Messages in this thread |  | | Date | Thu, 15 Nov 2001 19:55:51 -0500 | From | Ben Collins <> | Subject | Re: Bug in ext3 |
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On Thu, Nov 15, 2001 at 05:07:42PM -0700, Andreas Dilger wrote: > On Nov 15, 2001 18:38 -0500, Ben Collins wrote: > > I wont say that I am absolutely 100% sure that ext3 was never tried on > > this filesystem. I am pretty certain, but I'm guessing it doesn't really > > make much difference at this point. Your scenario of the corruption > > makes sense. I'll see if I can test your patch at some point (but I most > > likely cannot). > > > > Filesystem features: has_journal filetype sparse_super > > ... > > Journal inode: 48 > > What I'm thinking happened here is at some point long ago (maybe before > the server was put into production, who knows) someone tested ext3 on > it. When they were done, they deleted the .journal file (inode #48) > but e2fsck didn't clean up the superblock journal fields, and it went > unnoticed until now. > > The other alternative is that you have some sort of random single-bit > data corruption going on (the journal inode is also a single bit set, > 48 = 0x30, but a different bit than has_journal, = 0x0004). > > In any case, with e2fsprogs 1.18 (and probably _only_ that version) > it doesn't complain about has_journal, but it also doesn't check if the > journal is bad and clean it up. When you try to start with an ext3-aware > kernel, it conspires to corrupt inode 48 when it tries to unload the > journal, even when it knows the journal is bad. > > What would be interesting to correlate is what inode 48 is (probably a > directory, or you wouldn't have noticed it at all), with the corruption > problems you are having while ext3 is loaded.
48 /usr/lib/perl5/5.005/File/Copy.pm
Since this file is pretty small, I can only assume that it overwrote some adjacent files. There is some corruption in this file (luckily in the comment area :) starting at the 25th byte, and extending 12 bytes in length. Here's the values from hexedit:
00 00 00 01 00 00 00 00 00 00 00 00
-- .----------=======-=-======-=========-----------=====------------=-=-----. / Ben Collins -- Debian GNU/Linux \ ` bcollins@debian.org -- bcollins@openldap.org -- bcollins@linux.com ' `---=========------=======-------------=-=-----=-===-======-------=--=---' - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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