<div dir="ltr">Hi Krister, Thanks again for tracking down another of these super subtle race conditions. I have prepared debdiffs for noble, oracular and plucky. We just need to land the change in plucky first before we can SRU to noble. I have asked the Foundations Team to sponsor, hopefully the debdiff is up to their expectations. Thanks, Matthew</div> <div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Thu, 5 Dec 2024 at 07:24, Krister Johansen <<a href="mailto:kjlx@templeofstupid.com">kjlx@templeofstupid.com</a>> wrote: </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi, I wanted to raise awareness about a bug that my team has been running into on Noble. I logged a launchpad bug here with the details: <a href="https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/2090972" rel="noreferrer" target="_blank">https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/2090972</a> The short explanation is that libblkid in util-linux can misread the ext4 superblock checksum and incorrectly decide that it doesn't match. If it's systemd-udevd using libblkid to do this, then that can result in udev removing devlinks that it thinks don't exist any longer, even though the device is still present. (E.g. if libblkid doesn't find a filesystem, then it doesn't return the label property, and a label property disappearing can result in udev removing that devlink). The mount of /boot fails, because it's trying to use a /dev/disk/by-label path, and that path sometimes disappears because of the bug. This subsequently results in packaging operations and anything else that interacts with /boot failing. (Usually update-grub related). We've also seen the root disk have this problem, though the failure there was more subtle. The device mounted, but a subsequent mkinitramfs failed during a kernel package install, because of missing /dev/disk/by-label links. I've fixed the bug in libblkid and gotten the fix merged upstream. We've also patched this locally in our own version of util-linux. I've attached a patch to the bug report which is the version of the fix we used against the Noble packages. We haven't seen the problem reproduce since rolling this out. The underlying problem affects util-linux >= 2.39. Would it be possible for somebody to pull this patch into the affected Ubuntu util-linux versions? Thanks, -K -- Ubuntu-devel-discuss mailing list <a href="mailto:Ubuntu-devel-discuss@lists.ubuntu.com" target="_blank">Ubuntu-devel-discuss@lists.ubuntu.com</a> Modify settings or unsubscribe at: <a href="https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss" rel="noreferrer" target="_blank">https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss</a> </blockquote></div>