panic: munmap(7f5c0f400000, 200000)) failed: function not implemented

goroutine 160 [running]:
DIAGNOSIS:
I0919 07:58:06.022963   48236 x:0] ***************************
I0919 07:58:06.023025   48236 x:0] Args: [/syzkaller/managers/main/current/image -root /syzkaller/managers/main/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=ptrace -file-access=shared -network=none debug -stacks ci-gvisor-main-0]
I0919 07:58:06.023044   48236 x:0] Version release-20190806.1-156-gc98e7f0d1947
I0919 07:58:06.023059   48236 x:0] PID: 48236
I0919 07:58:06.023067   48236 x:0] UID: 0, GID: 0
I0919 07:58:06.023072   48236 x:0] Configuration:
I0919 07:58:06.023078   48236 x:0] 		RootDir: /syzkaller/managers/main/workdir/gvisor_root
I0919 07:58:06.023083   48236 x:0] 		Platform: ptrace
I0919 07:58:06.023097   48236 x:0] 		FileAccess: shared, overlay: false
I0919 07:58:06.023115   48236 x:0] 		Network: none, logging: false
I0919 07:58:06.023122   48236 x:0] 		Strace: false, max size: 1024, syscalls: []
I0919 07:58:06.023127   48236 x:0] ***************************
D0919 07:58:06.023163   48236 x:0] Load container "/syzkaller/managers/main/workdir/gvisor_root" "ci-gvisor-main-0"
D0919 07:58:06.024724   48236 x:0] Signal container "ci-gvisor-main-0": signal 0
D0919 07:58:06.024754   48236 x:0] Signal sandbox "ci-gvisor-main-0"
D0919 07:58:06.024766   48236 x:0] Connecting to sandbox "ci-gvisor-main-0"
D0919 07:58:06.024890   48236 x:0] urpc: successfully marshalled 96 bytes.
I0919 07:58:06.246503   48236 x:0] Found sandbox "ci-gvisor-main-0", PID: 43990
I0919 07:58:06.246525   48236 x:0] Retrieving sandbox stacks
D0919 07:58:06.246531   48236 x:0] Stacks sandbox "ci-gvisor-main-0"
D0919 07:58:06.246536   48236 x:0] Connecting to sandbox "ci-gvisor-main-0"
D0919 07:58:06.246586   48236 x:0] urpc: successfully marshalled 36 bytes.
W0919 07:58:06.294475   48236 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-main-0" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-main-0" stacks: urpc method "debug.Stacks" failed: connection reset by peer
W0919 07:58:06.294559   48236 x:0] Failure to execute command, err: 1