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Bug 234447

Summary: BUG_ON(!entry) in shmem_writepage() is triggered in rare circumstances
Product: Red Hat Enterprise Linux 5 Reporter: Michal Schmidt <mschmidt>
Component: kernelAssignee: Michal Schmidt <mschmidt>
Status: CLOSED ERRATA QA Contact: Martin Jenner <mjenner>
Severity: high Docs Contact:
Priority: high    
Version: 5.0CC: doughnut, jacob, lwoodman, nphilipp, peterm, tao
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: RHBA-2007-0959 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2007-11-07 19:45:44 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:

Comment 1 Michal Schmidt 2007-03-29 12:02:51 UTC
I've checked the patch proposed in attachment #151181 fixes the bug.

Comment 2 RHEL Product and Program Management 2007-03-29 21:46:03 UTC
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update

Comment 3 Michal Schmidt 2007-04-06 10:04:40 UTC
The fix is incomplete. I was able to trigger slab corruption with it. Upstream
has fixed it with a series of 4 patches from Hugh Dickins ("holepunch: ...", git
commit 90ed52ebe48181d3c5427b3bd1d24f659e7575ad). These seem to work reliably.

Comment 4 RHEL Product and Program Management 2007-04-17 19:22:11 UTC
This request was evaluated by Red Hat Kernel Team for inclusion in a Red
Hat Enterprise Linux maintenance release, and has moved to bugzilla 
status POST.

Comment 5 Don Zickus 2007-06-12 18:47:06 UTC
in 2.6.18-24.el5
You can download this test kernel from

Comment 6 Michal Schmidt 2007-06-22 18:49:37 UTC
I tested 2.6.18-27.el5 and ran the testcase for 6 hours. The bug is fixed.

Comment 8 Mike Gahagan 2007-09-20 15:17:51 UTC
testcase has run overnight on one of my test systems, no issues so far. 

Comment 9 Dave Fogarty 2007-09-28 23:56:06 UTC
What is the status of this bug?  Is an official RHEL5 kernel available?  We are
actually seeing this in the wild and would like it to stop.

Comment 12 errata-xmlrpc 2007-11-07 19:45:44 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 the 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.