panic: ptrace status unexpected: got 9, wanted stopped

goroutine 19164 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc00097e1e0, 0x0, 0x4ce6)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x521
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).switchToApp(0xc000616240, 0xc0003cc540, 0x120ab80, 0xc00018a900, 0x1100)
	pkg/sentry/platform/ptrace/subprocess.go:508 +0x68e
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*context).Switch(0xc0003cc540, 0x11fae40, 0xc000616240, 0x120ab80, 0xc00018a900, 0x7f3dffffffff, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/ptrace.go:102 +0x90
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc000ce0000, 0x11ecd20, 0x0)
	pkg/sentry/kernel/task_run.go:205 +0x26b
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc000ce0000, 0x110)
	pkg/sentry/kernel/task_run.go:91 +0x24c
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:279 +0x19e