Re: [syzbot] [mm?] WARNING in mas_nomem

[Vlastimil Babka (SUSE)]

On 8/5/26 02:46, Jason Gunthorpe wrote:
> On Fri, Jul 31, 2026 at 06:07:24PM +0200, Vlastimil Babka (SUSE) wrote:
> 
>> > Thanks to Vlastimil and Pedro for the help on the plan.
>> > 
>> > Summary of previous conversation is here:
>> > https://lore.kernel.org/all/20260618152451.GE231643@xxxxxxxx/
>> 
>> Yeah, unfortunately, "too small to fail" is a lie, because in some cases it
>> can fail (such as the task itself becoming oom killer victim) or any of the
>> other conditions that can cause __alloc_pages_may_oom() return with
>> *did_some_progress == 0.
> 
> But then we are back to the original problem, an erase API that can
> fail is fundamentally broken.

That's why the plan is to add __GFP_NOFAIL, which overrides the
possibilities to fail listed above.

> Jason