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From: Thomas Gleixner <tglx@linutronix.de>
To: Alan Mackenzie <acm@muc.de>
Cc: Alex Branham <alex.branham@gmail.com>,
	Paul Eggert <eggert@cs.ucla.edu>,
	Greg KH <gregkh@linuxfoundation.org>,
	LKML <linux-kernel@vger.kernel.org>,
	34235@debbugs.gnu.org
Subject: bug#34235: 0e334db6bb4b1fd1e2d72c1f3d8f004313cd9f94 (posix-timers: Fix division by zero bug). Problems with glibc.
Date: Mon, 4 Feb 2019 17:25:11 +0000 (GMT)	[thread overview]
Message-ID: <alpine.DEB.2.21.1902041724200.3006__8328.78351663879$1549301175$gmane$org@nanos.tec.linutronix.de> (raw)
In-Reply-To: <20190202104404.GA1067@ACM>

On Sat, 2 Feb 2019, Alan Mackenzie wrote:
> Hello, Thomas.
> 
> Thanks for such a rapid reply!
> 
> On Fri, Feb 01, 2019 at 23:04:48 +0100, Thomas Gleixner wrote:
> > Hello Alan,
> 
> > On Fri, 1 Feb 2019, Alan Mackenzie wrote:
> > > 0e334db6bb4b1fd1e2d72c1f3d8f004313cd9f94
> > > posix-timers: Fix division by zero bug
> > > Committed: 2018-12-17 17:35:45 +0100
> 
> > > With this patch in place I am seeing problems with glibc's function
> > > timer_create.  I am an Emacs maintainer, and saw these problems whilst
> > > investigating Emacs bug #34235 "27.0.50; lisp profiler does not work".
> 
> > > Emacs's profiler fails in kernel 4.19.13, but works in a version of
> > > 4.19.13 with the patch reversed, otherwise unchanged.  My current version
> > > of glibc is 2.27-r6 (I think the "-r6" comes from Gentoo, my distro).
> 
> > Please upgrade to 4.19.19. The issue should be fixed there with the
> > backported variant of
> 
> >    93ad0fc088c5 ("posix-cpu-timers: Unbreak timer rearming")
> 
> > Commit 21c0d1621b8d4b in 4.19.19
> 
> I've just built and installed Linux 4.19.19, and it does indeed solve
> the Emacs profiler bug, #34235.  :-)
> 
> I see that the patch has been installed in 4.20.6, 4.19.19, and 4.14.97.
> Are there any plans to install it into 4.9.x, the other live long term
> support branch?  The reason I ask is to make an entry into Emacs's
> PROBLEMS file, telling users and distributions which kernel versions to
> upgrade to.

4.9 doesn't have the offending commit AFAICT.

Thanks,

	tglx





  parent reply	other threads:[~2019-02-04 17:25 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-28 18:34 bug#34235: 27.0.50; lisp profiler does not work Alex Branham
2019-01-29 16:06 ` Eli Zaretskii
2019-01-30 13:33   ` Alan Mackenzie
2019-01-30 15:40     ` Alex Branham
2019-01-30 16:15       ` Alan Mackenzie
2019-01-30 16:23         ` Alex Branham
2019-01-30 16:43           ` Eli Zaretskii
2019-01-30 20:47             ` Alex Branham
2019-01-30 16:41         ` Eli Zaretskii
2019-01-30 15:48     ` Eli Zaretskii
2019-02-01 21:47 ` bug#34235: 0e334db6bb4b1fd1e2d72c1f3d8f004313cd9f94 (posix-timers: Fix division by zero bug). Problems with glibc Alan Mackenzie
2019-02-01 22:04   ` Thomas Gleixner
     [not found]   ` <alpine.DEB.2.21.1902012301310.8200@nanos.tec.linutronix.de>
2019-02-02 10:44     ` Alan Mackenzie
     [not found]     ` <20190202104404.GA1067@ACM>
2019-02-04 17:25       ` Thomas Gleixner [this message]
     [not found]       ` <alpine.DEB.2.21.1902041724200.3006@nanos.tec.linutronix.de>
2019-02-05 13:54         ` Alan Mackenzie
2019-02-02  2:07 ` bug#34235: 0e334db6bb4b1fd1e2d72c1f3d8f004313cd9f94 (posix-timers: Fix, " Paul Eggert
2019-02-02  9:21   ` Thomas Gleixner
2019-02-02 14:02   ` Alex Branham
     [not found]   ` <alpine.DEB.2.21.1902021020020.8200@nanos.tec.linutronix.de>
2019-02-03  6:28     ` Paul Eggert

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