panic: ptrace status unexpected: got 9, wanted stopped

goroutine 288 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc000c26c30, 0x0, 0x1bb7)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x521
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).switchToApp(0xc00027e540, 0xc0006e0300, 0x11e6b80, 0xc00052ca20, 0x669c00)
	pkg/sentry/platform/ptrace/subprocess.go:510 +0x68e
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*context).Switch(0xc0006e0300, 0x11db840, 0xc00027e540, 0x11e6b80, 0xc00052ca20, 0x7f9dffffffff, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/ptrace.go:102 +0x90
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0002eca80, 0x11cd860, 0x0)
	pkg/sentry/kernel/task_run.go:209 +0x26b
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc0002eca80, 0x54)
	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