panic: runtime error: index out of range

DIAGNOSIS:
I0403 18:29:07.434040   20164 x:0] ***************************
I0403 18:29:07.434167   20164 x:0] Args: [/syzkaller/managers/kvm-direct-overlay-host-race/current/image -root /syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root -watchdog-action=panic -network=none -debug -platform=ptrace -file-access=exclusive -overlay -network=host debug -stacks ci-gvisor-kvm-direct-overlay-host-race-1]
I0403 18:29:07.434223   20164 x:0] Version release-20190304.1-78-gc4caccd54042
I0403 18:29:07.434245   20164 x:0] PID: 20164
I0403 18:29:07.434270   20164 x:0] UID: 0, GID: 0
I0403 18:29:07.434301   20164 x:0] Configuration:
I0403 18:29:07.434312   20164 x:0] 		RootDir: /syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root
I0403 18:29:07.434324   20164 x:0] 		Platform: ptrace
I0403 18:29:07.434353   20164 x:0] 		FileAccess: exclusive, overlay: true
I0403 18:29:07.434373   20164 x:0] 		Network: host, logging: false
I0403 18:29:07.434390   20164 x:0] 		Strace: false, max size: 1024, syscalls: []
I0403 18:29:07.434410   20164 x:0] ***************************
D0403 18:29:07.434458   20164 x:0] Load container "/syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root" "ci-gvisor-kvm-direct-overlay-host-race-1"
D0403 18:29:07.442823   20164 x:0] Signal container "ci-gvisor-kvm-direct-overlay-host-race-1": signal 0
D0403 18:29:07.442895   20164 x:0] Signal sandbox "ci-gvisor-kvm-direct-overlay-host-race-1"
D0403 18:29:07.442940   20164 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-overlay-host-race-1"
D0403 18:29:07.444198   20164 x:0] urpc: successfully marshalled 120 bytes.
I0403 18:29:07.975300   20164 x:0] Found sandbox "ci-gvisor-kvm-direct-overlay-host-race-1", PID: 7733
I0403 18:29:07.975362   20164 x:0] Retrieving sandbox stacks
D0403 18:29:07.975378   20164 x:0] Stacks sandbox "ci-gvisor-kvm-direct-overlay-host-race-1"
D0403 18:29:07.975417   20164 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-overlay-host-race-1"
D0403 18:29:07.975530   20164 x:0] urpc: successfully marshalled 36 bytes.
W0403 18:29:08.020687   20164 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-kvm-direct-overlay-host-race-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-kvm-direct-overlay-host-race-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer