| Description | In the Linux kernel, the following vulnerability has been resolved:  nbd: Fix hung when signal interrupts nbd_start_device_ioctl()  syzbot reported hung task [1].  The following program is a simplified version of the reproducer:  int main(void) { 	int sv[2], fd;  	if (socketpair(AF_UNIX, SOCK_STREAM, 0, sv) < 0) 		return 1; 	if ((fd = open("/dev/nbd0", 0)) < 0) 		return 1; 	if (ioctl(fd, NBD_SET_SIZE_BLOCKS, 0x81) < 0) 		return 1; 	if (ioctl(fd, NBD_SET_SOCK, sv[0]) < 0) 		return 1; 	if (ioctl(fd, NBD_DO_IT) < 0) 		return 1; 	return 0; }  When signal interrupt nbd_start_device_ioctl() waiting the condition atomic_read(&config->recv_threads) == 0, the task can hung because it waits the completion of the inflight IOs.  This patch fixes the issue by clearing queue, not just shutdown, when signal interrupt nbd_start_device_ioctl(). |