panic: runtime error: makeslice: len out of range
DIAGNOSIS:
I0314 13:03:31.783554   63817 main.go:305] ***************************
I0314 13:03:31.783798   63817 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]
I0314 13:03:31.784099   63817 main.go:307] Version release-20200219.0-175-g829beebf0b67
I0314 13:03:31.784262   63817 main.go:308] PID: 63817
I0314 13:03:31.784427   63817 main.go:309] UID: 0, GID: 0
I0314 13:03:31.784618   63817 main.go:310] Configuration:
I0314 13:03:31.784817   63817 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0314 13:03:31.784992   63817 main.go:312] 		Platform: ptrace
I0314 13:03:31.785145   63817 main.go:313] 		FileAccess: shared, overlay: false
I0314 13:03:31.785367   63817 main.go:314] 		Network: sandbox, logging: false
I0314 13:03:31.785542   63817 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0314 13:03:31.785728   63817 main.go:316] ***************************
W0314 13:03:31.785882   63817 main.go:321] Block the TERM signal. This is only safe in tests!
D0314 13:03:31.786132   63817 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0314 13:03:31.793176   63817 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-3": signal 0
D0314 13:03:31.793389   63817 sandbox.go:814] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0314 13:03:31.793540   63817 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0314 13:03:31.794118   63817 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0314 13:03:31.983125   63817 debug.go:128] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3", PID: 40179
I0314 13:03:31.983343   63817 debug.go:137] Retrieving sandbox stacks
D0314 13:03:31.983468   63817 sandbox.go:932] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0314 13:03:31.983613   63817 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
W0314 13:03:31.983834   63817 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 40179: connection refused
retrieving stacks: connecting to control server at PID 40179: connection refused
W0314 13:03:31.984259   63817 main.go:338] Failure to execute command, err: 1