panic: munmap(600000, 200000)) failed: function not implemented

goroutine 2321743 [running]:
DIAGNOSIS:
I1204 23:36:21.272093   39315 x:0] ***************************
I1204 23:36:21.272108   39315 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-0]
I1204 23:36:21.272133   39315 x:0] Version release-20191114.0-60-g1eda90d08486
I1204 23:36:21.272138   39315 x:0] PID: 39315
I1204 23:36:21.272145   39315 x:0] UID: 0, GID: 0
I1204 23:36:21.272150   39315 x:0] Configuration:
I1204 23:36:21.272153   39315 x:0] 		RootDir: /syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root
I1204 23:36:21.272170   39315 x:0] 		Platform: ptrace
I1204 23:36:21.272183   39315 x:0] 		FileAccess: shared, overlay: false
I1204 23:36:21.272203   39315 x:0] 		Network: host, logging: false
I1204 23:36:21.272222   39315 x:0] 		Strace: false, max size: 1024, syscalls: []
I1204 23:36:21.272227   39315 x:0] ***************************
D1204 23:36:21.272451   39315 x:0] Load container "/syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root" "ci-gvisor-ptrace-direct-overlay-host-0"
D1204 23:36:21.275073   39315 x:0] Signal container "ci-gvisor-ptrace-direct-overlay-host-0": signal 0
D1204 23:36:21.275098   39315 x:0] Signal sandbox "ci-gvisor-ptrace-direct-overlay-host-0"
D1204 23:36:21.275111   39315 x:0] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-0"
D1204 23:36:21.275672   39315 x:0] urpc: successfully marshalled 118 bytes.
W1204 23:36:21.745672   39315 x:0] FATAL ERROR: container sandbox is not running
container sandbox is not running
W1204 23:36:21.745789   39315 x:0] Failure to execute command, err: 1