Re: 0e334db6bb4b1fd1e2d72c1f3d8f004313cd9f94 (posix-timers: Fix division by zero bug). Problems with glibc.
From: Alan Mackenzie
Date: Sat Feb 02 2019 - 05:45:53 EST
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
Alan Mackenzie (Nuremberg, Germany).