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List:       linux-scsi
Subject:    re: Oops in 2.2.10 with AHA-2940U2W SCSI, Yamaha 4416s CDRW
From:       Benjamin Lewis <bclewis () cs ! sfu ! ca>
Date:       1999-07-24 1:23:13
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On Fri, 23 Jul 1999, Tim Ricketts wrote:

> On Tue, 20 Jul 1999, Benjamin Lewis wrote:
> 
> > (gdb) l *0xc01c6fc3
> > 0xc01c6fc3 is in aic7xxx_handle_scsiint (aic7xxx.c:6197).
> > 6192             * we get a reset since this abort just failed.
> > 6193             */
> > 6194            cmd->result = 0;
> > 6195            scb = NULL;
> 
> Seeing as we've already checked scb isn't NULL, my guess is that the line
> above is getting executed.
> 
> > 6196          }
> > 6197          if (scb->cmd == p->dev_dtr_cmnd[TARGET_INDEX(scb->cmd)])
> 
> So this oopses.  Will this solve the problem?  It certainly can't cause
> any more problems:
*snip*


Thanks. This does indeed seem to prevent the oopses and subsequent system
freezeup. Now I just get into an infinite loop of bus resets. At least now
I can shut my system down safely.

(More info on my problem can be found at
http://kernelnotes.org/lnxlists/linux-kernel/lk_9907_03/msg00969.html
if anyone else is interested in helping me in my predicament :)

Here's the relevent part of the kernel log. In this case, a "mount"
generated several of the timeouts, but then appeared to be successful. The
rest of the errors were generated after a "find ." from the root of the
cdrom.

