panic: munmap(7f33f0200000, 200000)) failed: function not implemented
DIAGNOSIS:
I0416 16:21:37.541614   16625 x:0] ***************************
I0416 16:21:37.541782   16625 x:0] Args: [/syzkaller/managers/ptrace-proxy-sandbox-race/current/image -root /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root -watchdog-action=panic -network=none -debug -platform=ptrace -file-access=shared -network=sandbox debug -stacks ci-gvisor-ptrace-proxy-sandbox-race-0]
I0416 16:21:37.541864   16625 x:0] Version release-20190304.1-116-g546a1df7d15f
I0416 16:21:37.541913   16625 x:0] PID: 16625
I0416 16:21:37.541941   16625 x:0] UID: 0, GID: 0
I0416 16:21:37.541970   16625 x:0] Configuration:
I0416 16:21:37.542018   16625 x:0] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0416 16:21:37.542083   16625 x:0] 		Platform: ptrace
I0416 16:21:37.542137   16625 x:0] 		FileAccess: shared, overlay: false
I0416 16:21:37.542176   16625 x:0] 		Network: sandbox, logging: false
I0416 16:21:37.542197   16625 x:0] 		Strace: false, max size: 1024, syscalls: []
I0416 16:21:37.542246   16625 x:0] ***************************
D0416 16:21:37.542317   16625 x:0] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0416 16:21:37.551046   16625 x:0] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-0": signal 0
D0416 16:21:37.551164   16625 x:0] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0416 16:21:37.551227   16625 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0416 16:21:37.552245   16625 x:0] urpc: successfully marshalled 117 bytes.
I0416 16:21:37.904522   16625 x:0] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0", PID: 36396
I0416 16:21:37.904652   16625 x:0] Retrieving sandbox stacks
D0416 16:21:37.904812   16625 x:0] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0416 16:21:37.904909   16625 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0416 16:21:37.905073   16625 x:0] urpc: successfully marshalled 36 bytes.
W0416 16:21:37.967436   16625 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0" stacks: urpc method "debug.Stacks" failed: connection reset by peer