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SubjectRe: Possible dcache BUG
Date
On Thursday 05 August 2004 04:33, Denis Vlasenko wrote:
>Hi Linus,
>
>On Thursday 05 August 2004 10:25, Linus Torvalds wrote:
>> On Wed, 4 Aug 2004, Gene Heskett wrote:
>> > I *thought* I had PREEMPT turned off, but when I did a make
>> > xconfig, it was turned on. So its now off, and a new 2.6.8-rc3
>> > is building. It was frame pointers I had turned on for the last
>> > build, still on for this one underway now.
>>
>> Your latest bug report definitely had preempt on, you could see
>> the preempt code in the oops output when disassembled.
>>
>> Also, could you please enable CONFIG_DEBUG_BUGVERBOSE by hand if
>> you use the -mm tree, since you definitely hit a BUG() in there
>> somewhere, but in the -mm tree, the BUG() message is totally
>> unreadable unless you enable BUGVERBOSE (and it's not in the
>> config file).
>
>It is not a BUG().
>
>It's an oops (dereferencing a d_op pointer with value 0x00000900+14
>IIRC, Gene has complete disassembly with location of that event).

Unforch Denis, this is 2.6.8-rc3, the stuff we dissed was from 2.6.7,
where it can be hit without (usually that is) killing the machine
instantly. From 2.6.7-mm1 on, the death seems generally sudden and
instant, generally no logs get written at all.

>It is not reproducible on request, but happens for him from time
>to time in the same place with the same bogus value of d_op.

--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
99.24% setiathome rank, not too shabby for a WV hillbilly
Yahoo.com attorneys please note, additions to this message
by Gene Heskett are:
Copyright 2004 by Maurice Eugene Heskett, all rights reserved.
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