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Date: Wed, 22 Oct 2014 10:58:47 +0300
From: Timo Teras <>
To: 黄建忠 <>
Cc:, Rich Felker <>
Subject: Re: musl pthread/tls issue.

On Wed, 22 Oct 2014 14:33:01 +0800
黄建忠 <> wrote:

> Hi, Rich and all.
> These days, I finished build a bootable x86_64 system(rpm based)
> include musl/systemd/dracut/gcc-4.9.1/gcc-5/clang-3.5 and
> wayland/Xorg and the whole GNOME-3.14 desktop(except webkit js
> segfault issue I mentioned before) with a lot of patches(I will
> release all of them someday until it reach a stable state.)
> After a simple try, I found gnome-shell will segfault If I triggered
> the app list(not always but often).
> The dmesg report "pool [<some pid>] segfault xxxxxxxxxxx
> libpixman-xxxxx", That's to say, it segfault in pixman library(A
> common library used by Xorg and cairo),
> gdb report it's a thread issue(a thread of gnome-shell) and segfault
> at the beginning of general_composite_rect function in
> pixman-general.c, the pointer of argument can not be accessed.
> And after a quick look, the problem is in pixman-compiler.h, it
> defined TLS related codes and macros according to specific
> implementation(win32/mingw/pthread and so on).
> By default, the TLS codes will be compiled, if it was disabled, there
> is still a pthread fallback use 'pthread_key_create' and other
> pthread funcs.
> Here is the link to it:
> please look at the TLS section.
> That's to say, there must be a problem exist in musl pthread/tls
> implementation and can be triggered under certain circumstances.
> Please help to solve it.
> Related components:
> Kernel: linux-3.17.0 without patch.
> binutils: 2.24.90 without patch.
> Compiler: gcc-5 and clang-3.5. with musl-enable patch.
> Pixman: 0.32.6 git
> Cairo: 1.14.0
> Mesa: 10.3.1 stable
> Xorg: 1.16.1 stable
> gnome: 3.14 stable

Is it perhaps this:

Does preloading help?

We do this as workaround for eg. firefox currently (in Alpine Linux):


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