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Ticket #7617: Segmentation fault with FD_SET

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mythtv at cvs

Nov 19, 2009, 8:37 AM

Post #1 of 30 (1342 views)
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Ticket #7617: Segmentation fault with FD_SET

#7617: Segmentation fault with FD_SET
---------------------------------------------+------------------------------
Reporter: banogabor@… | Owner: stuartm
Type: defect | Status: new
Priority: minor | Milestone: unknown
Component: MythTV - User Interface Library | Version: unknown
Severity: medium | Mlocked: 0
---------------------------------------------+------------------------------
I've found a annoying bug in Mythfrontend UI. My Myth system is run on
separated frontend and backend. The backend works correctly, records
series, etc... When I try to play back any program and would like to
navigate any series subtitles, at series group select I've allways got
segmentation fault and the machine exits from mythfrontend. If I stay on
default group or any built-in group, then I can browse recorded programs
one-by-one.

I'm localized the bug (with --verbose all), but I cannot to fix it. The
mythfrontend answers with segmentation fault, when the backend server
sends an 'Empty FD_SET'.

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/7617>
MythTV <http://www.mythtv.org/>
MythTV
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mythtv at cvs

Nov 19, 2009, 8:39 AM

Post #2 of 30 (1303 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

mythtv at cvs

Nov 19, 2009, 8:45 AM

Post #3 of 30 (1306 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

mythtv at cvs

Nov 19, 2009, 8:52 AM

Post #4 of 30 (1284 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

mythtv at cvs

Nov 19, 2009, 8:58 AM

Post #5 of 30 (1319 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

mythtv at cvs

Nov 19, 2009, 9:29 AM

Post #6 of 30 (1292 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

mythtv at cvs

Nov 19, 2009, 11:39 AM

Post #7 of 30 (1284 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

#7617: Segmentation fault with FD_SET
---------------------------------------------+------------------------------
Reporter: banogabor@… | Owner: stuartm
Type: defect | Status: infoneeded_new
Priority: minor | Milestone: unknown
Component: MythTV - User Interface Library | Version: unknown
Severity: medium | Mlocked: 0
---------------------------------------------+------------------------------

Comment(by mdean):

Any chance you could install the debug symbols, as described in the above-
linked wiki page, to make the backtrace a lot easier to read. And please
see http://www.mythtv.org/docs/mythtv-HOWTO-22.html#ss22.2 (linked from
the page above) for the actual gdb commands to run (including thread apply
all bt full ).

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/7617#comment:6>
MythTV <http://www.mythtv.org/>
MythTV
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mythtv at cvs

Nov 20, 2009, 10:43 AM

Post #8 of 30 (1245 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

mythtv at cvs

Nov 20, 2009, 10:59 AM

Post #9 of 30 (1237 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

mythtv at cvs

Nov 20, 2009, 11:00 AM

Post #10 of 30 (1242 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

#7617: Segmentation fault with FD_SET
-------------------------------------+--------------------------------------
Reporter: banogabor@… | Owner: ijr
Type: defect | Status: assigned
Priority: minor | Milestone: unknown
Component: MythTV - General | Version: unknown
Severity: medium | Mlocked: 0
-------------------------------------+--------------------------------------
Changes (by stuartm):

* owner: stuartm => ijr
* status: new => assigned
* component: MythTV - User Interface Library => MythTV - General

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/7617#comment:9>
MythTV <http://www.mythtv.org/>
MythTV
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mythtv at cvs

Nov 20, 2009, 2:08 PM

Post #11 of 30 (1246 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

#7617: Segmentation fault with FD_SET
-------------------------------------+--------------------------------------
Reporter: banogabor@… | Owner: ijr
Type: defect | Status: assigned
Priority: minor | Milestone: unknown
Component: MythTV - General | Version: unknown
Severity: medium | Mlocked: 0
-------------------------------------+--------------------------------------

Comment(by danielk):

(In [22872]) Refs #7617. This commit may or may not fix the segfault, but
it does fix actual bugs.

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/7617#comment:10>
MythTV <http://www.mythtv.org/>
MythTV
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mythtv at cvs

Apr 9, 2010, 2:22 PM

Post #12 of 30 (774 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

#7617: Segmentation fault with FD_SET
-------------------------------------+--------------------------------------
Reporter: banogabor@… | Owner: ijr
Type: defect | Status: infoneeded
Priority: minor | Milestone: unknown
Component: MythTV - General | Version: unknown
Severity: medium | Mlocked: 0
-------------------------------------+--------------------------------------
Changes (by robertm):

* status: assigned => infoneeded

Comment:

Is this bug still present in .23-fixes?

