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Bug 488989

Summary: Mid-layer underflow detected message from qla2xxx
Product: Red Hat Enterprise Linux 4 Reporter: Jan Tluka <jtluka>
Component: kernelAssignee: Red Hat Kernel Manager <kernel-mgr>
Status: CLOSED WONTFIX QA Contact: Red Hat Kernel QE team <kernel-qe>
Severity: medium Docs Contact:
Priority: low    
Version: 4.8CC: ffotorel, jcavallaro, jwest, mgahagan
Target Milestone: rc   
Target Release: ---   
Hardware: ppc64   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2012-06-14 20:06:23 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
RHTS messages log none

Description Jan Tluka 2009-03-06 16:42:35 UTC 
Description of problem:
When testing internal beta of RHEL4.8 I hit one message from qla2xxx driver.
--
qla2300 0000:01:01.0: scsi(0:0:0:1): Mid-layer underflow detected (c000 of c000 bytes)...returning error status.
--
This gets repeated many times.
(full log available here: http://rhts.redhat.com/testlogs/48839/164792/1378770/messages)

I see this on RHTS system ibm-js20-02.lab.bos.redhat.com when running
stress test on the kernel (/kernel/distribution/stress-kernel).
http://rhts.redhat.com/cgi-bin/rhts/jobs.cgi?id=48839

Version-Release number of selected component (if applicable):
RHEL4-U8-re20090227.1
kernel 2.6.9-82.EL

How reproducible:
Not sure, but message appears when running stress test on specific system in RHTS.

Steps to Reproduce:
1. Run /kernel/distribution/stress-kernel test on RHTS system ibm-js20-02.lab.bos.redhat.com.
2. Check messages log for the qla2xxx message

Actual results:
Following message appears on console:
qla2300 0000:01:01.0: scsi(0:0:0:1): Mid-layer underflow detected (c000 of c000 bytes)...returning error status.

Expected results:
No underflow detected.

Additional info:
I've been searching in bugzilla and found bug for RHEL5.4 that seems to be related (same message appears there): bug 470510
However I did not hit panic.

This message was present in 4.7, too, so this is not a regression.
See RHTS job http://rhts.redhat.com/cgi-bin/rhts/jobs.cgi?id=40612
Comment 1 Jan Tluka 2009-03-06 16:52:54 UTC 
Created attachment 334321 [details]
RHTS messages log

The log from RHTS job, look for string qla2300.
Comment 2 RHEL Program Management 2009-03-12 18:56:16 UTC 
Since RHEL 4.8 External Beta has begun, and this bugzilla remains 
unresolved, it has been rejected as it is not proposed as exception or 
blocker.