panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x46731a]
DIAGNOSIS:
I0301 09:07:23.573052   43320 main.go:305] ***************************
I0301 09:07:23.573110   43320 main.go:306] 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 -alsologtostderr -platform=ptrace -file-access=shared -network=host debug -stacks --ps ci-gvisor-ptrace-direct-overlay-host-3]
I0301 09:07:23.573160   43320 main.go:307] Version release-20200219.0-72-gce4d1e45bb88
I0301 09:07:23.573204   43320 main.go:308] PID: 43320
I0301 09:07:23.573229   43320 main.go:309] UID: 0, GID: 0
I0301 09:07:23.573258   43320 main.go:310] Configuration:
I0301 09:07:23.573286   43320 main.go:311] 		RootDir: /syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root
I0301 09:07:23.573320   43320 main.go:312] 		Platform: ptrace
I0301 09:07:23.573341   43320 main.go:313] 		FileAccess: shared, overlay: false
I0301 09:07:23.573368   43320 main.go:314] 		Network: host, logging: false
I0301 09:07:23.573406   43320 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0301 09:07:23.573434   43320 main.go:316] ***************************
D0301 09:07:23.573496   43320 container.go:159] Load container "/syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root" "ci-gvisor-ptrace-direct-overlay-host-3"
D0301 09:07:23.574847   43320 container.go:592] Signal container "ci-gvisor-ptrace-direct-overlay-host-3": signal 0
D0301 09:07:23.574878   43320 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-direct-overlay-host-3"
D0301 09:07:23.574895   43320 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-3"
D0301 09:07:23.575028   43320 urpc.go:534] urpc: successfully marshalled 118 bytes.
I0301 09:07:23.857000   43320 debug.go:122] Found sandbox "ci-gvisor-ptrace-direct-overlay-host-3", PID: 40875
I0301 09:07:23.857059   43320 debug.go:131] Retrieving sandbox stacks
D0301 09:07:23.857088   43320 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-direct-overlay-host-3"
D0301 09:07:23.857161   43320 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-3"
W0301 09:07:23.857213   43320 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 40875: connection refused
retrieving stacks: connecting to control server at PID 40875: connection refused
W0301 09:07:23.857353   43320 main.go:338] Failure to execute command, err: 1