panic: ptrace status unexpected: got 31, wanted stopped

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-1"]: exit status 128
I0106 19:45:15.665248    9684 x:0] ***************************
I0106 19:45:15.665324    9684 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-1]
I0106 19:45:15.665343    9684 x:0] Git Revision: 4a4cc7dc3794535f3d65736cde4293ecf0e565e0
I0106 19:45:15.665349    9684 x:0] PID: 9684
I0106 19:45:15.665367    9684 x:0] UID: 0, GID: 0
I0106 19:45:15.665370    9684 x:0] Configuration:
I0106 19:45:15.665373    9684 x:0] 		RootDir: /syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root
I0106 19:45:15.665376    9684 x:0] 		Platform: ptrace
I0106 19:45:15.665383    9684 x:0] 		FileAccess: shared, overlay: false
I0106 19:45:15.665390    9684 x:0] 		Network: host, logging: false
I0106 19:45:15.665396    9684 x:0] 		Strace: false, max size: 1024, syscalls: []
I0106 19:45:15.665399    9684 x:0] ***************************
D0106 19:45:15.665415    9684 x:0] Load container "/syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root" "ci-gvisor-ptrace-direct-overlay-host-1"
D0106 19:45:15.666052    9684 x:0] Signal container "ci-gvisor-ptrace-direct-overlay-host-1": signal 0
D0106 19:45:15.666073    9684 x:0] Signal sandbox "ci-gvisor-ptrace-direct-overlay-host-1"
D0106 19:45:15.666078    9684 x:0] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-1"
D0106 19:45:15.666388    9684 x:0] urpc: successfully marshalled 118 bytes.
I0106 19:45:16.290651    9684 x:0] Found sandbox "ci-gvisor-ptrace-direct-overlay-host-1", PID: 52866
I0106 19:45:16.290674    9684 x:0] Retrieving sandbox stacks
D0106 19:45:16.290679    9684 x:0] Stacks sandbox "ci-gvisor-ptrace-direct-overlay-host-1"
D0106 19:45:16.290683    9684 x:0] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-1"
D0106 19:45:16.290737    9684 x:0] urpc: successfully marshalled 36 bytes.
W0106 19:45:16.363184    9684 x:0] FATAL ERROR: error retrieving stacks: err getting sandbox "ci-gvisor-ptrace-direct-overlay-host-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer
error retrieving stacks: err getting sandbox "ci-gvisor-ptrace-direct-overlay-host-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer
goroutine 2964879 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc00147c5a0, 0x0, 0xe828)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x3fb
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc00147c5a0, 0xc001d89820, 0xc001d899b8, 0x2, 0x2)
	pkg/sentry/platform/ptrace/subprocess.go:390 +0xc3
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc00147c5a0, 0xc00147c5b0, 0xb, 0xc001d899b8, 0x2, 0x2, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:428 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc000730000, 0xb, 0xc001d899b8, 0x2, 0x2, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).Unmap(0xc000730000, 0x2ad98cfb4000, 0x1000)
	pkg/sentry/platform/ptrace/subprocess.go:602 +0x22e
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).unmapASLocked(0xc0016bc380, 0x2ad98cfb4000, 0x2ad98cfb5000)
	pkg/sentry/mm/address_space.go:215 +0x73
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).MProtect(0xc0016bc380, 0x2ad98cfb4000, 0x1000, 0xc000000000, 0x0, 0x0)
	pkg/sentry/mm/syscalls.go:657 +0x44a
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Mprotect(0xc001b32a80, 0x2ad98cfb4000, 0x1000, 0x0, 0x20022, 0x1, 0x1, 0x9363f4, 0xc001d89c48, 0xc001d89dd0, ...)
	pkg/sentry/syscalls/linux/sys_mmap.go:151 +0x73
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc001b32a80, 0xa, 0x2ad98cfb4000, 0x1000, 0x0, 0x20022, 0x1, 0x1, 0x2ad98cfb4000, 0xc40c20, ...)
	pkg/sentry/kernel/task_syscall.go:165 +0x30a
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc001b32a80, 0xa, 0x2ad98cfb4000, 0x1000, 0x0, 0x20022, 0x1, 0x1, 0x1, 0x1)
	pkg/sentry/kernel/task_syscall.go:283 +0x69
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc001b32a80, 0xa, 0x2ad98cfb4000, 0x1000, 0x0, 0x20022, 0x1, 0x1, 0xd1cc20, 0xc001d89e58)
	pkg/sentry/kernel/task_syscall.go:244 +0x99
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc001b32a80, 0x2, 0xc000730000)
	pkg/sentry/kernel/task_syscall.go:219 +0x142
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc001b32a80, 0xd1cc20, 0x0)
	pkg/sentry/kernel/task_run.go:215 +0xfda
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc001b32a80, 0xd415)
	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