Bug 9973

Summary: My mm-mystery-crash has now sneaked into mainline
Product: Memory Management Reporter: Rafael J. Wysocki (rjw)
Component: Slab AllocatorAssignee: Andrew Morton (akpm)
Status: CLOSED CODE_FIX    
Severity: normal CC: clameter, just.for.lkml, mingo, stefanr
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 2.6.25-rc1 Subsystem:
Regression: Yes Bisected commit-id:
Bug Depends on:    
Bug Blocks: 9832    
Attachments: OOPS from 2.6.25-rc2-mm1

Description Rafael J. Wysocki 2008-02-13 15:23:07 UTC 
Subject         : My mm-mystery-crash has now sneaked into mainline
Submitter       : "Torsten Kaiser" <just.for.lkml@googlemail.com>
Date            : 2008-02-11 22:46
References      : http://lkml.org/lkml/2008/2/11/424
Handled-By      : Stefan Richter <stefanr@s5r6.in-berlin.de>

This entry is being used for tracking a regression from 2.6.24.  Please don't
close it until the problem is fixed in the mainline or the report is rejected.
Comment 1 Stefan Richter 2008-02-15 01:11:49 UTC 
Two corrections:
  - There is no evidence that this is a drivers/ieee1394 bug.
  - There isn't anybody handling this bug.
Comment 2 Rafael J. Wysocki 2008-02-17 12:25:34 UTC 
References : http://lkml.org/lkml/2008/2/16/267
Comment 3 Torsten Kaiser 2008-02-17 13:29:01 UTC 
OK, 2.6.25-rc2-mm1 did also die, this one with left a better OOPS. I will attached this info, when I'm done with this comment.

The first reference is a summary what I found, I also posted a message linking to all the crashed I posted to the lkml that I think are cause by this:
http://lkml.org/lkml/2008/2/13/452

I guess something is corrupting skbs or lists of skbs and Stefans ieee1394 is just hit, because I'm using it as the main network on this system. But it also crashed with a real ethernet (tg3 driver).

What I don't really understand is, that the skbs seem to come from SLUB, but turning on slub_debug via kernel commandline only slowed the system down (ok normal) and made it more difficult to provoke the crash, but did not result in additional warnings or errors.
Comment 4 Torsten Kaiser 2008-02-17 13:30:20 UTC 
Created attachment 14877 [details]
OOPS from 2.6.25-rc2-mm1
Comment 5 Torsten Kaiser 2008-02-19 11:31:19 UTC 
The revert-patch from http://lkml.org/lkml/2008/2/19/231 fixes this for me and seems to be current best way to fix this.