Red Hat Bugzilla – Bug 832322
xfs unmount does not release USB device
Last modified: 2012-11-13 10:38:16 EST
I am regularly using an external USB compact flash card reader with CF cards that have XFS file systems. I plug in a compact flash card, create an xfs file system on it (using mkfs.xfs) and then mount it or mount an existing XFS file system. After my work's finished I umount the device and remove the CF card. Yet the xfs kernel module still thinks the device belongs it somehow and tries to flush xfs logs.
The device is now permanently locked by the xfs kernel module, increasing the usage number (as seen in lsmod) of the xfs module. If you plug in the same card again, xfs then complains that it is unable to mount it, as a filesystem with the UUID already exists. Also the kernel keeps giving out new device nodes (After about two hours work I am now at /dev/sdae), since the xfs module keeps locking up the previous ones.
uname -ar says:
Linux <xxx> 3.3.8-1.fc16.x86_64 #1 SMP Mon Jun 4 20:49:02 UTC 2012 x86_64 GNU/Linux
What dmesg said when the error occured with /dev/sdc1:
[53847.655702] XFS (sdc1): Mounting Filesystem
[53847.856294] XFS (sdc1): Ending clean mount
[53859.899928] XFS (sdb1): xfs_log_force: error 5 returned.
[54190.592430] XFS (sdb1): xfs_log_force: error 5 returned.
[54209.269918] XFS (sdc1): metadata I/O error: block 0x344428 ("xlog_iodone") error 5 buf count 3072
[54209.269928] XFS (sdc1): xfs_do_force_shutdown(0x2) called from line 975 of file fs/xfs/xfs_log.c. Return address = 0xffffffffa0791191
[54209.269951] XFS (sdc1): Log I/O Error Detected. Shutting down filesystem
[54209.269955] XFS (sdc1): Please umount the filesystem and rectify the problem(s)
lsmod | grep xfs
xfs 801522 29
Forgot to add the following information:
1. I have always cleanly unmounted all compact flash cards.
2. This does not happen with CF cards formatted with ext3 or ext4 (have not yet tested other file systems).
3. The card reader is not broken (at least it does not appear to be), as cards with other file systems work perfectly.
4. It does not matter which USB port I use on my laptop.
Do you see this with the 3.4 or 3.5 kernel updates?
# Mass update to all open bugs.
Kernel 3.6.2-1.fc16 has just been pushed to updates.
This update is a significant rebase from the previous version.
Please retest with this kernel, and let us know if your problem has been fixed.
In the event that you have upgraded to a newer release and the bug you reported
is still present, please change the version field to the newest release you have
encountered the issue with. Before doing so, please ensure you are testing the
latest kernel update in that release and attach any new and relevant information
you may have gathered.
If you are not the original bug reporter and you still experience this bug,
please file a new report, as it is possible that you may be seeing a
(Please don't clone this bug, a fresh bug referencing this bug in the comment is sufficient).
With no response, we are closing this bug under the assumption that it is no longer an issue. If you still experience this bug, please feel free to reopen the bug report.