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Re: crash in TC_LOG_MMAP::log_one_transaction in maria-10.0.0


Hello Kristian,
Thanks for the patch.  It fixes the problem that I described.  Now
onto the next problem.

Try running:
logxid.deadlock.py --k=1 &
logxid.deadlock.py --k=2 &
logxid.deadlock.py --k=3 &

When one runs multiple XA clients with a debug build of my branch, we
crash at log.cc line 7567.  An unlocked mutex is being unlocked.  I
discussed this problem with Sergei and we think that the problem is
caused a few lines above.  I updated my branch (
lp:~prohaska7/maria/2pc-crash-with-maria10-and-tokudb) with a proposed
bug fix.

Rich Prohaska

On Sun, Nov 18, 2012 at 6:59 AM, Kristian Nielsen
<knielsen@xxxxxxxxxxxxxxx> wrote:
> Kristian Nielsen <knielsen@xxxxxxxxxxxxxxx> writes:
>> Sorry, the patch is broken, I didn't test carefully enough.
> In fact, I found *another* bug, making it 3 in total...
> The first two of these also exists in older MariaDB/MySQL, but may be
> hard/impossible to trigger without the third bug, which is something I
> introduced in 10.0.
> Try this patch, I verified more carefully now that it fixes the problem and
> allows your test to run without crashing.
> Thanks again for taking the time to report this. Let us know if you find more
> issues, and I will look into fixing them as well.
>  - Kristian.

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