panic: ptrace status unexpected: got 31, wanted stopped

goroutine 407588 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc000bf85a0, 0x0, 0x6dc2)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x521
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc000bf85a0, 0xc0014272e8, 0xc001427568, 0x2, 0x2)
	pkg/sentry/platform/ptrace/subprocess.go:390 +0x113
DIAGNOSIS: