Re: 2.6.0-test2-mm3 and mysql

["Sergey S. Kostyliov" <rathamahata@php4.ru>]

Hi Heikki,

On Thursday 28 August 2003 21:59, Heikki Tuuri wrote:
> Sergey,
>
> does it always crash when you start mysqld?

Yes It was always crashing until I deleted all InnoDB files and restored
InnoDB tables from backup.

>
> It is page number 0 in the InnoDB tablespace. That is, the header page of
> the whole tablespace!
>
> The checksums in the page are ok. That shows the page was not corrupted in
> the Linux file system.
>
> InnoDB is trying to do an index search, but that of course crashes, because
> the header page is not any index page.
>
> The reason for the crash is probably that a page number in a pointer record
> in the father node of the B-tree has been reset to zero. The corruption has
> happened in the mysqld process memory, not in the file system of Linux.
> Otherwise, InnoDB would have complained about page checksum errors.
>
> No one else has reported this error. I have now added a check to a future
> version of InnoDB which will catch this particular error earlier and will
> hex dump the father page.

Yes, now it seems for me that this particular crash in not related to linux
kernel at all.
The funny thing I've managed to get another InnoDB crash on the same box
http://sysadminday.org.ru/linux-2.6.0-test4_InnoDB_crash-20030828
which in turn was posted to linux-kernel over a two hours ago.
This time the cheksums are different :(

>
> By the way, I noticed that a website http://www.linuxtestproject.org has
> made an extensive regression test suite for Linux. They have also
> successfully run big MySQL and DB2 stress tests on their computers, on
> 2.5.xx kernels. If there is something wrong with 2.5.xx or 2.6.0, it
> apparently does not concern all computers.
>
> "
> The Linux Test Project test suite, ltp-20030807, has been released. The
> latest version of the testsuite contains 2000+ tests for the Linux OS.
> "
>
> The general picture about InnoDB corruption is that reports have almost
> stopped after I advised people on the mailing list to upgrade to
> Linux-2.4.20 kernels.

In fact I'm also a happy InnoDB user. It runs fine on 6 of my production
servers. Thanks for a nice work btw!

It has worked fine also on our development server until I upgraded it to
2.6.0-testX. I don't know. It might be just a broken hardware
which is better stressed with 2.6 than with 2.4...

>
> With apologies,
>
> Heikki
> Innobase Oy