panic: runtime error: makeslice: len out of range
DIAGNOSIS:
I0312 08:17:14.665303    3421 main.go:305] ***************************
I0312 08:17:14.665453    3421 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-2]
I0312 08:17:14.665651    3421 main.go:307] Version release-20200219.0-136-g24e7005ab6bd
I0312 08:17:14.665761    3421 main.go:308] PID: 3421
I0312 08:17:14.665877    3421 main.go:309] UID: 0, GID: 0
I0312 08:17:14.665972    3421 main.go:310] Configuration:
I0312 08:17:14.666059    3421 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0312 08:17:14.666151    3421 main.go:312] 		Platform: ptrace
I0312 08:17:14.666250    3421 main.go:313] 		FileAccess: shared, overlay: false
I0312 08:17:14.666379    3421 main.go:314] 		Network: sandbox, logging: false
I0312 08:17:14.666476    3421 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0312 08:17:14.666567    3421 main.go:316] ***************************
W0312 08:17:14.666674    3421 main.go:321] Block the TERM signal. This is only safe in tests!
D0312 08:17:14.666837    3421 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0312 08:17:14.673468    3421 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-2": signal 0
D0312 08:17:14.673626    3421 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0312 08:17:14.673718    3421 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0312 08:17:14.674156    3421 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0312 08:17:14.839461    3421 debug.go:128] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2", PID: 64116
I0312 08:17:14.839694    3421 debug.go:137] Retrieving sandbox stacks
D0312 08:17:14.839794    3421 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0312 08:17:14.839912    3421 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
W0312 08:17:14.840078    3421 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 64116: connection refused
retrieving stacks: connecting to control server at PID 64116: connection refused
W0312 08:17:14.840491    3421 main.go:338] Failure to execute command, err: 1