Red Hat Bugzilla – Bug 1276509
[abrt] yelp: gtk_application_impl_before_emit(): yelp killed by SIGSEGV
Last modified: 2017-06-19 10:09:33 EDT
Description of problem:
Well, the reproducer for this is a bit tricky. I'm testing a 23 Workstation image with the downgraded yelp 3.17.2 we're pulling into RC10. What I did was start opening installed apps, opening their help pages, clicking around a bit, quitting, and moving onto the next one.
This crash seems to happen semi-reliably when I get to Clocks. I first run the apps in the Dash, skipping Evo as it takes forever to set up and Firefox as it doesn't use yelp, so:
Software (except it has no Help screen)
then I move onto the overview:
when I got to Cheese, I did a bit more testing - I ran a search and clicked on a result, and also added a bookmark, and maximized the window. I did that again when I reproduced it. I'm not *sure* if it's really needed, to reproduce the bug.
The next app in the list is Clocks, and when I run it and open the Help, I hit this crash. It's happened three times so far. Subsequent attempts to launch the Clocks help work fine, the issue doesn't reliably recur.
Version-Release number of selected component:
cmdline: yelp help:cheese
runlevel: N 5
Thread no. 1 (6 frames)
#0 gtk_application_impl_before_emit at gtkapplicationimpl.c:83
#1 g_application_impl_method_call at gapplicationimpl-dbus.c:272
#2 call_in_idle_cb at gdbusconnection.c:4832
#6 g_main_context_iteration at gmain.c:3901
#7 g_application_run at gapplication.c:2331
Potential duplicate: bug 1238389
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Hmm, Googling shows several similar-looking reports:
Well I'm no C debugging champion, but it *looks* to me like possibly the issue there is that 'impl' is set to NULL when we hit gtk_application_impl_before_emit() ? In all the traces, it seems like we wind up with impl as '0x0' (which is NULL, right?) for the gtk_application_impl_before_emit() call. The thing that calls that is g_application_impl_method_call in glib, so I'm gonna tentatively assign this one to glib for now. Correct me if I'm completely wrong, of course :)
g_application_impl_method_call appears to take an argument 'user_data' which it then turns into a GApplicationImpl called 'impl', and then it passes the 'app' property of that 'impl' object to gtk_application_impl_before_emit() as its 'impl' argument, and that's about as far as I got.
If I'm approximately correct there, it would seem like this bug isn't really anything to do with yelp and so it's unlikely to be something that's regressed when we revert from yelp 3.18 to 3.17.2.
Although on the other hand, just possibly, https://git.gnome.org/browse/yelp/commit/?id=30b8883338e5f6df1898c72df8dea490d61f2a0f might help with this? I'm just spitballing, but I still haven't managed to reproduce it with yelp 3.18.1, so it's *possible* something between 3.17.2 and 3.18.1 did something about this...
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*** This bug has been marked as a duplicate of bug 1226229 ***