panic: runtime error: index out of range

goroutine 324796 [running]:
DIAGNOSIS:
I0403 11:06:13.951980   42459 x:0] ***************************
I0403 11:06:13.952036   42459 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-0]
I0403 11:06:13.952050   42459 x:0] Version release-20190304.1-78-gc4caccd54042
I0403 11:06:13.952055   42459 x:0] PID: 42459
I0403 11:06:13.952061   42459 x:0] UID: 0, GID: 0
I0403 11:06:13.952064   42459 x:0] Configuration:
I0403 11:06:13.952067   42459 x:0] 		RootDir: /syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root
I0403 11:06:13.952081   42459 x:0] 		Platform: ptrace
I0403 11:06:13.952087   42459 x:0] 		FileAccess: shared, overlay: false
I0403 11:06:13.952099   42459 x:0] 		Network: host, logging: false
I0403 11:06:13.952105   42459 x:0] 		Strace: false, max size: 1024, syscalls: []
I0403 11:06:13.952109   42459 x:0] ***************************
D0403 11:06:13.952124   42459 x:0] Load container "/syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root" "ci-gvisor-ptrace-direct-overlay-host-0"
D0403 11:06:13.953611   42459 x:0] Signal container "ci-gvisor-ptrace-direct-overlay-host-0": signal 0
D0403 11:06:13.953630   42459 x:0] Signal sandbox "ci-gvisor-ptrace-direct-overlay-host-0"
D0403 11:06:13.953635   42459 x:0] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-0"
D0403 11:06:13.953913   42459 x:0] urpc: successfully marshalled 118 bytes.
I0403 11:06:14.263401   42459 x:0] Found sandbox "ci-gvisor-ptrace-direct-overlay-host-0", PID: 37004
I0403 11:06:14.263420   42459 x:0] Retrieving sandbox stacks
D0403 11:06:14.263423   42459 x:0] Stacks sandbox "ci-gvisor-ptrace-direct-overlay-host-0"
D0403 11:06:14.263428   42459 x:0] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-0"
D0403 11:06:14.263478   42459 x:0] urpc: successfully marshalled 36 bytes.
W0403 11:06:14.342886   42459 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-ptrace-direct-overlay-host-0" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-ptrace-direct-overlay-host-0" stacks: urpc method "debug.Stacks" failed: connection reset by peer