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panic: Incrementing non-positive ref count (2)

Status: fixed on 2019/07/04 17:55
Fix commit: 4f2f44320f9b Simplify (and fix) refcounts in createAt.
First crash: 1979d, last: 1972d
▶ ▼ Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
gvisor panic: Incrementing non-positive ref count (4) C 5 1751d 1753d 0/26 fixed on 2020/02/27 21:02
gvisor panic: Incrementing non-positive ref count C 26 2284d 2341d 0/26 closed as invalid on 2018/12/14 22:50
gvisor panic: Incrementing non-positive ref count (3) 2 1795d 1805d 0/26 fixed on 2020/01/08 08:41

Sample crash report:
panic: Incrementing non-positive ref count

goroutine 275 [running]:
gvisor.dev/gvisor/pkg/refs.(*AtomicRefCount).IncRef(...)
	pkg/refs/refcounter.go:213
gvisor.dev/gvisor/pkg/sentry/fs.(*Dirent).IncRef(...)
DIAGNOSIS:
retrieving stacks: getting sandbox "ci-gvisor-ptrace-direct-overlay-host-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer

Crashes (183):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/06/28 11:08 https://gvisor.googlesource.com/gvisor master 5b41ba5d0eca 7509bf36 .config console log report syz C ci-gvisor-ptrace-direct-overlay-host
2019/06/28 11:06 https://gvisor.googlesource.com/gvisor master 5b41ba5d0eca 7509bf36 .config console log report syz C ci-gvisor-main
2019/06/29 07:17 https://gvisor.googlesource.com/gvisor master 7dae043fecc1 7509bf36 .config console log report syz ci-gvisor-kvm-proxy-overlay-sandbox
2019/06/28 09:57 https://gvisor.googlesource.com/gvisor master e27608390336 7509bf36 .config console log report syz ci-gvisor-kvm-direct-sandbox
2019/06/28 09:50 https://gvisor.googlesource.com/gvisor master 5b41ba5d0eca 7509bf36 .config console log report syz ci-gvisor-kvm-direct-overlay-host-race
2019/07/03 23:45 https://gvisor.googlesource.com/gvisor master 0aa9418a778b 55565fa0 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/03 23:33 https://gvisor.googlesource.com/gvisor master 0aa9418a778b 55565fa0 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/03 19:50 https://gvisor.googlesource.com/gvisor master 0aa9418a778b 55565fa0 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/03 17:29 https://gvisor.googlesource.com/gvisor master 0aa9418a778b 55565fa0 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/03 14:15 https://gvisor.googlesource.com/gvisor master 0aa9418a778b 55565fa0 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/03 11:44 https://gvisor.googlesource.com/gvisor master 0aa9418a778b 55565fa0 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/03 10:44 https://gvisor.googlesource.com/gvisor master 0aa9418a778b 55565fa0 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/03 09:02 https://gvisor.googlesource.com/gvisor master 0aa9418a778b 55565fa0 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/03 07:15 https://gvisor.googlesource.com/gvisor master 0aa9418a778b 55565fa0 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/02 22:50 https://gvisor.googlesource.com/gvisor master 0aa9418a778b 5f175e9c .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/02 22:50 https://gvisor.googlesource.com/gvisor master 0aa9418a778b 5f175e9c .config console log report ci-gvisor-main
2019/07/02 21:42 https://gvisor.googlesource.com/gvisor master 0aa9418a778b 5f175e9c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2019/07/02 20:36 https://gvisor.googlesource.com/gvisor master 0aa9418a778b 5f175e9c .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/02 19:28 https://gvisor.googlesource.com/gvisor master 0aa9418a778b 5f175e9c .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/02 18:18 https://gvisor.googlesource.com/gvisor master 0aa9418a778b 5f175e9c .config console log report ci-gvisor-main
2019/07/02 17:12 https://gvisor.googlesource.com/gvisor master 0aa9418a778b 5f175e9c .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/02 15:41 https://gvisor.googlesource.com/gvisor master 0aa9418a778b 5f175e9c .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/02 13:55 https://gvisor.googlesource.com/gvisor master 0aa9418a778b 5f175e9c .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/02 10:46 https://gvisor.googlesource.com/gvisor master 4a72c8078ebd cccc4302 .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2019/07/02 10:26 https://gvisor.googlesource.com/gvisor master 4a72c8078ebd cccc4302 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/02 07:43 https://gvisor.googlesource.com/gvisor master 4a72c8078ebd cccc4302 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/02 06:41 https://gvisor.googlesource.com/gvisor master 4a72c8078ebd cccc4302 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/02 06:40 https://gvisor.googlesource.com/gvisor master 4a72c8078ebd cccc4302 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/02 05:06 https://gvisor.googlesource.com/gvisor master 4a72c8078ebd cccc4302 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/02 03:47 https://gvisor.googlesource.com/gvisor master 4a72c8078ebd cccc4302 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/02 02:30 https://gvisor.googlesource.com/gvisor master 4a72c8078ebd cccc4302 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/01 21:38 https://gvisor.googlesource.com/gvisor master 3446f4e29bd5 907bf746 .config console log report ci-gvisor-kvm-direct-sandbox
2019/07/01 20:36 https://gvisor.googlesource.com/gvisor master 3446f4e29bd5 907bf746 .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2019/07/01 18:35 https://gvisor.googlesource.com/gvisor master 3446f4e29bd5 907bf746 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/01 17:12 https://gvisor.googlesource.com/gvisor master 3446f4e29bd5 907bf746 .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2019/07/01 17:03 https://gvisor.googlesource.com/gvisor master 3446f4e29bd5 907bf746 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/01 15:50 https://gvisor.googlesource.com/gvisor master 3446f4e29bd5 907bf746 .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2019/07/01 14:06 https://gvisor.googlesource.com/gvisor master 3446f4e29bd5 907bf746 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/01 09:52 https://gvisor.googlesource.com/gvisor master 3446f4e29bd5 699d6448 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/01 06:12 https://gvisor.googlesource.com/gvisor master 3446f4e29bd5 699d6448 .config console log report ci-gvisor-ptrace-direct-overlay-host
2019/07/01 05:09 https://gvisor.googlesource.com/gvisor master 3446f4e29bd5 699d6448 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/01 03:57 https://gvisor.googlesource.com/gvisor master 3446f4e29bd5 699d6448 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/01 03:14 https://gvisor.googlesource.com/gvisor master 3446f4e29bd5 699d6448 .config console log report ci-gvisor-main
2019/07/01 01:04 https://gvisor.googlesource.com/gvisor master 3446f4e29bd5 699d6448 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/06/30 23:50 https://gvisor.googlesource.com/gvisor master 3446f4e29bd5 699d6448 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/06/30 21:43 https://gvisor.googlesource.com/gvisor master 3446f4e29bd5 699d6448 .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2019/06/30 20:29 https://gvisor.googlesource.com/gvisor master 3446f4e29bd5 699d6448 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/06/30 19:14 https://gvisor.googlesource.com/gvisor master 3446f4e29bd5 699d6448 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/06/30 18:06 https://gvisor.googlesource.com/gvisor master 3446f4e29bd5 7509bf36 .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2019/06/30 16:44 https://gvisor.googlesource.com/gvisor master 3446f4e29bd5 7509bf36 .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2019/06/26 23:22 https://gvisor.googlesource.com/gvisor master 42e212f6b7d4 7509bf36 .config console log report ci-gvisor-kvm-proxy-overlay-sandbox
* Struck through repros no longer work on HEAD.