On Sat, 1 Mar 2025 15:10:17 +0100 Salvatore Bonaccorso
<car...@debian.org> wrote:
> Hi Paul,
>
> On Sat, Mar 01, 2025 at 08:21:58AM -0500, Paul DeKraker wrote:
> > Here is a log collected via netconsole.
> >
> > Thanks,
> > Paul
> >
> > On Thu, Feb 27, 2025 at 11:39 AM Salvatore Bonaccorso <car...@debian.org>
> > wrote:
> >
> > > Hi Paul,
> > >
> > > On Mon, Feb 24, 2025 at 09:12:43PM -0500, Paul DeKraker wrote:
> > > > I just tried 6.12.16 and as with 6.12.15 the system locks up / becomes
> > > > completely unresponsive and needs to be hard reset when attempting a
> > > large
> > > > transfer from a network share to the local computer, so this probably is
> > > a
> > > > separate issue. If there is something more I can do to capture this
> > > > behavior please let me know.
> > >
> > > Thanks for confirming. Yes now we have to get to fresh logs. As I
> > > understand you cannot access the system (not even remotely via SSH) to
> > > gather the kernel logs after the issue appears?
> > >
> > > In this case we might be successfull if you attach a netconsole and
> > > have another system available which can capture the logs.
> > > Documentation can be found here:
> > >
> > > https://www.kernel.org/doc/html/latest/networking/netconsole.html#netconsole
> > >
> > > Would you be able to try that and provide fresh logs for the recent
> > > 6.12.y kernels?
>
> Thanks a lot for the log, this was very helpful. At first glance it
> looks like this issue:
> https://lore.kernel.org/netfs/cakpou+_4muwygqtrtbxcmi+-k3pgvlysnpadkmhoyb7gz0i...@mail.gmail.com/
>
> There is a submitted patch but it does not look like it got applied
> already, checking.
>
> Might you be able to test the patch from
> https://lore.kernel.org/netfs/20250210191118.3444416-1-max.kellerm...@ionos.com/
> to see if it fixes the issue?
>
> You can follow the procedure in
> https://kernel-team.pages.debian.net/kernel-handbook/ch-common-tasks.html#id-1.6.6.4
> to do the "simple patching and building".
>
> Regards,
> Salvatore

(followed up from https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1099591)

I reproduced with the available versions in debian:

linux-image-6.12.12-amd64  6.12.12-1 -> segfault
linux-image-6.12.17-amd64  6.12.17-1 -> segfault
linux-image-6.13-amd64  6.13.5-1~exp1 -> 'kernel BUG at
fs/netfs/read_collect.c:316!'

Then I took the debian 6.12.17-1 kernel (latest LTS), added those 3 patches:

https://lore.kernel.org/netfs/20250211093432.3524035-1-max.kellerm...@ionos.com/
https://lore.kernel.org/netfs/20250210223144.3481766-1-max.kellerm...@ionos.com/
https://lore.kernel.org/netfs/20250210191118.3444416-1-max.kellerm...@ionos.com/

The resulting kernel apparently fixed the issue, I just testet in Qemu
so far (no signed kernel for secure boot).

Please provide a fixed version ASAP.

regards, Norbert

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