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-0"]: exit status 128
I0304 13:48:35.967563   10261 x:0] ***************************
I0304 13:48:35.967626   10261 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-0]
I0304 13:48:35.967640   10261 x:0] Git Revision: d811c1016d090ea88a687bd9bef4951dc08b391d
I0304 13:48:35.967645   10261 x:0] PID: 10261
I0304 13:48:35.967652   10261 x:0] UID: 0, GID: 0
I0304 13:48:35.967655   10261 x:0] Configuration:
I0304 13:48:35.967665   10261 x:0] 		RootDir: /syzkaller/managers/main/workdir/gvisor_root
I0304 13:48:35.967669   10261 x:0] 		Platform: ptrace
I0304 13:48:35.967684   10261 x:0] 		FileAccess: shared, overlay: false
I0304 13:48:35.967690   10261 x:0] 		Network: none, logging: false
I0304 13:48:35.967695   10261 x:0] 		Strace: false, max size: 1024, syscalls: []
I0304 13:48:35.967700   10261 x:0] ***************************
D0304 13:48:35.967715   10261 x:0] Load container "/syzkaller/managers/main/workdir/gvisor_root" "ci-gvisor-main-0"
D0304 13:48:35.969367   10261 x:0] Signal container "ci-gvisor-main-0": signal 0
D0304 13:48:35.969389   10261 x:0] Signal sandbox "ci-gvisor-main-0"
D0304 13:48:35.969393   10261 x:0] Connecting to sandbox "ci-gvisor-main-0"
D0304 13:48:35.969704   10261 x:0] urpc: successfully marshalled 96 bytes.
I0304 13:48:36.560529   10261 x:0] Found sandbox "ci-gvisor-main-0", PID: 14629
I0304 13:48:36.560559   10261 x:0] Retrieving sandbox stacks
D0304 13:48:36.560568   10261 x:0] Stacks sandbox "ci-gvisor-main-0"
D0304 13:48:36.560572   10261 x:0] Connecting to sandbox "ci-gvisor-main-0"
D0304 13:48:36.560952   10261 x:0] urpc: successfully marshalled 36 bytes.
W0304 13:48:36.682120   10261 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-main-0" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-main-0" stacks: urpc method "debug.Stacks" failed: connection reset by peer
goroutine 577 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc000ca54a0, 0x0, 0x694f)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x37c
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc000ca54a0, 0xc001d5fad0, 0xc001d5fc60, 0x6, 0x6)
	pkg/sentry/platform/ptrace/subprocess.go:390 +0xb8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc000ca54a0, 0xc000ca54b0, 0x9, 0xc001d5fc60, 0x6, 0x6, 0x4, 0xc001d5fca0, 0x6f7956)
	pkg/sentry/platform/ptrace/subprocess.go:428 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc0002f4380, 0x9, 0xc001d5fc60, 0x6, 0x6, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).MapFile(0xc0002f4380, 0xa37000, 0xc, 0x10fd3000, 0x10fd5000, 0xc000000001, 0x5, 0xa37000)
	pkg/sentry/platform/ptrace/subprocess.go:571 +0xfc
gvisor.googlesource.com/gvisor/pkg/sentry/platform/filemem.(*FileMem).MapInto(0xc00012a900, 0xdd1ac0, 0xc0002f4380, 0xa37000, 0x10fd3000, 0x10fd5000, 0x1, 0xc001d5fd80, 0x6e2e31)
	pkg/sentry/platform/filemem/filemem.go:512 +0xea
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).mapASLocked(0xc0009c0000, 0xc0009c06f0, 0x4, 0xa37000, 0xa38000, 0xa37000, 0xa38000, 0x0)
	pkg/sentry/mm/address_space.go:186 +0x1ac
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).HandleUserFault(0xc0009c0000, 0xdd29c0, 0xc00091a000, 0xa37910, 0x1, 0x7f4506cc9530, 0xc00102ff00, 0x100)
	pkg/sentry/mm/syscalls.go:71 +0x277
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc00091a000, 0xdbaa80, 0x0)
	pkg/sentry/kernel/task_run.go:251 +0x7ba
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc00091a000, 0x5f)
	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