panic: runtime error: index out of range

goroutine 262089 [running]:
DIAGNOSIS:
I0403 12:05:43.823807   38501 x:0] ***************************
I0403 12:05:43.823867   38501 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-3]
I0403 12:05:43.823880   38501 x:0] Version release-20190304.1-78-gc4caccd54042
I0403 12:05:43.823884   38501 x:0] PID: 38501
I0403 12:05:43.823891   38501 x:0] UID: 0, GID: 0
I0403 12:05:43.823894   38501 x:0] Configuration:
I0403 12:05:43.823900   38501 x:0] 		RootDir: /syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root
I0403 12:05:43.823904   38501 x:0] 		Platform: ptrace
I0403 12:05:43.823910   38501 x:0] 		FileAccess: shared, overlay: false
I0403 12:05:43.823915   38501 x:0] 		Network: host, logging: false
I0403 12:05:43.823921   38501 x:0] 		Strace: false, max size: 1024, syscalls: []
I0403 12:05:43.823924   38501 x:0] ***************************
D0403 12:05:43.823950   38501 x:0] Load container "/syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root" "ci-gvisor-ptrace-direct-overlay-host-3"
D0403 12:05:43.826188   38501 x:0] Signal container "ci-gvisor-ptrace-direct-overlay-host-3": signal 0
D0403 12:05:43.826225   38501 x:0] Signal sandbox "ci-gvisor-ptrace-direct-overlay-host-3"
D0403 12:05:43.826231   38501 x:0] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-3"
D0403 12:05:43.827614   38501 x:0] urpc: successfully marshalled 118 bytes.
I0403 12:05:44.095145   38501 x:0] Found sandbox "ci-gvisor-ptrace-direct-overlay-host-3", PID: 32269
I0403 12:05:44.095165   38501 x:0] Retrieving sandbox stacks
D0403 12:05:44.095175   38501 x:0] Stacks sandbox "ci-gvisor-ptrace-direct-overlay-host-3"
D0403 12:05:44.095180   38501 x:0] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-3"
D0403 12:05:44.095249   38501 x:0] urpc: successfully marshalled 36 bytes.
W0403 12:05:44.130140   38501 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-ptrace-direct-overlay-host-3" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-ptrace-direct-overlay-host-3" stacks: urpc method "debug.Stacks" failed: connection reset by peer