GNU bug report logs - #64605
HandBrake 1.5.1 hangs on startup due libQt5Qml

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#64605: closed (HandBrake 1.5.1 hangs on startup due libQt5Qml)
Date: Sat, 26 Aug 2023 02:28:02 +0000

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Your message dated Fri, 25 Aug 2023 22:26:52 -0400
with message-id <87cyzaa68j.fsf <at> gmail.com>
and subject line Re: bug#64605: HandBrake 1.5.1 hangs on startup due libQt5Qml
has caused the debbugs.gnu.org bug report #64605,
regarding HandBrake 1.5.1 hangs on startup due libQt5Qml
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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64605: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=64605
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From: Distopico Vegan <distopico <at> riseup.net>
To: bug-guix <at> gnu.org
Subject: HandBrake 1.5.1 hangs on startup due libQt5Qml
Date: Thu, 13 Jul 2023 13:56:36 -0500

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HandBrake 1.5.1 hangs on startup and `dmesg` show the following error


```
 QQmlThread[....]: segfault at 0 ip 000.... sp 0000... error 4 in libQt5Qml.so.5.15.8
```
After some research I found a similar issues on NixOS:

- https://github.com/NixOS/nixpkgs/issues/32577
- https://github.com/NixOS/nixpkgs/issues/177720

and a solution: https://github.com/NixOS/nixpkgs/pull/197010

Looks like the issue is related with QML disk cache, and after test
ruining *handbrake* with `QML_DISABLE_DISK_CACHE=1` works fine

```
QML_DISABLE_DISK_CACHE=1 ghb
```

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From: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
To: Distopico <distopico <at> riseup.net>
Cc: 64605-done <at> debbugs.gnu.org
Subject: Re: bug#64605: HandBrake 1.5.1 hangs on startup due libQt5Qml
Date: Fri, 25 Aug 2023 22:26:52 -0400

Hello,

Maxim Cournoyer <maxim.cournoyer <at> gmail.com> writes:

> Hi,
>
> Distopico <distopico <at> riseup.net> writes:
>
>> On 2023-07-20, Maxim Cournoyer <maxim.cournoyer <at> gmail.com> wrote:
>>
>>> Hello,
>>>
>>> Distopico <distopico <at> riseup.net> writes:
>>>
>>>> On 2023-07-20, Maxim Cournoyer <maxim.cournoyer <at> gmail.com> wrote:
>>>>
>>>>> This looks like an upstream Qt problem.  Have you searched if an issue
>>>>> was known about it?  Their tracker is at https://bugreports.qt.io/.
>>>>
>>>> Checking there looks like is already reported a similar issue
>>>> https://bugreports.qt.io/browse/QTBUG-58508, I think that happens in
>>>> Guix/Nix becase QT is trying to write inside the profile path 
>>>
>>> It looks like we should apply this patch to completely disable QML disk
>>> cache in Qt: https://github.com/NixOS/nixpkgs/pull/197010.
>>
>> yes, I was thinking on that, maybe inside [profile]/etc/profile
>
> No, the patch is more definitive than that, it disables the QML disk
> caching from qtdeclarative directly.

Installed with commit 1717c8a233b7fda3a10aabc061168c71317f883e.

Let me know if any caching problems persist.

-- 
Thanks,
Maxim

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