Re: [BUG] ide dma_timer_expiry, then hard lockup

Hello, I wrote:

quoted

I've got a hard lockup in the ide subsystem, probably
due to some irq spew or something like that.

quoted

I've just bought a brand new Maxtor 320GB disk driver for the insane 
price of $70 US to replace another failing drive. It works well under 
light load;
I was able to copy about 60GB to it. However, under heavy load, such 
as reconstruction of an MD RAID-1 array, it'll lock up the kernel.  
Which means
that my system won't boot :-(

quoted

I'm running 2.6.21.1, although the problem seems to occur in 2.6.19 
and 2.6.18 too; its been there a while; I vageuly
remember similar problems in 2.6.5 or 2.6.10.

   Ah... so you're saying that the old disk works OK, yet you've already 
observed alike behavior on other disks... That speaks against 
blacklisting the drive.

    I'm going to shortly post the patches blacklisting the drive and using the 
proper HPT36x enablebits (as much as this stupid design may be fixed :-)...
Please test.

quoted

I can get the system to boot by sneaking in an "hdparm -d0 /dev/hdc" 
early in the boot process, to turn off 

   Could probably do the same trick and specify the lower DMA speed by 
using -X n option (where n ranges from 64 to 70 for UltraDMA modes 0 to 
6) and see if it changes anything...

    Note that for the hpt366.c driver, this is also achievable by setting 
HPT366_ALLOW_ATA66_[34] to 0 and recompiling. It will limit its UltraDMA 
capabilities to modes 2 or 3.

MBR, Sergei