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 On Thu, 5 Dec 2024 at 07:24, Krister Johansen <[email protected]> wrote: > 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: > > https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/2090972 > > 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 > [email protected] > Modify settings or unsubscribe at: > https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss >
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