Having read the discussion carefully, I personally prefer to ignore
the fix as invalid, because mounting a filesystem image is a
privileged operation and if attempting to mount a corrupted image
causes a panic, that is no big deal, imho.
On 13 June 2018 at 14:33, Tetsuo Handa
<penguin-kernel@xxxxxxxxxxxxxxxxxxx> wrote:
> On 2018/05/10 8:53, Andrew Morton wrote:
>> On Thu, 10 May 2018 08:46:18 +0900 Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx> wrote:
>>
>>>> page-allocation-fauilure warning and a nice backtrace, etc. Why
>>>> suppress all of that and add our custom warning instead?
>>>
>>> the intent of this patch is to avoid panic() by panic_on_warn == 1
>>> due to hitting
>>>
>>> struct kmem_cache *kmalloc_slab(size_t size, gfp_t flags)
>>> {
>>> unsigned int index;
>>>
>>> if (unlikely(size > KMALLOC_MAX_SIZE)) {
>>> WARN_ON_ONCE(!(flags & __GFP_NOWARN)); /* <= this line */
>>> return NULL;
>>> }
>>>
>>> when size to allocate is controlled by the filesystem image.
>>
>> Well, the same could happen with many many memory-allocation sites.
>> What's special about BFS? If someone sets panic_on_warn=1 then
>> presumably this panic is the behaviour they wanted in this case.
>>
>
> Tigran, this patch is stalling. Do we want to apply this? Or, ignore as invalid?
>
> errors=panic mount option for ext4 case was ignored as invalid.
> http://lkml.kernel.org/r/CACT4Y+Z+2YW_VALJzzQr6hLsviA=dXk3iFqwVf+P5zqojeC9Zg@xxxxxxxxxxxxxx
>
> But I prefer avoiding crashes if we can fix it.
