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Mixxx 1.6.0beta2 Segfaults while "Scratching" #4921

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mixxxbot opened this issue Aug 22, 2022 · 7 comments
Closed

Mixxx 1.6.0beta2 Segfaults while "Scratching" #4921

mixxxbot opened this issue Aug 22, 2022 · 7 comments
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Reported by: alex-malexmedia
Date: 2008-02-17T15:48:35Z
Status: Fix Released
Importance: Medium
Launchpad Issue: lp192663
Attachments: [Backtrace of a locked-up mixxx.](https://bugs.launchpad.net/bugs/192663/+attachment/209334/+files/Backtrace of a locked-up mixxx.), [Lots and Lots of Valgrind](https://bugs.launchpad.net/bugs/192663/+attachment/209338/+files/Lots and Lots of Valgrind), [Patch for issue.](https://bugs.launchpad.net/bugs/192663/+attachment/209437/+files/Patch for issue.), [A fix for the fix.](https://bugs.launchpad.net/bugs/192663/+attachment/209498/+files/A fix for the fix.)

Using Mixxx on Linux (fc7) with no DRI.

When "scratching" through any track using my new MIDI jog wheel, Mixxx will occasionally segfault. The backtraces always seem to lead to the same place. Here is a sample:

[alex@rockit2 ~]$ gdb mixxx
GNU gdb Red Hat Linux (6.6-16.fc7rh)
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-redhat-linux-gnu"...
Using host libthread_db library "/lib/libthread_db.so.1".
(gdb) run
Starting program: /usr/local/bin/mixxx 
[Thread debugging using libthread_db enabled]
[New Thread -1209030960 (LWP 4806)]
Debug: Starting up...
[New Thread -1215960176 (LWP 4809)]
[New Thread -1231176816 (LWP 4810)]
[New Thread -1250686064 (LWP 4811)]
Debug: SoundManager::SoundManager() 
Debug: SampleRate 44100 
Debug: Latency 36 
Debug: SoundManager::queryDevices() 
Debug: SoundManager::clearDeviceList() 
Debug: SoundManager::closeDevices() 
[New Thread -1264178288 (LWP 4812)]
[Detaching after fork from child process 4813. (Try `set detach-on-fork off'.)]
Debug: type signal
Debug: type marks
Debug: type signal
Debug: type marks
[New Thread -1274668144 (LWP 4814)]
[New Thread -1285158000 (LWP 4815)]
Debug: Loading playlists and library tracks from XML... 
Debug: Track::readXML "/home/alex/.mixxxtrack.xml" 
Debug: Break
Debug: Constructed LibraryScanner!!! 
Debug: No playlists, returning 
Debug: FIXME: Need to tell the m_pPlaylistListModel to refresh in src/track.cpp on line: 1120 
Debug: Trying to add 119 songs to the library playlist 
Debug: Adjusting column widths: tracktable width = 582  1% of that is: 5.82  FIXME: this should be done when initalizing the skin. 
Debug: Shrinking Title/Comment for small screen...  
Debug: selectedAPI is:  "ALSA" 
Debug: SoundManager::getDeviceList 
Debug: SoundManager::getDeviceList 
Debug: SoundManager::getDeviceList 
[New Thread -1298138224 (LWP 4816)]
Debug: PowerMate: write(): Bad file descriptor
Debug: PowerMate: write(): Bad file descriptor
Debug: m_pHercules init: 0xb5e6b880
[New Thread -1308628080 (LWP 4817)]
Debug: Midi OK (Workaround not required)
Debug: setupMappings( "/usr/local/share/mixxx/midi/Numark Total Control.midi.xml" ) 
[Thread -1308628080 (LWP 4817) exited]
Debug: Found option "invert" 
Debug: Option: 1
Debug: Found option "diff" 
Debug: Option: 5
Debug: Setting "jog" sensitivity to 10 
Debug: Found option "diff" 
Debug: Option: 5
Debug: Setting "jog" sensitivity to 10 
Debug: Found option "diff" 
Debug: Option: 5
Debug: loadSettings: 1 0 "SlowFade" 
Debug: slotApply crossfader: 1 "SlowFade" 
Debug: BpmSchemes::readXML "/home/alex/.mixxxbpmscheme.xml" 
Debug: SoundManager::setupDevices() 
Debug: Xwax Vinyl control starting with a sample rate of: 44100 
Debug: Building timecode lookup tables... 
Allocating 2097152 slots (8192Kb) for 20 bit timecode (Serato 2nd Ed., side A)
[New Thread -1308628080 (LWP 4818)]
Debug: Created new VinylControlXwax! 
Debug: Xwax Vinyl control starting with a sample rate of: 44100 
Debug: Building timecode lookup tables... 
[New Thread -1327510640 (LWP 4819)]
Debug: Created new VinylControlXwax! 
Debug: SoundDevicePortAudio::open() "1, HDA ATI SB: ALC883 Analog (hw:0,0)" 
Debug: m_dSampleRate 44100 
Debug: iLatencyMSec: 36 
Debug: output channels: 2 | input channels: 0 
Debug: iLatencySamples: 3176 
Debug: iLatencyMSec: 36 
Debug: Opening stream with id 1 
Debug: Opened PortAudio stream successfully... starting 
[New Thread -1338000496 (LWP 4820)]
Debug: PortAudio: Started stream successfully 
Debug: iNumDevicesOpenedForOutput: 1 
Debug: iNumDevicesOpenedForInput: 0 
Debug: file length 33437952
Debug: WaveSummary generation successful for "Glare-Alive_Again_PM.mp3" 
Debug: ramp in
Debug: BPM detection successful for "Glare-Alive_Again_PM.mp3" 
Debug: ramp in
Debug: ramp in
Debug: ramp in
Debug: ramp in
Debug: ramp in
Debug: ramp in
Debug: ramp in
Debug: ramp in
Debug: ramp in

