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IDProjectCategoryView StatusLast Update
0006898ardourbugspublic2022-01-28 17:08
ReporteraeLiXihr Assigned To 
PrioritynormalSeverityblockReproducibilityhave not tried
Status confirmedResolutionopen 
PlatformKX studioOSGNU/LinuxOS VersionKXStudio 14.04.2
Product Version5.12 
Summary0006898: ardour freezes during clean-up
DescriptionKXStudio 14.04.2 LTS - Release amd64

Dear all,
i have had a problem with Clean-up for a while:
If i go to Session>Clean-up>Clean-up Unused Sources...>Clean-up nothing happens. The popup below does not appear
Ardour freezes and if i try to close Ardour it takes a while and an "Ardour is not responding"screen pops up.

I ran in gdb and that is here:
If you tell me how i would attach my session file as well.

I found out: if i try to uncombine the first compounds from Droomvlucht-solo(@ 07:13:21:08, tracks: "gitaar-room" and "gitaar" ) they are deleted.

(i have the original session file(without -3001) too but it cannot be attached?, pressing browse nothing happens)
nb: i hope i filled in everything correctly: any questions, just ask please :)
TagsNo tags attached.



2016-06-18 08:14


rommelen-3001.ardour (3,988,339 bytes)


2016-06-18 09:47


rommelen.ardour (3,988,339 bytes)


2017-12-22 12:37

reporter   ~0020109

the issue persists in Ardour 5.12


2018-01-11 13:07

developer   ~0020114

I can reproduce the freezing issue with cleanup sources and the Session you have attached with 5.12

Based on the gdb backtrace you have referenced and the comment in SessionPlaylist::source_use_count () there may be circular references between compound regions and this is causing an infinite loop/freeze.

Thanks for taking the time to report this and attaching a Session that can be used to reproduce the issue.


2018-01-13 13:00



2018-01-13 13:00

developer   ~0020115

I've attached a trace that can be loaded in chrome://tracing that shows the function calls occurring with this session when calling Session::cleanup(At least the first few seconds before I have to interrupt the process so as to not write too large a trace file).

It indicates that the amount of deep nesting (8-9 levels at least) of compound regions in combination with the number of sources in this session may be causing the freezing as in the trace it is still processing the first source out of 0000109:0000400 after 4 seconds.

I'm unsure that the freeze is actually infinite at this point and how there can be circular references.

It does definitely indicate that another method of processing the sources to determine which ones can be "cleaned up" is perhaps needed.

It seems like a method in which each snapshot is loaded and then determining unused sources based on the reference count of the source would much quicker, or possibly just something like storing the Source reference count in a property of the Source on save and using that instead.

Hans Flikkema

2020-07-29 08:05

reporter   ~0024848

Hi, I want to add that freezing when trying to clean up still happens using Ardour 6.2. It always happens after a longer cut and paste session on for instance 5 recorded Vocals tracks or setting a bass drum track on time.
After that I consolidate those tracks and then I want to clean up and then is when it all goes wrong. When it freezes while cleaning up (selecting clean up unused sources). The project still can be re-opened again but only increases in size. So after this happening the session gets useless. Exporting track is the only options and you loose all mixing, bussing, and track plugin settings.

I did some research and found out it has nothing to do with which audio files are in the audio folder or even which tracks are in the project. Even after deleting all tracks in that pariticular project, is still freezes after clicking remove all unused sources. So it must be some corruption in the "projectname.ardour" file.

I still have a spare copy of one of these crashed projects. If someone wants to examine it i can load it up.

Hans Flikkema

2020-07-29 08:14

reporter   ~0024849

Crashing when try to clean up unused sources
Platform W10 Home 2004
Ardour 6.2

Hans Flikkema

2020-07-29 08:16

reporter   ~0024850

Refering to 0024848
Crashing when try to clean up unused sources
Platform W10 Home 2004
Ardour 6.2
Projectfile without audio tracks

Hans Flikkema

2020-07-29 08:31

reporter   ~0024851

Refering to 0024848 (excusing for repeating this but the file won't load up)
Is there a work around to recover from this project. Deleting all PEAK files didn't solve the problem either?
Is the a way to prevent this happening. would it help if I clean up more frequently?
Winter_ARD_REC_007.rar (140,412 bytes)


2022-01-28 17:08

reporter   ~0026316

Crashing when try to clean up unused sources
Platform Windows 10
Ardour 6.9

Also, clean up of regions or writing to the session file may be involved? With simple projects, after I clean up regions, the number of <Region name=...> XML nodes matches the number of regions displayed in the Editor List. However, in one recent project that has a number of edits in it, the Editor List shows 24 regions after cleanup, but the session file has 2100+ <Region name=...> XML nodes. Maybe that is relevant.

Issue History

Date Modified Username Field Change
2016-06-18 08:14 aeLiXihr New Issue
2016-06-18 08:14 aeLiXihr File Added: rommelen-3001.ardour
2016-06-18 09:47 aeLiXihr File Added: rommelen.ardour
2017-12-22 12:37 aeLiXihr Note Added: 0020109
2018-01-11 13:07 timbyr Note Added: 0020114
2018-01-11 13:08 timbyr Status new => confirmed
2018-01-11 13:08 timbyr Product Version => 5.12
2018-01-13 13:00 timbyr File Added: Ardour-5.12.bug6898.trace.tar.xz
2018-01-13 13:00 timbyr Note Added: 0020115
2020-07-29 08:05 Hans Flikkema Note Added: 0024848
2020-07-29 08:14 Hans Flikkema Note Added: 0024849
2020-07-29 08:16 Hans Flikkema Note Added: 0024850
2020-07-29 08:31 Hans Flikkema File Added: Winter_ARD_REC_007.rar
2020-07-29 08:31 Hans Flikkema Note Added: 0024851
2022-01-28 17:08 chance_favre Note Added: 0026316