Easily reproducible bug found in v2.6.39-rc7-174-gddb503b. This line in fs/namei.c:nested_symlink() is triggered:
BUG_ON(nd->depth >= MAX_NESTED_LINKS);
To reproduce: run racer on any f/s. I narrowed it down to just 'rename' and 'symlink' ops (verified that other ops aren't involved).
Bisection narrowed the bug down to this one commit:
commit f74b9444192c60603020c61d7915b72893137edc
Merge: 7a63628 4ba8216
Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Wed Mar 16 17:21:00 2011 -0700
Merge branch 'config' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl
* 'config' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl:
BKL: That's all, folks
fs/locks.c: Remove stale FIXME left over from BKL conversion
ipx: remove the BKL
appletalk: remove the BKL
x25: remove the BKL
ufs: remove the BKL
hpfs: remove the BKL
drivers: remove extraneous includes of smp_lock.h
tracing: don't trace the BKL
adfs: remove the big kernel lock
I'm happy to test a fix if someone has one for me. I suspect that once BKL was removed, some lock might now be missing somewhere in the VFS that relates to rename/symlink/lookup. I'll keep digging.
Cheers,
Erez.
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