panic: munmap(7f58a5400000, 200000)) failed: function not implemented

goroutine 3851100 [running]:
DIAGNOSIS:
I1110 05:22:20.157226   23501 x:0] ***************************
I1110 05:22:20.157284   23501 x:0] Args: [/syzkaller/managers/ptrace-direct-overlay-host/current/image -root /syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=ptrace -file-access=shared -network=host debug -stacks ci-gvisor-ptrace-direct-overlay-host-2]
I1110 05:22:20.157302   23501 x:0] Version release-20190806.1-388-g833dbba70dbc
I1110 05:22:20.157307   23501 x:0] PID: 23501
I1110 05:22:20.157315   23501 x:0] UID: 0, GID: 0
I1110 05:22:20.157324   23501 x:0] Configuration:
I1110 05:22:20.157328   23501 x:0] 		RootDir: /syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root
I1110 05:22:20.157336   23501 x:0] 		Platform: ptrace
I1110 05:22:20.157340   23501 x:0] 		FileAccess: shared, overlay: false
I1110 05:22:20.157348   23501 x:0] 		Network: host, logging: false
I1110 05:22:20.157359   23501 x:0] 		Strace: false, max size: 1024, syscalls: []
I1110 05:22:20.157363   23501 x:0] ***************************
D1110 05:22:20.157398   23501 x:0] Load container "/syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root" "ci-gvisor-ptrace-direct-overlay-host-2"
D1110 05:22:20.158935   23501 x:0] Signal container "ci-gvisor-ptrace-direct-overlay-host-2": signal 0
D1110 05:22:20.158962   23501 x:0] Signal sandbox "ci-gvisor-ptrace-direct-overlay-host-2"
D1110 05:22:20.158968   23501 x:0] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-2"
D1110 05:22:20.159125   23501 x:0] urpc: successfully marshalled 118 bytes.
I1110 05:22:20.560912   23501 x:0] Found sandbox "ci-gvisor-ptrace-direct-overlay-host-2", PID: 57031
I1110 05:22:20.560928   23501 x:0] Retrieving sandbox stacks
D1110 05:22:20.560932   23501 x:0] Stacks sandbox "ci-gvisor-ptrace-direct-overlay-host-2"
D1110 05:22:20.560943   23501 x:0] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-2"
D1110 05:22:20.560990   23501 x:0] urpc: successfully marshalled 36 bytes.
W1110 05:22:20.616440   23501 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-ptrace-direct-overlay-host-2" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-ptrace-direct-overlay-host-2" stacks: urpc method "debug.Stacks" failed: connection reset by peer
W1110 05:22:20.616561   23501 x:0] Failure to execute command, err: 1