panic: ptrace status unexpected: got 9, wanted stopped

goroutine 7054307 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc0019abb30, 0x0, 0xca8f)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x3fb
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).switchToApp(0xc0000f9080, 0xc001ec4180, 0xd2c4c0, 0xc0006ca360, 0xc001e3de00)
	pkg/sentry/platform/ptrace/subprocess.go:508 +0x381
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*context).Switch(0xc001ec4180, 0xd1e0e0, 0xc0000f9080, 0xd2c4c0, 0xc0006ca360, 0x7f60ffffffff, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/ptrace.go:102 +0x74
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc002b9a000, 0xd11760, 0x0)
	pkg/sentry/kernel/task_run.go:205 +0x348
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc002b9a000, 0xc4b1)
	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