Bug#762670: libjavascriptcoregtk-3.0-0: crashes on ppc64el when building sphinx

[Dmitry Shachnev]

Package: libjavascriptcoregtk-3.0-0
Version: 2.4.4-1

Dear maintainers,

In Ubuntu, I noticed that sphinx autopkgtest consistently fails on ppc64el.

The autopkgtest calls debian/jstest/run-tests Python script, which creates
(via introspection) a web view, loads a page (which executes some javascript),
and performs some checks on the resulting HTML code. The same script is called
when building Sphinx package (which is probably the easiest way to reproduce
this crash).

The latest backtrace I have access to is [1]. Here is the beautified stacktrace
head:

1  0x3fff89e80bbc  libjavascriptcoregtk-3.0.so.0  WTFCrash+0x3c
2  0x3fff89ea1e40  libjavascriptcoregtk-3.0.so.0  WTF::OSAllocator::commit(void*, unsigned long, bool, bool)+0x60
3  0x3fff89bffc80  libjavascriptcoregtk-3.0.so.0  JSC::JSStack::growSlowCase(JSC::Register*)+0xc0
4  0x3fff89bfdca8  libjavascriptcoregtk-3.0.so.0  JSC::JSStack::entryCheck(JSC::CodeBlock*, int)+0xe8
5  0x3fff89bfc858  libjavascriptcoregtk-3.0.so.0  JSC::Interpreter::execute(JSC::ProgramExecutable*, JSC::ExecState*, JSC::JSObject*)+0x1308
6  0x3fff89cf8bec  libjavascriptcoregtk-3.0.so.0  JSC::evaluate(JSC::ExecState*, JSC::SourceCode const&, JSC::JSValue, JSC::JSValue*)+0x2ec
7  0x3fff8a62dc68  libwebkitgtk-3.0.so.0          +0x6ddc68

[1] https://jenkins.qa.ubuntu.com/view/Utopic/view/AutoPkgTest%20ppc64el/job/utopic-adt-sphinx-ppc64el/9/console

I believe this affects Debian as well, if it does not, please let me know, and
I will bug Ubuntu ppc64el porters.

--
Dmitry Shachnev
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