panic: runtime error: makeslice: len out of range
DIAGNOSIS:
I0316 21:21:20.911864   38805 main.go:305] ***************************
I0316 21:21:20.912039   38805 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-1]
I0316 21:21:20.914768   38805 main.go:307] Version release-20200219.0-179-g52758e16e0d1
I0316 21:21:20.914897   38805 main.go:308] PID: 38805
I0316 21:21:20.915006   38805 main.go:309] UID: 0, GID: 0
I0316 21:21:20.915100   38805 main.go:310] Configuration:
I0316 21:21:20.917313   38805 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0316 21:21:20.917464   38805 main.go:312] 		Platform: ptrace
I0316 21:21:20.917596   38805 main.go:313] 		FileAccess: shared, overlay: false
I0316 21:21:20.920439   38805 main.go:314] 		Network: sandbox, logging: false
I0316 21:21:20.920615   38805 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0316 21:21:20.920728   38805 main.go:316] ***************************
W0316 21:21:20.920843   38805 main.go:321] Block the TERM signal. This is only safe in tests!
D0316 21:21:20.934530   38805 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0316 21:21:21.066250   38805 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-1": signal 0
D0316 21:21:21.066477   38805 sandbox.go:814] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0316 21:21:21.066611   38805 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0316 21:21:21.071368   38805 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0316 21:21:23.743018   38805 debug.go:128] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1", PID: 4759
I0316 21:21:23.743156   38805 debug.go:137] Retrieving sandbox stacks
D0316 21:21:23.744480   38805 sandbox.go:932] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0316 21:21:23.744632   38805 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
W0316 21:21:23.744778   38805 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 4759: connection refused
retrieving stacks: connecting to control server at PID 4759: connection refused
W0316 21:21:23.745118   38805 main.go:338] Failure to execute command, err: 1