panic: runtime error: index out of range [1] with length 0
DIAGNOSIS:
I0305 11:16:59.112887   33140 main.go:305] ***************************
I0305 11:16:59.113050   33140 main.go:306] Args: [/syzkaller/managers/ptrace-proxy-sandbox-race/current/image -root /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=ptrace -file-access=shared -network=sandbox -TESTONLY-unsafe-nonroot debug -stacks --ps ci-gvisor-ptrace-proxy-sandbox-race-0]
I0305 11:16:59.113269   33140 main.go:307] Version release-20200219.0-72-gce4d1e45bb88
I0305 11:16:59.113359   33140 main.go:308] PID: 33140
I0305 11:16:59.113444   33140 main.go:309] UID: 0, GID: 0
I0305 11:16:59.113531   33140 main.go:310] Configuration:
I0305 11:16:59.113596   33140 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0305 11:16:59.113674   33140 main.go:312] 		Platform: ptrace
I0305 11:16:59.113740   33140 main.go:313] 		FileAccess: shared, overlay: false
I0305 11:16:59.113892   33140 main.go:314] 		Network: sandbox, logging: false
I0305 11:16:59.113961   33140 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0305 11:16:59.114081   33140 main.go:316] ***************************
W0305 11:16:59.114161   33140 main.go:321] Block the TERM signal. This is only safe in tests!
D0305 11:16:59.114356   33140 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0305 11:16:59.121584   33140 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-0": signal 0
D0305 11:16:59.121744   33140 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0305 11:16:59.121868   33140 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0305 11:16:59.122422   33140 urpc.go:534] urpc: successfully marshalled 117 bytes.
W0305 11:16:59.641757   33140 error.go:48] FATAL ERROR: container sandbox is not running
container sandbox is not running
W0305 11:16:59.642197   33140 main.go:338] Failure to execute command, err: 1