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IDProjectCategoryView StatusDate SubmittedLast Update
0007650ardourbugspublic2018-07-16 20:162018-07-31 18:12
Assigned To 
PlatformLinuxOSUbuntu StudioOS Version18.04
Product Version5.12 
Target VersionFixed in Version 
Summary0007650: Random Freezes
DescriptionI use Ardour to route all my audio for my streaming.
Sometimes Ardour will randomly freeze for a period.

It occurs even when I'm not recording anything
TagsNo tags attached.
Attached Filestxt file icon Backtrace.txt [^] (21,723 bytes) 2018-07-23 06:27 [Show Content]
txt file icon Backtrace 20180724.txt [^] (62,988 bytes) 2018-07-23 18:05 [Show Content]
txt file icon Backtrace 20180725.txt [^] (39,192 bytes) 2018-07-24 18:47 [Show Content]
txt file icon Backtrace Attempt 20180801 - 1.txt [^] (15,328 bytes) 2018-07-31 15:54 [Show Content]

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-  Notes
remekdc (reporter)
2018-07-23 06:27

I finally managed to create a backtrace of my session. The program would freeze for no apparent reason.
timbyr (developer)
2018-07-24 22:53

Thanks for trying to track your issue down, Unfortunately none of those files you attached are a backtrace.

To generate a backtrace in gdb you can use the control(Ctrl) + C keys together to generate a SIGINT signal. This should pause the execution of the program and you can then generate a backtrace for all threads with "thread apply all bt" or "t a a bt".

It will really only work if the freeze is long enough and or consistent enough to be able to interrupt execution at the right time.

It may also be nothing related to Ardour at all, it is hard to know without knowing a lot more information like does this happen with all Sessions? Are you using an official build of Ardour? etc
remekdc (reporter)
2018-07-30 21:54
edited on: 2018-07-30 21:55

I'll try doing a backtrace again tomorrow.

I now realise how much sparse my information is! I'm sorry about that.

- I use the version of Ardour that comes with Ubuntu Studio 18.04.
- It seems to happen randomly in almost every session.
- The length of the freezes aren't of the same length each time. Should I be timing the freezes?
- I use Ardour to connect my keyboard and microphone through to OBS (Open Broadcaster Software) through JACK.
- My USB soundcard is an Mbox 2.
- I'm not using Ardour to record when the freezes happen.
- I have 8GB ram
- Using a Laptop
- Processor is a mobile i7

Thank you for helping me. I really like Ardour! I'm happy to try other steps that would help. I'm not at all experienced with making bug reports so I'm happy to follow your lead

remekdc (reporter)
2018-07-31 16:00

"Backtrace Attempt 20180801 - 1"

1. I had left my computer on overnight with Ardour running (I just forgot to turn it off) and thought "lets try again".
2. I started playing my keyboard
3. Ardour froze
4. I went into terminal and did CTRL + C
5. I typed in "thread apply all bt"
6. Copied text into a document

I'll try again after a restart as well
timbyr (developer)
2018-07-31 18:12

Looking at the Backtrace Attempt 20180801 - 1.txt file that you have attached, it doesn't look like you were running/debugging Ardour with gdb, which you will need to do to generate a backtrace.

In saying that, if this is a version of Ardour that comes with Ubuntu Studio then it is unlikely you will be able to get a meaningful backtrace, as the executable/libraries will be optimized and stripped of symbols.

Can you please try to reproduce this issue with an official Ardour build of 5.12 from (It can be a Free/Demo version).

- Issue History
Date Modified Username Field Change
2018-07-16 20:16 remekdc New Issue
2018-07-23 06:27 remekdc Note Added: 0020361
2018-07-23 06:27 remekdc File Added: Backtrace.txt
2018-07-23 18:05 remekdc File Added: Backtrace 20180724.txt
2018-07-24 18:47 remekdc File Added: Backtrace 20180725.txt
2018-07-24 22:53 timbyr Note Added: 0020363
2018-07-24 22:54 timbyr Status new => feedback
2018-07-30 21:54 remekdc Note Added: 0020364
2018-07-30 21:54 remekdc Status feedback => new
2018-07-30 21:55 remekdc Note Edited: 0020364 View Revisions
2018-07-31 15:54 remekdc File Added: Backtrace Attempt 20180801 - 1.txt
2018-07-31 16:00 remekdc Note Added: 0020366
2018-07-31 18:12 timbyr Note Added: 0020367

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