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panic: Incrementing non-positive ref count (3)

Status: fixed on 2020/01/08 08:41
Fix commit: 6410387ff9b4 Cleanup Shm reference handling
First crash: 1805d, last: 1795d
▶ ▼ 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 (2) C 183 1972d 1979d 0/26 fixed on 2019/07/04 17:55
gvisor panic: Incrementing non-positive ref count C 26 2284d 2341d 0/26 closed as invalid on 2018/12/14 22:50

Sample crash report:
panic: Incrementing non-positive ref count
DIAGNOSIS:
I1228 07:30:25.323192   46173 x:0] ***************************
I1228 07:30:25.323216   46173 x:0] Args: [/syzkaller/managers/kvm-direct-sandbox/current/image -root /syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=kvm -file-access=exclusive -network=sandbox debug -stacks --ps ci-gvisor-kvm-direct-sandbox-1]
I1228 07:30:25.323246   46173 x:0] Version release-20191213.0-43-gd1528df71502
I1228 07:30:25.323261   46173 x:0] PID: 46173
I1228 07:30:25.323271   46173 x:0] UID: 0, GID: 0
I1228 07:30:25.323276   46173 x:0] Configuration:
I1228 07:30:25.323299   46173 x:0] 		RootDir: /syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root
I1228 07:30:25.323306   46173 x:0] 		Platform: kvm
I1228 07:30:25.323311   46173 x:0] 		FileAccess: exclusive, overlay: false
I1228 07:30:25.323321   46173 x:0] 		Network: sandbox, logging: false
I1228 07:30:25.323329   46173 x:0] 		Strace: false, max size: 1024, syscalls: []
I1228 07:30:25.323344   46173 x:0] ***************************
D1228 07:30:25.323384   46173 x:0] Load container "/syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root" "ci-gvisor-kvm-direct-sandbox-1"
D1228 07:30:25.325127   46173 x:0] Signal container "ci-gvisor-kvm-direct-sandbox-1": signal 0
D1228 07:30:25.325159   46173 x:0] Signal sandbox "ci-gvisor-kvm-direct-sandbox-1"
D1228 07:30:25.325178   46173 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-sandbox-1"
D1228 07:30:25.325354   46173 x:0] urpc: successfully marshalled 110 bytes.
I1228 07:30:25.831194   46173 x:0] Found sandbox "ci-gvisor-kvm-direct-sandbox-1", PID: 61182
I1228 07:30:25.831210   46173 x:0] Retrieving sandbox stacks
D1228 07:30:25.831216   46173 x:0] Stacks sandbox "ci-gvisor-kvm-direct-sandbox-1"
D1228 07:30:25.831222   46173 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-sandbox-1"
W1228 07:30:25.831265   46173 x:0] FATAL ERROR: retrieving stacks: connecting to control server at PID 61182: connection refused
retrieving stacks: connecting to control server at PID 61182: connection refused
W1228 07:30:25.831336   46173 x:0] Failure to execute command, err: 1

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/12/28 07:30 https://gvisor.googlesource.com/gvisor master d1528df71502 8b967267 .config console log report ci-gvisor-kvm-direct-sandbox
2019/12/18 12:42 https://gvisor.googlesource.com/gvisor master 64d00cc63dc8 1b49002e .config console log report ci-gvisor-main
* Struck through repros no longer work on HEAD.