panic: runtime error: index out of range

DIAGNOSIS:
I0403 14:16:28.564873   47911 x:0] ***************************
I0403 14:16:28.564923   47911 x:0] Args: [/syzkaller/managers/ptrace-direct-overlay-host/current/image -root /syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root -watchdog-action=panic -network=none -debug -platform=ptrace -file-access=shared -network=host debug -stacks ci-gvisor-ptrace-direct-overlay-host-1]
I0403 14:16:28.564936   47911 x:0] Version release-20190304.1-78-gc4caccd54042
I0403 14:16:28.564942   47911 x:0] PID: 47911
I0403 14:16:28.564953   47911 x:0] UID: 0, GID: 0
I0403 14:16:28.564960   47911 x:0] Configuration:
I0403 14:16:28.564963   47911 x:0] 		RootDir: /syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root
I0403 14:16:28.564966   47911 x:0] 		Platform: ptrace
I0403 14:16:28.564973   47911 x:0] 		FileAccess: shared, overlay: false
I0403 14:16:28.564988   47911 x:0] 		Network: host, logging: false
I0403 14:16:28.564994   47911 x:0] 		Strace: false, max size: 1024, syscalls: []
I0403 14:16:28.565002   47911 x:0] ***************************
D0403 14:16:28.565019   47911 x:0] Load container "/syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root" "ci-gvisor-ptrace-direct-overlay-host-1"
D0403 14:16:28.566467   47911 x:0] Signal container "ci-gvisor-ptrace-direct-overlay-host-1": signal 0
D0403 14:16:28.566487   47911 x:0] Signal sandbox "ci-gvisor-ptrace-direct-overlay-host-1"
D0403 14:16:28.566498   47911 x:0] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-1"
D0403 14:16:28.566826   47911 x:0] urpc: successfully marshalled 118 bytes.
I0403 14:16:28.882889   47911 x:0] Found sandbox "ci-gvisor-ptrace-direct-overlay-host-1", PID: 4541
I0403 14:16:28.882915   47911 x:0] Retrieving sandbox stacks
D0403 14:16:28.882920   47911 x:0] Stacks sandbox "ci-gvisor-ptrace-direct-overlay-host-1"
D0403 14:16:28.882925   47911 x:0] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-1"
D0403 14:16:28.882991   47911 x:0] urpc: successfully marshalled 36 bytes.
W0403 14:16:28.915775   47911 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-ptrace-direct-overlay-host-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-ptrace-direct-overlay-host-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer