Re: Bug in aic94xx driver in 2.6.25-rc3

Re: Bug in aic94xx driver in 2.6.25-rc3

[peter]

My original post was user error and not acutally a bug.  I didn't
realize that there was another patch I need to apply to rc3 to get the
latest scsi drivers and error handler code.  Alexis clued me in.  Now
the error handler appears to be working properly.  I included a sample
at the bottom of this email.  

I am still seeing the disk go offline if I run i/o performance tests on
sas disks connected to the aic94xx (sequencer version 32).  It doesn't
happen right away.  The i/o tests will run for several hours before it
fails.  Eventually you see the filesystem abort and then be remounted as
read only.

Peter Bogdanovic
IBM




sas: command 0xffff810142569200, task 0xffff81022ad27980, timed out:
EH_NOT_HANDLED^M
sas: Enter sas_scsi_recover_host^M
sas: trying to find task 0xffff81022ad27980^M
sas: sas_scsi_find_task: aborting task 0xffff81022ad27980^M
aic94xx: tmf tasklet complete^M
aic94xx: tmf resp tasklet^M
aic94xx: tmf came back^M
aic94xx: task not done, clearing nexus^M
aic94xx: asd_clear_nexus_tag: PRE^M
aic94xx: asd_clear_nexus_tag: POST^M
aic94xx: asd_clear_nexus_tag: clear nexus posted, waiting...^M
aic94xx: task 0xffff81022ad27980 done with opcode 0x23 resp 0x0 stat
0x8d but aborted by upper layer!^M
aic94xx: asd_clear_nexus_tasklet_complete: here^M
aic94xx: asd_clear_nexus_tasklet_complete: opcode: 0x0^M
aic94xx: came back from clear nexus^M
aic94xx: task 0xffff81022ad27980 aborted, res: 0x0^M
sas: sas_scsi_find_task: task 0xffff81022ad27980 is done^M
sas: sas_eh_handle_sas_errors: task 0xffff81022ad27980 is done^M
sd 0:0:3:0: [sdd] Result: hostbyte=DID_ABORT
driverbyte=DRIVER_OK,SUGGEST_OK^M
end_request: I/O error, dev sdd, sector 27106623^M
sas: --- Exit sas_scsi_recover_host^M

Re: Bug in aic94xx driver in 2.6.25-rc3

[James Bottomley]

On Wed, 2008-02-27 at 14:39 -0800, peter wrote:
> My original post was user error and not acutally a bug.  I didn't
> realize that there was another patch I need to apply to rc3 to get the
> latest scsi drivers and error handler code.  Alexis clued me in.  Now
> the error handler appears to be working properly.  I included a sample
> at the bottom of this email.  
> 
> I am still seeing the disk go offline if I run i/o performance tests on
> sas disks connected to the aic94xx (sequencer version 32).  It doesn't
> happen right away.  The i/o tests will run for several hours before it
> fails.  Eventually you see the filesystem abort and then be remounted as
> read only.

Yes, I've seen this one too.  in my case it's caused by error handling
tripping a flutter on the disk phy, so the HBA actually sees an
unplug/replug event, but that causes the disk to go offline (even though
it actually reappears almost immediately).  I have that on my list of
things to fix ... probably by stealing the devloss tmo from fc.

James