On Mon, Apr 23, 2001 at 06:27:23PM -0500, Bob McElrath wrote:
> Well, take that back, I just got it to hang. Again, this is 2.4.4pre3
> with alpha-numa-3 and rwsem-generic-4. I saw it upon starting mozilla.
> I also saw some scary filesystem errors that may or may not be related:
> Apr 23 18:09:40 draal kernel: EXT2-fs error (device sd(8,2)):
> ext2_new_block: Free blocks count corrupted for block group 252
That is probably unrelated to the ps hang. I suspect you are been bitten by the
ext2 metadata corruption (2.4.4pre2 was just fixed but previous kernel wasn't).
> rwsem-generic-6 is the latest from Andrea, I'll build a new 2.4.4pre4
> kernel with these patches and let you know the results. Have you made
Yes, that's safe.
> changes between rwsem-generic-4 and rwsem-generic-6 that would
> fix/prevent a deadlock?
No, but I think they are two separate issues.
> Let me know if there are any useful tests I could perform. Would it be
> useful for me to run the rwsem benchmarks you've been using? Could
> these detect a deadlock situation?
yes to be sure you can run it without my patch and see if it hangs (I never
tried that myself, but I was able to reproduce the ps hang quite easily and it
was quite obviously due the rwsemaphores and it gone away completly after I
used the generic semaphores).
Andrea
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This archive was generated by hypermail 2b29 : Mon Apr 23 2001 - 21:00:48 EST