syzbot

 sign-in | mailing list | source | docs
🐞 Open [7]
🐞 Fixed [547]
🐞 Invalid [412]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
💬 Send us feedback

panic: Sentry detected stuck tasks (32)

Status: internal: reported on 2025/10/02 17:05
Fix commit: b3f000ac172f Do not retry on invalid UDP send buffers
Patched on: [ci-gvisor-arm64-ptrace-1 ci-gvisor-arm64-ptrace-1-race ci-gvisor-arm64-systrap-1 ci-gvisor-arm64-systrap-1-race ci-gvisor-kvm ci-gvisor-ptrace-1 ci-gvisor-ptrace-1-race ci-gvisor-ptrace-2 ci-gvisor-ptrace-2-race ci-gvisor-ptrace-3 ci-gvisor-ptrace-3-race ci-gvisor-systrap-1 ci-gvisor-systrap-1-race], missing on: [ci-gvisor-arm64-ptrace-1-cover ci-gvisor-arm64-ptrace-1-race-cover ci-gvisor-arm64-systrap-1-cover ci-gvisor-arm64-systrap-1-race-cover ci-gvisor-kvm-cover ci-gvisor-ptrace-1-cover ci-gvisor-ptrace-1-race-cover ci-gvisor-ptrace-2-cover ci-gvisor-ptrace-2-race-cover ci-gvisor-ptrace-3-cover ci-gvisor-ptrace-3-race-cover ci-gvisor-systrap-1-cover ci-gvisor-systrap-1-race-cover]
First crash: 14d, last: 8d07h
▶ ▼ Similar bugs (29)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
gvisor panic: Sentry detected stuck tasks (16) 2 5 1225d 1298d 14/26 fixed on 2022/06/10 10:13
gvisor panic: Sentry detected stuck tasks (9) 2 9 1693d 1694d 14/26 fixed on 2021/02/26 03:02
gvisor panic: Sentry detected stuck tasks (14) 2 20 1414d 1460d 14/26 fixed on 2021/12/02 12:02
gvisor panic: Sentry detected stuck tasks (17) 2 C 822 881d 1146d 26/26 fixed on 2023/05/19 14:28
gvisor panic: Sentry detected stuck tasks (12) 2 2 1491d 1491d 14/26 fixed on 2021/09/17 01:50
gvisor panic: Sentry detected stuck tasks (20) 2 C 895 790d 792d 26/26 fixed on 2023/08/19 00:55
gvisor panic: Sentry detected stuck tasks 2 C 506 1839d 1859d 0/26 fixed on 2020/10/03 12:41
gvisor panic: Sentry detected stuck tasks (6) 2 syz 714 1728d 1779d 14/26 fixed on 2021/01/22 19:49
gvisor panic: Sentry detected stuck tasks (7) 2 syz 2567 1696d 1727d 14/26 fixed on 2021/02/23 13:36
gvisor panic: Sentry detected stuck tasks (4) 2 C 5 1793d 1794d 0/26 fixed on 2020/11/18 07:03
gvisor panic: Sentry detected stuck tasks (22) 2 5 740d 741d 26/26 fixed on 2023/10/07 05:04
gvisor panic: Sentry detected stuck tasks (8) 2 C 64 1694d 1696d 14/26 fixed on 2021/02/25 13:46
gvisor panic: Sentry detected stuck tasks (13) 2 1 1490d 1490d 14/26 fixed on 2021/09/27 21:02
gvisor panic: Sentry detected stuck tasks (10) 2 C 264 1641d 1693d 14/26 fixed on 2021/04/20 00:15
gvisor panic: Sentry detected stuck tasks (26) 2 C 17 309d 310d 26/26 fixed on 2024/12/11 10:55
gvisor panic: Sentry detected stuck tasks (11) 2 C 31 1506d 1633d 14/26 fixed on 2021/09/03 10:11
gvisor panic: Sentry detected stuck tasks (3) 2 C 180 1794d 1798d 0/26 fixed on 2020/11/17 10:52
gvisor panic: Sentry detected stuck tasks (31) 2 3 29d 70d 26/26 fixed on 2025/09/19 06:07
gvisor panic: Sentry detected stuck tasks (28) 2 C 11282 174d 278d 26/26 fixed on 2025/04/24 21:44
gvisor panic: Sentry detected stuck tasks (21) 2 64 741d 789d 26/26 fixed on 2023/10/05 23:05
gvisor panic: Sentry detected stuck tasks (2) 2 C 951 1798d 1839d 0/26 fixed on 2020/11/13 09:22
gvisor panic: Sentry detected stuck tasks (5) 2 syz 83 1780d 1793d 0/26 fixed on 2020/12/01 11:18
gvisor panic: Sentry detected stuck tasks (27) 2 C 14 286d 306d 26/26 fixed on 2025/01/07 21:12
gvisor panic: Sentry detected stuck tasks (15) 2 C 2582 1334d 1411d 14/26 fixed on 2022/02/25 14:00
gvisor panic: Sentry detected stuck tasks (25) 2 C 78 311d 339d 26/26 fixed on 2024/12/09 18:01
gvisor panic: Sentry detected stuck tasks (29) 2 C 51 169d 174d 26/26 fixed on 2025/04/30 13:05
gvisor panic: Sentry detected stuck tasks (24) 2 C 13 728d 734d 26/26 fixed on 2023/10/19 08:45
gvisor panic: Sentry detected stuck tasks (23) 2 C 23 735d 740d 26/26 fixed on 2023/10/12 20:28
gvisor panic: Sentry detected stuck tasks (18) 2 C 625 822d 881d 26/26 fixed on 2023/07/19 00:35

