panic: Incrementing non-positive ref count
DIAGNOSIS:
I0201 11:03:51.340690    8864 log.go:209] ***************************
I0201 11:03:51.340883    8864 log.go:209] Args: [/syzkaller/managers/ptrace-direct-overlay-host-race/current/image -root /syzkaller/managers/ptrace-direct-overlay-host-race/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=ptrace -file-access=exclusive -overlay -network=host -TESTONLY-unsafe-nonroot debug -stacks --ps ci-gvisor-ptrace-direct-overlay-host-race-0]
I0201 11:03:51.341990    8864 log.go:209] Version release-20200127.0-51-g02997af5abd6
I0201 11:03:51.342168    8864 log.go:209] PID: 8864
I0201 11:03:51.342349    8864 log.go:209] UID: 0, GID: 0
I0201 11:03:51.342505    8864 log.go:209] Configuration:
I0201 11:03:51.342679    8864 log.go:209] 		RootDir: /syzkaller/managers/ptrace-direct-overlay-host-race/workdir/gvisor_root
I0201 11:03:51.342824    8864 log.go:209] 		Platform: ptrace
I0201 11:03:51.342958    8864 log.go:209] 		FileAccess: exclusive, overlay: true
I0201 11:03:51.343651    8864 log.go:209] 		Network: host, logging: false
I0201 11:03:51.343798    8864 log.go:209] 		Strace: false, max size: 1024, syscalls: []
I0201 11:03:51.343964    8864 log.go:209] ***************************
W0201 11:03:51.344076    8864 log.go:216] Block the TERM signal. This is only safe in tests!
D0201 11:03:51.363463    8864 log.go:202] Load container "/syzkaller/managers/ptrace-direct-overlay-host-race/workdir/gvisor_root" "ci-gvisor-ptrace-direct-overlay-host-race-0"
D0201 11:03:51.414897    8864 log.go:202] Signal container "ci-gvisor-ptrace-direct-overlay-host-race-0": signal 0
D0201 11:03:51.420386    8864 log.go:202] Signal sandbox "ci-gvisor-ptrace-direct-overlay-host-race-0"
D0201 11:03:51.420561    8864 log.go:202] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-race-0"
D0201 11:03:51.425781    8864 log.go:202] urpc: successfully marshalled 123 bytes.
W0201 11:03:52.102368    8864 log.go:216] FATAL ERROR: container sandbox is not running
container sandbox is not running
W0201 11:03:52.106652    8864 log.go:216] Failure to execute command, err: 1