Bug#1107868: mumble: segfault on first start

[Chris Knadle]

severity 1107868 important
forwarded 1107868 
https://github.com/mumble-voip/mumble/pull/6852#issuecomment-3070250752
thanks

I'm lowering the severity of this bug from "serious" to "important".
The justification is that this bug causes a Segfault in specific cases 
where PipeWire libraries are installed without configuration installed, 
rather than making package unusable to everyone.

https://www.debian.org/Bugs/Developer#severities

Upstream is working on the bug but the specific problem is not clear, 
and I don't think this bug is worth removal of the package for everyone 
in Debian on July 26. We're close to the next release and I would rather 
not risk Mumble not shipping at all over this. Mumble can be updated in 
a Point Release for this issue.

    -- Chris

Chris Knadle
Chris.Knadle at coredump.us

On 7/14/25 12:54, Chris Knadle wrote:
> I've forwarded the additional bug information upstream to see if 
> additional fixes can be done for this bug.
>
> Thanks
>
> Chris Knadle
> Chris.Knadle at coredump.us
>
> On 7/11/25 12:08, Thorsten Glaser wrote:
>> Package: mumble
>> Version: 1.5.735-5
>> Followup-For: Bug #1107868
>> X-Debbugs-Cc: tg at mirbsd.de
>>
>> A backtrace and hopefully more useful information follows.
>>
>> I’ve got no idea how to backtrace through the clone(2) syscall,
>> so no idea what to try to cast the “arg” argument to, but there
>> is something suspect:
>>
>> The current (crashing) thread is named AudioOutput, while the
>> main() thread seems to be currently executing the destructor of
>> a class called AudioOutput.
>>
>> Might be that if it tries multiple audio outputs it creates and
>> destroys multiple AudioOutput objects, and that these objects
>> spawn threads, but that they reuse the single “AudioOutput” thread
>> or some of its variables?
>>
>>
>> (gdb) r
>> Starting program: /usr/bin/mumble
>> Downloading 542.84 K separate debug info for /lib64/ld-linux-x86-64.so.2
>> Downloading 47.69 K separate debug info for system-supplied DSO at 
>> 0x7ffff7fc5000
>> Downloading 1.62 M separate debug info for 
>> /lib/x86_64-linux-gnu/libPocoXML.so.100
>> Downloading 1.31 M separate debug info for 
>> /lib/x86_64-linux-gnu/libPocoZip.so.100
>> Downloading 5.78 M separate debug info for 
>> /lib/x86_64-linux-gnu/libPocoFoundation.so.100
>> Downloading 593.04 K separate debug info for 
>> /lib/x86_64-linux-gnu/libsndfile.so.1
>> Downloading 12.19 M separate debug info for 
>> /lib/x86_64-linux-gnu/libprotobuf.so.32
>> Downloading 5.21 M separate debug info for 
>> /lib/x86_64-linux-gnu/libcrypto.so.3
>> Downloading 1.41 M separate debug info for 
>> /lib/x86_64-linux-gnu/libssl.so.3
>> Downloading 14.34 M separate debug info for 
>> /lib/x86_64-linux-gnu/libQt5Network.so.5
>> Downloading 295.37 K separate debug info for 
>> /home/tg/.cache/debuginfod_client/3c8f80ff1a4dfed6d343b44117a09bbf712aac2b/debuginfo
>> Downloading 988.20 K separate debug info for 
>> /lib/x86_64-linux-gnu/libQt5Xml.so.5
>> Downloading 1.83 M separate debug info for 
>> /lib/x86_64-linux-gnu/libQt5Sql.so.5
>> Downloading 2.67 M separate debug info for 
>> /lib/x86_64-linux-gnu/libQt5Svg.so.5
>> Downloading 122.07 K separate debug info for 
>> /home/tg/.cache/debuginfod_client/62639e72eab35785019a4b6ae2879528fd5822de/debuginfo
>> Downloading 36.69 M separate debug info for 
>> /lib/x86_64-linux-gnu/libQt5Widgets.so.5
>> Downloading 40.33 M separate debug info for 
>> /lib/x86_64-linux-gnu/libQt5Gui.so.5
>> Downloading 5.94 M separate debug info for 
>> /home/tg/.cache/debuginfod_client/e2f93f74d4662093f1c8592146f29cc221dea23c/debuginfo
> [trimming backtrace output to not duplicate it in the report]
>