Re: 2.6.20: reproducible hard lockup with RAID-5 resync

[Corey Hickey <bugfood-ml@fatooh.org>]

Corey Hickey wrote:
> Corey Hickey wrote:
>> I think I have found an easily-reproducible bug in Linux 2.6.20. I have
>> already applied the "Fix various bugs with aligned reads in RAID5"
>> patch, and that had no effect. It appears to be related to the resync
>> process, and makes the system lock up, hard.
> 
> I now have a different build of 2.6.20 running resync without the
> reported problem. I'll try to isolate the specific difference between
> the two builds some time tomorrow.

Ok, so the difference is CONFIG_SYSFS_DEPRECATED. If that is not
defined, the kernel locks up. There's not a lot of code under
#ifdef/#ifndef CONFIG_SYSFS_DEPRECATED, but since I'm not familiar with
any of it I don't expect trying to locate the bug on my own would be
very productive.

Neil, do you have CONFIG_SYSFS_DEPRECATED enabled? If so, does disabling
it reproduce my problem? If you can't reproduce it, should it take the
problem over to linux-kernel?

Thanks,
Corey