Kernel 2.6.24-23-rt locks up hard under heavy rt load

The above mentioned problem can also be reproduced with vanilla 2.6.24.7 with the latest rt patch (rt26).

The lockup is currently being discussed on linux-rt-users (http://marc.info/?t=123360942700006&r=1&w=2). It looks like the issue is related to a patch that was introduced with 2.6.24.7-rt13.

The fix for the crash can be found here:
http://marc.info/?l=linux-rt-users&m=123393014501532&w=2

The described patch should get included into the quilt series of the rt kernel:
[ubuntu/ubuntu-hardy.git]/debian/binary-custom.d/rt/patchset/

The above mentioned problem might also crash ubuntu studio (jackd, http://marc.info/?l=linux-rt-users&m=123323476722881&w=2, 2.6.26.7-rt13 had the same problem).

The attached patch has made it into 2.6.24.7-rt27.

The fix will be available with first kernel after 2.6.24-24.50.

Please clarify the situation in Jaunty and close the task if it is already fixed.

Accepted linux into hardy-proposed; please test and give feedback here. Please see https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you in advance!

Jaunty is not affected.

After installing these updates my onboard sound, virtual midi, lirc and USB TV tuner failed. Rolled back to .50 and all is well. Errors in the logs are as attached.

@stryd_one,

Do you have tested 51-generic also?

Thanks!

Sorry Alessio... it took me a few hours to get it back to working order (my first experience with rolling back kernel updates), so I haven't found such a window of opportunity since then... I'll try it ASAP.

Short version: Still no good with .51-rt, but okay with .51-generic. I'm back to 2.6.24-23-rt for the time being.

Long version: Using 2.6.24-24.51-rt, I still have logs full of those symbol errors (same thing repeated for all the devices involved). I didn't attach logs because it's the same thing with new timestamps, but I'm happy to if you need them.
Using 2.6.24-24.51-generic, I didn't see any symbol errors, but I did have some troubles with my TV Tuner, which works OK with 2.6.24-24.50-rt and -generic.

I suspected this to be related to the DKMS build of v4l-dvb I'm using and not directly related to this patch. I did notice that libc was updated too though, so perhaps that has a part to play in this? I gather that the DKMS system builds the kernel module automatically when the kernel is updated. It would have used libc to do so, so perhaps this explains the malfunctional driver. I wanted to be complete, so I thought it worth a mention. Otherwise the .51-generic kernel works OK, sound and midi and lirc are behaving.

I'm too linux-newb to know what this indicates... Is there anything I can do to assist, or is this more likely to be a problem with my particular machine?

Any word on this? There is an update I'm being alerted to today, to 2.6.24-23.52, but I'm concerned about installing that update as that is now my only working kernel version... Sorry to nag!

Don't suppose you'd like to know what was wrong with the package?

Hardy has seen the end of its life and is no longer receiving any updates. Marking the Hardy task for this ticket as "Won't Fix".