Calibre not shutting down completely when clicking on "X" - Page 2

Comfy.n · 03-19-2026, 02:52 AM

Quote:

Originally Posted by jos

I have the same problem. Every time I stop Calibre a main process is left still running.

Hi,

Are you by any chance running the plugin Goldendict Bridge?

jos · 03-19-2026, 02:55 AM

No, and I am testing with plugins disabled.

Comfy.n · 03-19-2026, 03:05 AM

Quote:

Originally Posted by jos

No, and I am testing with plugins disabled.

I've been having that issue more often, since calibre 9 too.

jos · 03-19-2026, 03:55 AM

I tested deleting the config directory and starting clean with an empty library but still the same problem. Saying that it works in the computer I'm using to write this..

Comfy.n · 03-19-2026, 04:37 AM

Mostly out of curiosity: what is your full Windows Build version (UBR)?

I sense Microsoft forcing users to migrate to Win11, this is not going to happen for me. Anyway, each time I update win10, I get a new unpleasant surprise. This might be entirely unrelated but there's my rant.

jos · 03-19-2026, 05:04 AM

19045.6691 and the the one that works runs 19045.7058.

Comfy.n · 03-19-2026, 05:15 AM

Mine is 19045.6456

kovidgoyal · 03-19-2026, 05:41 AM

According to that debug log all the actual calibre code has finished and exited, the hang is happening in python interpreter shutdown. Does it happen if you reboot in safe mode?

jos · 03-19-2026, 06:28 AM

Quote:

Originally Posted by kovidgoyal

According to that debug log all the actual calibre code has finished and exited, the hang is happening in python interpreter shutdown. Does it happen if you reboot in safe mode?

Yes, happens in safe mode.

kovidgoyal · 03-19-2026, 06:42 AM

Hmm only fix I can see for this is to unconditionally force kill the process then, but I am reluctant to do that as it could break something in one the calibre dependencies trying to do some cleanup at exit.

BetterRed · 03-19-2026, 06:59 AM

Quote:

Originally Posted by jos

Yes, happens in safe mode.

Just a hunch, if you autoadd… try turning it off.

BR

Jaws · 03-20-2026, 02:26 AM

Possible complication, based on chatter concerning the latest builds of Windows: Microsoft is trying harder and harder to expand use of the previously-run-programs cache, and that appears (according to the chatter) to be a Python-Windows interface issue. I've noted a similar issue with other Python-based programs since the January Windows Update.

I resolved it on my machines by emptying the previously-run-programs cache (I use BleachBit because it's easy for me to teach newbies to use, but there are many other options), which ended all of the processes and allowed a normal installation cycle. It seems to creep back in later, though -- especially upon updating plugins and doing a commanded-from-within-Calibre restart.

kovidgoyal · 03-20-2026, 04:34 AM

Well I implemented a force kill post a one second timeout: https://github.com/kovidgoyal/calibr...958856bbca08b9

That should workaround it.

Comfy.n · 03-20-2026, 11:05 PM

I believe the issue is now fixed @kovidgoyal

I've been monitoring the processes on some occasions when I was doing frequent restarts, and now I did tests with 9.5.101, and it never happened again to have stuck processes.

You may quickly check what was happening before the fix by doing a search for process_count. Days ago I've had occasionnaly up to 9 instances stuck. I've attached the monitoring log.

kovidgoyal · Yesterday, 02:03 AM

Yeah that fix is basically force killing the process once all calibre cleanup code has run.

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03-19-2026, 02:55 AM	#17
jos Junior Member Posts: 5 Karma: 10 Join Date: Mar 2026 Device: Kindle	No, and I am testing with plugins disabled.

03-19-2026, 03:55 AM	#19
jos Junior Member Posts: 5 Karma: 10 Join Date: Mar 2026 Device: Kindle	I tested deleting the config directory and starting clean with an empty library but still the same problem. Saying that it works in the computer I'm using to write this..

03-19-2026, 04:37 AM	#20
Comfy.n want to learn what I want Posts: 2,045 Karma: 7955899 Join Date: Sep 2020 Device: none	Mostly out of curiosity: what is your full Windows Build version (UBR)? I sense Microsoft forcing users to migrate to Win11, this is not going to happen for me. Anyway, each time I update win10, I get a new unpleasant surprise. This might be entirely unrelated but there's my rant.

03-19-2026, 05:04 AM	#21
jos Junior Member Posts: 5 Karma: 10 Join Date: Mar 2026 Device: Kindle	19045.6691 and the the one that works runs 19045.7058.

03-19-2026, 05:15 AM	#22
Comfy.n want to learn what I want Posts: 2,045 Karma: 7955899 Join Date: Sep 2020 Device: none	Mine is 19045.6456

03-19-2026, 05:41 AM	#23
kovidgoyal creator of calibre Posts: 46,114 Karma: 29626208 Join Date: Oct 2006 Location: Mumbai, India Device: Various	According to that debug log all the actual calibre code has finished and exited, the hang is happening in python interpreter shutdown. Does it happen if you reboot in safe mode?

03-19-2026, 06:42 AM	#25
kovidgoyal creator of calibre Posts: 46,114 Karma: 29626208 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Hmm only fix I can see for this is to unconditionally force kill the process then, but I am reluctant to do that as it could break something in one the calibre dependencies trying to do some cleanup at exit.

03-20-2026, 02:26 AM	#27
Jaws JCL Punch-Card Collector Posts: 97 Karma: 34468 Join Date: Jun 2014 Location: Antarctica Device: Aggressively Device Independent	Possible complication, based on chatter concerning the latest builds of Windows: Microsoft is trying harder and harder to expand use of the previously-run-programs cache, and that appears (according to the chatter) to be a Python-Windows interface issue. I've noted a similar issue with other Python-based programs since the January Windows Update. I resolved it on my machines by emptying the previously-run-programs cache (I use BleachBit because it's easy for me to teach newbies to use, but there are many other options), which ended all of the processes and allowed a normal installation cycle. It seems to creep back in later, though -- especially upon updating plugins and doing a commanded-from-within-Calibre restart.

03-20-2026, 04:34 AM	#28
kovidgoyal creator of calibre Posts: 46,114 Karma: 29626208 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Well I implemented a force kill post a one second timeout: https://github.com/kovidgoyal/calibr...958856bbca08b9 That should workaround it.

Yesterday, 02:03 AM	#30
kovidgoyal creator of calibre Posts: 46,114 Karma: 29626208 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Yeah that fix is basically force killing the process once all calibre cleanup code has run.