panic: ptrace status unexpected: got 9, wanted stopped

goroutine 8072230 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc006047c20, 0x0, 0xc284)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x3fb
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).attach(0xc006047c20)
	pkg/sentry/platform/ptrace/subprocess.go:265 +0x87
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).newThread(0xc00018a240, 0xc0022828c0)
	pkg/sentry/platform/ptrace/subprocess.go:249 +0x98
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).newThread-fm(0xc00282fbf8)
	pkg/sentry/platform/ptrace/subprocess.go:464 +0x2a
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*threadPool).lookupOrCreate(0xc00018a248, 0xc00000a508, 0xc00282fce0, 0xc000167560)
	pkg/sentry/platform/ptrace/subprocess.go:96 +0x209
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).switchToApp(0xc00018a240, 0xc005f7e480, 0xd12c20, 0xc0059730e0, 0xc00282fe00)
	pkg/sentry/platform/ptrace/subprocess.go:464 +0x158
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*context).Switch(0xc005f7e480, 0xd09240, 0xc00018a240, 0xd12c20, 0xc0059730e0, 0x7f57ffffffff, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/ptrace.go:102 +0x74
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc002872a80, 0xcfca00, 0x0)
	pkg/sentry/kernel/task_run.go:209 +0x348
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc002872a80, 0xa657)
	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