panic: ptrace status unexpected: got 9, wanted stopped

goroutine 569 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc000eb6ff0, 0x0, 0xf9ef)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x521
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).switchToApp(0xc000494240, 0xc000688840, 0x11e6b80, 0xc000266240, 0x2b500)
	pkg/sentry/platform/ptrace/subprocess.go:510 +0x68e
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*context).Switch(0xc000688840, 0x11db840, 0xc000494240, 0x11e6b80, 0xc000266240, 0x7f19ffffffff, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/ptrace.go:102 +0x90
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0005d1500, 0x11cd860, 0x0)
	pkg/sentry/kernel/task_run.go:209 +0x26b
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc0005d1500, 0x63)
	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