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

goroutine 5795984 [running]:
DIAGNOSIS:
I0724 09:49:57.785391   39195 x:0] ***************************
I0724 09:49:57.785453   39195 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-2]
I0724 09:49:57.785469   39195 x:0] Version release-20190529.1-266-g7e38d6433346
I0724 09:49:57.785474   39195 x:0] PID: 39195
I0724 09:49:57.785484   39195 x:0] UID: 0, GID: 0
I0724 09:49:57.785487   39195 x:0] Configuration:
I0724 09:49:57.785491   39195 x:0] 		RootDir: /syzkaller/managers/main/workdir/gvisor_root
I0724 09:49:57.785494   39195 x:0] 		Platform: ptrace
I0724 09:49:57.785497   39195 x:0] 		FileAccess: shared, overlay: false
I0724 09:49:57.785510   39195 x:0] 		Network: none, logging: false
I0724 09:49:57.785516   39195 x:0] 		Strace: false, max size: 1024, syscalls: []
I0724 09:49:57.785523   39195 x:0] ***************************
D0724 09:49:57.786365   39195 x:0] Load container "/syzkaller/managers/main/workdir/gvisor_root" "ci-gvisor-main-2"
D0724 09:49:57.787941   39195 x:0] Signal container "ci-gvisor-main-2": signal 0
D0724 09:49:57.787961   39195 x:0] Signal sandbox "ci-gvisor-main-2"
D0724 09:49:57.787967   39195 x:0] Connecting to sandbox "ci-gvisor-main-2"
D0724 09:49:57.788570   39195 x:0] urpc: successfully marshalled 96 bytes.
W0724 09:49:58.679552   39195 x:0] FATAL ERROR: container sandbox is not running
container sandbox is not running
W0724 09:49:58.679651   39195 x:0] Failure to execute command, err: 1