panic: munmap(7f08f5800000, 200000)) failed: function not implemented

goroutine 530 [running]:
DIAGNOSIS:
I1013 03:15:05.460725   23003 x:0] ***************************
I1013 03:15:05.460918   23003 x:0] Args: [/syzkaller/managers/ptrace-direct-overlay-host-race/current/image -root /syzkaller/managers/ptrace-direct-overlay-host-race/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=ptrace -file-access=exclusive -overlay -network=host -TESTONLY-unsafe-nonroot debug -stacks ci-gvisor-ptrace-direct-overlay-host-race-1]
I1013 03:15:05.461013   23003 x:0] Version release-20190806.1-263-g470997ca9990
I1013 03:15:05.461040   23003 x:0] PID: 23003
I1013 03:15:05.461072   23003 x:0] UID: 0, GID: 0
I1013 03:15:05.461101   23003 x:0] Configuration:
I1013 03:15:05.461130   23003 x:0] 		RootDir: /syzkaller/managers/ptrace-direct-overlay-host-race/workdir/gvisor_root
I1013 03:15:05.461163   23003 x:0] 		Platform: ptrace
I1013 03:15:05.461200   23003 x:0] 		FileAccess: exclusive, overlay: true
I1013 03:15:05.461248   23003 x:0] 		Network: host, logging: false
I1013 03:15:05.461286   23003 x:0] 		Strace: false, max size: 1024, syscalls: []
I1013 03:15:05.461329   23003 x:0] ***************************
W1013 03:15:05.461356   23003 x:0] Block the TERM signal. This is only safe in tests!
D1013 03:15:05.461464   23003 x:0] Load container "/syzkaller/managers/ptrace-direct-overlay-host-race/workdir/gvisor_root" "ci-gvisor-ptrace-direct-overlay-host-race-1"
D1013 03:15:05.468308   23003 x:0] Signal container "ci-gvisor-ptrace-direct-overlay-host-race-1": signal 0
D1013 03:15:05.468417   23003 x:0] Signal sandbox "ci-gvisor-ptrace-direct-overlay-host-race-1"
D1013 03:15:05.468476   23003 x:0] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-race-1"
D1013 03:15:05.469028   23003 x:0] urpc: successfully marshalled 123 bytes.
I1013 03:15:05.751593   23003 x:0] Found sandbox "ci-gvisor-ptrace-direct-overlay-host-race-1", PID: 21540
I1013 03:15:05.751702   23003 x:0] Retrieving sandbox stacks
D1013 03:15:05.752637   23003 x:0] Stacks sandbox "ci-gvisor-ptrace-direct-overlay-host-race-1"
D1013 03:15:05.752712   23003 x:0] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-race-1"
D1013 03:15:05.752852   23003 x:0] urpc: successfully marshalled 36 bytes.
W1013 03:15:05.816700   23003 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-ptrace-direct-overlay-host-race-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-ptrace-direct-overlay-host-race-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer
W1013 03:15:05.817043   23003 x:0] Failure to execute command, err: 1