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Date: Sat, 14 Jan 2017 15:30:50 -0600
From: "A. Wilcox" <>
Subject: Re: Reviving planned ldso changes

On 04/01/17 13:36, Rich Felker wrote:
> Here's a v2 of the patch with the above issues fixed, and some
> comments that hopefully make it make sense. I still think there's more
> logic needed to allow concurrent ctors from unrelated dlopen in
> multiple threads, though.
> Rich

Applied to this to Adélie's musl package in a dev overlay and rebooted a
box with this patch applied.

What a fantastic little show!

iv_tls_user_ptr: called on unregistered iv_tls_user
/etc/init.d/syslog-ng: line 34:  2560 Aborted                 syslog-ng
 * ERROR: syslog-ng failed to start

When X tried to start up, further fireworks:

/usr/bin/startkde: line 384:  2638 Segmentation fault      kwrapper5
/usr/bin/ksmserver $KDEWM $KSMSERVEROPTIONS

Starting program: /usr/bin/kwrapper5 /usr/bin/ksmserver
process 3281 is executing new program: /usr/bin/ksmserver
[New LWP 3287]

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff009938b in operator== (s1=..., s2=...) at tools/qstring.cpp:2686
2686    tools/qstring.cpp: No such file or directory.
(gdb) bt
#0  0x00007ffff009938b in operator== (s1=..., s2=...) at
#1  0x00007fffe2af2ae4 in operator!= (s2=..., s1=...) at
#2  KHintsSettings::KHintsSettings (this=0x7fffe65829c0, kdeglobals=...)

Where khintssettings.cpp contains:

68    const QString looknfeel = cg.readEntry("LookAndFeelPackage",
70    if (looknfeel != defaultLookAndFeelPackage) {

And defaultLookAndFeelPackage is defined earlier in the source file as a

static const QString defaultLookAndFeelPackage =

We can see that defaultLookAndFeelPackage was not initialised correctly:

(gdb) printqs5static looknfeel
$9 = (Qt5 QString)0xffffdde0 length=22: "org.kde.breeze.desktop"
(gdb) printqs5static defaultLookAndFeelPackage
$10 = (Qt5 QString)0xe2d0be90 length=Cannot access memory at address 0x4

It therefore seems to me that this patch still needs some refining.


A. Wilcox (awilfox)
Open-source programmer (C, C++, Python)

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