On 03/30/2011 07:58 AM, Michael Widenius wrote: > > Hi! > >>>>>> "Lance" == Lance Albertson <[email protected]> writes: > > Lance> I've run into another weird problem where MariaDB is segfaulting > Lance> and dieing on Gentoo Hardened Linux. I can't figure out if its a weird > Lance> situation with my Gentoo environment on the machine or something with > Lance> MariaDB itself. I don't have this problem on the other machine running > Lance> MariaDB. It seems to happen under load about once or twice a day. I > have > Lance> a nearly identical machine that doesn't have any of these problems. > > Lance> I'm running mariadb-5.1.50 under Hardened Gentoo. The compiled flags > are: > > Lance> --- > Lance> Configuration summary for MariaDB Server version 5.1.50-MariaDB > > <cut> > > Lance> mysqld: malloc.c:5153: malloc_consolidate: Assertion > Lance> `nextchunk->fd_nextsize->bk_nextsize == nextchunk' failed. > Lance> 110329 13:11:25 [ERROR] mysqld got signal 6 ; > > This looks like memory overrun, something that we have not seen in > MariaDB for a long time. (We are testing all builds with valgrind to > ensure we don't have any memory overruns). > > <cut> > > Is there a way we could install a debug binary on the machine in > question so that we could be able to debug this? > > (We would need a binary compiled with debug + a core to be able to > find out what's going on). > > The easyest way to get a debug binary is to get the source and > compile it with: > > ./BUILD/compile-pentium-debug-max > > and then just copy it over your original mysqld binary.
I will try and get it compiled with debug symbols under Gentoo using their documentation. If that doesn't work I'll do it manually. > If you can get us access to the system, we can help you with this. If we get to the point where I can't get it farther with it, I'll do that but for now I feel more comfortable doing it myself. > You can find us at '#maria' channel on freenode if you want to discuss > this real time. Thanks for that tip! So far the machine has been running smoothly. I just did a minor glibc upgrade to see if that helped it or not. I have monit monitoring mysqld so that it will kick it more automatically. Cheers- -- Lance Albertson Systems Administrator / Architect Open Source Lab Network Services Oregon State University
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