Re: [i3] i3 4.10.2 crash ---- isolated

  • From: "Sargrad, Dave" <Dave.Sargrad@xxxxxxxxxxxxxx>
  • To: "i3-discuss@xxxxxxxxxxxxx" <i3-discuss@xxxxxxxxxxxxx>
  • Date: Thu, 18 Jun 2015 13:35:37 +0000

One crash location found (con.c line 393), reference through null pointer:
[cid:image001.png@01D0A9AA.222B9380]


I3-with-shmlog is indeed the process to attach to. I started i3 clean, and then
as root I was able to attach to this process. For some reason, though i3 is
running as ubuntu, I was not able to attach as ubuntu. Once attached, I then
initiated the sequence of events that I expected to crash i3, the crash did
indeed occur (so this is quite repeatable).

I'll continue to see if I can isolate other crash points.

I'll post a bug on the bug tracker to ensure that this hits Michael's radar.





From: Sargrad, Dave
Sent: Thursday, June 18, 2015 9:16 AM
To: 'i3-discuss@xxxxxxxxxxxxx'
Subject: i3 4.10.2 crash

I3 4.10.2 has crashed on me. I've seen crashes before but have ignored them.
I'm interested in seeing if I can isolate the crash, particularly since I think
I know how to repeat the crash. Once isolated I can provide feedback to the dev
team.

I am currently presented with the "crash response window" (red border with
options to: attach gdb, save a backtracke, restart i3 in place, forget the
current layout and restart i3).

When I putty into the box and see what i3 processes are running (with an eye
towards attaching gdb), I see the following:

ubuntu@sensis-8930:~$ ps -aef | grep i3
ubuntu 2349 2075 0 Jun17 ? 00:00:01 i3-with-shmlog
ubuntu 2420 2349 0 Jun17 ? 00:00:00 /usr/bin/ssh-agent
/usr/bin/dbus -launch
--exit-with-session /usr/bin/im-launch i3-with-shmlog
ubuntu 2423 1 0 Jun17 ? 00:00:00 /usr/bin/dbus-launch
--exit-with -session
/usr/bin/im-launch i3-with-shmlog
ubuntu 2484 1 0 Jun17 ? 00:00:00 /bin/sh -c i3bar --bar_id=bar-0

--socket="/run/user/1000/i3/ipc-socket.2349"
ubuntu 2485 2484 0 Jun17 ? 00:00:29 i3bar --bar_id=bar-0
--socket=/r
un/user/1000/i3/ipc-socket.2349
ubuntu 2487 2485 0 Jun17 ? 00:00:00 /bin/sh -c i3status
ubuntu 2489 2487 0 Jun17 ? 00:00:24 i3status
ubuntu 2510 1 0 Jun17 ? 00:00:00 /bin/sh -c i3-sensible-terminal
ubuntu 6031 6005 0 12:12 pts/1 00:00:00 grep --color=auto i3


The area that I built i3 out of is: /home/ubuntu/work/i3/i3-4.10.2

This is where I should be able to find the source code and symbol files
required by gdb.

I've attached gdb to debuggable processes in the past (I don't need help with
that). I do need some guidance relative to the following questions:
1] If I save a backtrace, where will that get saved on the system
2] Of the processes listed above, which one do I attach to (I don't see i3..
perhaps i3-with-shmlog)?
3] What are the commands that I should enter into gdb so that it loads the
proper symbol files?

Thanks for any thoughts or guidance.

ubuntu@sensis-8930:~/work/i3$ ls
i3-4.10.2 i3-4.10.2.tar.bz2 i3status-2.9 i3status-2.9.tar.bz2


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