panic: munmap(600000, 200000)) failed: function not implemented
DIAGNOSIS:
I0725 18:41:55.986878   60889 x:0] ***************************
I0725 18:41:55.986952   60889 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]
I0725 18:41:55.986973   60889 x:0] Version release-20190529.1-267-g40e682759fd6
I0725 18:41:55.986979   60889 x:0] PID: 60889
I0725 18:41:55.986986   60889 x:0] UID: 0, GID: 0
I0725 18:41:55.986990   60889 x:0] Configuration:
I0725 18:41:55.987016   60889 x:0] 		RootDir: /syzkaller/managers/main/workdir/gvisor_root
I0725 18:41:55.987027   60889 x:0] 		Platform: ptrace
I0725 18:41:55.987033   60889 x:0] 		FileAccess: shared, overlay: false
I0725 18:41:55.987051   60889 x:0] 		Network: none, logging: false
I0725 18:41:55.987064   60889 x:0] 		Strace: false, max size: 1024, syscalls: []
I0725 18:41:55.987069   60889 x:0] ***************************
D0725 18:41:55.987107   60889 x:0] Load container "/syzkaller/managers/main/workdir/gvisor_root" "ci-gvisor-main-3"
D0725 18:41:55.989375   60889 x:0] Signal container "ci-gvisor-main-3": signal 0
D0725 18:41:55.989410   60889 x:0] Signal sandbox "ci-gvisor-main-3"
D0725 18:41:55.989429   60889 x:0] Connecting to sandbox "ci-gvisor-main-3"
D0725 18:41:55.989716   60889 x:0] urpc: successfully marshalled 96 bytes.
I0725 18:41:56.529941   60889 x:0] Found sandbox "ci-gvisor-main-3", PID: 8680
I0725 18:41:56.529974   60889 x:0] Retrieving sandbox stacks
D0725 18:41:56.529982   60889 x:0] Stacks sandbox "ci-gvisor-main-3"
D0725 18:41:56.529995   60889 x:0] Connecting to sandbox "ci-gvisor-main-3"
D0725 18:41:56.530070   60889 x:0] urpc: successfully marshalled 36 bytes.
W0725 18:41:56.639311   60889 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
W0725 18:41:56.639432   60889 x:0] Failure to execute command, err: 1