Bug#1120718: linux-image-6.12.43+deb13-amd64: hung tasks on mutex acquisition during rtnetlink ops

[Salvatore Bonaccorso <carnil@debian.org>]

Hi Nick,

On Tue, Nov 25, 2025 at 10:05:16AM -0800, Nick Owens wrote:
> On Sat, 15 Nov 2025 16:16:04 -0800 Nick Owens <mischief@offblast.org> wrote:
> > hi,
> >
> >
> > > Is this regressing from an earlier kernel? If yes can you isolate the
> > > range more closely?
> > >
> >
> > based on "journalctl -t kernel | grep 'Linux version'" the prior version
> > with no hang seems to be 6.9.12-amd64. i will try it after the newer 6.12.
> 
> do you have any advice on how to run the older debian kernel on debian
> trixie?

You can fetch other released images (please only use them then only
for testing, as they obviously contain issues fixed later) from the
snapshot.debian.org service:

https://snapshot.debian.org/

here you can fetch e.g. the 6.9.12 one and re-test it with and them
move stepwise towards the range where things changes. This might help
isolate the problem, but the next step would likely be as well then to
biseect the changes in this closer range. As I understand the
reproduction is as well not immediately.

> >
> >
> > >
> > > Additionally 6.12.43-1 is not the current trixie kernel, do the hangs
> > > are reproducible with 6.12.48-1 (and the today to be released via the
> > > 13.2 point release) 6.12.57-1?
> > >
> >
> > i've booted to linux-image-6.12.57+deb13-amd64 and i will see what
> happens.
> 
> this kernel has also eventually hung after about 10 days.

Ok bad. I have updated the metadata.

What you additionally as wel can try is to test the kernels currently
in unstable and see if the problem is triggered there as well,
currently it would be 6.17.8-1 in unstable.

Regards,
Salvatore