On Wed, 2009-01-07 at 15:29 -0800, Linus Torvalds wrote:
> It is certainly possible. It's too bad that it's private, because it makes
> it _much_ harder to try to pinpoint this.
My most esteemed colleague (Ken aka kb) who pointed out the memory issue
was on the right path (I think), and I have a reproduction case you can
try with your very own Linux kernel tree!
WOO!
I set ulimit -v really low (150M), and the operations I made got an
mmap(2) fatal error, but there is a sweet spot that I found, see the
transcript below. I basically chose an arbitrary revision from a couple
of weeks ago, and rolled the repository back to that point, then I tried
with iterations of ulimit -v 150, 250, 450, and then back down to 350.
tyler@grapefruit:~/source/git/linux-2.6> limit
cputime unlimited
filesize unlimited
datasize unlimited
stacksize 8MB
coredumpsize 0kB
memoryuse 2561MB
maxproc 24564
descriptors 1024
memorylocked 64kB
addressspace unlimited
maxfilelocks unlimited
sigpending 24564
msgqueue 819200
nice 0
rt_priority 0
tyler@grapefruit:~/source/git/linux-2.6> export
START=56d18e9932ebf4e8eca42d2ce509450e6c9c1666
tyler@grapefruit:~/source/git/linux-2.6> git reset --hard $START
HEAD is now at 56d18e9 Merge branch 'upstream' of
git://ftp.linux-mips.org/pub/scm/upstream-linus
tyler@grapefruit:~/source/git/linux-2.6> ulimit -v `echo "350 *
1024" | bc -l`
tyler@grapefruit:~/source/git/linux-2.6> git pull
error: failed to read object
be1b87c70af69acfadb8a27a7a76dfb61de92643 at offset 1850923
from .git/objects/pack/pack-dbe154052997a05499eb6b4fd90b924da68e799a.pack
fatal: object be1b87c70af69acfadb8a27a7a76dfb61de92643 is
corrupted
tyler@grapefruit:~/source/git/linux-2.6>
I've tried this a couple of times, and it does seem to be reproducible,
let me know if you have any issues reproducing it locally and I'll try
to dig into it more with valgrind or something a bit more pin-pointing
than "ulimit -v && try, try again"
Cheers
--
-R. Tyler Ballance
Slide, Inc.
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