panic: munmap(7f71e8200000, 200000)) failed: function not implemented

goroutine 721461 [running]:
DIAGNOSIS:
I0813 22:25:08.942689   40288 x:0] ***************************
I0813 22:25:08.942743   40288 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-3]
I0813 22:25:08.942757   40288 x:0] Version release-20190529.1-337-g9769a8eaa4b3
I0813 22:25:08.942762   40288 x:0] PID: 40288
I0813 22:25:08.942768   40288 x:0] UID: 0, GID: 0
I0813 22:25:08.942771   40288 x:0] Configuration:
I0813 22:25:08.942774   40288 x:0] 		RootDir: /syzkaller/managers/main/workdir/gvisor_root
I0813 22:25:08.942778   40288 x:0] 		Platform: ptrace
I0813 22:25:08.942783   40288 x:0] 		FileAccess: shared, overlay: false
I0813 22:25:08.942796   40288 x:0] 		Network: none, logging: false
I0813 22:25:08.942802   40288 x:0] 		Strace: false, max size: 1024, syscalls: []
I0813 22:25:08.942806   40288 x:0] ***************************
D0813 22:25:08.942829   40288 x:0] Load container "/syzkaller/managers/main/workdir/gvisor_root" "ci-gvisor-main-3"
D0813 22:25:08.944224   40288 x:0] Signal container "ci-gvisor-main-3": signal 0
D0813 22:25:08.944251   40288 x:0] Signal sandbox "ci-gvisor-main-3"
D0813 22:25:08.944258   40288 x:0] Connecting to sandbox "ci-gvisor-main-3"
D0813 22:25:08.945299   40288 x:0] urpc: successfully marshalled 96 bytes.
I0813 22:25:09.237351   40288 x:0] Found sandbox "ci-gvisor-main-3", PID: 30301
I0813 22:25:09.237387   40288 x:0] Retrieving sandbox stacks
D0813 22:25:09.237395   40288 x:0] Stacks sandbox "ci-gvisor-main-3"
D0813 22:25:09.237411   40288 x:0] Connecting to sandbox "ci-gvisor-main-3"
D0813 22:25:09.237516   40288 x:0] urpc: successfully marshalled 36 bytes.
W0813 22:25:09.298559   40288 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-main-3" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-main-3" stacks: urpc method "debug.Stacks" failed: connection reset by peer
W0813 22:25:09.298690   40288 x:0] Failure to execute command, err: 1