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1338000496 (LWP 4820)]
0x0815f25c in RateTransposerFloat::transposeStereo (this=0xa2f0620, dest=0xae759940, src=0xa035b20, numSamples=100)
    at lib/soundtouch/RateTransposer.cpp:590
590             dest[2 * i] = (SAMPLETYPE)((1.0f - fSlopeCount) * sPrevSampleL + fSlopeCount * src[0]);
(gdb) thread apply all bt

Thread 12 (Thread -1338000496 (LWP 4820)):
#⁠0 0x0815f25c in RateTransposerFloat::transposeStereo (this=0xa2f0620, dest=0xae759940, src=0xa035b20, numSamples=100)
at lib/soundtouch/RateTransposer.cpp:590
#⁠1 0x081602d2 in soundtouch::RateTransposer::transpose (this=0xa2f0620, dest=0xae759940, src=0xa035b20, numSamples=100)
at lib/soundtouch/RateTransposer.cpp:318
#⁠2 0x0815f730 in soundtouch::RateTransposer::upsample (this=0xa2f0620, src=0xa035b20, numSamples=100)
at lib/soundtouch/RateTransposer.cpp:231
#⁠3 0x0815f8d9 in soundtouch::RateTransposer::processSamples (this=0xa2f0620, src=0xa035b20, numSamples=100)
at lib/soundtouch/RateTransposer.cpp:303
#⁠4 0x0815f915 in soundtouch::RateTransposer::putSamples (this=0xa2f0620, samples=0xa035b20, numSamples=100)
at lib/soundtouch/RateTransposer.cpp:212
#⁠5 0x0815cc52 in soundtouch::SoundTouch::putSamples (this=0xa1089c0, samples=0xa035b20, numSamples=100)
at lib/soundtouch/SoundTouch.cpp:317
#⁠6 0x0815b8c8 in EngineBufferScaleST::scale (this=0xa035860, playpos=604618.23999999987, buf_size=3176, pBase=0xb78fc008,
iBaseLength=819200) at src/enginebufferscalest.cpp:174
#⁠7 0x080b5142 in EngineBuffer::process (this=0xa04f670, pOut=0xb5918008, iBufferSize=3176) at src/enginebuffer.cpp:1120
#⁠8 0x080e0ed0 in EngineMaster::process (this=0xa081d50, pOut=0x0, iBufferSize=3176) at src/enginemaster.cpp:181
#⁠9 0x0814b078 in SoundManager::requestBuffer (this=0xa0aca70, srcs=@0xb03fb210, iFramesPerBuffer=1588)
at src/soundmanager.cpp:440
#⁠10 0x0815054c in SoundDevicePortAudio::callbackProcess (this=0xa0adef0, framesPerBuffer=1588, output=0xa331c00, in=0x0,
devIndex=1) at src/sounddeviceportaudio.cpp:305
#⁠11 0x081506c2 in paV19Callback (inputBuffer=0x0, outputBuffer=0xa331c00, framesPerBuffer=1588, timeInfo=0xb03fb378,
statusFlags=0, _callbackStuff=0xa0adf30) at src/sounddeviceportaudio.cpp:362
