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| [02:01:46] | jya_: | I just pushed the merge to the ffmpeg/1.1 resync |
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| [19:04:35] | peper03: | Is there a known problem using -v refcount on master? I'm getting a segmentation fault every time I exit playback but only if 'refcount' is specified. Backtrace here: http://pastebin.com/fsf5hiCa |
| [19:06:24] | peper03: | My first guess is some kind of timing issue as it only happens if -v refcount is specified, and although it nearly always dies at the same line, sometimes it happens a couple of lines later (mythuitype.cpp:336 instead of mythuitype.cpp:333) |
| [19:09:00] | danielk221: | peper03: no known problem, there is probably a reference after delete bug at work. If you look at the refcount header it should tell you how to increase debugging to find the bug. |
| [19:12:52] | peper03: | danielk221: I defined 'EXTRA_DEBUG' but didn't notice anything out of the ordinary. I guess I could try 'LEAK_DEBUG' but I'd guess that since it's segfaulting, that'll happen before it outputs that someone tried call DecRef too many times. I'll pick away at it, though. |
| [19:13:42] | danielk221: | peper03: LEAK_DEBUG should work. IIRC it completely disables freeing memory :) |
| [19:13:55] | danielk221: | peper03: You do need to distclean... |
| [19:14:09] | peper03: | danielk221: Ah, yes, that would make sense. I'll give it a go. |
| [19:14:57] | peper03: | danielk221: Not directly related, but I notice that the logging when 'EXTRA_DEBUG' is *not* defined references arguments %2 and %3 but there are only two arguments. Seems to work but I don't know whether that's luck or by design? |
| [19:15:12] | danielk221: | by design :) |
| [19:15:41] | peper03: | Oookaayyy.... |
| [19:17:39] | danielk221: | QString replaces the lowest numbered %# with the current .arg(), QString("%0:%1:%2").arg(1).arg(2).arg(3) generates "1:%1%2" and "1:2:%2" as intermediates before returning "1:2:3" from the last .arg() |
| [19:18:58] | peper03: | Ok, I guess that makes sense too :) |
| [19:23:01] | peper03: | Hmm. Defining 'NO_DELETE_DEBUG' didn't help either. It crashes before anything can be output :( |
| [19:25:26] | danielk221: | :( |
| [19:25:46] | danielk221: | did you uninstall the plugins? |
| [19:26:36] | peper03: | I don't think I have any installed. I ran make distclean, config... make and then make install. I only see 'TV', 'Video' and 'Setup' in the main menu. |
| [19:28:35] | danielk221: | peper03: You may want to clear out /usr/local/plugins basically you are changing the ABI, but not updating the ABI version.. |
| [19:33:11] | peper03: | danielk221: I don't have a /usr/local/plugins. I've configured the Myth build to install to a directory under my home directory. I set LD_LIBRARY_PATH to point to 'lib' under that installation directory. There's no plugins directory there. |
| [19:35:10] | peper03: | Looking at the backtrace again, frame 9 is the destructor for MythUIType. Frame 10 is the destructor for QObject so presumably MythUIType has been destroyed by that point but the 'this' pointer at frame 1 is the same as at frame 9. |
| [19:37:10] | peper03: | MythUIType::SetRedraw calls it's parent, but the parent has already been destroyed. |
| [19:37:17] | peper03: | s/it's/its/ |
| [19:37:56] | peper03: | Why on earth this is triggered by logging refcounts, I don't know. |
| [19:45:58] | peper03: | Adding a call to DeleteAllChildren(); to MythUIType::~MythUIType seems to fix it. Does that seem reasonable? |
| [19:49:36] | danielk221: | I don't know off hand, maybe stuartm knowns? |
| [19:50:20] | peper03: | stuartm: ^^^ |
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| [19:51:52] | peper03: | danielk221: BTW, I mentioned the other day about a lack of copy-constructor in ReferenceCounter. Does it make sense to add one to ensure that the reference count of the copy is set to 1? |
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| [19:52:52] | stuartm: | since MythUIType inherits from QObject it's children are deleted automatically, I really don't know whether explicitly deleting will cause a problem, but it's not actually necessary |
| [19:53:10] | danielk221: | peper03: well I don't think it was designed for copies, so probably a copy constructor that calls assert(false |
| [19:53:31] | peper03: | stuartm: But it's a problem if one of the children calls the parent, which has already been destroyed. |
| [19:53:41] | natanojl: | peper03: I fixed that crash recently |
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| [19:54:37] | peper03: | nataonjl: Oh, I know I'm not on head but I didn't remember seeing a commit. I must have missed it. |
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| [19:55:01] | natanojl: | https://github.com/MythTV/mythtv/commit/c0419 . . . bea8b30180f2 |
| [19:55:36] | stuartm: | right, but deleting the parent should delete the child (and it probably does when control returns to the event loop), an alternate fix would be to check whether parent is NULL before calling SetRedraw()? (I'm not looking at the code right now) |
| [19:55:48] | peper03: | natanojl: Ah, yes. Sorry for the noise! |
| [19:56:08] | natanojl: | peper03: np |
| [19:56:32] | stuartm: | or natanojl has already fixed it :P |
| [19:57:24] | natanojl: | It never crashed here but valgrind complained about it when I checked |
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| [19:58:12] | peper03: | I don't know why it only crashes when refcount logging is turned on but it does it every time here. |
| [19:58:26] | stuartm: | I know the reliance on the QObject behaviour is confusing, we must get a new ticket every 6 months from someone who has 'discovered a memory leak' :) |
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| [20:00:08] | stuartm: | even I questioned it when I took over work on mythui from Isaac, who took over from Thor |
| [20:03:30] | peper03: | danielk221: The reference counter class (unless I've missed something in my haste) only wraps around the counter so I would think that implementing a copy-constructor to set the counter of the new copy to 1 wouldn't cause any problems. I don't think anything tries to use a copy-constructor at the moment, but I may well use one for the DVD context class. |
| [20:03:56] | peper03: | It would be something that could be added as necessary rather than in anticipation. |
| [20:09:50] | natanojl: | Did anyone read this? http://www.theatlantic.com/technology/archive . . . tely/274383/ |
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