internetSocket({0x10592b1d8, 0x1401c273e30}, {0x1037b474c, 0x4}, {0x10593dc30, 0x0}, {0x10593dc30, 0x1401c6a6060}, 0x1, 0x0, ...)
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/net/ipsock_posix.go:167 +0xa4
net.(*sysDialer).doDialTCPProto(0x1401c6663c0, {0x10592b1d8, 0x1401c273e30}, 0x0, 0x1401c6a6060, 0x0)
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/net/tcpsock_posix.go:85 +0xac
net.(*sysDialer).doDialTCP(...)
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/net/tcpsock_posix.go:75
net.(*sysDialer).dialTCP(0x1401c6a6060?, {0x10592b1d8?, 0x1401c273e30?}, 0x1010e2d04?, 0x100ef73d0?)
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/net/tcpsock_posix.go:71 +0x70
net.(*sysDialer).dialSingle(0x1401c6663c0, {0x10592b1d8, 0x1401c273e30}, {0x105910388, 0x1401c6a6060})
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/net/dial.go:721 +0x304
net.(*sysDialer).dialSerial(0x1401c6663c0, {0x10592b1d8, 0x1401c273e30}, {0x1401c63c0a0?, 0x1, 0x1037b474c?})
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/net/dial.go:686 +0x1a0
net.(*sysDialer).dialParallel(0x107d36720?, {0x10592b1d8?, 0x1401c273e30?}, {0x1401c63c0a0?, 0x4?, 0x1037b474c?}, {0x0?, 0x1401c644fa6?, 0x6?})
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/net/dial.go:587 +0x298
net.(*Dialer).DialContext(0x1401b21d9e0, {0x10592b1d8, 0x1401c273e30}, {0x1037b474c, 0x4}, {0x1401c644fa6, 0x6})
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/net/dial.go:578 +0x548
tailscale.com/derp/derphttp.(*Client).dialContext(0x0?, {0x10592b1d8, 0x1401c273e30}, {0x1037b474c, 0x4}, {0x1401c644fa6, 0x6})
/Users/zach/go/pkg/mod/github.com/coder/tailscale@v1.1.1-0.20250829055706-6eafe0f9199e/derp/derphttp/derphttp_client.go:759 +0x94
tailscale.com/derp/derphttp.(*Client).dialNode.func1.1()
/Users/zach/go/pkg/mod/github.com/coder/tailscale@v1.1.1-0.20250829055706-6eafe0f9199e/derp/derphttp/derphttp_client.go:827 +0x2bc
created by tailscale.com/derp/derphttp.(*Client).dialNode.func1 in goroutine 171587
/Users/zach/go/pkg/mod/github.com/coder/tailscale@v1.1.1-0.20250829055706-6eafe0f9199e/derp/derphttp/derphttp_client.go:809 +0x108
Goroutine 171820 in state select, with net/http.(*persistConn).writeLoop on top of the stack:
net/http.(*persistConn).writeLoop(0x1401c1daa20)
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/net/http/transport.go:2593 +0x9c
created by net/http.(*Transport).dialConn in goroutine 171877
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/net/http/transport.go:1948 +0x120c
Goroutine 171819 in state IO wait, with internal/poll.runtime_pollWait on top of the stack:
internal/poll.runtime_pollWait(0x12ef14af8, 0x72)
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/runtime/netpoll.go:351 +0xa0
internal/poll.(*pollDesc).wait(0x1401ca87580?, 0x1401cbe2000?, 0x0)
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/internal/poll/fd_poll_runtime.go:84 +0x28
internal/poll.(*pollDesc).waitRead(...)
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/internal/poll/fd_poll_runtime.go:89
internal/poll.(*FD).Read(0x1401ca87580, {0x1401cbe2000, 0x1000, 0x1000})
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/internal/poll/fd_unix.go:165 +0x1fc
net.(*netFD).Read(0x1401ca87580, {0x1401cbe2000?, 0x14004a7fc88?, 0x100e8ae88?})
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/net/fd_posix.go:55 +0x28
net.(*conn).Read(0x1401bd14b50, {0x1401cbe2000?, 0x104a7fd28?, 0x12f7fa240?})
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/net/net.go:194 +0x34
net/http.(*persistConn).Read(0x1401c1daa20, {0x1401cbe2000?, 0x14004a7fd58?, 0x101227674?})
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/net/http/transport.go:2125 +0x4c
bufio.(*Reader).fill(0x1401c934660)
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/bufio/bufio.go:113 +0xf8
bufio.(*Reader).Peek(0x1401c934660, 0x1)
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/bufio/bufio.go:152 +0x60
net/http.(*persistConn).readLoop(0x1401c1daa20)
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/net/http/transport.go:2278 +0x12c
created by net/http.(*Transport).dialConn in goroutine 171877
/Users/zach/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.10.darwin-arm64/src/net/http/transport.go:1947 +0x11c4
]
It's reproducible locally for me with:
~/src/coder/support $ go test -count=100 -failfast -run=TestRun
I encountered this on commit a8f2a8a44d93c928ec82bb72dec09a5e4351e704 (main).