#⁠12 0x0032ae8c in AdaptingOutputOnlyProcess (bp=0xa350c94, streamCallbackResult=0xb03fb39c, hostOutputChannels=0xa046df0,
framesToProcess=400) at src/common/pa_process.c:1058
#⁠13 0x0032bb59 in PaUtil_EndBufferProcessing (bp=0xa350c94, streamCallbackResult=0xb03fb39c) at src/common/pa_process.c:1581
#⁠14 0x0033359d in CallbackThreadFunc (userData=0xa350c48) at src/hostapi/alsa/pa_linux_alsa.c:3303
#⁠15 0x0079e44b in start_thread () from /lib/libpthread.so.0
#⁠16 0x006cc80e in clone () from /lib/libc.so.6

Thread 11 (Thread -1327510640 (LWP 4819)):
#0  0x00110402 in __kernel_vsyscall ()
mixxxdj/mixxx#4910  0x007a2206 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
mixxxdj/mixxx#4911  0x001e41f8 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
mixxxdj/mixxx#4912  0x08172258 in VinylControlXwax::run (this=0xa341098) at src/vinylcontrolxwax.cpp:128
mixxxdj/mixxx#4913  0x001e3917 in ?? () from /usr/lib/libQtCore.so.4
mixxxdj/mixxx#4914  0x0079e44b in start_thread () from /lib/libpthread.so.0
---Type <return> to continue, or q <return> to quit---
mixxxdj/mixxx#4915  0x006cc80e in clone () from /lib/libc.so.6

Thread 10 (Thread -1308628080 (LWP 4818)):
#0  0x00110402 in __kernel_vsyscall ()
mixxxdj/mixxx#4910  0x007a2206 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
mixxxdj/mixxx#4911  0x001e41f8 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
mixxxdj/mixxx#4912  0x08172258 in VinylControlXwax::run (this=0xa2b53d8) at src/vinylcontrolxwax.cpp:128
mixxxdj/mixxx#4913  0x001e3917 in ?? () from /usr/lib/libQtCore.so.4
mixxxdj/mixxx#4914  0x0079e44b in start_thread () from /lib/libpthread.so.0
mixxxdj/mixxx#4915  0x006cc80e in clone () from /lib/libc.so.6

Thread 8 (Thread -1298138224 (LWP 4816)):
#0  0x00110402 in __kernel_vsyscall ()
mixxxdj/mixxx#4910  0x006c2a43 in poll () from /lib/libc.so.6
mixxxdj/mixxx#4911  0x08159422 in MidiObjectALSASeq::run (this=0xa104b18) at src/midiobjectalsaseq.cpp:250
mixxxdj/mixxx#4912  0x001e3917 in ?? () from /usr/lib/libQtCore.so.4
mixxxdj/mixxx#4913  0x0079e44b in start_thread () from /lib/libpthread.so.0
mixxxdj/mixxx#4914  0x006cc80e in clone () from /lib/libc.so.6

