panic: munmap(7f9df7800000, 200000)) failed: function not implemented

goroutine 3603240 [running]:
DIAGNOSIS:


Error collecting stacks: failed to run ["/syzkaller/managers/ptrace-direct-overlay-host/current/image" "-root" "/syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root" "-watchdog-action=panic" "-network=none" "-debug" "-platform=ptrace" "-file-access=shared" "-network=host" "debug" "-stacks" "ci-gvisor-ptrace-direct-overlay-host-0"]: exit status 128
I0222 08:54:06.309584   50408 x:0] ***************************
I0222 08:54:06.309641   50408 x:0] Args: [/syzkaller/managers/ptrace-direct-overlay-host/current/image -root /syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root -watchdog-action=panic -network=none -debug -platform=ptrace -file-access=shared -network=host debug -stacks ci-gvisor-ptrace-direct-overlay-host-0]
I0222 08:54:06.309657   50408 x:0] Git Revision: 532f4b2fbaf66382a3d9e118b5a7a3ee272c8edc
I0222 08:54:06.309662   50408 x:0] PID: 50408
I0222 08:54:06.309669   50408 x:0] UID: 0, GID: 0
I0222 08:54:06.309683   50408 x:0] Configuration:
I0222 08:54:06.309687   50408 x:0] 		RootDir: /syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root
I0222 08:54:06.309690   50408 x:0] 		Platform: ptrace
I0222 08:54:06.309697   50408 x:0] 		FileAccess: shared, overlay: false
I0222 08:54:06.309709   50408 x:0] 		Network: host, logging: false
I0222 08:54:06.309715   50408 x:0] 		Strace: false, max size: 1024, syscalls: []
I0222 08:54:06.309720   50408 x:0] ***************************
D0222 08:54:06.309795   50408 x:0] Load container "/syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root" "ci-gvisor-ptrace-direct-overlay-host-0"
D0222 08:54:06.311348   50408 x:0] Signal container "ci-gvisor-ptrace-direct-overlay-host-0": signal 0
D0222 08:54:06.311372   50408 x:0] Signal sandbox "ci-gvisor-ptrace-direct-overlay-host-0"
D0222 08:54:06.311379   50408 x:0] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-0"
D0222 08:54:06.311800   50408 x:0] urpc: successfully marshalled 118 bytes.
I0222 08:54:06.762765   50408 x:0] Found sandbox "ci-gvisor-ptrace-direct-overlay-host-0", PID: 33872
I0222 08:54:06.762811   50408 x:0] Retrieving sandbox stacks
D0222 08:54:06.762816   50408 x:0] Stacks sandbox "ci-gvisor-ptrace-direct-overlay-host-0"
D0222 08:54:06.762821   50408 x:0] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-0"
D0222 08:54:06.762884   50408 x:0] urpc: successfully marshalled 36 bytes.
W0222 08:54:06.831199   50408 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-ptrace-direct-overlay-host-0" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-ptrace-direct-overlay-host-0" stacks: urpc method "debug.Stacks" failed: connection reset by peer
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).Unmap(0xc00076cbc0, 0x7f9df7800000, 0x200000)
	pkg/sentry/platform/ptrace/subprocess.go:608 +0x390
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).unmapASLocked(0xc0001b2380, 0x7f9df7800000, 0x7f9df7a00000)
	pkg/sentry/mm/address_space.go:215 +0x73
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).breakCopyOnWriteLocked(0xc0001b2380, 0xc0001b2a70, 0x6, 0x7f9df798b000, 0x7f9df798c000, 0x7f9df798b000, 0x7f9df798c000, 0xc0001b2a70, 0x6, 0xc0001b2a70)
	pkg/sentry/mm/pma.go:457 +0x906
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).getPMAsLocked(0xc0001b2380, 0xd698a0, 0xc0011f4000, 0xc0001b23f0, 0xa, 0x7f9df798b000, 0x7f9df798c000, 0x1, 0xc0001b23f0, 0xb, ...)
	pkg/sentry/mm/pma.go:146 +0x2e2
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).HandleUserFault(0xc0001b2380, 0xd698a0, 0xc0011f4000, 0x7f9df798ba78, 0x101, 0x7f9df798ba80, 0x0, 0x101)
	pkg/sentry/mm/syscalls.go:57 +0x19d
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0011f4000, 0xd5c980, 0x0)
	pkg/sentry/kernel/task_run.go:251 +0x77b
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc0011f4000, 0xe524)
	pkg/sentry/kernel/task_run.go:91 +0x149
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:279 +0xfe