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/7617#comment:11>
MythTV <http://www.mythtv.org/>
MythTV
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mythtv at cvs

Apr 12, 2010, 3:21 AM

Post #13 of 30 (768 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

#7617: Segmentation fault with FD_SET
-------------------------------------+--------------------------------------
Reporter: banogabor@… | Owner: ijr
Type: defect | Status: infoneeded
Priority: minor | Milestone: unknown
Component: MythTV - General | Version: unknown
Severity: medium | Mlocked: 0
-------------------------------------+--------------------------------------

Comment(by anonymous):

I'm tried this new version of mythtv. It works better, so no longer stops
with segfault, but still doesn't handles accentuated letters correcly.
When a select a view filter, what contains any accentuated letters, I'm
got "there are no recording in your current view" message and doesn't
appear any recorded programs on the right side.

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/7617#comment:12>
MythTV <http://www.mythtv.org/>
MythTV
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mythtv at cvs

Apr 12, 2010, 3:46 AM

Post #14 of 30 (769 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

#7617: Segmentation fault with FD_SET
-------------------------------------+--------------------------------------
Reporter: banogabor@… | Owner: ijr
Type: defect | Status: infoneeded
Priority: minor | Milestone: unknown
Component: MythTV - General | Version: unknown
Severity: medium | Mlocked: 0
-------------------------------------+--------------------------------------

Comment(by anonymous):

I'm mistaken, still be segfault, but not in all of themes. No segfault on
Terra and Mythcenter theme. The former of my write refers these two themes

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/7617#comment:13>
MythTV <http://www.mythtv.org/>
MythTV
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mythtv at cvs

Apr 12, 2010, 10:42 PM

Post #15 of 30 (764 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

mythtv at cvs

Apr 12, 2010, 10:50 PM

Post #16 of 30 (759 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

#7617: Segmentation fault with FD_SET
-------------------------------------+--------------------------------------
Reporter: banogabor@… | Owner:
Type: defect | Status: new
Priority: minor | Milestone: unknown
Component: MythTV - General | Version: unknown
Severity: medium | Mlocked: 0
-------------------------------------+--------------------------------------
Changes (by mdean):

* owner: ijr =>
* status: assigned => new

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/7617#comment:15>
MythTV <http://www.mythtv.org/>
MythTV
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mythtv at cvs

Apr 12, 2010, 10:53 PM

Post #17 of 30 (757 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

#7617: Segmentation fault with FD_SET
-------------------------------------+--------------------------------------
Reporter: banogabor@… | Owner:
Type: defect | Status: infoneeded_new
Priority: minor | Milestone: unknown
Component: MythTV - General | Version: unknown
Severity: medium | Mlocked: 0
-------------------------------------+--------------------------------------
Changes (by mdean):

* status: new => infoneeded_new

Comment:

banogabor, can you test with the attached patch on either 0.23-fixes or
trunk and let us know if it helps? Thanks.

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/7617#comment:16>
MythTV <http://www.mythtv.org/>
MythTV
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mythtv at cvs

Apr 13, 2010, 2:45 PM

Post #18 of 30 (736 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

#7617: Segmentation fault with FD_SET
-------------------------------------+--------------------------------------
Reporter: banogabor@… | Owner:
Type: defect | Status: infoneeded_new
Priority: minor | Milestone: unknown
Component: MythTV - General | Version: unknown
Severity: medium | Mlocked: 0
-------------------------------------+--------------------------------------

Comment(by anonymous):

Sorry. I'm tried it with latest trunk version, but same all everything.
Unfortunatelly didn't help this patch.

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/7617#comment:17>
MythTV <http://www.mythtv.org/>
MythTV
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mythtv at cvs

Apr 13, 2010, 4:22 PM

Post #19 of 30 (733 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

#7617: Segmentation fault with FD_SET
-------------------------------------+--------------------------------------
Reporter: banogabor@… | Owner:
Type: defect | Status: infoneeded_new
Priority: minor | Milestone: unknown
Component: MythTV - General | Version: unknown
Severity: medium | Mlocked: 0
-------------------------------------+--------------------------------------

Comment(by mdean):

Can you get us a new backtrace with debug symbols for trunk (without the
patch), as the code where you got the segfault in the attached backtrace
doesn't exist anymore (got moved and changed a bit). Thanks.

