panic: munmap(7f19ece00000, 200000)) failed: function not implemented

goroutine 433 [running]:
DIAGNOSIS:
I0103 18:15:39.284976   61059 x:0] ***************************
I0103 18:15:39.284988   61059 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 --ps ci-gvisor-main-3]
I0103 18:15:39.285008   61059 x:0] Version release-20191213.0-56-g1f384ac42b9e
I0103 18:15:39.285013   61059 x:0] PID: 61059
I0103 18:15:39.285019   61059 x:0] UID: 0, GID: 0
I0103 18:15:39.285023   61059 x:0] Configuration:
I0103 18:15:39.285029   61059 x:0] 		RootDir: /syzkaller/managers/main/workdir/gvisor_root
I0103 18:15:39.285032   61059 x:0] 		Platform: ptrace
I0103 18:15:39.285036   61059 x:0] 		FileAccess: shared, overlay: false
I0103 18:15:39.285043   61059 x:0] 		Network: none, logging: false
I0103 18:15:39.285048   61059 x:0] 		Strace: false, max size: 1024, syscalls: []
I0103 18:15:39.285052   61059 x:0] ***************************
D0103 18:15:39.285081   61059 x:0] Load container "/syzkaller/managers/main/workdir/gvisor_root" "ci-gvisor-main-3"
D0103 18:15:39.286569   61059 x:0] Signal container "ci-gvisor-main-3": signal 0
D0103 18:15:39.286586   61059 x:0] Signal sandbox "ci-gvisor-main-3"
D0103 18:15:39.286595   61059 x:0] Connecting to sandbox "ci-gvisor-main-3"
D0103 18:15:39.286801   61059 x:0] urpc: successfully marshalled 96 bytes.
I0103 18:15:39.585614   61059 x:0] Found sandbox "ci-gvisor-main-3", PID: 45672
I0103 18:15:39.585640   61059 x:0] Retrieving sandbox stacks
D0103 18:15:39.585645   61059 x:0] Stacks sandbox "ci-gvisor-main-3"
D0103 18:15:39.585651   61059 x:0] Connecting to sandbox "ci-gvisor-main-3"
D0103 18:15:39.585705   61059 x:0] urpc: successfully marshalled 36 bytes.
W0103 18:15:39.632785   61059 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
W0103 18:15:39.632941   61059 x:0] Failure to execute command, err: 1