runtime/pprof: TestCPUProfileWithFork failures with stuck `writerDescriptor` goroutines

[gopherbot]

#!watchflakes
post <- goos == "darwin" && pkg == "runtime/pprof" && test == "TestCPUProfileWithFork" && `SIGQUIT: quit`

Issue created automatically to collect these failures.

Example (log):

SIGQUIT: quit
PC=0x7ff8061563ea m=1 sigcode=0

rax    0x104
rbx    0x70000a473000
rcx    0x70000a472c48
rdx    0x1a00
rdi    0xc000040380
rsi    0xa1c01000a1d00
rbp    0x70000a472cf0
...
	/tmp/buildlet/go/src/runtime/chan.go:107 +0xe5 fp=0xc0000b9a88 sp=0xc0000b9a48 pc=0x1055c85
os/exec.(*Cmd).Start(0xc00013e000)
	/tmp/buildlet/go/src/os/exec/exec.go:706 +0xa0f fp=0xc0000b9ce0 sp=0xc0000b9a88 pc=0x117696f
os/exec.(*Cmd).Run(0x0?)
	/tmp/buildlet/go/src/os/exec/exec.go:587 +0x27 fp=0xc0000b9d20 sp=0xc0000b9ce0 pc=0x1175ee7
os/exec.(*Cmd).CombinedOutput(0xc00013e000)
	/tmp/buildlet/go/src/os/exec/exec.go:1005 +0x1f7 fp=0xc0000b9d98 sp=0xc0000b9d20 pc=0x1178df7
runtime/pprof.TestCPUProfileWithFork(0xc000082820)
	/tmp/buildlet/go/src/runtime/pprof/pprof_test.go:687 +0x338 fp=0xc0000b9e98 sp=0xc0000b9d98 pc=0x12339b8
testing.tRunner(0xc000082820, 0x12b3970)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "runtime/pprof" && test == "TestCPUProfileWithFork"

2023-05-04 17:28 darwin-amd64-race go@60c724c5 runtime/pprof.TestCPUProfileWithFork (log)

SIGQUIT: quit
PC=0x7ff8061563ea m=1 sigcode=0

rax    0x104
rbx    0x70000a473000
rcx    0x70000a472c48
rdx    0x1a00
rdi    0xc000040380
rsi    0xa1c01000a1d00
rbp    0x70000a472cf0
...
	/tmp/buildlet/go/src/runtime/chan.go:107 +0xe5 fp=0xc0000b9a88 sp=0xc0000b9a48 pc=0x1055c85
os/exec.(*Cmd).Start(0xc00013e000)
	/tmp/buildlet/go/src/os/exec/exec.go:706 +0xa0f fp=0xc0000b9ce0 sp=0xc0000b9a88 pc=0x117696f
os/exec.(*Cmd).Run(0x0?)
	/tmp/buildlet/go/src/os/exec/exec.go:587 +0x27 fp=0xc0000b9d20 sp=0xc0000b9ce0 pc=0x1175ee7
os/exec.(*Cmd).CombinedOutput(0xc00013e000)
	/tmp/buildlet/go/src/os/exec/exec.go:1005 +0x1f7 fp=0xc0000b9d98 sp=0xc0000b9d20 pc=0x1178df7
runtime/pprof.TestCPUProfileWithFork(0xc000082820)
	/tmp/buildlet/go/src/runtime/pprof/pprof_test.go:687 +0x338 fp=0xc0000b9e98 sp=0xc0000b9d98 pc=0x12339b8
testing.tRunner(0xc000082820, 0x12b3970)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "runtime/pprof" && test == "TestCPUProfileWithFork"

2023-05-10 14:30 darwin-amd64-race go@8e8303e1 runtime/pprof.TestCPUProfileWithFork (log)

