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Bug 638868

Summary: race in aio_complete() leads to process hang [rhel-5.3.z]
Product: Red Hat Enterprise Linux 5 Reporter: RHEL Program Management <pm-rhel>
Component: kernelAssignee: Jiri Pirko <jpirko>
Status: CLOSED ERRATA QA Contact: Red Hat Kernel QE team <kernel-qe>
Severity: urgent Docs Contact:
Priority: urgent    
Version: 5.4CC: bmr, cward, dhoward, dzickus, jmoyer, jpirko, jwest, pbenas, pm-eus, rkhan, tao
Target Milestone: rcKeywords: ZStream
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2010-11-16 19:09:07 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:
Bug Depends On: 475814    
Bug Blocks:    

Description RHEL Program Management 2010-09-30 07:47:17 UTC 
This bug has been copied from bug #475814 and has been proposed
to be backported to 5.3 z-stream (EUS).
Comment 5 Jiri Pirko 2010-10-25 16:01:01 UTC 
in kernel 2.6.18-128.26.1.el5

linux-2.6-fs-aio-race-in-aio_complete-leads-to-process-hang.patch
Comment 7 Petr Beňas 2010-11-09 11:00:47 UTC 
The reproducer remains unknown.
According http://lkml.org/lkml/2008/3/12/207 the bug was reproduced on eight Xeon machine. I've tested heavy aio multithreaded reads with aio-stress on machine with eight Xeons. I've never triggered the hang on unpatched -128.25.1.el5 nor patched -128.26.1.el5.
Comment 8 Petr Beňas 2010-11-09 11:19:19 UTC 
code review.
Verified the patch is actually being applied in 2.6.18-128.26.el5 source.
Comment 10 errata-xmlrpc 2010-11-16 19:09:07 UTC 
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2010-0893.html