Karel Zak wrote:
 I guess it's udevd (on new distros). It checks by inotify for
 filesystem changes to maintain /dev/disk/by-* symlinks.

Thank you Karel for sharing your thoughts on this "failure to inform kernel of partition changes" problem.

Due to the intermittent nature of this problem it has been a challenge to discover the root cause. I too suspect a problem with udev, but this is just a guess at this time. So far I have been unable to identify a specific commit or udev version that introduced the problem.

Further confusing the issue is that SysRescCD-1.3.4 does not experience the problem, but has a udev version between Fedora 12 and GParted-Live-0.5.0-3 which exhibit the problem.

Linux kernel and udev versions for some test distributions follow:

    SysRescCD-1.3.4 does not exhibit this problem (based on gentoo):
         linux-2.6.31.9 (with btrfs update from 2.6.32)
        udev-146-r1

    Fedora 12 does exhibit the problem:
         linux-2.6.31.5-127
         udev-145-12

    GParted Live 0.5.0-3 does exhibit the problem (based on debian sid):
         linux-2.6.31-1
         udev-148-2

This is a puzzling situation indeed.

I have been tracking my test results in the following bug report:
https://bugzilla.gnome.org/show_bug.cgi?id=604298


Are you aware of a specific commit or udev version that introduced this change?

Do you have some suggestions on how to identify the root cause?

Regards,
Curtis Gedak

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