Sample crash report:
panic: Sentry detected 1 stuck task(s):
		Task tid: 46325 (goroutine 336806), entered RunSys state 3m27.64s ago.
	Search for 'goroutine <id>' in the stack dump to find the offending goroutine(s)
	Stack for running G's are skipped while panicking.

goroutine 229 gp=0xc000351dc0 m=20 mp=0xc00070b008 [running]:
panic({0x1c29aa0?, 0xc000499b10?})
	GOROOT/src/runtime/panic.go:811 +0x168 fp=0xc001e09ba8 sp=0xc001e09af8 pc=0x47d728
gvisor.dev/gvisor/pkg/sentry/watchdog.(*Watchdog).doAction(0xc0003ce080, 0x1, 0x1, 0xc001e09d28)
	pkg/sentry/watchdog/watchdog.go:376 +0x499 fp=0xc001e09cc0 sp=0xc001e09ba8 pc=0x10085d9
gvisor.dev/gvisor/pkg/sentry/watchdog.(*Watchdog).report(0xc0003ce080, 0xc002b1e120, 0x1, {0x1?})
	pkg/sentry/watchdog/watchdog.go:335 +0x3b0 fp=0xc001e09e08 sp=0xc001e09cc0 pc=0x1008050
gvisor.dev/gvisor/pkg/sentry/watchdog.(*Watchdog).runTurn(0xc0003ce080)
	pkg/sentry/watchdog/watchdog.go:317 +0x76d fp=0xc001e09f30 sp=0xc001e09e08 pc=0x1007aed
gvisor.dev/gvisor/pkg/sentry/watchdog.(*Watchdog).loop(0xc0003ce080)
	pkg/sentry/watchdog/watchdog.go:254 +0x3b fp=0xc001e09fc0 sp=0xc001e09f30 pc=0x100727b
gvisor.dev/gvisor/pkg/sentry/watchdog.(*Watchdog).Start.gowrap2()
	pkg/sentry/watchdog/watchdog.go:205 +0x34 fp=0xc001e09fe0 sp=0xc001e09fc0 pc=0x1006c74
runtime.goexit({})
	src/runtime/asm_amd64.s:1700 +0x1 fp=0xc001e09fe8 sp=0xc001e09fe0 pc=0x486aa1
created by gvisor.dev/gvisor/pkg/sentry/watchdog.(*Watchdog).Start in goroutine 1
	pkg/sentry/watchdog/watchdog.go:205 +0x39b

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/10/08 10:57 gvisor 6bf3c4885132 7e2882b3 .config console log report info ci-gvisor-systrap-1-race panic: Sentry detected stuck tasks
2025/10/05 22:39 gvisor 73f1154f95e7 49379ee0 .config console log report info ci-gvisor-systrap-1-race panic: Sentry detected stuck tasks
2025/10/02 16:04 gvisor 5ad0647ea1a5 49379ee0 .config console log report info ci-gvisor-systrap-1-race panic: Sentry detected stuck tasks
* Struck through repros no longer work on HEAD.