Thread 7 (Thread -1285158000 (LWP 4815)):
#0  0x00110402 in __kernel_vsyscall ()
mixxxdj/mixxx#4910  0x007a2206 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
mixxxdj/mixxx#4911  0x001e41f8 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
mixxxdj/mixxx#4912  0x08124085 in BpmDetector::run (this=0xa0ffe60) at src/bpmdetector.cpp:129
mixxxdj/mixxx#4913  0x001e3917 in ?? () from /usr/lib/libQtCore.so.4
mixxxdj/mixxx#4914  0x0079e44b in start_thread () from /lib/libpthread.so.0
mixxxdj/mixxx#4915  0x006cc80e in clone () from /lib/libc.so.6

Thread 6 (Thread -1274668144 (LWP 4814)):
#0  0x00110402 in __kernel_vsyscall ()
mixxxdj/mixxx#4910  0x007a2206 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
mixxxdj/mixxx#4911  0x001e41f8 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
mixxxdj/mixxx#4912  0x08123074 in WaveSummary::run (this=0xa0fd5e0) at src/wavesummary.cpp:81
mixxxdj/mixxx#4913  0x001e3917 in ?? () from /usr/lib/libQtCore.so.4
mixxxdj/mixxx#4914  0x0079e44b in start_thread () from /lib/libpthread.so.0
mixxxdj/mixxx#4915  0x006cc80e in clone () from /lib/libc.so.6

Thread 5 (Thread -1264178288 (LWP 4812)):
---Type <return> to continue, or q <return> to quit---
#0  0x00110402 in __kernel_vsyscall ()
mixxxdj/mixxx#4910  0x006c5561 in select () from /lib/libc.so.6
mixxxdj/mixxx#4911  0x0026f69f in ?? () from /usr/lib/libQtCore.so.4
mixxxdj/mixxx#4912  0x001e3917 in ?? () from /usr/lib/libQtCore.so.4
mixxxdj/mixxx#4913  0x0079e44b in start_thread () from /lib/libpthread.so.0
mixxxdj/mixxx#4914  0x006cc80e in clone () from /lib/libc.so.6

Thread 4 (Thread -1250686064 (LWP 4811)):
#0  0x00110402 in __kernel_vsyscall ()
mixxxdj/mixxx#4910  0x007a2206 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
mixxxdj/mixxx#4911  0x001e41f8 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
mixxxdj/mixxx#4912  0x081527fc in EngineSideChain::run (this=0xa08aeb8) at src/enginesidechain.cpp:145
mixxxdj/mixxx#4913  0x001e3917 in ?? () from /usr/lib/libQtCore.so.4
mixxxdj/mixxx#4914  0x0079e44b in start_thread () from /lib/libpthread.so.0
mixxxdj/mixxx#4915  0x006cc80e in clone () from /lib/libc.so.6

Thread 3 (Thread -1231176816 (LWP 4810)):
#0  0x00110402 in __kernel_vsyscall ()
mixxxdj/mixxx#4910  0x007a2206 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
mixxxdj/mixxx#4911  0x001e41f8 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
mixxxdj/mixxx#4912  0x080f6211 in Reader::run (this=0xa046218) at src/reader.cpp:256
mixxxdj/mixxx#4913  0x001e3917 in ?? () from /usr/lib/libQtCore.so.4
mixxxdj/mixxx#4914  0x0079e44b in start_thread () from /lib/libpthread.so.0
mixxxdj/mixxx#4915  0x006cc80e in clone () from /lib/libc.so.6

Thread 2 (Thread -1215960176 (LWP 4809)):
#0  0x00110402 in __kernel_vsyscall ()
mixxxdj/mixxx#4910  0x007a2206 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
mixxxdj/mixxx#4911  0x001e41f8 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
mixxxdj/mixxx#4912  0x080f6211 in Reader::run (this=0xa032550) at src/reader.cpp:256
mixxxdj/mixxx#4913  0x001e3917 in ?? () from /usr/lib/libQtCore.so.4
mixxxdj/mixxx#4914  0x0079e44b in start_thread () from /lib/libpthread.so.0
mixxxdj/mixxx#4915  0x006cc80e in clone () from /lib/libc.so.6

