panic: ptrace status unexpected: got 9, wanted stopped

goroutine 3809375 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc001a86c30, 0x0, 0x459d)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x3fb
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).switchToApp(0xc0006b3140, 0xc000329b00, 0xd2d720, 0xc0006bf440, 0xc004941e00)
	pkg/sentry/platform/ptrace/subprocess.go:508 +0x381
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*context).Switch(0xc000329b00, 0xd1f340, 0xc0006b3140, 0xd2d720, 0xc0006bf440, 0x7f3cffffffff, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/ptrace.go:102 +0x74
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc002cd6a80, 0xd129c0, 0x0)
	pkg/sentry/kernel/task_run.go:205 +0x348
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc002cd6a80, 0x7183)
	pkg/sentry/kernel/task_run.go:91 +0x149
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:279 +0xfe