fatal error: too many address space collisions for -race mode
DIAGNOSIS:
I0312 07:08:30.785833    5865 main.go:305] ***************************
I0312 07:08:30.785947    5865 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 07:08:30.786139    5865 main.go:307] Version release-20200219.0-136-g24e7005ab6bd
I0312 07:08:30.786230    5865 main.go:308] PID: 5865
I0312 07:08:30.786370    5865 main.go:309] UID: 0, GID: 0
I0312 07:08:30.786442    5865 main.go:310] Configuration:
I0312 07:08:30.786517    5865 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0312 07:08:30.786611    5865 main.go:312] 		Platform: ptrace
I0312 07:08:30.786696    5865 main.go:313] 		FileAccess: shared, overlay: false
I0312 07:08:30.786777    5865 main.go:314] 		Network: sandbox, logging: false
I0312 07:08:30.786860    5865 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0312 07:08:30.786931    5865 main.go:316] ***************************
W0312 07:08:30.786990    5865 main.go:321] Block the TERM signal. This is only safe in tests!
D0312 07:08:30.787150    5865 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0312 07:08:30.792764    5865 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-2": signal 0
D0312 07:08:30.792899    5865 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0312 07:08:30.793004    5865 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0312 07:08:30.793361    5865 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0312 07:08:30.913678    5865 debug.go:128] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2", PID: 2887
I0312 07:08:30.913850    5865 debug.go:137] Retrieving sandbox stacks
D0312 07:08:30.913971    5865 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0312 07:08:30.914074    5865 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
W0312 07:08:30.914310    5865 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 2887: connection refused
retrieving stacks: connecting to control server at PID 2887: connection refused
W0312 07:08:30.914678    5865 main.go:338] Failure to execute command, err: 1