panic: Watchdog goroutine is stuck (2)

panic: Watchdog goroutine is stuck (2)

Status: fixed on 2021/06/11 19:31
Reported-by: syzbot+9898c404fc85208cdcd0@syzkaller.appspotmail.com
Fix commit: 3fcbad509300 Fix lock ordering issue when enumerating cgroup tasks.
First crash: 1276d, last: 1276d

▶ ▼ Similar bugs (2)

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
gvisor	panic: Watchdog goroutine is stuck	C			1831	1323d	1621d	14/26	fixed on 2021/04/13 18:45
gvisor	panic: Watchdog goroutine is stuck (3)	C			28	388d	1246d	0/26	moderation: reported C repro on 2021/06/29 10:13

Sample crash report:

panic: Watchdog goroutine is stuck
Stack for running G's are skipped while panicking.

goroutine 27 [running]:
panic(0x10443e0, 0xc0133481e0)
	GOROOT/src/runtime/panic.go:1065 +0x565 fp=0xc000607d30 sp=0xc000607c68 pc=0x437c65
gvisor.dev/gvisor/pkg/sentry/watchdog.(*Watchdog).doAction(0xc0004da080, 0x1, 0x0, 0xc000607e30)
	pkg/sentry/watchdog/watchdog.go:387 +0x565 fp=0xc000607e00 sp=0xc000607d30 pc=0xbc7b25
gvisor.dev/gvisor/pkg/sentry/watchdog.(*Watchdog).reportStuckWatchdog(0xc0004da080)
	pkg/sentry/watchdog/watchdog.go:352 +0x7c fp=0xc000607e68 sp=0xc000607e00 pc=0xbc759c
gvisor.dev/gvisor/pkg/sentry/watchdog.(*Watchdog).runTurn(0xc0004da080)
	pkg/sentry/watchdog/watchdog.go:284 +0x5e5 fp=0xc000607f58 sp=0xc000607e68 pc=0xbc71a5
gvisor.dev/gvisor/pkg/sentry/watchdog.(*Watchdog).loop(0xc0004da080)
	pkg/sentry/watchdog/watchdog.go:262 +0x34 fp=0xc000607fd8 sp=0xc000607f58 pc=0xbc6af4
runtime.goexit()
	src/runtime/asm_amd64.s:1371 +0x1 fp=0xc000607fe0 sp=0xc000607fd8 pc=0x472821
created by gvisor.dev/gvisor/pkg/sentry/watchdog.(*Watchdog).Start
	pkg/sentry/watchdog/watchdog.go:212 +0x1b1

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2021/05/30 03:09	gvisor	30bca3270b9a	325a8dab	.config	console log	report			info		ci-gvisor-ptrace-2	panic: Watchdog goroutine is stuck

* ~~Struck through~~ repros no longer work on HEAD.