Thread 1 (Thread -1209030960 (LWP 4806)):
#0  0x00110402 in __kernel_vsyscall ()
mixxxdj/mixxx#4910  0x006c2a43 in poll () from /lib/libc.so.6
mixxxdj/mixxx#4911  0x00372803 in ?? () from /lib/libglib-2.0.so.0
---Type <return> to continue, or q <return> to quit---
mixxxdj/mixxx#4912  0x00372d35 in g_main_context_iteration () from /lib/libglib-2.0.so.0
mixxxdj/mixxx#4913  0x002a8ca8 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
mixxxdj/mixxx#4914  0x03065c95 in ?? () from /usr/lib/libQtGui.so.4
mixxxdj/mixxx#4915  0x00286cc1 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
mixxxdj/mixxx#4916  0x00286dcc in QEventLoop::exec () from /usr/lib/libQtCore.so.4
mixxxdj/mixxx#4917  0x0028917a in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
mixxxdj/mixxx#4918  0x02febd77 in QApplication::exec () from /usr/lib/libQtGui.so.4
mixxxdj/mixxx#4919 0x080c3b1e in main (argc=1, argv=0xbfbad444) at src/main.cpp:219
0x0815f25c      590             dest[2 * i] = (SAMPLETYPE)((1.0f - fSlopeCount) * sPrevSampleL + fSlopeCount * src[0]);
(gdb)
@mixxxbot mixxxbot added the bug label Aug 22, 2022
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Commented by: asantoni
Date: 2008-02-17T16:50:15Z

Just out of curiosity, what is the jog wheel control set to in your MIDI mapping? (This probably has nothing to do with the problem...)

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Commented by: alex-malexmedia
Date: 2008-02-17T18:23:40Z

My jog wheels are set like so:

<control>
	<group>[Channel1]</group>
	<key>jog</key>
	<miditype>Ctrl</miditype>
	<midino>25</midino>
	<sensitivity>10</sensitivity>
	<options><diff/></options>
</control>

However, my codebase has a few lines changed in the configobject.cpp which make diff a little saner for my setup.

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Commented by: alex-malexmedia
Date: 2008-02-17T18:24:50Z
Attachments: [Backtrace of a locked-up mixxx.](https://bugs.launchpad.net/mixxx/+bug/192663/+attachment/209334/+files/Backtrace of a locked-up mixxx.)

As you requested, I tried to cause the same problem in pitch-independent stretch mode. Mixxx locked up instead of segfaulting, but here is the backtrace.

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Commented by: alex-malexmedia
Date: 2008-02-17T18:44:16Z
Attachments: [Lots and Lots of Valgrind](https://bugs.launchpad.net/mixxx/+bug/192663/+attachment/209338/+files/Lots and Lots of Valgrind)

Caused the same segfault while running under valgrind.

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Commented by: alex-malexmedia
Date: 2008-02-17T22:34:43Z
Attachments: [Patch for issue.](https://bugs.launchpad.net/mixxx/+bug/192663/+attachment/209437/+files/Patch for issue.)

Fixed!

When the seek speed is too low, we essentially ask SoundTouch to expand our 100-sample buffer into literally gigabytes of RAM. (Which causes SoundTouch to overflow an int and segfault.)

This patch adds MIN_SEEK_SPEED, which successfully prevents such nonsense from ever happening.

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Commented by: alex-malexmedia
Date: 2008-02-18T01:30:30Z
Attachments: [A fix for the fix.](https://bugs.launchpad.net/mixxx/+bug/192663/+attachment/209498/+files/A fix for the fix.)

Discovered another case where soundtouch->setRate() could be called with a super-small number.

sheepish Guess I need to do my homework better...

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Issue closed with status Fix Released.

@mixxxbot mixxxbot mentioned this issue Aug 24, 2022
Closed
@mixxxbot mixxxbot transferred this issue from another repository Aug 24, 2022
@mixxxbot mixxxbot mentioned this issue Aug 24, 2022
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