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Date: Thu, 10 Feb 2005 20:05:10 -0200
From: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
To: Todd Shetter <tshetter-lkml@earthlink.net>, jgarzik@pobox.com
Cc: linux-kernel@vger.kernel.org, jgarzik@pobox.com
Subject: Re: 2.4.x kernel BUG at filemap.c:81
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On Wed, Feb 09, 2005 at 11:23:42PM -0500, Todd Shetter wrote:
> Marcelo Tosatti wrote:
> 
> >On Wed, Feb 09, 2005 at 03:47:28PM -0500, Todd Shetter wrote:
> > 
> >>>>>>Running slackware 10 and 10.1, with kernels 2.4.26, 2.4.27, 2.4.28, 
> >>>>>>2.4.29 with highmem 4GB, and highmem i/o support enabled, I get a 
> >>>>>>system lockup. This happens in both X and console. Happens with and 
> >>>>>>without my Nvidia drivers loaded. I cannot determine what makes this 
> >>>>>>bug present it self besides highmem and high i/o support enabled. Im 
> >>>>>>guessing the system is fine until highmem is actually used to some 
> >>>>>>point and then it borks, but I really have no idea and so im just 
> >>>>>>making a random guess. I ran memtest86 for a few hours a while ago 
> >>>>>>thinking that it may be bad memory, but that did not seem to be the 
> >>>>>>problem.
> >>>>>>
> >>>>>>If you need anymore information, or have questions, or wish me to 
> >>>>>>test anything, PLEASE feel free to contact me, I would really like to 
> >>>>>>see this bug resolved. =)
> >>>>>>
> >>>>>>Todd Shetter
> >>>>>>
> >>>>>>Feb  8 19:49:31 quark kernel: kernel BUG at filemap.c:81!
> >>>>>>Feb  8 19:49:31 quark kernel: invalid operand: 0000
> >>>>>>Feb  8 19:49:31 quark kernel: CPU:    0
> >>>>>>Feb  8 19:49:31 quark kernel: EIP:    0010:[<c01280d1>]    Tainted: P
> >>>>>>           
> >>>>>Hi Todd, 
> >>>>>
> >>>>>Why is your kernel tainted ?
> >>>>>
> >>>>I had the nvidia 1.0-6629 driver loaded when I got that error. I 
> >>>>compiled the kernel using the slackware 10.1 config, enabled highmem 
> >>>>4GB support, highmem i/o, and then some kernel hacking options 
> >>>>including debugging for highmen related things.
> >>>>
> >>>>I booted, loaded X with KDE, opened firefox a few times, and then 
> >>>>started running hdparm because some newer 2.4.x kernels dont play nice 
> >>>>with my SATA, ICH5, and DMA. hdparm segfaulted while running the drive 
> >>>>read access portion of its tests, and things locked up from there in 
> >>>>about 30secs.
> >>>>
> >>>>I've gotten the same error with the nvidia driver not loaded, so I dont 
> >>>>think that is part of the problem.
> >>>>
> >>>>As I said, if you want me to test or try anything feel free to ask.  =)
> >>>>
> >>>Todd,
> >>>
> >>>Would be interesting to have the oops output without the kernel nvidia 
> >>>module. 
> >>>Do you have that saved?
> >>>
> >>Sorry, it took me FOREVER to get this bug to appear again, and this time 
> >>its a little different.
> >>   
> >>
> >
> >Hum, both BUGs are due to a page with alive ->buffers mapping.
> >
> >Did it crashed right after hdparm now too? 
> >
> >Can you boot your box without SATA drivers, configuring the interface to 
> >IDE mode ?
> >
> >Which problems are you facing with newer v2.4.x kernels and SATA? 
> > 
> >
> 
> Im waiting for the system to crash, so I figured I might as well get on 
> with the SATA problems....
> 
> Running 2.4.29 neither the CONFIG_BLK_DEV_IDE_SATA nor the 
> CONFIG_SCSI_SATA are set currently and DMA is not enabled on either of 
> my drives,  hda: ST380013AS,  hdb: WDC WD2500SD-01KCB0,  hdc: Maxtor 
> 94610U6. Setting DMA manually on the hard drives yields a HDIO_SET_DMA 
> failed: Operation not permitted error.
>
> Using 2.4.26, DMA worked fine on the drives. Under 2.4.27, 2.4.28, and 
> 2.4.29 using CONFIG_SCSI_SATA does not allow setting of DMA on the 
> drives, yielding a HDIO_SET_DMA failed: Operation not permitted error, 
> and the transfer speeds reported by hdparm are at about 3MB/s.

I think thats expected. Jeff?

> Under 2.4.29 using CONFIG_BLK_DEV_IDE_SATA the DMA is set fine upon 
> boot, and I get good transfers, hdparm reports 58MB/s on my Western 
> Digital drive. I have not tested using CONFIG_BLK_DEV_IDE_SATA on any 
> previous kernel versions.
> 
> Well, still no crash yet....Again, anything else you want me to try or 
> do just let me know.

Lets wait - this nature of bug can be triggered by flaky hardware. 

If you can't get it to crash without SATA, re-enable it, and get another
couple of oopses please.
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