linux-kernel - Re: 0e334db6bb4b1fd1e2d72c1f3d8f004313cd9f94 (posix-timers: Fix division by zero bug). Problems with glibc.

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Message-ID: <alpine.DEB.2.21.1902012301310.8200@nanos.tec.linutronix.de>
Date:   Fri, 1 Feb 2019 23:04:48 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Alan Mackenzie <acm@....de>
cc:     linux-kernel@...r.kernel.org, 34235@...bugs.gnu.org,
        Eli Zaretskii <eliz@....org>,
        Alex Branham <alex.branham@...il.com>
Subject: Re: 0e334db6bb4b1fd1e2d72c1f3d8f004313cd9f94 (posix-timers: Fix
 division by zero bug). Problems with glibc.

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

Thanks,

	tglx