[Unity 5.10] compiz crashed with SIGSEGV in unity::hud::HudIconTextureSource::ColorForIcon() from unity::hud::Icon::Icon() from emit from unity::IconTexture::IconLoaded

StacktraceTop:
 unity::hud::HudIconTextureSource::ColorForIcon (this=0x3700e50, pixbuf=<optimized out>) at /build/buildd/unity-5.10.0/plugins/unityshell/src/HudIconTextureSource.cpp:51
 unity::hud::Icon::Icon(std::string const&, unsigned int)::{lambda(nux::BaseTexture*)#1}::operator()(nux::BaseTexture*) const () at /build/buildd/unity-5.10.0/plugins/unityshell/src/HudIcon.cpp:50
 emit (_A_a1=@0x7fff476a48b0, impl=<optimized out>) at /usr/include/sigc++-2.0/sigc++/signal.h:1010
 emit (_A_a1=@0x7fff476a48b0, this=<optimized out>) at /usr/include/sigc++-2.0/sigc++/signal.h:2781
 unity::IconTexture::IconLoaded (this=0x2651c90, icon_name=<optimized out>, size=<optimized out>, pixbuf=<optimized out>) at /build/buildd/unity-5.10.0/plugins/unityshell/src/IconTexture.cpp:178

Status changed to 'Confirmed' because the bug affects multiple users.

Seems like a regression (or just incomplete fix) of bug 935307.

I think we can fix in some ways:
 1) IconTexture should inherit sigc::trackable
 2) removing the lambda in HudIcon and use sigc::mem_fun
 3) Do texture_updated.clear() in ~HudIcon.

Oh I've also noticed that _pixbuf_cached is not initialized in IconTexture. It should be set before emitting the signal, but maybe that's the corner problem...

Hello Bulat, or anyone else affected,

Accepted unity into precise-proposed. The package will build now and be available in a few hours. Please test and give feedback here. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you in advance!

This bug was fixed in the package unity - 5.12-0ubuntu1

---------------
unity (5.12-0ubuntu1) precise-proposed; urgency=low

  * New upstream release.
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    - [Unity 5.10] compiz crashed with SIGSEGV in
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      fro...