panic: ptrace status unexpected: got 9, wanted stopped

goroutine 398 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc0003dc960, 0x0, 0xd636)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x521
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).switchToApp(0xc000178300, 0xc0003c2480, 0x11e6b80, 0xc000152fc0, 0x5600)
	pkg/sentry/platform/ptrace/subprocess.go:510 +0x68e
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*context).Switch(0xc0003c2480, 0x11db840, 0xc000178300, 0x11e6b80, 0xc000152fc0, 0x7f66ffffffff, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/ptrace.go:102 +0x90
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0007f8000, 0x11cd860, 0x0)
	pkg/sentry/kernel/task_run.go:209 +0x26b
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc0007f8000, 0x60)
	pkg/sentry/kernel/task_run.go:95 +0x27a
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:279 +0x19e