Odd git overrflow bug?

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We have an odd bug report in the kernel, where somebody had trouble
bisecting all the way due to

  "git is failing with "you are trying to use to much memory"(?!)"

which can't be an exact  error message quote, but the closest I can
find smells like the "unsigned_add_overflows()" check in the strbuf
code. Very odd.

See

    https://bugzilla.kernel.org/show_bug.cgi?id=121701

for the bug report.

I'm not seeing how that could *possibly* happen,  but if it indeed is
that strbuf code, maybe it could print out the function name (there
are two different cases) and values so give a hint about where/how
this happens..

Of course, since the bug report isn't an exact quote anyway, maybe
that wouldn't have helped anyway. I asked for more information.

           Linus
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