Bug#839397: libwebkit2gtk-4.0-37: gobject-introspection on package build with webkit2gtk fails without active X session

Sun Oct 2 17:53:06 UTC 2016

On Sat, 01 Oct 2016 14:42:55 +0200 Paul Gevers <elbrus at debian.org> wrote:
> Do you need more info?

I dug into this a little bit more. In a jessie pbuilder, the build
succeeds. I added sid to the /etc/apt/sources.conf and then started to
add packages that are required for "apt install libwebkit2gtk-4.0-dev"
except for the src:webkit2gtk packages. The build still succeeds, while
updating src:webkit2gtk packages causes liferea to FTBFS. I then started
bisecting which version of webkit2gtk was the first one to fail with the
aid of snapshot.d.o.

Upto 2.13.4-1+b2 succeeded, while with 2.13.91-1 it FTBFS.

The packages that were upgrade from 2.13.4-1+b2 to 2.13.91-1 were:
gir1.2-javascriptcoregtk-4.0
gir1.2-webkit2-4.0
libjavascriptcoregtk-4.0-18
libjavascriptcoregtk-4.0-dev
libwebkit2gtk-4.0-37
libwebkit2gtk-4.0-dev

Hope this helps. At least I now confirm that the issue lies with the
webkit2gtk source package.

I also added the debug section of the archive to improve the stack trace
(state of today). Please find that attached.

Paul

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(pbuild4862) testavoira liferea-1.12~rc1 # gdb src/liferea
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Reading symbols from src/liferea...done.
(gdb) run --introspect-dump=/tmp/xx,/tmp/yy
Starting program: /build/liferea-1.12~rc1/src/liferea --introspect-dump=/tmp/xx,/tmp/yy
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffe105d700 (LWP 20629)]

Thread 1 "liferea" received signal SIGSEGV, Segmentation fault.
XQueryExtension (dpy=dpy at entry=0x0, 
    name=name at entry=0x7fffea65d721 <XCompositeExtensionName> "Composite", 
    major_opcode=major_opcode at entry=0x7fffffffcbc4, first_event=first_event at entry=0x7fffffffcbc8, 
    first_error=first_error at entry=0x7fffffffcbcc) at ../../src/QuExt.c:43
43      ../../src/QuExt.c: No such file or directory.
(gdb) bt
#0  0x00007fffea8980ad in XQueryExtension (dpy=dpy at entry=0x0, name=name at entry=0x7fffea65d721 <XCompositeExtensionName> "Composite", major_opcode=major_opcode at entry=0x7fffffffcbc4, first_event=first_event at entry=0x7fffffffcbc8, first_error=first_error at entry=0x7fffffffcbcc) at ../../src/QuExt.c:43
#1  0x00007fffea88be92 in XInitExtension (dpy=dpy at entry=0x0, name=name at entry=0x7fffea65d721 <XCompositeExtensionName> "Composite") at ../../src/InitExt.c:47
#2  0x00007fffea65cfe0 in XCompositeFindDisplay (extinfo=0x7fffea85e090 <XCompositeExtensionInfo>, ext_name=<optimized out>, dpy=0x0) at ../../src/Xcomposite.c:111
#3  0x00007fffea65cfe0 in XCompositeFindDisplay (dpy=0x0) at ../../src/Xcomposite.c:208
#4  0x00007fffea65d141 in XCompositeQueryExtension (dpy=<optimized out>, event_base_return=event_base_return at entry=0x7fffffffcc78, error_base_return=error_base_return at entry=0x7fffffffcc7c)
    at ../../src/Xcomposite.c:219
#5  0x00007ffff63e7033 in WebCore::PlatformDisplayX11::supportsXComposite() const (this=this at entry=
    0x7fffe07fb040) at ./Source/WebCore/platform/graphics/x11/PlatformDisplayX11.cpp:80
#6  0x00007ffff55b373d in WebKit::WebPreferences::platformInitializeStore() (this=0x7fffe07fc000)
    at ./Source/WebKit2/UIProcess/gtk/WebPreferencesGtk.cpp:63
#7  0x00007ffff53b7532 in WebKit::WebPreferences::create(WTF::String const&, WTF::String const&, WTF::String const&) (identifier=..., keyPrefix=..., globalDebugKeyPrefix=...)
    at ./Source/WebKit2/UIProcess/WebPreferences.cpp:43
#8  0x00007ffff5570913 in webkit_settings_init(WebKitSettings*) (this=0x6c4ba0)
    at ./Source/WebKit2/UIProcess/API/gtk/WebKitSettings.cpp:51
#9  0x00007ffff5570913 in webkit_settings_init(WebKitSettings*) (self=<optimized out>)
    at ./Source/WebKit2/UIProcess/API/gtk/WebKitSettings.cpp:94
#10 0x00007ffff2c8b34b in g_type_create_instance (type=<optimized out>) at ././gobject/gtype.c:1866
#11 0x00007ffff2c6d1fb in g_object_new_internal (class=class at entry=0x6c6710, params=params at entry=0x0, n_params=n_params at entry=0) at ././gobject/gobject.c:1783
#12 0x00007ffff2c6ec0d in g_object_newv (object_type=object_type at entry=7111056, n_parameters=n_parameters at entry=0, parameters=parameters at entry=0x0) at ././gobject/gobject.c:1930
#13 0x00007ffff2c6f3c4 in g_object_new (object_type=7111056, first_property_name=first_property_name at entry=0x0) at ././gobject/gobject.c:1623
#14 0x00007ffff5570fa9 in webkit_settings_new() ()
    at ./Source/WebKit2/UIProcess/API/gtk/WebKitSettings.cpp:1294
#15 0x0000000000453798 in liferea_webkit_impl_init (self=0x6c8f90 [LifereaWebKitImpl]) at webkit.c:345
#16 0x00007ffff2c8b34b in g_type_create_instance (type=<optimized out>) at ././gobject/gtype.c:1866
#17 0x00007ffff2c6d1fb in g_object_new_internal (class=class at entry=0x6c3e70, params=params at entry=0x0, n_params=n_params at entry=0) at ././gobject/gobject.c:1783
#18 0x00007ffff2c6ec0d in g_object_newv (object_type=object_type at entry=7099264, n_parameters=n_parameters at entry=0, parameters=parameters at entry=0x0) at ././gobject/gobject.c:1930
#19 0x00007ffff2c6f3c4 in g_object_new (object_type=7099264, first_property_name=first_property_name at entry=0x0) at ././gobject/gobject.c:1623
#20 0x0000000000454131 in liferea_webkit_init () at webkit.c:107
#21 0x0000000000454131 in liferea_webkit_init () at webkit.c:421
#22 0x00000000004449d4 in liferea_htmlview_class_intern_init (klass=0x6c62c0) at liferea_htmlview.c:203
---Type <return> to continue, or q <return> to quit---
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