Re: Reproducible, corrupt packfile after fresh git-svn checkout message (gitml: message 5 of 20) (gitml: message 6 of 20)

Ben Tebulin [off-list ref] writes:

Am 08.08.2013 16:20, schrieb Thomas Rast - trast@inf.ethz.ch:

quoted

Can you try to reproduce with a version older than v1.8.3?
E.g. v1.8.2.3.
I'm asking because the above points at packed_object_info(), which I
recently rewrote to be nonrecursive.

It seems to run 'much better' 
  v1.8.2.3 : 3/10 runs do fail
  fb56570  : 9/10 runs do fail

The good news is that this shifts the blame away from my commit ;-) as
the problem clearly existed even before that.

The bad news, of course, is that this is another hunch that turned out
to be wrong.  I'm running out of ideas.

They always fail on a big blob (39MB) as I wrote in my first e-mail:

ben@n179 /tmp/project.git $ ~/projects/git.git/git-show 49cdd0b21a351f3366008615d2cf8d03ca943978 | wc -c
error: sha1 mismatch 49cdd0b21a351f3366008615d2cf8d03ca943978
fatal: bad object 49cdd0b21a351f3366008615d2cf8d03ca943978
0
ben@n179 /tmp/project.git $ ~/projects/git.git/git-show 49cdd0b21a351f3366008615d2cf8d03ca943978 | wc -c
39517156

Hrmm.  I wonder about the significance of those 39MB.  What is your
core.packedGitWindowSize?  (Judging from the pastes you seem to be on
64bit, so the default would be 1GB.)

-- 
Thomas Rast
trast@{inf,student}.ethz.ch

I was unable to reproduce the error with the same repo and same Git
version on a different machine (Debian Squeeze x64 on a AMD Phenom x6
1045T).

I'm running out of ideas.

Me, too. Based on out current observations I'd assume one of:

a) a rare, timing-sensitive bug in Git
b) a compiler/distribution/environment sensitive issue
c) or defect/buggy Hardware (CPU, Memory)

Hrmm.  I wonder about the significance of those 39MB.  What is your
core.packedGitWindowSize?  (Judging from the pastes you seem to be on
64bit, so the default would be 1GB.)

The default. I have 12GB RAM.

So I'll try to rule out b) and c) as far as I can and report in if I
have any new findings.

Nevertheless thank you very much for your extensive assistance!

- Ben