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-3"]: exit status 128
I0129 21:27:20.989271   62846 x:0] ***************************
I0129 21:27:20.989330   62846 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-3]
I0129 21:27:20.989345   62846 x:0] Git Revision: 24cb2c0a7256cdb515c2fc2cfc90d130e2a405ef
I0129 21:27:20.989351   62846 x:0] PID: 62846
I0129 21:27:20.989362   62846 x:0] UID: 0, GID: 0
I0129 21:27:20.989366   62846 x:0] Configuration:
I0129 21:27:20.989368   62846 x:0] 		RootDir: /syzkaller/managers/main/workdir/gvisor_root
I0129 21:27:20.989372   62846 x:0] 		Platform: ptrace
I0129 21:27:20.989378   62846 x:0] 		FileAccess: shared, overlay: false
I0129 21:27:20.989384   62846 x:0] 		Network: none, logging: false
I0129 21:27:20.989390   62846 x:0] 		Strace: false, max size: 1024, syscalls: []
I0129 21:27:20.989394   62846 x:0] ***************************
D0129 21:27:20.989409   62846 x:0] Load container "/syzkaller/managers/main/workdir/gvisor_root" "ci-gvisor-main-3"
D0129 21:27:20.990550   62846 x:0] Signal container "ci-gvisor-main-3": signal 0
D0129 21:27:20.990573   62846 x:0] Signal sandbox "ci-gvisor-main-3"
D0129 21:27:20.990577   62846 x:0] Connecting to sandbox "ci-gvisor-main-3"
D0129 21:27:20.990851   62846 x:0] urpc: successfully marshalled 96 bytes.
I0129 21:27:21.442739   62846 x:0] Found sandbox "ci-gvisor-main-3", PID: 61942
I0129 21:27:21.442799   62846 x:0] Retrieving sandbox stacks
D0129 21:27:21.442812   62846 x:0] Stacks sandbox "ci-gvisor-main-3"
D0129 21:27:21.442818   62846 x:0] Connecting to sandbox "ci-gvisor-main-3"
D0129 21:27:21.442887   62846 x:0] urpc: successfully marshalled 36 bytes.
W0129 21:27:21.504713   62846 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-main-3" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-main-3" stacks: urpc method "debug.Stacks" failed: connection reset by peer
goroutine 3608007 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc0008714a0, 0x0, 0x298a)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x3fb
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc0008714a0, 0xc081e62ad8, 0xc081e62c68, 0x6, 0x6)
	pkg/sentry/platform/ptrace/subprocess.go:390 +0xc3
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc0008714a0, 0xc0008714b0, 0x9, 0xc081e62c68, 0x6, 0x6, 0xc00095fcf0, 0x0, 0xc081e62cb0)
	pkg/sentry/platform/ptrace/subprocess.go:428 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc0006b2080, 0x9, 0xc081e62c68, 0x6, 0x6, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).MapFile(0xc0006b2080, 0x400000, 0xc, 0x10475000, 0x10557000, 0x10001, 0xc00095f670, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:571 +0x107
gvisor.googlesource.com/gvisor/pkg/sentry/platform/filemem.(*FileMem).MapInto(0xc0002ae000, 0xd5d480, 0xc0006b2080, 0x400000, 0x10475000, 0x10557000, 0x10001, 0xc081e62d90, 0x696501)
	pkg/sentry/platform/filemem/filemem.go:512 +0xeb
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).mapASLocked(0xc00095f600, 0xc00095fcf0, 0x0, 0x457000, 0x458000, 0x457000, 0x458000, 0x0)
	pkg/sentry/mm/address_space.go:186 +0x1aa
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).HandleUserFault(0xc00095f600, 0xd5d960, 0xc0886d2a80, 0x457f39, 0x10001, 0x20000080, 0x0, 0x10001)
	pkg/sentry/mm/syscalls.go:71 +0x27f
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0886d2a80, 0xd50ac0, 0x0)
	pkg/sentry/kernel/task_run.go:251 +0x77b
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc0886d2a80, 0xe543)
	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