panic: ptrace status unexpected: got 31, wanted stopped

goroutine 635602 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc00118b2c0, 0x0, 0x41e1)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x38d
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc00118b2c0, 0xc0013ffb48, 0xc0013ffcd8, 0x6, 0x6)
	pkg/sentry/platform/ptrace/subprocess.go:390 +0xb8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc00118b2c0, 0xc00118b2d0, 0x9, 0xc0013ffcd8, 0x6, 0x6, 0xc0003d17c0, 0xc0013ffc88, 0x6c5a14)
	pkg/sentry/platform/ptrace/subprocess.go:428 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc000408080, 0x9, 0xc0013ffcd8, 0x6, 0x6, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).MapFile(0xc000408080, 0x400000, 0xdfe4e0, 0xc000204300, 0x0, 0xe2000, 0x10001, 0xc0013ffd80, 0x6f65e1)
	pkg/sentry/platform/ptrace/subprocess.go:571 +0x113
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).mapASLocked(0xc000ca2880, 0xc000ca2f80, 0x0, 0x457000, 0x458000, 0x457000, 0x458000, 0x10001)
	pkg/sentry/mm/address_space.go:186 +0x1b3
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).HandleUserFault(0xc000ca2880, 0xe05920, 0xc000f91500, 0x45724b, 0x10001, 0x7f7c0d15fa60, 0xc000e7e700, 0xc000010100)
	pkg/sentry/mm/syscalls.go:69 +0x290
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc000f91500, 0xdecfe0, 0x0)
	pkg/sentry/kernel/task_run.go:256 +0x7d6
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc000f91500, 0x181b)
	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