os/signal: hang in TestTerminalSignal on `darwin`

[gopherbot]

#!watchflakes
post <- goos == "darwin" && pkg == "os/signal" && log ~ `test timed out` && log ~ `^\s+TestTerminalSignal\s+\(`

Issue created automatically to collect these failures.

Example (log):

SIGQUIT: quit
PC=0x7ff802ac934e m=0 sigcode=0

goroutine 0 gp=0xb34b560 m=0 mp=0xb34bd60 [idle]:
runtime.kevent(0x5, 0x0, 0x0, 0x7ff7b5e25bf8, 0x40, 0x7ff7b5e25bc8)
	/tmp/buildlet/go/src/runtime/sys_darwin.go:458 +0x2e fp=0x7ff7b5e25b70 sp=0x7ff7b5e25b50 pc=0xb132c0e
runtime.netpoll(0xc000014030?)
	/tmp/buildlet/go/src/runtime/netpoll_kqueue.go:141 +0xfd fp=0x7ff7b5e26410 sp=0x7ff7b5e25b70 pc=0xb10de9d
runtime.findRunnable()
	/tmp/buildlet/go/src/runtime/proc.go:3468 +0x8c5 fp=0x7ff7b5e26588 sp=0x7ff7b5e26410 pc=0xb119865
...
panic: test timed out after 3m0s
running tests:
	TestTerminalSignal (2m55s)

goroutine 396 gp=0xc000101180 m=6 mp=0xc00012a008 [running]:
panic({0x603baa0?, 0xc0002040a0?})
	/tmp/buildlet/go/src/runtime/panic.go:779 +0x158 fp=0xc0000f5f10 sp=0xc0000f5e60 pc=0x5f0f418
testing.(*M).startAlarm.func1()
	/tmp/buildlet/go/src/testing/testing.go:2366 +0x385 fp=0xc0000f5fe0 sp=0xc0000f5f10 pc=0x5facee5
runtime.goexit({})
...

goroutine 102 gp=0xc000007a40 m=nil [GC worker (idle), 2 minutes]:
runtime.gopark(0x11fc3520920?, 0x0?, 0x0?, 0x0?, 0x0?)
	/tmp/buildlet/go/src/runtime/proc.go:402 +0xce fp=0xc00020bf50 sp=0xc00020bf30 pc=0x5f12d8e
runtime.gcBgMarkWorker()
	/tmp/buildlet/go/src/runtime/mgc.go:1310 +0xe5 fp=0xc00020bfe0 sp=0xc00020bf50 pc=0x5ef42a5
runtime.goexit({})
	/tmp/buildlet/go/src/runtime/asm_amd64.s:1695 +0x1 fp=0xc00020bfe8 sp=0xc00020bfe0 pc=0x5f49681
created by runtime.gcBgMarkStartWorkers in goroutine 126
	/tmp/buildlet/go/src/runtime/mgc.go:1234 +0x1c

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "os/signal" && test == ""

2023-12-13 14:32 darwin-amd64-12_0 go@58c28ba2 os/signal (log)

SIGQUIT: quit
PC=0x7ff802ac934e m=0 sigcode=0

goroutine 0 gp=0xb34b560 m=0 mp=0xb34bd60 [idle]:
runtime.kevent(0x5, 0x0, 0x0, 0x7ff7b5e25bf8, 0x40, 0x7ff7b5e25bc8)
	/tmp/buildlet/go/src/runtime/sys_darwin.go:458 +0x2e fp=0x7ff7b5e25b70 sp=0x7ff7b5e25b50 pc=0xb132c0e
runtime.netpoll(0xc000014030?)
	/tmp/buildlet/go/src/runtime/netpoll_kqueue.go:141 +0xfd fp=0x7ff7b5e26410 sp=0x7ff7b5e25b70 pc=0xb10de9d
runtime.findRunnable()
	/tmp/buildlet/go/src/runtime/proc.go:3468 +0x8c5 fp=0x7ff7b5e26588 sp=0x7ff7b5e26410 pc=0xb119865
...
panic: test timed out after 3m0s
running tests:
	TestTerminalSignal (2m55s)

goroutine 396 gp=0xc000101180 m=6 mp=0xc00012a008 [running]:
panic({0x603baa0?, 0xc0002040a0?})
	/tmp/buildlet/go/src/runtime/panic.go:779 +0x158 fp=0xc0000f5f10 sp=0xc0000f5e60 pc=0x5f0f418
testing.(*M).startAlarm.func1()
	/tmp/buildlet/go/src/testing/testing.go:2366 +0x385 fp=0xc0000f5fe0 sp=0xc0000f5f10 pc=0x5facee5
runtime.goexit({})
...

goroutine 102 gp=0xc000007a40 m=nil [GC worker (idle), 2 minutes]:
runtime.gopark(0x11fc3520920?, 0x0?, 0x0?, 0x0?, 0x0?)
	/tmp/buildlet/go/src/runtime/proc.go:402 +0xce fp=0xc00020bf50 sp=0xc00020bf30 pc=0x5f12d8e
runtime.gcBgMarkWorker()
	/tmp/buildlet/go/src/runtime/mgc.go:1310 +0xe5 fp=0xc00020bfe0 sp=0xc00020bf50 pc=0x5ef42a5
runtime.goexit({})
	/tmp/buildlet/go/src/runtime/asm_amd64.s:1695 +0x1 fp=0xc00020bfe8 sp=0xc00020bfe0 pc=0x5f49681
created by runtime.gcBgMarkStartWorkers in goroutine 126
	/tmp/buildlet/go/src/runtime/mgc.go:1234 +0x1c

— watchflakes

[bcmills]

This may be another symptom of #63937, and/or a duplicate of #61595.

