panic: Stack for running G's are skipped while panicking.
Watchdog goroutine is stuck:
DIAGNOSIS:
I0302 04:52:01.206848    7640 main.go:305] ***************************
I0302 04:52:01.207026    7640 main.go:306] Args: [/syzkaller/managers/ptrace-proxy-sandbox-race/current/image -root /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=ptrace -file-access=shared -network=sandbox -TESTONLY-unsafe-nonroot debug -stacks --ps ci-gvisor-ptrace-proxy-sandbox-race-3]
I0302 04:52:01.207256    7640 main.go:307] Version release-20200219.0-72-gce4d1e45bb88
I0302 04:52:01.207379    7640 main.go:308] PID: 7640
I0302 04:52:01.207509    7640 main.go:309] UID: 0, GID: 0
I0302 04:52:01.207649    7640 main.go:310] Configuration:
I0302 04:52:01.207827    7640 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0302 04:52:01.207947    7640 main.go:312] 		Platform: ptrace
I0302 04:52:01.208060    7640 main.go:313] 		FileAccess: shared, overlay: false
I0302 04:52:01.208217    7640 main.go:314] 		Network: sandbox, logging: false
I0302 04:52:01.208348    7640 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0302 04:52:01.208472    7640 main.go:316] ***************************
W0302 04:52:01.208625    7640 main.go:321] Block the TERM signal. This is only safe in tests!
D0302 04:52:01.208915    7640 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0302 04:52:01.225128    7640 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-3": signal 0
D0302 04:52:01.225402    7640 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0302 04:52:01.225538    7640 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0302 04:52:01.226344    7640 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0302 04:52:09.866572    7640 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3", PID: 22665
I0302 04:52:09.866717    7640 debug.go:131] Retrieving sandbox stacks
D0302 04:52:09.866819    7640 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0302 04:52:09.866934    7640 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
W0302 04:52:09.867133    7640 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 22665: connection refused
retrieving stacks: connecting to control server at PID 22665: connection refused
W0302 04:52:09.867460    7640 main.go:338] Failure to execute command, err: 1