panic: ptrace status unexpected: got 31, wanted stopped

goroutine 3308299 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc0016b1770, 0x0, 0x7a80)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x38d
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc0016b1770, 0xc001459b48, 0xc001459cd8, 0x6, 0x6)
	pkg/sentry/platform/ptrace/subprocess.go:390 +0xb8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc0016b1770, 0xc0016b1780, 0x9, 0xc001459cd8, 0x6, 0x6, 0xc0003461c0, 0xc001459c88, 0x6c7c64)
	pkg/sentry/platform/ptrace/subprocess.go:428 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc0001479c0, 0x9, 0xc001459cd8, 0x6, 0x6, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).MapFile(0xc0001479c0, 0x400000, 0xe02700, 0xc000562300, 0x0, 0xe2000, 0x10001, 0xc001459d80, 0x6f8831)
	pkg/sentry/platform/ptrace/subprocess.go:571 +0x113
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).mapASLocked(0xc00f1fcd80, 0xc00f1fd480, 0x0, 0x457000, 0x458000, 0x457000, 0x458000, 0x10001)
	pkg/sentry/mm/address_space.go:186 +0x1b3
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).HandleUserFault(0xc00f1fcd80, 0xe09b80, 0xc00c690000, 0x45718b, 0x10001, 0x7fe87e956a60, 0xc00c330c00, 0xc000010100)
	pkg/sentry/mm/syscalls.go:69 +0x290
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc00c690000, 0xdf11e0, 0x0)
	pkg/sentry/kernel/task_run.go:256 +0x7d6
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc00c690000, 0xeda6)
	pkg/sentry/kernel/task_run.go:92 +0x194
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:286 +0xfe