Kernel panic with user namespaces

Nikolay Borisov kernel at
Thu May 28 07:03:32 UTC 2015


I've run the attached test case on a clean 4.0 and 4.0 + the patch you
referenced but in neither cases could I crash the kernel. All that was
happening was for a new namespace to be created and bash executed in it
and after some seconds I get logged out of the machine. But then I can
log-in back and the kernel hasn't crashed.


On 05/27/2015 06:16 PM, Eric W. Biederman wrote:
> Josh Boyer <jwboyer at> writes:
>> On Tue, May 26, 2015 at 12:31 PM, Eric W. Biederman
>> <ebiederm at> wrote:
>>> Alexander Larsson <alexl at> writes:
>>>> On mån, 2015-05-18 at 16:39 +0200, Alexander Larsson wrote:
>>>> Didn't get any replies to the below kernel panic (testcase attached),
>>>> which seems rather important to fix. Reposting to a wider audience.
>>> Buggered backport greg already has the fix somewhere in his queue.
>> Is it fs_pin-allow-for-the-possibility-that-m_list-or-s_list-go-unused.patch
>> or mnt-fail-collect_mounts-when-applied-to-unmounted-mounts.patch ?
>> (Or both I guess.)  Those are the only 2 patches queued for 4.0 stable
>> right now.
> Both fix the buggered backport.
> fs_pin-allow-for-the-possibility-that-m_list-or-s_list-go-unused.patch
> fixes the crash.
> Eric
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