panic: Watchdog goroutine is stuck:
Stack for running G's are skipped while panicking.

DIAGNOSIS:
I0313 04:04:50.214055   21492 main.go:305] ***************************
I0313 04:04:50.214287   21492 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-0]
I0313 04:04:50.214514   21492 main.go:307] Version release-20200219.0-158-g919664600d8d
I0313 04:04:50.214681   21492 main.go:308] PID: 21492
I0313 04:04:50.214816   21492 main.go:309] UID: 0, GID: 0
I0313 04:04:50.214944   21492 main.go:310] Configuration:
I0313 04:04:50.215076   21492 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0313 04:04:50.215350   21492 main.go:312] 		Platform: ptrace
I0313 04:04:50.215471   21492 main.go:313] 		FileAccess: shared, overlay: false
I0313 04:04:50.215647   21492 main.go:314] 		Network: sandbox, logging: false
I0313 04:04:50.215776   21492 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0313 04:04:50.215892   21492 main.go:316] ***************************
W0313 04:04:50.216000   21492 main.go:321] Block the TERM signal. This is only safe in tests!
D0313 04:04:50.218207   21492 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0313 04:04:50.240315   21492 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-0": signal 0
D0313 04:04:50.240664   21492 sandbox.go:814] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0313 04:04:50.240808   21492 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0313 04:04:50.243366   21492 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0313 04:04:52.389155   21492 debug.go:128] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0", PID: 53298
I0313 04:04:52.389324   21492 debug.go:137] Retrieving sandbox stacks
D0313 04:04:52.389438   21492 sandbox.go:932] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0313 04:04:52.389559   21492 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0313 04:04:52.389774   21492 urpc.go:534] urpc: successfully marshalled 36 bytes.
W0313 04:04:52.509863   21492 error.go:48] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0" stacks: urpc method "debug.Stacks" failed: connection reset by peer
W0313 04:04:52.510391   21492 main.go:338] Failure to execute command, err: 1