panic: munmap(7f05d5600000, 200000)) failed: function not implemented

goroutine 709607 [running]:
DIAGNOSIS:
I0519 21:11:44.743394   45147 x:0] ***************************
I0519 21:11:44.743445   45147 x:0] Args: [/syzkaller/managers/main/current/image -root /syzkaller/managers/main/workdir/gvisor_root -watchdog-action=panic -network=none -debug -platform=ptrace -file-access=shared -network=none debug -stacks ci-gvisor-main-2]
I0519 21:11:44.743467   45147 x:0] Version release-20190304.1-210-g4a842836e560
I0519 21:11:44.743471   45147 x:0] PID: 45147
I0519 21:11:44.743481   45147 x:0] UID: 0, GID: 0
I0519 21:11:44.743486   45147 x:0] Configuration:
I0519 21:11:44.743489   45147 x:0] 		RootDir: /syzkaller/managers/main/workdir/gvisor_root
I0519 21:11:44.743504   45147 x:0] 		Platform: ptrace
I0519 21:11:44.743532   45147 x:0] 		FileAccess: shared, overlay: false
I0519 21:11:44.743539   45147 x:0] 		Network: none, logging: false
I0519 21:11:44.743563   45147 x:0] 		Strace: false, max size: 1024, syscalls: []
I0519 21:11:44.743566   45147 x:0] ***************************
D0519 21:11:44.743590   45147 x:0] Load container "/syzkaller/managers/main/workdir/gvisor_root" "ci-gvisor-main-2"
D0519 21:11:44.745167   45147 x:0] Signal container "ci-gvisor-main-2": signal 0
D0519 21:11:44.745203   45147 x:0] Signal sandbox "ci-gvisor-main-2"
D0519 21:11:44.745208   45147 x:0] Connecting to sandbox "ci-gvisor-main-2"
D0519 21:11:44.745534   45147 x:0] urpc: successfully marshalled 96 bytes.
I0519 21:11:45.035937   45147 x:0] Found sandbox "ci-gvisor-main-2", PID: 20000
I0519 21:11:45.035963   45147 x:0] Retrieving sandbox stacks
D0519 21:11:45.035968   45147 x:0] Stacks sandbox "ci-gvisor-main-2"
D0519 21:11:45.035972   45147 x:0] Connecting to sandbox "ci-gvisor-main-2"
D0519 21:11:45.036070   45147 x:0] urpc: successfully marshalled 36 bytes.
W0519 21:11:45.144125   45147 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-main-2" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-main-2" stacks: urpc method "debug.Stacks" failed: connection reset by peer