Bug 11876

Summary:	RCU hang on cpu re-hotplug with 2.6.27rc8
Product:	Other	Reporter:	Rafael J. Wysocki (rjw)
Component:	Other	Assignee:	other_other
Status:	CLOSED CODE_FIX
Severity:	normal	CC:	andi-bz, liaoclarke
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.27-rc8	Subsystem:
Regression:	Yes	Bisected commit-id:
Bug Depends on:
Bug Blocks:	11167

Description Rafael J. Wysocki 2008-10-28 09:08:59 UTC

Subject    : RCU hang on cpu re-hotplug with 2.6.27rc8
Submitter  : Andi Kleen <andi@firstfloor.org>
Date       : 2008-10-06 23:28
References : http://marc.info/?l=linux-kernel&m=122333610602399&w=2
Handled-By : "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>

This entry is being used for tracking a regression from 2.6.26.  Please don't
close it until the problem is fixed in the mainline.

Comment 1 Rafael J. Wysocki 2008-12-13 10:46:15 UTC

Andi, does it still happen with the current mainline?

Comment 2 Rafael J. Wysocki 2009-01-11 05:11:36 UTC

This problem appears to have been fixed in current mainline.  Closing.

Comment 3 liaoclarke 2012-12-08 07:27:15 UTC

Rafael, I meet the same problem on 2.6.27-rc7 when testing cpu hotplug on a 4 core SMP machine,
then I go through the history of mainline, find one commit (2133b5d7)which looks like to be related to this bug, but its content is adding a debugging feature on classic RCU, not a bug fix, so do you know in which commit i could find out the solution, thanks.