panic: Incrementing non-positive ref count

goroutine 4638 [running]:
DIAGNOSIS:
I0201 17:18:35.252498   33360 log.go:209] ***************************
I0201 17:18:35.252558   33360 log.go:209] Args: [/syzkaller/managers/main/current/image -root /syzkaller/managers/main/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=ptrace -file-access=shared -network=none debug -stacks --ps ci-gvisor-main-3]
I0201 17:18:35.252593   33360 log.go:209] Version release-20200127.0-51-g02997af5abd6
I0201 17:18:35.252606   33360 log.go:209] PID: 33360
I0201 17:18:35.252619   33360 log.go:209] UID: 0, GID: 0
I0201 17:18:35.252629   33360 log.go:209] Configuration:
I0201 17:18:35.252643   33360 log.go:209] 		RootDir: /syzkaller/managers/main/workdir/gvisor_root
I0201 17:18:35.252654   33360 log.go:209] 		Platform: ptrace
I0201 17:18:35.252669   33360 log.go:209] 		FileAccess: shared, overlay: false
I0201 17:18:35.252691   33360 log.go:209] 		Network: none, logging: false
I0201 17:18:35.252716   33360 log.go:209] 		Strace: false, max size: 1024, syscalls: []
I0201 17:18:35.252736   33360 log.go:209] ***************************
D0201 17:18:35.252784   33360 log.go:202] Load container "/syzkaller/managers/main/workdir/gvisor_root" "ci-gvisor-main-3"
D0201 17:18:35.254365   33360 log.go:202] Signal container "ci-gvisor-main-3": signal 0
D0201 17:18:35.254420   33360 log.go:202] Signal sandbox "ci-gvisor-main-3"
D0201 17:18:35.254443   33360 log.go:202] Connecting to sandbox "ci-gvisor-main-3"
D0201 17:18:35.254594   33360 log.go:202] urpc: successfully marshalled 96 bytes.
I0201 17:18:35.663300   33360 log.go:209] Found sandbox "ci-gvisor-main-3", PID: 18713
I0201 17:18:35.663339   33360 log.go:209] Retrieving sandbox stacks
D0201 17:18:35.663356   33360 log.go:202] Stacks sandbox "ci-gvisor-main-3"
D0201 17:18:35.663367   33360 log.go:202] Connecting to sandbox "ci-gvisor-main-3"
D0201 17:18:35.663454   33360 log.go:202] urpc: successfully marshalled 36 bytes.
W0201 17:18:35.687620   33360 log.go:216] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-main-3" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-main-3" stacks: urpc method "debug.Stacks" failed: connection reset by peer
W0201 17:18:35.687761   33360 log.go:216] Failure to execute command, err: 1