Bug 84928

Summary: Possible deadlock under heavy load
Product: Red Hat Enterprise Linux 2.1 Reporter: Larry Troan <ltroan>
Component: kernelAssignee: Larry Woodman <lwoodman>
Status: CLOSED WORKSFORME QA Contact: Brian Brock <bbrock>
Severity: medium Docs Contact:
Priority: medium    
Version: 2.1CC: ichute, tao
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2004-07-19 19:13:09 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On:    
Bug Blocks: 116726    

Description Larry Troan 2003-02-23 23:09:52 UTC
This fix has been accepted in 2.5

http://linux.bkbits.net:8080/linux-2.5/cset@1.1005?nav=index.html|ChangeSet@-1d

cut-n-paste from the checkin message:

We\'re calling mmdrop() under spin_lock_irq(&rq->lock).  But mmdrop
calls vfree(), which calls smp_call_function().

It is not legal to call smp_call_function() with irq\'s off.  Because
another CPU may be running smp_call_function() against _this_ CPU, which
deadlocks.

Our read of the code is that AS 2.1 is also susceptible to this problem.

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Action by: arunsharma
Issue Registered

ISSUE TRACKER 16281 by Intel as sev 3

Comment 3 Tim Burke 2004-05-17 15:52:27 UTC
Is a customer really hitting this bug?


Comment 4 Larry Woodman 2004-06-23 14:14:48 UTC
We could never locate the patch thats being referenced here.  Please
provide a link to the actual patch.

Larry