Jul 23 17:42:46 eusa kernel: scsi : aborting command due to timeout : pid
17, scsi0, channel 0, id 3, lun 0 Test Unit Ready 00 00 00 00 00 
Jul 23 17:43:16 eusa kernel: scsi : aborting command due to timeout : pid
17, scsi0, channel 0, id 3, lun 0 Test Unit Ready 00 00 00 00 00 
Jul 23 17:43:54 eusa kernel: scsi : aborting command due to timeout : pid
34, scsi0, channel 0, id 3, lun 0 Prevent/Allow Medium Removal 00 00 00 00
00 
Jul 23 17:45:17 eusa kernel: scsi : aborting command due to timeout : pid
35, scsi0, channel 0, id 3, lun 0 Test Unit Ready 00 00 00 00 00 
Jul 23 17:45:47 eusa kernel: scsi : aborting command due to timeout : pid
36, scsi0, channel 0, id 3, lun 0 Read TOC 00 00 00 00 00 00 00 0c 00 
Jul 23 17:46:17 eusa kernel: scsi : aborting command due to timeout : pid
36, scsi0, channel 0, id 3, lun 0 Read TOC 00 00 00 00 00 00 00 0c 00 
Jul 23 17:47:16 eusa kernel: scsi : aborting command due to timeout : pid
47, scsi0, channel 0, id 3, lun 0 Read (10) 00 00 00 00 1d 00 00 08 00 
Jul 23 17:47:46 eusa kernel: scsi : aborting command due to timeout : pid
47, scsi0, channel 0, id 3, lun 0 Read (10) 00 00 00 00 1d 00 00 08 00 
Jul 23 17:48:53 eusa kernel: scsi : aborting command due to timeout : pid
49, scsi0, channel 0, id 3, lun 0 Read (10) 00 00 00 00 25 00 00 08 00 
Jul 23 17:49:23 eusa kernel: scsi : aborting command due to timeout : pid
49, scsi0, channel 0, id 3, lun 0 Read (10) 00 00 00 00 25 00 00 08 00 
Jul 23 17:50:02 eusa kernel: scsi : aborting command due to timeout : pid
62, scsi0, channel 0, id 3, lun 0 Read (10) 00 00 00 00 a6 00 00 08 00 
Jul 23 17:50:32 eusa kernel: scsi : aborting command due to timeout : pid
62, scsi0, channel 0, id 3, lun 0 Read (10) 00 00 00 00 a6 00 00 08 00 
Jul 23 17:50:49 eusa kernel: scsi : aborting command due to timeout : pid
108, scsi0, channel 0, id 3, lun 0 Prevent/Allow Medium Removal 00 00 00
00 00 
Jul 23 17:52:08 eusa kernel: scsi : aborting command due to timeout : pid
109, scsi0, channel 0, id 3, lun 0 Test Unit Ready 00 00 00 00 00 
Jul 23 17:52:38 eusa kernel: scsi : aborting command due to timeout : pid
109, scsi0, channel 0, id 3, lun 0 Test Unit Ready 00 00 00 00 00 
Jul 23 17:53:17 eusa kernel: scsi : aborting command due to timeout : pid
126, scsi0, channel 0, id 3, lun 0 Read (10) 00 00 00 00 a6 00 00 08 00 
Jul 23 17:53:47 eusa kernel: scsi : aborting command due to timeout : pid
126, scsi0, channel 0, id 3, lun 0 Read (10) 00 00 00 00 a6 00 00 08 00 
Jul 23 17:54:19 eusa kernel: scsi : aborting command due to timeout : pid
168, scsi0, channel 0, id 3, lun 0 Read (10) 00 00 00 00 87 00 00 08 00 
Jul 23 17:54:19 eusa kernel: (scsi0:0:3:-1) Unexpected busfree, LASTPHASE
= 0xe0, SEQADDR = 0x14f
Jul 23 17:54:50 eusa kernel: SCSI host 0 abort (pid 168) timed out -
resetting
Jul 23 17:54:50 eusa kernel: SCSI bus is being reset for host 0 channel 0.
Jul 23 17:54:50 eusa kernel: (scsi0:0:3:0) Invalid SCB ID 0 is active, SCB
flags = 0x4.
Jul 23 17:54:50 eusa kernel: SCSI host 0 channel 0 reset (pid 168) timed
out - trying harder
Jul 23 17:54:50 eusa kernel: SCSI bus is being reset for host 0 channel 0.
Jul 23 17:55:21 eusa kernel: SCSI host 0 abort (pid 168) timed out -
resetting
Jul 23 17:55:21 eusa kernel: SCSI bus is being reset for host 0 channel 0.
Jul 23 17:55:23 eusa kernel: SCSI host 0 channel 0 reset (pid 168) timed
out - trying harder
Jul 23 17:55:23 eusa kernel: SCSI bus is being reset for host 0 channel 0.
Jul 23 17:55:23 eusa kernel: (scsi0:0:3:0) Performing Domain validation.
Jul 23 17:55:54 eusa kernel: SCSI host 0 abort (pid 168) timed out -
resetting
Jul 23 17:55:54 eusa kernel: SCSI bus is being reset for host 0 channel 0.
Jul 23 17:55:54 eusa kernel: (scsi0:0:3:0) Successfully completed Domain
validation.
Jul 23 17:55:55 eusa kernel: SCSI host 0 channel 0 reset (pid 168) timed
out - trying harder
Jul 23 17:55:55 eusa kernel: SCSI bus is being reset for host 0 channel 0.
Jul 23 17:56:26 eusa kernel: SCSI host 0 abort (pid 168) timed out -
resetting
Jul 23 17:56:26 eusa kernel: SCSI bus is being reset for host 0 channel 0.
Jul 23 17:56:28 eusa kernel: SCSI host 0 channel 0 reset (pid 168) timed
out - trying harder
Jul 23 17:56:28 eusa kernel: SCSI bus is being reset for host 0 channel 0.
Jul 23 17:56:59 eusa kernel: SCSI host 0 abort (pid 168) timed out -
resetting
Jul 23 17:56:59 eusa kernel: SCSI bus is being reset for host 0 channel 0.
Jul 23 17:57:00 eusa kernel: SCSI host 0 channel 0 reset (pid 168) timed
out - trying harder
Jul 23 17:57:00 eusa kernel: SCSI bus is being reset for host 0 channel 0.

... ad infinitum 

-- 
Benjamin Lewis

...the Soviets have the capability to try big projects.  If there is a goal,
such as when Gorbachev states that they are going to have nuclear-powered
aircraft carriers, the case is closed -- that is it.  They will concentrate
on the problem, do a bad job, and later pay the price.  They really don't
care what the price is.
-- Victor Belenko, MiG-25 fighter pilot who defected in 1976
   "Defense Electronics", Vol 20, No. 6, pg. 100


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