Re: 2.6.36/2.6.37: broken compatibility with userspace input-utils ?

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On Fri, Jan 28, 2011 at 04:03:07PM -0500, Mark Lord wrote:
> On 11-01-28 03:55 PM, Mark Lord wrote:
> > On 11-01-28 11:42 AM, Dmitry Torokhov wrote:
> >> On Thu, Jan 27, 2011 at 11:53:25AM -0800, Dmitry Torokhov wrote:
> >>> On Thu, Jan 27, 2011 at 01:12:48PM -0500, Mark Lord wrote:
> >>>> On 11-01-27 11:39 AM, Dmitry Torokhov wrote:
> > ..
> >>>>> Hmm, what about compiling with debug and getting a core then?
> >>>>
> >>>> Sure.  debug is easy, -g, but you'll have to tell me how to get it
> >>>> do produce a core dump.
> >>>>
> >>>
> >>> See if adjusting /etc/security/limits.conf will enable it to dump core.
> >>> Otherwise you'll have to stick 'ulimit -c unlimited' somewhere...
> > ..
> >> Any luck with getting the core? I'd really like to resolve this issue.
> > ..
> > 
> > I'm upgrading the box to new userspace now.
> > But I still have the old installation drive,
> > so perhaps I'll go there now and try this.
> > 
> > My plan is to replace /usr/bin/ir-keytable with a script
> > that issues the 'ulimit -c unlimited' command and then
> > invokes the original /usr/bin/ir-keytable binary.
> > 
> > Should take half an hour or so before I get back here again.
> 
> No-go.  According to the syslog, the segfault has not happened
> since I reconfigured the kernel and startup sequence two days
> ago to resolve an XFS mount issue.
> 
> Something in there changed the init timing just enough to make
> it go away, I believe.

OK, this reinforces my suspicion that the cause of segfault is the race
we were discussing with Mauro, not the keymap retrieval fix.

I shall be sending the patch to Linus/stable in the next pull then.

Thank you for your help.

-- 
Dmitry
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