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Bug#893393: linux-image-amd64: Kernel panic on active outgoing traffic through Huawei E173 modem in NDIS (CDC) mode

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Phil <debian@anm.c0mm.it> writes:

> Hi, I hope you're all doing well.
>
> Shall we/I maybe reopen a new issue?

I believe so.  I am almost sure we fixed the original memset BUG in
cdc_ncm_fill_tx_frame. Or at least one of them...

So you are probably seeing another issue if you still have problems with
that fix in place.  Although the issues may or may not be related.  But
still, aother bug report would make it easier to track given that we
alread have one fix for 893393.

> I'm still affected by this and I'd could use some advice how to debug
> the issue a little bit better, especially since the kexec kernel
> crashdumps appear not to be helpful. Can I maybe compile the module with
> special debug flags and load it via. dkms or something?

Crash reports of some sort are best.  But any info is useful.  Like what
device is this really and what mode is in currently in?  What driver
does it use?  Most Huawei firmwares will support many different modes
using different USB drivers. But laptop internal modems are most likely
not tested with anything but the Windows MBIM class driver, since that
is the certification requirement and only target platform.

You can enable the little debugging that's already in the drivers by
doing something like

 echo 'module cdc_ncm +fp' >/sys/kernel/debug/dynamic_debug/control
 echo 'module cdc_mbim +fp' >/sys/kernel/debug/dynamic_debug/control
 echo 'module huawei_cdc_ncm +fp' >/sys/kernel/debug/dynamic_debug/control

See https://www.kernel.org/doc/html/v4.11/admin-guide/dynamic-debug-howto.html

Not sure it will be useful to debug a freeze though.

> I don't see any actual changes in [cdc_ncm.c][cdc_ncm], besides the one
> change in `cdc_ncm_unbind`.

Not sure I understood this...  Are you referring to the fix for bug
893393?  That's part of the v4.9.111 stable release:

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/net/usb/cdc_ncm.c?h=linux-4.9.y&id=35fd10aeb2248cc7f8d3d48ccc2eff1cf19918f4

> Also I'm confused why this is happening now again, I managed to do an
> rsync upload with ~10GB over night back then - and my system didn't
> crash - but right now even if I'm just trying to upload a picture to
> twitter via. Firefox my laptop freezes.

Freezing without any Oops or similar? 



Bjørn

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Bug#893393: linux-image-amd64: Kernel panic on active outgoing traffic through Huawei E173 modem in NDIS (CDC) mode Горбешко Богдан  <bodqhrohro@gmail.com> - 2018-03-18 15:50 +0100
  Bug#893393: linux-image-amd64: Kernel panic on active outgoing traffic through Huawei E173 modem in NDIS (CDC) mode Bjørn Mork <bjorn@mork.no> - 2018-03-19 01:40 +0100
  Bug#893393: linux-image-amd64: Kernel panic on active outgoing traffic through Huawei E173 modem in NDIS (CDC) mode Горбешко Богдан  <bodqhrohro@gmail.com> - 2018-03-19 15:10 +0100
  Bug#893393: linux-image-amd64: Kernel panic on active outgoing traffic through Huawei E173 modem in NDIS (CDC) mode Phil <t@woerm.at> - 2018-06-27 21:50 +0200
  Bug#893393: linux-image-amd64: Kernel panic on active outgoing traffic through Huawei E173 modem in NDIS (CDC) mode Bjørn Mork <bmork@telenor.net> - 2018-06-29 10:40 +0200
    Bug#893393: linux-image-amd64: Kernel panic on active outgoing traffic through Huawei E173 modem in NDIS (CDC) mode Горбешко Богдан  <bodqhrohro@gmail.com> - 2018-08-02 23:30 +0200
      Bug#893393: linux-image-amd64: Kernel panic on active outgoing traffic through Huawei E173 modem in NDIS (CDC) mode Горбешко Богдан  <bodqhrohro@gmail.com> - 2018-08-04 14:10 +0200
        Bug#893393: linux-image-amd64: Kernel panic on active outgoing traffic through Huawei E173 modem in NDIS (CDC) mode debian@anm.c0mm.it - 2018-08-07 00:10 +0200
  Bug#893393: linux-image-amd64: Kernel panic on active outgoing traffic through Huawei E173 modem in NDIS (CDC) mode Phil <debian@anm.c0mm.it> - 2018-07-06 21:10 +0200
    Bug#893393: linux-image-amd64: Kernel panic on active outgoing traffic through Huawei E173 modem in NDIS (CDC) mode Phil <debian@anm.c0mm.it> - 2018-08-31 00:40 +0200
  Bug#893393: linux-image-amd64: Kernel panic on active outgoing traffic through Huawei E173 modem in NDIS (CDC) mode Bjørn Mork <bjorn@mork.no> - 2018-08-31 11:30 +0200

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