See also:

• os/signal: TestTerminalSignal failures with subprogram failed: exit status 1 after Waiting for exit... #61595
• cmd/exec: Wait hangs on DragonflyBSD if child has a PTY that has been written to #56132
• os/signal: TestTerminalSignal failures with subprogram failed: signal: killed #57418
• os/signal: TestTerminalSignal failures on Darwin builders #37329

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- goos == "darwin" && pkg == "os/signal" && log ~ `test timed out` && log ~ `^\s+TestTerminalSignal\s+\(`

2024-03-19 07:29 gotip-darwin-amd64_14 go@84960608 os/signal.TestTerminalSignal [ABORT] (log)

=== RUN   TestTerminalSignal
=== PAUSE TestTerminalSignal
=== CONT  TestTerminalSignal
    signal_cgo_test.go:199: Sending ^Z...
    signal_cgo_test.go:211: Sending SIGCONT...
    signal_cgo_test.go:224: Waiting for exit...
    exec.go:193: test timed out while running command: /Users/swarming/.swarming/w/ir/x/t/go-build3635438088/b1427/signal.test -test.run=^TestTerminalSignal$ -test.timeout=11m11.600184238s
SIGQUIT: quit
PC=0x7ff811dba706 m=0 sigcode=0

...
panic: test timed out after 9m0s
running tests:
	TestTerminalSignal (8m57s)

goroutine 418 gp=0xc0001ff180 m=4 mp=0xc000080008 [running]:
panic({0x3c68c80?, 0xc0000a2030?})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:778 +0x168 fp=0xc00007cf10 sp=0xc00007ce60 pc=0x3b3c968
testing.(*M).startAlarm.func1()
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:2366 +0x385 fp=0xc00007cfe0 sp=0xc00007cf10 pc=0x3bda3c5
runtime.goexit({})
...
runtime.gopark(0x21bcad625c46?, 0x1?, 0x12?, 0x44?, 0x0?)
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/proc.go:402 +0xce fp=0xc0001f6f38 sp=0xc0001f6f18 pc=0x3b4026e
runtime.gcBgMarkWorker(0xc0002167e0)
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mgc.go:1333 +0xe9 fp=0xc0001f6fc8 sp=0xc0001f6f38 pc=0x3b216c9
runtime.gcBgMarkStartWorkers.gowrap1()
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mgc.go:1249 +0x25 fp=0xc0001f6fe0 sp=0xc0001f6fc8 pc=0x3b215a5
runtime.goexit({})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_amd64.s:1695 +0x1 fp=0xc0001f6fe8 sp=0xc0001f6fe0 pc=0x3b76b41
created by runtime.gcBgMarkStartWorkers in goroutine 61
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mgc.go:1249 +0x105

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- goos == "darwin" && pkg == "os/signal" && log ~ `test timed out` && log ~ `^\s+TestTerminalSignal\s+\(`

2024-03-21 21:04 darwin-amd64-12_0 go@87056756 os/signal (log)

SIGQUIT: quit
PC=0x7ff803b0b34e m=0 sigcode=0

goroutine 0 gp=0xdaac760 m=0 mp=0xdaacf60 [idle]:
runtime.kevent(0x5, 0x0, 0x0, 0x7ff7b36c5be8, 0x40, 0x7ff7b36c5bb8)
	/tmp/buildlet/go/src/runtime/sys_darwin.go:458 +0x2e fp=0x7ff7b36c5b60 sp=0x7ff7b36c5b40 pc=0xd89318e
runtime.netpoll(0xc000014030?)
	/tmp/buildlet/go/src/runtime/netpoll_kqueue.go:141 +0xfd fp=0x7ff7b36c6400 sp=0x7ff7b36c5b60 pc=0xd86e33d
runtime.findRunnable()
	/tmp/buildlet/go/src/runtime/proc.go:3471 +0x8c5 fp=0x7ff7b36c6578 sp=0x7ff7b36c6400 pc=0xd879c65
...
panic: test timed out after 3m0s
running tests:
	TestTerminalSignal (2m55s)

goroutine 430 gp=0xc00011c700 m=4 mp=0xc000080008 [running]:
panic({0xad16ca0?, 0xc000190070?})
	/tmp/buildlet/go/src/runtime/panic.go:778 +0x168 fp=0xc00009ef10 sp=0xc00009ee60 pc=0xabea8a8
testing.(*M).startAlarm.func1()
	/tmp/buildlet/go/src/testing/testing.go:2411 +0x385 fp=0xc00009efe0 sp=0xc00009ef10 pc=0xac88525
runtime.goexit({})
...
runtime.chansend1(0xc000098f18?, 0xad45c68?)
	/tmp/buildlet/go/src/runtime/chan.go:146 +0x17 fp=0xc000098e88 sp=0xc000098e58 pc=0xabb8bb7
os/exec.(*Cmd).watchCtx(0xc0001f4160, 0xc0000223f0)
	/tmp/buildlet/go/src/os/exec/exec.go:848 +0x477 fp=0xc000098fc0 sp=0xc000098e88 pc=0xac90c17
os/exec.(*Cmd).Start.gowrap2()
	/tmp/buildlet/go/src/os/exec/exec.go:750 +0x25 fp=0xc000098fe0 sp=0xc000098fc0 pc=0xac90505
runtime.goexit({})
	/tmp/buildlet/go/src/runtime/asm_amd64.s:1695 +0x1 fp=0xc000098fe8 sp=0xc000098fe0 pc=0xac24a81
created by os/exec.(*Cmd).Start in goroutine 56
	/tmp/buildlet/go/src/os/exec/exec.go:750 +0x973

— watchflakes