Bug 1381877 - [abrt] trojita: QXcbConnection::processXcbEvents(): trojita killed by SIGSEGV
Summary: [abrt] trojita: QXcbConnection::processXcbEvents(): trojita killed by SIGSEGV
Keywords:
Status: CLOSED CANTFIX
Alias: None
Product: Fedora
Classification: Fedora
Component: trojita
Version: 25
Hardware: x86_64
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Raphael Groner
QA Contact: Fedora Extras Quality Assurance
URL: https://retrace.fedoraproject.org/faf...
Whiteboard: abrt_hash:cf1a054f4c225c9d4e659fcdcb3...
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2016-10-05 09:05 UTC by Karel Volný
Modified: 2016-12-14 12:41 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2016-11-05 22:49:17 UTC
Type: ---


Attachments (Terms of Use)
File: backtrace (60.21 KB, text/plain)
2016-10-05 09:05 UTC, Karel Volný
no flags Details
File: cgroup (242 bytes, text/plain)
2016-10-05 09:05 UTC, Karel Volný
no flags Details
File: core_backtrace (7.44 KB, text/plain)
2016-10-05 09:05 UTC, Karel Volný
no flags Details
File: dso_list (20.11 KB, text/plain)
2016-10-05 09:05 UTC, Karel Volný
no flags Details
File: environ (1.44 KB, text/plain)
2016-10-05 09:05 UTC, Karel Volný
no flags Details
File: exploitable (95 bytes, text/plain)
2016-10-05 09:05 UTC, Karel Volný
no flags Details
File: limits (1.29 KB, text/plain)
2016-10-05 09:05 UTC, Karel Volný
no flags Details
File: maps (85.04 KB, text/plain)
2016-10-05 09:05 UTC, Karel Volný
no flags Details
File: mountinfo (3.08 KB, text/plain)
2016-10-05 09:05 UTC, Karel Volný
no flags Details
File: namespaces (102 bytes, text/plain)
2016-10-05 09:05 UTC, Karel Volný
no flags Details
File: open_fds (1.84 KB, text/plain)
2016-10-05 09:05 UTC, Karel Volný
no flags Details
File: proc_pid_status (1.12 KB, text/plain)
2016-10-05 09:05 UTC, Karel Volný
no flags Details
File: var_log_messages (875 bytes, text/plain)
2016-10-05 09:06 UTC, Karel Volný
no flags Details

Description Karel Volný 2016-10-05 09:05:38 UTC
Description of problem:
It crashed after X crash ... I guess the disconnect should be handled more gracefully.

Version-Release number of selected component:
trojita-0.7-3.fc25

Additional info:
reporter:       libreport-2.8.0
backtrace_rating: 4
cmdline:        /usr/bin/trojita
crash_function: QXcbConnection::processXcbEvents
executable:     /usr/bin/trojita
global_pid:     32010
kernel:         4.8.0-0.rc7.git0.1.fc25.x86_64
pkg_fingerprint: 4089 D8F2 FDB1 9C98
pkg_vendor:     Fedora Project
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #15 QXcbConnection::processXcbEvents at qxcbconnection.cpp:1699
 #16 QObject::event at kernel/qobject.cpp:1263
 #17 QApplicationPrivate::notify_helper at kernel/qapplication.cpp:3799
 #18 QApplication::notify at kernel/qapplication.cpp:3556
 #19 QCoreApplication::notifyInternal2 at kernel/qcoreapplication.cpp:988
 #20 QCoreApplication::sendEvent at kernel/qcoreapplication.h:231
 #21 QCoreApplicationPrivate::sendPostedEvents at kernel/qcoreapplication.cpp:1649
 #22 QCoreApplication::sendPostedEvents at kernel/qcoreapplication.cpp:1503
 #23 postEventSourceDispatch at kernel/qeventdispatcher_glib.cpp:276
 #27 g_main_context_iteration at gmain.c:3988

Comment 1 Karel Volný 2016-10-05 09:05:44 UTC
Created attachment 1207501 [details]
File: backtrace

Comment 2 Karel Volný 2016-10-05 09:05:45 UTC
Created attachment 1207502 [details]
File: cgroup

Comment 3 Karel Volný 2016-10-05 09:05:47 UTC
Created attachment 1207503 [details]
File: core_backtrace

Comment 4 Karel Volný 2016-10-05 09:05:49 UTC
Created attachment 1207504 [details]
File: dso_list

Comment 5 Karel Volný 2016-10-05 09:05:50 UTC
Created attachment 1207505 [details]
File: environ

Comment 6 Karel Volný 2016-10-05 09:05:51 UTC
Created attachment 1207506 [details]
File: exploitable

Comment 7 Karel Volný 2016-10-05 09:05:52 UTC
Created attachment 1207507 [details]
File: limits

Comment 8 Karel Volný 2016-10-05 09:05:54 UTC
Created attachment 1207508 [details]
File: maps

Comment 9 Karel Volný 2016-10-05 09:05:56 UTC
Created attachment 1207509 [details]
File: mountinfo

Comment 10 Karel Volný 2016-10-05 09:05:57 UTC
Created attachment 1207510 [details]
File: namespaces

Comment 11 Karel Volný 2016-10-05 09:05:58 UTC
Created attachment 1207511 [details]
File: open_fds

Comment 12 Karel Volný 2016-10-05 09:05:59 UTC
Created attachment 1207512 [details]
File: proc_pid_status

Comment 13 Karel Volný 2016-10-05 09:06:01 UTC
Created attachment 1207513 [details]
File: var_log_messages

Comment 14 Raphael Groner 2016-10-05 19:05:22 UTC
Well, X is the parent process for all forked application processes. I doubt we can do anything better for X crashers.

Comment 15 Karel Volný 2016-12-14 12:41:57 UTC
(In reply to Raphael Groner from comment #14)
> Well, X is the parent process for all forked application processes.

ahem, it doesn't seem to be this way on my system:

[kvolny@kvolny ~]$ ps -o ppid -C trojita
 PPID
    1

... and pid eins is systemd

using tree view like `ps xfa`, Xorg doesn't own anything; there is lxqt-session under sddm => sddm-helper and a few processes under that, but most X applications are detached (thus collected by pid 1)

> I doubt we can do anything better for X crashers.

I believe there should be a way, as after X crash, I don't get fifty reports for all the applications, I get only a few for some of them (that are buggy) ... I also often run kmail via xpra, which tends to lock up with 'wrong' versions of python, and cutting its branch by forcefully killing xvfb doesn't lead to kmail crash (nor crash of any dependent akonadi and various other processes)

I know it can be hard to debug as the Trojitá crash does not happen on each X crash, and I understand there is not enough manpower[*] to deal wih each and every corner case, but closing for capacity reasons is quite different from saying it can't be fixed because of the nature of things ...

[*] look at me, I'm dealing with my bugzilla queue after a few months as part of "Christmas cleanup", when I had to ask my manager for a pause from the usual daily work :-(


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