panic: ptrace status unexpected: got 31, wanted stopped

DIAGNOSIS:


Error collecting stacks: failed to run ["/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-1"]: exit status 128
I0305 14:58:25.122034   15210 x:0] ***************************
I0305 14:58:25.122104   15210 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-1]
I0305 14:58:25.122121   15210 x:0] Git Revision: dcb634ce73f51a1c32e1632d5b5011b3cf56a862
I0305 14:58:25.122126   15210 x:0] PID: 15210
I0305 14:58:25.122135   15210 x:0] UID: 0, GID: 0
I0305 14:58:25.122150   15210 x:0] Configuration:
I0305 14:58:25.122155   15210 x:0] 		RootDir: /syzkaller/managers/main/workdir/gvisor_root
I0305 14:58:25.122158   15210 x:0] 		Platform: ptrace
I0305 14:58:25.122170   15210 x:0] 		FileAccess: shared, overlay: false
I0305 14:58:25.122178   15210 x:0] 		Network: none, logging: false
I0305 14:58:25.122184   15210 x:0] 		Strace: false, max size: 1024, syscalls: []
I0305 14:58:25.122188   15210 x:0] ***************************
D0305 14:58:25.122206   15210 x:0] Load container "/syzkaller/managers/main/workdir/gvisor_root" "ci-gvisor-main-1"
D0305 14:58:25.125838   15210 x:0] Signal container "ci-gvisor-main-1": signal 0
D0305 14:58:25.125883   15210 x:0] Signal sandbox "ci-gvisor-main-1"
D0305 14:58:25.125937   15210 x:0] Connecting to sandbox "ci-gvisor-main-1"
D0305 14:58:25.126144   15210 x:0] urpc: successfully marshalled 96 bytes.
I0305 14:58:25.514835   15210 x:0] Found sandbox "ci-gvisor-main-1", PID: 38126
I0305 14:58:25.514852   15210 x:0] Retrieving sandbox stacks
D0305 14:58:25.514857   15210 x:0] Stacks sandbox "ci-gvisor-main-1"
D0305 14:58:25.514866   15210 x:0] Connecting to sandbox "ci-gvisor-main-1"
D0305 14:58:25.514929   15210 x:0] urpc: successfully marshalled 36 bytes.
W0305 14:58:25.598933   15210 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-main-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-main-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer
goroutine 5969669 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc000d4f3b0, 0x0, 0xb4ed)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x37c
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc000d4f3b0, 0xc001f5b618, 0xc001f5b7a8, 0x6, 0x6)
	pkg/sentry/platform/ptrace/subprocess.go:390 +0xb8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc000d4f3b0, 0xc000d4f3c0, 0x9, 0xc001f5b7a8, 0x6, 0x6, 0xc, 0xc001f5b7e8, 0x6f2e66)
	pkg/sentry/platform/ptrace/subprocess.go:428 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc0008ca140, 0x9, 0xc001f5b7a8, 0x6, 0x6, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).MapFile(0xc0008ca140, 0x2ae1fb822000, 0xc, 0x15af2000, 0x15b13000, 0x101, 0xc000194b00, 0xc)
	pkg/sentry/platform/ptrace/subprocess.go:571 +0xfc
gvisor.googlesource.com/gvisor/pkg/sentry/platform/filemem.(*FileMem).MapInto(0xc0002e0000, 0xdb87c0, 0xc0008ca140, 0x2ae1fb822000, 0x15af2000, 0x15b13000, 0x101, 0xc001f5b8c8, 0x6de341)
	pkg/sentry/platform/filemem/filemem.go:512 +0xea
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).mapASLocked(0xc001abd600, 0xc000194b00, 0xc, 0x2ae1fb822000, 0x2ae1fb843000, 0x2ae1fb822000, 0x2ae1fb843000, 0x0)
	pkg/sentry/mm/address_space.go:186 +0x1ac
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).populateVMAAndUnlock(0xc001abd600, 0xdb96c0, 0xc0050a4000, 0xc000f8c700, 0xb, 0x2ae1fb822000, 0x2ae1fb843000, 0x0)
	pkg/sentry/mm/syscalls.go:242 +0x202
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).MMap(0xc001abd600, 0xdb96c0, 0xc0050a4000, 0x21000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/mm/syscalls.go:158 +0x30f
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Mmap(0xc0050a4000, 0x0, 0x21000, 0x3, 0x20022, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_mmap.go:104 +0x28d
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0050a4000, 0x9, 0x0, 0x21000, 0x3, 0x20022, 0xffffffffffffffff, 0x0, 0xc001f5bd08, 0xc001f5bdc0, ...)
	pkg/sentry/kernel/task_syscall.go:165 +0x2fc
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0050a4000, 0x9, 0x0, 0x21000, 0x3, 0x20022, 0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0)
	pkg/sentry/kernel/task_syscall.go:283 +0x69
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0050a4000, 0x9, 0x0, 0x21000, 0x3, 0x20022, 0xffffffffffffffff, 0x0, 0xc00042e600, 0xdc8ee0)
	pkg/sentry/kernel/task_syscall.go:244 +0x96
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0050a4000, 0x2, 0xc0008ca140)
	pkg/sentry/kernel/task_syscall.go:219 +0x13d
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0050a4000, 0xda1780, 0x0)
	pkg/sentry/kernel/task_run.go:215 +0x105b
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc0050a4000, 0xf5aa)
	pkg/sentry/kernel/task_run.go:91 +0x194
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:279 +0xfe