Red Hat Bugzilla – Bug 428154
FAT32 file corruption
Last modified: 2009-01-09 00:44:56 EST
Description of problem:
I have a dual-boot Dell XPS M1710. I rebooted from WinXP Pro to F8 as usual. I
have a large FAT32 shared drive (/dev/sda6) that is mounted as /data in Linux.
I launched VMWare Player and it said that it could not open the files because
the file system was read-only. I remounted it, and again, same error. Some
Google-Fu revealed that I should check /var/log/messages (paraphrasing sorry):
FAT: Filesystem panic (dev sda6)
fat_free_clusters: deleting FAT entry beyond EOF
Filesystem has been set read-only.
I rebooted and had Windows' chkdsk check it, and it ended up truncating a few
files. I booted back to F8 and then instead of risking my VM machine going poof,
went into a scratch directory and copied some code there. I was able to do
"make" once, on the second run, again the filesystem went r/o with the same
error in the main log. So went back to Windows, had it chkdsk again, fixed it,
and then rebooted into 184.108.40.206-63. The scratch directory seemed OK for like 30
"make clean; sync; sync; sync; make; sync; sync; sync" iterations, and I had
made a copy of the VM under Windows, so tried that. Everything seems rock solid
Version-Release number of selected component (if applicable):
NOTE: 220.127.116.11-63.fc8 seems FINE
Not really all that willing to keep risking; it's a work machine.
Steps to Reproduce:
1. Boot into 18.104.22.168-85.fc8 from grub
2. Do a lot of disk activity on FAT32 drive
File system corruption.
No file system corruption.
As far as I know, everything else was the same - the wireless was disabled, and
no external USB/FireWire devices.
I'm surprised nobody has said anything about this.
Anyway, it looks like it may have happened again today, this time under the
previous kernel 22.214.171.124-63.fc8. I have been safely using that for a week, but
now all the files I had edited are saying "The file or directory is corrupted
It looks like I've now lost a full days work. This cannot be good.
Well, http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-126.96.36.199 looked
promising. It seemed to work for most of the day. But then the weirdest thing
happened when I rebooted into WinXP. I was editing a bunch of source files that
are under svn control. When I booted back to Windows, it was able to read the
files fine, but they were the OLD files from before I had rebooted! svn said the
files had no changes; I made sure to have it cleanup and rescan the files. I
rebooted thinking maybe I was working in another directory. No, under Linux "svn
diff" showed my changes. So I rebooted again and forced a chkdsk. Now the
Windows side sees the new files, and the recovered lost chains are all the
original files. So I am guessing that the two sides aren't looking at the same
FAT tables or something???
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