panic: ptrace status unexpected: got 9, wanted stopped

goroutine 453 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc000b685a0, 0x0, 0x3ce1)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x521
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).switchToApp(0xc000104380, 0xc0005023c0, 0x120bbe0, 0xc00046ac60, 0x11f00)
	pkg/sentry/platform/ptrace/subprocess.go:508 +0x68e
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*context).Switch(0xc0005023c0, 0x11fbea0, 0xc000104380, 0x120bbe0, 0xc00046ac60, 0x7f08ffffffff, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/ptrace.go:102 +0x90
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc000733500, 0x11edd80, 0x0)
	pkg/sentry/kernel/task_run.go:205 +0x26b
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc000733500, 0x5b)
	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