panic: ptrace status unexpected: got 9, wanted stopped

goroutine 498 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc000580d20, 0x0, 0xd551)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x3fb
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).switchToApp(0xc0002ac240, 0xc0001e4180, 0xd12c20, 0xc0002587e0, 0xc000663e00)
	pkg/sentry/platform/ptrace/subprocess.go:510 +0x381
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*context).Switch(0xc0001e4180, 0xd09240, 0xc0002ac240, 0xd12c20, 0xc0002587e0, 0xc0ffffffff, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/ptrace.go:102 +0x74
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0006fd500, 0xcfca00, 0x0)
	pkg/sentry/kernel/task_run.go:209 +0x348
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc0006fd500, 0x54)
	pkg/sentry/kernel/task_run.go:95 +0x163
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:279 +0xfe