panic: Incrementing non-positive ref count

goroutine 581976 [running]:
DIAGNOSIS:
I0210 07:05:05.234760   64739 log.go:209] ***************************
I0210 07:05:05.234820   64739 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-1]
I0210 07:05:05.234850   64739 log.go:209] Version release-20200127.0-99-g17b9f5e66238
I0210 07:05:05.234862   64739 log.go:209] PID: 64739
I0210 07:05:05.234873   64739 log.go:209] UID: 0, GID: 0
I0210 07:05:05.234885   64739 log.go:209] Configuration:
I0210 07:05:05.234894   64739 log.go:209] 		RootDir: /syzkaller/managers/main/workdir/gvisor_root
I0210 07:05:05.234904   64739 log.go:209] 		Platform: ptrace
I0210 07:05:05.234918   64739 log.go:209] 		FileAccess: shared, overlay: false
I0210 07:05:05.234942   64739 log.go:209] 		Network: none, logging: false
I0210 07:05:05.234953   64739 log.go:209] 		Strace: false, max size: 1024, syscalls: []
I0210 07:05:05.234962   64739 log.go:209] ***************************
D0210 07:05:05.235001   64739 log.go:202] Load container "/syzkaller/managers/main/workdir/gvisor_root" "ci-gvisor-main-1"
D0210 07:05:05.236403   64739 log.go:202] Signal container "ci-gvisor-main-1": signal 0
D0210 07:05:05.236438   64739 log.go:202] Signal sandbox "ci-gvisor-main-1"
D0210 07:05:05.236454   64739 log.go:202] Connecting to sandbox "ci-gvisor-main-1"
D0210 07:05:05.236617   64739 log.go:202] urpc: successfully marshalled 96 bytes.
I0210 07:05:05.774080   64739 log.go:209] Found sandbox "ci-gvisor-main-1", PID: 28508
I0210 07:05:05.774138   64739 log.go:209] Retrieving sandbox stacks
D0210 07:05:05.774150   64739 log.go:202] Stacks sandbox "ci-gvisor-main-1"
D0210 07:05:05.774169   64739 log.go:202] Connecting to sandbox "ci-gvisor-main-1"
D0210 07:05:05.774238   64739 log.go:202] urpc: successfully marshalled 36 bytes.
W0210 07:05:05.882195   64739 log.go:216] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-main-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-main-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer
W0210 07:05:05.882322   64739 log.go:216] Failure to execute command, err: 1