I could be on a wild goose chase here. But one of the prominent changes between 77 and 78 is the backing_dev_info element of the queue turning into a pointer.
Part of the "bdi" changes in this bit: ++ * UbuntuKVM guest crashed while running I/O stress test with Ubuntu kernel ++ 4.4.0-47-generic (LP: #1659111) I believe from here: https://patchwork.kernel.org/patch/9547199/ For example this: --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -2462,7 +2462,7 @@ static int drbd_congested(void *congested_data, int bdi_bits) if (get_ldev(device)) { q = bdev_get_queue(device->ldev->backing_bdev); - r = bdi_congested(&q->backing_dev_info, bdi_bits); + r = bdi_congested(q->backing_dev_info, bdi_bits); put_ldev(device); if (r) reason = 'b'; But if I check the Ubuntu-specific code, that change does not seem to be done everywhere: $ zcat linux_4.4.0-78.99.diff.gz | grep bdi_congested.*backing_dev -B2 | tail -n8 struct request_queue *q = bdev_get_queue(rdev->bdev); - ret |= bdi_congested(&q->backing_dev_info, bits); + ret |= bdi_congested(q->backing_dev_info, bits); -- + struct request_queue *q = bdev_get_queue(rs->dev[p].dev->bdev); + + r |= bdi_congested(&q->backing_dev_info, bdi_bits); Extracting only the "new" files, I find it here indeed: $ mkdir foo; cd foo $ patch -tp1 < ../linux_4.4.0-78.99.diff.gz $ find . -name '*.c' | xargs grep -B2 bdi_congested.*backing_dev_info ./ubuntu/dm-raid4-5/dm-raid4-5.c- struct request_queue *q = bdev_get_queue(rs->dev[p].dev->bdev); ./ubuntu/dm-raid4-5/dm-raid4-5.c- ./ubuntu/dm-raid4-5/dm-raid4-5.c: r |= bdi_congested(&q->backing_dev_info, bdi_bits); This is just an example of course, I believe there could be more "bdi" changes like that one that haven't been made. Correct me if I'm wrong though. I've never done any kernel dev, so I could be way off base here. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1691741 Title: Execute NX-protected page - 4.4.0-78-generic - kernel panic To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1691741/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
