panic: nested locking: kernel.taskSetRWMutex: (3)

Status: fixed on 2026/05/08 08:36
Fix commit: 8c2aa261c278 pidfds: Disallow fasync on pidfds
First crash: 118d, last: 118d
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
gvisor panic: nested locking: kernel.taskSetRWMutex: (2) 2 syz, C 5 1349d 1342d 0/26 closed as invalid on 2024/12/13 00:18
gvisor panic: nested locking: kernel.taskSetRWMutex: 2 syz, C 2 1457d 1457d 14/26 fixed on 2022/10/26 08:58

Sample crash report:
panic: nested locking: kernel.taskSetRWMutex:
	goroutine 445 [running]:
	gvisor.dev/gvisor/pkg/sentry/kernel.(*taskSetRWMutex).RLock(0xc000018320)
		/syzkaller/.cache/bazel/_bazel_root/a13edd57d9dad04937e1fb5843ea1532/sandbox/linux-sandbox/9/execroot/_main/gopath/src/gvisor.dev/gvisor/pkg/sentry/kernel/taskset_mutex.go:59 +0x98
	gvisor.dev/gvisor/pkg/sentry/kernel.(*ThreadGroup).Leader(0xc0012b9808)
		/syzkaller/.cache/bazel/_bazel_root/a13edd57d9dad04937e1fb5843ea1532/sandbox/linux-sandbox/9/execroot/_main/gopath/src/gvisor.dev/gvisor/pkg/sentry/kernel/threads.go:484 +0xb4
	gvisor.dev/gvisor/pkg/sentry/kernel/fasync.(*FileAsync).NotifyEvent(0xc0002ca9a0, 0x41)
		/syzkaller/.cache/bazel/_bazel_root/a13edd57d9dad04937e1fb5843ea1532/sandbox/linux-sandbox/9/execroot/_main/gopath/src/gvisor.dev/gvisor/pkg/sentry/kernel/fasync/fasync.go:107 +0x2b2
	gvisor.dev/gvisor/pkg/waiter.(*Queue).Notify(0xc001063bd0, 0x41)
		/syzkaller/.cache/bazel/_bazel_root/a13edd57d9dad04937e1fb5843ea1532/sandbox/linux-sandbox/9/execroot/_main/gopath/src/gvisor.dev/gvisor/pkg/waiter/waiter.go:253 +0x13d
	gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).notifyPIDFDsLocked(0xc001314c88)
		/syzkaller/.cache/bazel/_bazel_root/a13edd57d9dad04937e1fb5843ea1532/sandbox/linux-sandbox/9/execroot/_main/gopath/src/gvisor.dev/gvisor/pkg/sentry/kernel/pidfd.go:281 +0xed
	gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).exitNotifyLocked(0xc001314c88, 0x0)
		/syzkaller/.cache/bazel/_bazel_root/a13edd57d9dad04937e1fb5843ea1532/sandbox/linux-sandbox/9/execroot/_main/gopath/src/gvisor.dev/gvisor/pkg/sentry/kernel/task_exit.go:655 +0x19b
	gvisor.dev/gvisor/pkg/sentry/kernel.(*runExitNotify).execute(0xc001314c88?, 0xc001314c88)
		/syzkaller/.cache/bazel/_bazel_root/a13edd57d9dad04937e1fb5843ea1532/sandbox/linux-sandbox/9/execroot/_main/gopath/src/gvisor.dev/gvisor/pkg/sentry/kernel/task_exit.go:634 +0x3bd
	gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc001314c88, 0x4d)
		/syzkaller/.cache/bazel/_bazel_root/a13edd57d9dad04937e1fb5843ea1532/sandbox/linux-sandbox/9/execroot/_main/gopath/src/gvisor.dev/gvisor/pkg/sentry/kernel/task_run.go:89 +0x6e7
	created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 546
		/syzkaller/.cache/bazel/_bazel_root/a13edd57d9dad04937e1fb5843ea1532/sandbox/linux-sandbox/9/execroot/_main/gopath/src/gvisor.dev/gvisor/pkg/sentry/kernel/task_start.go:416 +0x1be

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/04 01:16 gvisor f395c7e409ad a0d91488 .config console log report syz / log C ci-gvisor-systrap-1-race-cover panic: nested locking: kernel.taskSetRWMutex:
2026/05/04 01:16 gvisor f395c7e409ad a0d91488 .config console log report syz / log C ci-gvisor-ptrace-2-race-cover panic: nested locking: kernel.taskSetRWMutex:
2026/05/04 01:16 gvisor f395c7e409ad a0d91488 .config console log report syz / log C ci-gvisor-ptrace-3-race-cover panic: nested locking: kernel.taskSetRWMutex:
2026/05/04 01:16 gvisor f395c7e409ad a0d91488 .config console log report syz / log C ci-gvisor-ptrace-1-race-cover panic: nested locking: kernel.taskSetRWMutex:
2026/05/04 01:07 gvisor f395c7e409ad a0d91488 .config console log report syz / log C ci-gvisor-ptrace-3-race panic: nested locking: kernel.taskSetRWMutex:
2026/05/04 00:58 gvisor f395c7e409ad a0d91488 .config console log report syz / log C ci-gvisor-ptrace-1-race panic: nested locking: kernel.taskSetRWMutex:
2026/05/04 00:58 gvisor f395c7e409ad a0d91488 .config console log report syz / log C ci-gvisor-ptrace-2-race panic: nested locking: kernel.taskSetRWMutex:
2026/05/04 00:58 gvisor f395c7e409ad a0d91488 .config console log report syz / log C ci-gvisor-systrap-1-race panic: nested locking: kernel.taskSetRWMutex:
* Struck through repros no longer work on HEAD.