MythLogBot@irc.freenode.net :: #mythtv

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Saturday, February 13th, 2016, 00:04 UTC
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[09:47:05] warpme: morning all!
[09:47:40] warpme: can somebody help me with analyzinfg this BE deadlock: http://pastebin.com/VLc1dFFi
[09:50:20] warpme: Last month or so I started to have BE deadlocks when using LiveTV. My initial thought was that it is related to https://code.mythtv.org/trac/ticket/12636, but today I got deadlock durring just changing channel. Very frustrating as all familly laughtly complain about "freezed TV".
[09:52:38] warpme: Interesting that last year all was working really stable. BE dedlocks started last month or two. Damn!!!!
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[10:26:58] lautriv_: warpme, did you upgrade something (OS) ?
[10:51:09] stuartm: very, very brief look, but appears to be the old scheduler deadlock which I thought was fixed a year ago
[10:51:29] stuartm: warpme: is this 0.27 or 0.28?
[10:57:52] lautriv_: my 0.28 are used to be rock-solid except there is a storm truncating dish's signal.
[10:58:23] lautriv_: but the FE's never work with one of opengl/vaapi/vdpau :(
[11:00:19] warpme: stuartm: I'm on current master
[11:01:10] warpme: lautriv_: no any changes in OS except periodic myth updates
[11:01:53] warpme: for me interesting is line 447 in BT: it = <error reading variable it (Cannot access memory at address 0x0)>
[11:05:15] lautriv_: warpme, since the other complaints were about glibc and qtcore, i assumed also a problem which may be related to the general functionality ( accessing RAM and such ) something nice from dmesg ?
[11:06:50] warpme: stuartm: I also think it might be related to scheduller as deadlocks are in LiveTV and 3 of them I had when scheduler was in run (I think). But why scheduller deadlock causes totally dead BE (no any protocol replays for FE comm)?
[11:08:11] warpme: lautriv_: absolutelly nothing interesting in journal (I'm on systemd)
[11:09:00] lautriv_: urgh, that is your main issue :P
[11:15:06] lautriv_: can anyone tell me how to get audio on RADEON via HDMI ? i have [AMD/ATI] RS880 HDMI Audio [Radeon HD 4200 Series] using snd_hda_intel but nothing in /dev
[11:16:23] lautriv_: and of corse snd_hda_codec_hdmi loaded
[11:20:28] warpme: stuartm: In my BE I have patch for delaying concurrent recordings start by 500msec. It is needed for reliability as without it starting concurrently more than 6–8 recordings causes 0B rec. Patch simply delays few sec just after https://github.com/MythTV/mythtv/blob/master/ . . . ec.cpp#L1058
[11:21:23] warpme: Is it possible that if LiveTV zaps within this delay window then BE deadlocks?
[11:27:52] warpme: another hypothesiss is 916e43bb5 It touches BE comm with FE (so potentially can make BE dead for any comm with FE) and was commited quite recently. Just hypothessis....
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[12:13:19] stuartm: warpme: when protocol thread tries to fetch scheduler information it requests a lock which is denied since it's deadlocked, hence that thread locks up too
[12:13:58] stuartm: recording threads also request scheduler information, so those lock up
[12:14:15] stuartm: pretty much everything grinds to a halt
[12:15:37] stuartm: I debugged this in detail a long time back, and gigem pushed some fixes, so either these fixes missed a case or they didn't address the problem directly
[12:16:08] stuartm: or since it's master, there has been a change or new feature added which re-introduced the problem
[12:16:46] stuartm: some scheduler methods and locks should come with huge health warnings
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[12:19:31] warpme: stuartm: should I attach today's trace to #12636 (I mean will it be helpfull?)
[12:19:31] ** MythLogBot http://code.mythtv.org/trac/ticket/12636 **
[12:25:56] warpme: stuartm: interesting is that whole 2015 was perfectly stable for me. Those deadlocks are mather of last month or two. Maybe this is pure coincidence but I doubt as regression is clearly seen. Whole year without single deadlock while last 2 weeks with 3 deadlocks. Usage behaviour is unchanged so I have hard time to believe that I had whole Year (or more) just luck and last weeks were unluck...
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[12:47:15] warpme: Is there an way to completelly delete given FE settings from DB (key for me is wipe-out playback profiles for given FE)?
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[14:41:43] stuartm: Microsoft ship VMs for testing various versions of IE and they zip them, which actually increases their size ...
[14:41:49] ** stuartm sighs **
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[14:43:32] stuartm: and of course it also doubles the amount of free disk space to download/install
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[16:23:50] lautriv_: anyone ever managed to get sound from Radeon/HDMI ?
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[19:41:26] stuarta: evening
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[22:17:16] bill6502: I have a fix for #12461, but have never added an integer to an iterator like lines 18 and 19 here: http://pastebin.com/amMBXSbg
[22:17:16] ** MythLogBot http://code.mythtv.org/trac/ticket/12461 **
[22:18:26] bill6502: the fix seems to work great, I'm just not sure about doing it, any practical wisdom about doing this?
[22:21:58] stuarta: don't you love c++, this is why it works -> http://doc.qt.io/qt-4.8/qlist-iterator.html#operator-2b
[22:23:52] stuarta: the only thing is, you should ensure that chanItEnd never exceeds end() of the iterator, apart from that looks good
[22:24:02] stuarta: here endeth my ramblings
[22:33:37] bill6502: thanks for the reference. range checks in place and tested with reasonable and ridiculous values
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