Re: IDE(?) lockups in 2.5.7pre1, 2.5.6, 2.5.6pre3

[Martin Dalecki <dalecki@evision-ventures.com>]

Adam J. Richter wrote:
> 	Under 2.5.6-pre3 and 2.5.6, my desktop workstation would
> occasionally get into a state where all disk I/O would block.
> Process would run until they had to go to the disk, and then they
> would stop.  Hitting ctrl-<scroll lock> shows these process in "D"
> state.  The IDE controller in this machine is:
> 
> 00:07.1 IDE interface: VIA Technologies, Inc. VT82C586 IDE [Apollo] (rev 06)
> 
> 	I just built 2.5.7-pre1 and have discovered the other machne
> that has a VIA IDE controller developed the same problem just after
> printing its first "login: " prompt, although it did not have the problem
> on a subsequent reboot.  This other machine did not lock up with
> 2.5.6-pre3 or 2.5.6, although that is probably just due to random
> chance, as the problem was occurring only once a day.  The
> IDE controller in this second machine is:
> 
> 00:04.1 IDE interface: VIA Technologies, Inc. VT82C586 IDE [Apollo] (rev 10)
> 
> 	I will try to track this down from the process stack traces
> when it happens next, but I thought I ought to report it in the meantime.
> 

You may have noted that I'm gradually trying to replace
all cli() sti() stuff, where it's using for data structure
access by proper spin locks on ide_lock. Maybe this just
uncovered something which was hidden by the brute force used
before? (Could you possible have a look at this direction?)