SIGQUIT: quit
PC=0x7ff81b1ed34e m=1 sigcode=0

rax    0x4
rbx    0x700007427628
rcx    0x700007427568
rdx    0x0
rdi    0x3
rsi    0x0
rbp    0x700007427570
...
	/tmp/buildlet/go/src/os/exec/exec.go:941 +0x349 fp=0xc00007bc18 sp=0xc00007bad0 pc=0x117c7c9
os/exec.(*Cmd).Wait(0xc0000006e0)
	/tmp/buildlet/go/src/os/exec/exec.go:908 +0x2d5 fp=0xc00007bce0 sp=0xc00007bc18 pc=0x117c275
os/exec.(*Cmd).Run(0x0?)
	/tmp/buildlet/go/src/os/exec/exec.go:590 +0x55 fp=0xc00007bd20 sp=0xc00007bce0 pc=0x117a175
os/exec.(*Cmd).CombinedOutput(0xc0000006e0)
	/tmp/buildlet/go/src/os/exec/exec.go:1005 +0x1f7 fp=0xc00007bd98 sp=0xc00007bd20 pc=0x117d057
runtime/pprof.TestCPUProfileWithFork(0xc000144000)
	/tmp/buildlet/go/src/runtime/pprof/pprof_test.go:687 +0x338 fp=0xc00007be98 sp=0xc00007bd98 pc=0x123a538
testing.tRunner(0xc000144000, 0x12bf8a0)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "runtime/pprof" && test == "TestCPUProfileWithFork"

2023-05-10 21:44 darwin-amd64-race go@3f9521b2 runtime/pprof.TestCPUProfileWithFork (log)

SIGQUIT: quit
PC=0x7ff807b492be m=1 sigcode=0

rax    0x4
rbx    0x0
rcx    0x70000f5f6da8
rdx    0x1
rdi    0x1403
rsi    0x0
rbp    0x70000f5f6de0
...
	/tmp/buildlet/go/src/os/exec/exec.go:941 +0x349 fp=0xc0000b7c18 sp=0xc0000b7ad0 pc=0x117c549
os/exec.(*Cmd).Wait(0xc000194000)
	/tmp/buildlet/go/src/os/exec/exec.go:908 +0x2d5 fp=0xc0000b7ce0 sp=0xc0000b7c18 pc=0x117bff5
os/exec.(*Cmd).Run(0xc0000e4160?)
	/tmp/buildlet/go/src/os/exec/exec.go:590 +0x55 fp=0xc0000b7d20 sp=0xc0000b7ce0 pc=0x1179ef5
os/exec.(*Cmd).CombinedOutput(0xc000194000)
	/tmp/buildlet/go/src/os/exec/exec.go:1005 +0x1f7 fp=0xc0000b7d98 sp=0xc0000b7d20 pc=0x117cdd7
runtime/pprof.TestCPUProfileWithFork(0xc000083860)
	/tmp/buildlet/go/src/runtime/pprof/pprof_test.go:687 +0x338 fp=0xc0000b7e98 sp=0xc0000b7d98 pc=0x123a2b8
testing.tRunner(0xc000083860, 0x12bf1a0)

— watchflakes

[mknyszek]

Darwin's fork is weird, so this might be related to that?

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "runtime/pprof" && test == "TestCPUProfileWithFork"

2023-05-23 17:16 darwin-amd64-race go@4e679e26 runtime/pprof.TestCPUProfileWithFork (log)

SIGQUIT: quit
PC=0x7ff81dd952be m=1 sigcode=0

rax    0x4
rbx    0x0
rcx    0x70000b58eda8
rdx    0x1
rdi    0x1403
rsi    0x0
rbp    0x70000b58ede0
...
	/tmp/buildlet/go/src/os/exec/exec.go:941 +0x349 fp=0xc0000b5c18 sp=0xc0000b5ad0 pc=0x117c4a9
os/exec.(*Cmd).Wait(0xc00005a2c0)
	/tmp/buildlet/go/src/os/exec/exec.go:908 +0x2da fp=0xc0000b5ce0 sp=0xc0000b5c18 pc=0x117bf5a
os/exec.(*Cmd).Run(0x0?)
	/tmp/buildlet/go/src/os/exec/exec.go:590 +0x55 fp=0xc0000b5d20 sp=0xc0000b5ce0 pc=0x1179e55
os/exec.(*Cmd).CombinedOutput(0xc00005a2c0)
	/tmp/buildlet/go/src/os/exec/exec.go:1005 +0x1f7 fp=0xc0000b5d98 sp=0xc0000b5d20 pc=0x117cd57
runtime/pprof.TestCPUProfileWithFork(0xc0000824e0)
	/tmp/buildlet/go/src/runtime/pprof/pprof_test.go:687 +0x33f fp=0xc0000b5e98 sp=0xc0000b5d98 pc=0x123ed9f
testing.tRunner(0xc0000824e0, 0x12bf0c8)

— watchflakes