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Bug#976095: linux-image-amd64: kernel crash refcount_t: underflow; use-after-free.

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  Bug#976095: linux-image-amd64: kernel crash refcount_t: underflow; use-after-free. Xavier Chantry <chantry.xavier@gmail.com> - 2020-11-29 18:40 +0100
    Bug#976095: linux-image-amd64: kernel crash refcount_t: underflow; use-after-free. Salvatore Bonaccorso <carnil@debian.org> - 2020-12-03 23:40 +0100
      Bug#976095: linux-image-amd64: kernel crash refcount_t: underflow; use-after-free. Xavier Chantry <chantry.xavier@gmail.com> - 2020-12-06 20:40 +0100
        Bug#976095: linux-image-amd64: kernel crash refcount_t: underflow; use-after-free. Salvatore Bonaccorso <carnil@debian.org> - 2020-12-09 15:10 +0100

#68737 — Bug#976095: linux-image-amd64: kernel crash refcount_t: underflow; use-after-free.

Package: linux-image-amd64
Version: 5.8.10-1~bpo10+1
Severity: important

Version 5.8.10-1~bpo10+1 contains a critical bug that completely freezes the
system with a very basic LibreOffice usage.
This is apparently fixed here :
https://www.mail-archive.com/nouveau@lists.freedesktop.org/msg36460.html

This patch appears in debian linux 5.9.9-1, so we are just waiting for a
backport in buster-backports to confirm the fix.

Thanks.



-- System Information:
Debian Release: 10.6
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.6.0-0.bpo.2-amd64 (SMP w/4 CPU cores)
Kernel taint flags: TAINT_WARN
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages linux-image-amd64 depends on:
ii  linux-image-5.8.0-0.bpo.2-amd64  5.8.10-1~bpo10+1

linux-image-amd64 recommends no packages.

linux-image-amd64 suggests no packages.

-- no debconf information

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#68753

Hi Xavier,

On Sun, Nov 29, 2020 at 06:32:36PM +0100, Xavier Chantry wrote:
> Package: linux-image-amd64
> Version: 5.8.10-1~bpo10+1
> Severity: important
> 
> Version 5.8.10-1~bpo10+1 contains a critical bug that completely freezes the
> system with a very basic LibreOffice usage.
> This is apparently fixed here :
> https://www.mail-archive.com/nouveau@lists.freedesktop.org/msg36460.html
> 
> This patch appears in debian linux 5.9.9-1, so we are just waiting for a
> backport in buster-backports to confirm the fix.

Can you fetch the package from testing to confirm it fixes the issue
you are seeing so we can adjust the bug metadata accordingly?

Regards,
Salvatore

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#68780

[Multipart message — attachments visible in raw view] — view raw

I just tested 5.9.6-1~bpo10+1 from buster-backports and it seems to work,
thanks !

On Thu, Dec 3, 2020 at 11:33 PM Salvatore Bonaccorso <carnil@debian.org>
wrote:

> Hi Xavier,
>
> On Sun, Nov 29, 2020 at 06:32:36PM +0100, Xavier Chantry wrote:
> > Package: linux-image-amd64
> > Version: 5.8.10-1~bpo10+1
> > Severity: important
> >
> > Version 5.8.10-1~bpo10+1 contains a critical bug that completely freezes
> the
> > system with a very basic LibreOffice usage.
> > This is apparently fixed here :
> > https://www.mail-archive.com/nouveau@lists.freedesktop.org/msg36460.html
> >
> > This patch appears in debian linux 5.9.9-1, so we are just waiting for a
> > backport in buster-backports to confirm the fix.
>
> Can you fetch the package from testing to confirm it fixes the issue
> you are seeing so we can adjust the bug metadata accordingly?
>
> Regards,
> Salvatore
>

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#68791

Hi Xavier,

On Sun, Dec 06, 2020 at 08:35:57PM +0100, Xavier Chantry wrote:
> I just tested 5.9.6-1~bpo10+1 from buster-backports and it seems to work,
> thanks !

But then your and the referenced issue should be two different issues?
The nouveau issue you referenced was only fixed in 5.9.9-1, did you
had any further information relating it to it?

Happy to close it with 5.9.6-1~bpo10+1 but noticed that discrepancy.

Regards,
Salvatore

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