panic: munmap(7f30a0200000, 200000)) failed: function not implemented
DIAGNOSIS:
I0914 05:17:27.277698   62948 x:0] ***************************
I0914 05:17:27.277847   62948 x:0] 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 ci-gvisor-ptrace-proxy-sandbox-race-1]
I0914 05:17:27.277990   62948 x:0] Version release-20190806.1-144-g2bbf73d9ed85
I0914 05:17:27.278021   62948 x:0] PID: 62948
I0914 05:17:27.278056   62948 x:0] UID: 0, GID: 0
I0914 05:17:27.278135   62948 x:0] Configuration:
I0914 05:17:27.278171   62948 x:0] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0914 05:17:27.278210   62948 x:0] 		Platform: ptrace
I0914 05:17:27.278268   62948 x:0] 		FileAccess: shared, overlay: false
I0914 05:17:27.278320   62948 x:0] 		Network: sandbox, logging: false
I0914 05:17:27.278367   62948 x:0] 		Strace: false, max size: 1024, syscalls: []
I0914 05:17:27.278415   62948 x:0] ***************************
W0914 05:17:27.278469   62948 x:0] Block the TERM signal. This is only safe in tests!
D0914 05:17:27.278603   62948 x:0] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0914 05:17:27.285952   62948 x:0] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-1": signal 0
D0914 05:17:27.286086   62948 x:0] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0914 05:17:27.286227   62948 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0914 05:17:27.287129   62948 x:0] urpc: successfully marshalled 117 bytes.
I0914 05:17:27.722773   62948 x:0] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1", PID: 53497
I0914 05:17:27.722867   62948 x:0] Retrieving sandbox stacks
D0914 05:17:27.722902   62948 x:0] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0914 05:17:27.722962   62948 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0914 05:17:27.723087   62948 x:0] urpc: successfully marshalled 36 bytes.
W0914 05:17:27.804378   62948 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer
W0914 05:17:27.804657   62948 x:0] Failure to execute command, err: 1