Re: [BUG] ide dma_timer_expiry, then hard lockup

Linas Vepstas wrote:

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

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 :-(

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 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...

the use of DMA, but it seems that PIO is so slow, that it takes 
forever to get NFS started.

    You can use 'ide=nodma' kernel option for this.

MBR, Sergei