panic: ptrace status unexpected: got 9, wanted stopped

goroutine 135 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc42026c990, 0x1f)
	pkg/sentry/platform/ptrace/subprocess.go:304 +0x1e6
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).switchToApp(0xc420146240, 0xc42049c300, 0xc54e20, 0xc420146360, 0x404800)
	pkg/sentry/platform/ptrace/subprocess.go:462 +0x384
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*context).Switch(0xc42049c300, 0xc4f280, 0xc420146240, 0xc54e20, 0xc420146360, 0xc4ffffffff, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/ptrace.go:102 +0x71
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc42049fb00, 0xc42ca0, 0x0)
	pkg/sentry/kernel/task_run.go:209 +0x17d
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc42049fb00, 0x9)
	pkg/sentry/kernel/task_run.go:95 +0x174
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:258 +0x100