panic: Sentry detected stuck tasks (4)

Status: fixed on 2020/11/18 07:03
Fix commit: 05d2a26f7a86 Fix possible deadlock in UDP.Write().
First crash: 2115d, last: 2114d
▶ ▼ Similar bugs (32)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
gvisor panic: Sentry detected stuck tasks (16) 2 5 1546d 1619d 14/26 fixed on 2022/06/10 10:13
gvisor panic: Sentry detected stuck tasks (9) 2 9 2014d 2015d 14/26 fixed on 2021/02/26 03:02
gvisor panic: Sentry detected stuck tasks (14) 2 20 1736d 1781d 14/26 fixed on 2021/12/02 12:02
gvisor panic: Sentry detected stuck tasks (17) 2 syz, C 822 1202d 1468d 26/26 fixed on 2023/05/19 14:28
gvisor panic: Sentry detected stuck tasks (12) 2 2 1812d 1812d 14/26 fixed on 2021/09/17 01:50
gvisor panic: Sentry detected stuck tasks (20) 2 syz, C 895 1111d 1114d 26/26 fixed on 2023/08/19 00:55
gvisor panic: Sentry detected stuck tasks 2 syz, C 506 2160d 2180d 0/26 fixed on 2020/10/03 12:41
gvisor panic: Sentry detected stuck tasks (6) 2 syz 714 2049d 2101d 14/26 fixed on 2021/01/22 19:49
gvisor panic: Sentry detected stuck tasks (7) 2 syz 2567 2017d 2048d 14/26 fixed on 2021/02/23 13:36
gvisor panic: Sentry detected stuck tasks (22) 2 5 1061d 1062d 26/26 fixed on 2023/10/07 05:04
gvisor panic: Sentry detected stuck tasks (8) 2 syz, C 64 2015d 2017d 14/26 fixed on 2021/02/25 13:46
gvisor panic: Sentry detected stuck tasks (13) 2 1 1811d 1811d 14/26 fixed on 2021/09/27 21:02
gvisor panic: Sentry detected stuck tasks (10) 2 syz, C 264 1962d 2014d 14/26 fixed on 2021/04/20 00:15
gvisor panic: Sentry detected stuck tasks (26) 2 syz, C 17 630d 631d 26/26 fixed on 2024/12/11 10:55
gvisor panic: Sentry detected stuck tasks (11) 2 syz, C 31 1828d 1955d 14/26 fixed on 2021/09/03 10:11
gvisor panic: Sentry detected stuck tasks (35) 2 syz 41 141d 194d 26/26 fixed on 2026/04/14 23:49
gvisor panic: Sentry detected stuck tasks (3) 2 syz, C 180 2115d 2119d 0/26 fixed on 2020/11/17 10:52
gvisor panic: Sentry detected stuck tasks (31) 2 3 350d 391d 26/26 fixed on 2025/09/19 06:07
gvisor panic: Sentry detected stuck tasks (28) 2 syz, C 11282 496d 600d 26/26 fixed on 2025/04/24 21:44
gvisor panic: Sentry detected stuck tasks (21) 2 64 1063d 1110d 26/26 fixed on 2023/10/05 23:05
gvisor panic: Sentry detected stuck tasks (2) 2 syz, C 951 2119d 2160d 0/26 fixed on 2020/11/13 09:22
gvisor panic: Sentry detected stuck tasks (5) 2 syz 83 2101d 2114d 0/26 fixed on 2020/12/01 11:18
gvisor panic: Sentry detected stuck tasks (33) 2 syz, C 13 288d 289d 26/26 fixed on 2025/11/19 02:01
gvisor panic: Sentry detected stuck tasks (27) 2 syz, C 14 607d 627d 26/26 fixed on 2025/01/07 21:12
gvisor panic: Sentry detected stuck tasks (32) 2 5 296d 335d 26/26 fixed on 2025/11/12 21:14
gvisor panic: Sentry detected stuck tasks (15) 2 syz, C 2582 1655d 1732d 14/26 fixed on 2022/02/25 14:00
gvisor panic: Sentry detected stuck tasks (34) 2 2 231d 237d 26/26 fixed on 2026/01/14 10:50
gvisor panic: Sentry detected stuck tasks (25) 2 syz, C 78 632d 661d 26/26 fixed on 2024/12/09 18:01
gvisor panic: Sentry detected stuck tasks (29) 2 syz, C 51 491d 495d 26/26 fixed on 2025/04/30 13:05
gvisor panic: Sentry detected stuck tasks (24) 2 syz, C 13 1049d 1055d 26/26 fixed on 2023/10/19 08:45
gvisor panic: Sentry detected stuck tasks (23) 2 syz, C 23 1056d 1061d 26/26 fixed on 2023/10/12 20:28
gvisor panic: Sentry detected stuck tasks (18) 2 syz, C 625 1143d 1202d 26/26 fixed on 2023/07/19 00:35

Sample crash report:
panic: Sentry detected 1 stuck task(s):
	Task tid: 20 (goroutine 380), entered RunSys state 3m41.04s ago.

Stack for running G's are skipped while panicking.

goroutine 113 [running]:
panic(0x10a0060, 0xc000990c20)
	GOROOT/src/runtime/panic.go:1064 +0x470 fp=0xc00055dc08 sp=0xc00055db50 pc=0x437030
gvisor.dev/gvisor/pkg/sentry/watchdog.(*Watchdog).doAction(0xc0000e4180, 0x1, 0x1, 0xc00055dd70)
	pkg/sentry/watchdog/watchdog.go:445 +0x5ff fp=0xc00055dd00 sp=0xc00055dc08 pc=0xc635bf
gvisor.dev/gvisor/pkg/sentry/watchdog.(*Watchdog).report(0xc0000e4180, 0xc000510d20, 0x5701, 0x34643cb700)
	pkg/sentry/watchdog/watchdog.go:393 +0x330 fp=0xc00055de38 sp=0xc00055dd00 pc=0xc62ef0
gvisor.dev/gvisor/pkg/sentry/watchdog.(*Watchdog).runTurn(0xc0000e4180)
	pkg/sentry/watchdog/watchdog.go:372 +0x58a fp=0xc00055df40 sp=0xc00055de38 pc=0xc62b0a
gvisor.dev/gvisor/pkg/sentry/watchdog.(*Watchdog).loop(0xc0000e4180)
	pkg/sentry/watchdog/watchdog.go:292 +0x56 fp=0xc00055dfd8 sp=0xc00055df40 pc=0xc62476
runtime.goexit()
	src/runtime/asm_amd64.s:1374 +0x1 fp=0xc00055dfe0 sp=0xc00055dfd8 pc=0x4705a1
created by gvisor.dev/gvisor/pkg/sentry/watchdog.(*Watchdog).Start
	pkg/sentry/watchdog/watchdog.go:231 +0x1e7

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/11/17 23:52 gvisor 938aabeecb93 7eca15bf .config console log report syz C ci-gvisor-kvm-direct-sandbox
2020/11/18 01:41 gvisor 938aabeecb93 09323409 .config console log report info ci-gvisor-ptrace-proxy-sandbox-race
2020/11/18 00:49 gvisor 938aabeecb93 09323409 .config console log report info ci-gvisor-main
2020/11/17 16:05 gvisor 938aabeecb93 1bf9a662 .config console log report info ci-gvisor-ptrace-proxy-sandbox-race
2020/11/17 13:04 gvisor 938aabeecb93 1bf9a662 .config console log report info ci-gvisor-ptrace-proxy-sandbox-race
* Struck through repros no longer work on HEAD.