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This descibes possible causes for a rare crasher with effects. #4460

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daschuer wants to merge 2 commits intomixxxdj:effects_refactoringfrom
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This descibes possible causes for a rare crasher with effects. #4460
daschuer wants to merge 2 commits intomixxxdj:effects_refactoringfrom
daschuer:effects_refactoring_2

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@daschuer
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@daschuer daschuer commented Oct 19, 2021

I have experienced a crasher during testing of #2618

Probably related:
https://bugs.launchpad.net/mixxx/+bug/1775497

Here is the log, unfortunately it has not happen to me under GDB.

QML debugging is enabled. Only use this in a safe environment.
Loading resources from  "/home/daniel/workspace/2.3/res/"
Configuration file is at version "2.3.0-beta" instead of the current "2.4.0-alpha-pre"
BroadcastSettings - Found 1 profile(s)
Loading resources from  "/home/daniel/workspace/2.3/res/"
Found and will use default keyboard mapping "/home/daniel/workspace/2.3/res/keyboard/en_US.kbd.cfg"
Loading resources from  "/home/daniel/workspace/2.3/res/"
Loaded skin "Shade"
DBus screensaver  org.freedesktop.ScreenSaver  inhibited
ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib pcm_route.c:869:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:869:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:869:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:869:(find_matching_chmap) Found no matching channel map
Cannot connect to server socket err = Datei oder Verzeichnis nicht gefunden
Cannot connect to server request channel
jack server is not running or cannot be started
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
Cannot connect to server socket err = Datei oder Verzeichnis nicht gefunden
Cannot connect to server request channel
jack server is not running or cannot be started
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
ALSA lib pcm_oss.c:377:(_snd_pcm_oss_open) Unknown field port
ALSA lib pcm_oss.c:377:(_snd_pcm_oss_open) Unknown field port
ALSA lib pcm_usb_stream.c:486:(_snd_pcm_usb_stream_open) Invalid type for card
ALSA lib pcm_usb_stream.c:486:(_snd_pcm_usb_stream_open) Invalid type for card
Cannot connect to server socket err = Datei oder Verzeichnis nicht gefunden
Cannot connect to server request channel
jack server is not running or cannot be started
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
warning [Main] Library - Skipping access check for missing or invalid directory QFileInfo(/home/daniel/Öffen)
warning [BrowseThread] MetadataSourceTagLib - Cannot import track metadata from file "/home/daniel/Musik/Mixxx/Recordings/2021-03-16_15h27m08s.aac" with unknown or unsupported type 0
warning [BrowseThread] MetadataSourceTagLib - Cannot import track metadata from file "/home/daniel/Musik/Mixxx/Recordings/2021-03-16_15h26m32s.aac" with unknown or unsupported type 0
warning [BrowseThread] MetadataSourceTagLib - Cannot import track metadata from file "/home/daniel/Musik/Mixxx/Recordings/2021-03-16_15h26m02s.aac" with unknown or unsupported type 0
warning [Main] ControlDoublePrivate::getControl returning NULL for ( "[Master]" , "skin_settings" )
Abgebrochen (Speicherabzug geschrieben)

@ronso0 ronso0 marked this pull request as draft October 19, 2021 22:08
@ronso0 ronso0 marked this pull request as ready for review October 19, 2021 22:09
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Be-ing commented Oct 20, 2021

This code hasn't changed since you reviewed it years ago in #1254 besides adding documentation. This is unrelated to #2618 and I think it's inappropriate to open this PR as if these preexisting bugs are somehow a justification for not merging a 3.5 year old branch.

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ronso0 commented Oct 20, 2021 •
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I don't see a comment that this blocks #2618...
It's just ToDos been added.

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Swiftb0y commented Oct 21, 2021

It doesn't matter whether this PR is related to #2618 or not. It contains useful information for posterity and thats why we should merge it. But it should not block the merge of #2618!!

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Be-ing commented Oct 21, 2021

I don't know if this really contains useful information. We have a bug report and some guesses what causes the bug but it does not seem to be known for sure. I do not think it is appropriate to add potentially misleading comments to the code.

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ywwg commented Oct 21, 2021

Here is the log, unfortunately it has not happen to me under GDB.

can you get the crash to occur reliably without gdb? If so you should be able to enable corefile dumps and attach gdb to the corefile. (That's how I was able to find the controller shutdown bug)

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daschuer commented Oct 21, 2021

I have not yet found a pattern to reproduce that crash. It did not happen in my latest tests.
I think core dumps are enabled by default on Ubuntu. However I have no experience to use it for debugging. Probably a good Idea to learn it. Thank you for the hint.

@daschuer daschuer mentioned this pull request Oct 21, 2021
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Holzhaus commented Oct 21, 2021 •
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I have not yet found a pattern to reproduce that crash. It did not happen in my latest tests.
I think core dumps are enabled by default on Ubuntu. However I have no experience to use it for debugging. Probably a good Idea to learn it. Thank you for the hint.

If Ubuntu uses systemd's coredump mechanism, you can usecoredumpctl to open a gdb instance for the latest coredump:

$ coredump -1 gdb

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daschuer commented Oct 21, 2021

Ubuntu uses Apport

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Be-ing commented Oct 21, 2021

https://blogs.gnome.org/mcatanzaro/2021/09/18/creating-quality-backtraces-for-crash-reports/

@daschuer daschuer force-pushed the effects_refactoring branch from 9d3985f to 7845142 Compare October 21, 2021 23:45
@Be-ing Be-ing deleted the branch mixxxdj:effects_refactoring October 26, 2021 01:49
@Be-ing Be-ing closed this Oct 26, 2021
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daschuer commented Oct 26, 2021

Reopened at: #4487

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@daschuer @Be-ing @ronso0 @Swiftb0y @ywwg @Holzhaus