fatal error: too many address space collisions for -race mode
DIAGNOSIS:
I0321 12:23:52.529909    7173 main.go:305] ***************************
I0321 12:23:52.530079    7173 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]
I0321 12:23:52.530275    7173 main.go:307] Version release-20200219.0-214-gd5fe1ce0c1c5
I0321 12:23:52.530359    7173 main.go:308] PID: 7173
I0321 12:23:52.530447    7173 main.go:309] UID: 0, GID: 0
I0321 12:23:52.530515    7173 main.go:310] Configuration:
I0321 12:23:52.530592    7173 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0321 12:23:52.530683    7173 main.go:312] 		Platform: ptrace
I0321 12:23:52.530788    7173 main.go:313] 		FileAccess: shared, overlay: false
I0321 12:23:52.530913    7173 main.go:314] 		Network: sandbox, logging: false
I0321 12:23:52.530985    7173 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0321 12:23:52.531068    7173 main.go:316] ***************************
W0321 12:23:52.531154    7173 main.go:321] Block the TERM signal. This is only safe in tests!
D0321 12:23:52.531332    7173 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0321 12:23:52.540776    7173 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-2": signal 0
D0321 12:23:52.540923    7173 sandbox.go:814] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0321 12:23:52.541043    7173 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0321 12:23:52.541426    7173 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0321 12:23:52.681212    7173 debug.go:128] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2", PID: 5513
I0321 12:23:52.681414    7173 debug.go:137] Retrieving sandbox stacks
D0321 12:23:52.681515    7173 sandbox.go:932] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0321 12:23:52.681615    7173 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
W0321 12:23:52.681799    7173 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 5513: connection refused
retrieving stacks: connecting to control server at PID 5513: connection refused
W0321 12:23:52.683306    7173 main.go:338] Failure to execute command, err: 1