Messages in this thread | | | Date | Fri, 20 Aug 2010 20:44:59 -0700 | From | "H. Peter Anvin" <> | Subject | Re: Linux 2.6.35.3 |
| |
On 08/20/2010 08:40 PM, Mark Stanovich wrote: > After updating to the 2.6.35.3 stable release, my machine was rebooting > automatically during the first few seconds of boot. > > I bisected to the first bad commit of > > commit 568132624386f53e87575195d868db > 9afb2e9316 > Author: H. Peter Anvin <hpa@zytor.com <mailto:hpa@zytor.com>> > Date: Tue Jul 27 17:01:49 2010 -0700 > > x86: Add memory modify constraints to xchg() and cmpxchg() > > commit 113fc5a6e8c2288619ff7e8187a6f556b7e0d372 upstream. > > xchg() and cmpxchg() modify their memory operands, not merely read > them. For some versions of gcc the "memory" clobber has apparently > dealt with the situation, but not for all. > > I noticed that the latest version pulled from Linus's git tree did not > have the problem. After looking at the changes to > arch/x86/include/asm/cmpxchg_32.h, I cherry-picked two patches from > Linus's tree that seemed to make a difference, namely: > > 69309a05907546fb686b251d4ab041c26afe1e1d > 4532b305e8f0c238dd73048068ff8a6dd1380291 > > Applying these patches solved the rebooting problem on 2.6.35.3 > > I believe the same problem also happens for the latest stable version of > 2.6.34, but did not verify the fix worked for the 2.6.34 stable releases. > > I don't know if this is helpful, but I thought I would let you know in > case someone else is having the same problem. > > If you need any further information, just let me know. >
Yes, as a matter of fact, we have been trying to root-cause this problem; please see:
https://bugzilla.kernel.org/show_bug.cgi?id=16612
If you could try the one-liner in there and see if it solves your problem, it would be great.
-hpa
P.S. What version of gcc do you use?
-- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.
| |