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/7617#comment:18>
MythTV <http://www.mythtv.org/>
MythTV
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mythtv at cvs

Apr 14, 2010, 1:38 AM

Post #20 of 30 (726 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

#7617: Segmentation fault with FD_SET
-------------------------------------+--------------------------------------
Reporter: banogabor@… | Owner:
Type: defect | Status: infoneeded_new
Priority: minor | Milestone: unknown
Component: MythTV - General | Version: unknown
Severity: medium | Mlocked: 0
-------------------------------------+--------------------------------------

Comment(by anonymous):

OK,I'll do it. But I'm detected another interest thing: I was an feel:
maybe when I've got the 'no recordings' message, the frontend doesn't send
any queries to the database. And yes! I run frontend with '-v database'
option, and watched it what does. It does really not send any queries to
database. Whether why?

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/7617#comment:19>
MythTV <http://www.mythtv.org/>
MythTV
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mythtv at cvs

Apr 16, 2010, 2:22 AM

Post #21 of 30 (684 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

#7617: Segmentation fault with FD_SET
-------------------------------------+--------------------------------------
Reporter: banogabor@… | Owner:
Type: defect | Status: infoneeded_new
Priority: minor | Milestone: unknown
Component: MythTV - General | Version: unknown
Severity: medium | Mlocked: 0
-------------------------------------+--------------------------------------

Comment(by anonymous):

I think, may I found the source of error: The 2297 row in playbackbox.cpp
file in programs folder. I think need to put dual colon beetween double
quotes instead of single.
I'm tried it and works: no segfault already, but the show filtering still
not works well.
Please fix it, if had verification.

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/7617#comment:20>
MythTV <http://www.mythtv.org/>
MythTV
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mythtv at cvs

Apr 16, 2010, 2:36 AM

Post #22 of 30 (685 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

#7617: Segmentation fault with FD_SET
-------------------------------------+--------------------------------------
Reporter: banogabor@… | Owner:
Type: defect | Status: new
Priority: minor | Milestone: 0.23
Component: MythTV - General | Version: Trunk Head
Severity: medium | Mlocked: 0
-------------------------------------+--------------------------------------
Changes (by stuartm):

* status: infoneeded_new => new
* version: unknown => Trunk Head
* milestone: unknown => 0.23

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/7617#comment:21>
MythTV <http://www.mythtv.org/>
MythTV
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mythtv at cvs

Apr 16, 2010, 2:36 AM

Post #23 of 30 (688 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

#7617: Segmentation fault with FD_SET
-------------------------------------+--------------------------------------
Reporter: banogabor@… | Owner: cpinkham
Type: defect | Status: assigned
Priority: minor | Milestone: 0.23
Component: MythTV - General | Version: Trunk Head
Severity: medium | Mlocked: 0
-------------------------------------+--------------------------------------
Changes (by stuartm):

* owner: => cpinkham
* status: new => assigned

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/7617#comment:22>
MythTV <http://www.mythtv.org/>
MythTV
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mythtv at cvs

Apr 16, 2010, 9:30 AM

Post #24 of 30 (679 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

#7617: Segmentation fault with FD_SET
-------------------------------------+--------------------------------------
Reporter: banogabor@… | Owner: cpinkham
Type: defect | Status: assigned
Priority: minor | Milestone: 0.23
Component: MythTV - General | Version: Trunk Head
Severity: medium | Mlocked: 0
-------------------------------------+--------------------------------------

Comment(by cpinkham):

Can you try changing that line to the following instead of changing the
double quotes to single quotes?

Change this:

QString grpHost = sgroup + ":" + host;

To this:

QString grpHost = QString("%1:%2").arg(sgroup).arg(host);

See if that still segfaults.

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/7617#comment:23>
MythTV <http://www.mythtv.org/>
MythTV
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mythtv at cvs

Apr 16, 2010, 11:29 PM

Post #25 of 30 (655 views)
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Re: Ticket #7617: Segmentation fault with FD_SET [In reply to]

#7617: Segmentation fault with FD_SET
-------------------------------------+--------------------------------------
Reporter: banogabor@… | Owner: cpinkham
Type: defect | Status: assigned
Priority: minor | Milestone: 0.23
Component: MythTV - General | Version: Trunk Head
Severity: medium | Mlocked: 0
-------------------------------------+--------------------------------------

Comment(by anonymous):

Sorry, this change isn't fix this problem.

--
Ticket URL: <http://svn.mythtv.org/trac/ticket/7617#comment:24>
MythTV <http://www.mythtv.org/>
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