Control: clone -1 -2 Control: retitle -1 pbuilder over-mounts /dev/shm on host after chroot upgraded from squeeze Control: retitle -2 pbuilder does not mount /dev/shm in squeeze chroots
On Mon, 2013-05-20 at 15:35 +0200, intrig...@debian.org wrote: > Package: pbuilder > Version: 0.215 > Severity: important > > a pbuilder --update results in: > > 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. > W: no hooks of type E found -- ignoring > I: unmounting dev/pts filesystem > I: unmounting run/shm filesystem > W: Could not unmount run/shm: umount: /dev/shm: device is busy. > (In some cases useful info about processes that use > the device is found by lsof(8) or fuser(1)) > W: Retrying to unmount run/shm in 5s > umount: /dev/shm: device is busy. > (In some cases useful info about processes that use > the device is found by lsof(8) or fuser(1)) > > ... and the last steps loop, seemingly endlessly. > > pbuilder 0.213 does not expose this problem. [...] I'm also seeing this after a build. pbuilder tries to mount various pseudo-filesystems under the chroot location, before entering the chroot, including /run/shm. But if /run/shm in the chroot is a symlink to /dev/shm, mount will follow that link and will over-mount /dev/shm on the host filesystem! It looks like /run/shm is supposed to replace /dev/shm. In squeeze, only /dev/shm exists. In wheezy, initscripts creates a /run/shm directory and makes /dev/shm a symlink to it, but will do the opposite if you have an fstab entry for /dev/shm. (systemd only creates /dev/shm, though.) Now sysvinit doesn't run in a chroot environment, but initscripts does modify /dev/shm and /run/shm on upgrade. So I think that if you've upgraded a squeeze chroot to wheezy you will see this problem, but a fresh chroot will be fine. pbuilder should fail with an obvious error message if a mountpoint in the chroot is a symlink. It should also continue to support the use of /dev/shm in some way. Ben. -- Ben Hutchings Humans are not rational beings; they are rationalising beings.
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