panic: runtime error: makeslice: len out of range

DIAGNOSIS:
I0314 10:52:22.115585   28329 main.go:305] ***************************
I0314 10:52:22.115705   28329 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]
I0314 10:52:22.115941   28329 main.go:307] Version release-20200219.0-175-g829beebf0b67
I0314 10:52:22.116011   28329 main.go:308] PID: 28329
I0314 10:52:22.116097   28329 main.go:309] UID: 0, GID: 0
I0314 10:52:22.116185   28329 main.go:310] Configuration:
I0314 10:52:22.116296   28329 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0314 10:52:22.116378   28329 main.go:312] 		Platform: ptrace
I0314 10:52:22.116453   28329 main.go:313] 		FileAccess: shared, overlay: false
I0314 10:52:22.116576   28329 main.go:314] 		Network: sandbox, logging: false
I0314 10:52:22.116654   28329 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0314 10:52:22.116750   28329 main.go:316] ***************************
W0314 10:52:22.116826   28329 main.go:321] Block the TERM signal. This is only safe in tests!
D0314 10:52:22.116996   28329 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0314 10:52:22.123433   28329 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-0": signal 0
D0314 10:52:22.123591   28329 sandbox.go:814] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0314 10:52:22.123680   28329 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0314 10:52:22.124145   28329 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0314 10:52:22.301553   28329 debug.go:128] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0", PID: 23341
I0314 10:52:22.301745   28329 debug.go:137] Retrieving sandbox stacks
D0314 10:52:22.301865   28329 sandbox.go:932] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0314 10:52:22.302040   28329 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
W0314 10:52:22.302303   28329 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 23341: connection refused
retrieving stacks: connecting to control server at PID 23341: connection refused
W0314 10:52:22.302719   28329 main.go:338] Failure to execute command, err: 1