linux-kernel - Re: [mm/page_alloc] 44042b4498: WARNING:possible_recursive_locking

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Date:   Wed, 28 Jul 2021 13:14:21 +0800
From:   Oliver Sang <oliver.sang@...el.com>
To:     Mel Gorman <mgorman@...hsingularity.net>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>, Zi Yan <ziy@...dia.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Michal Hocko <mhocko@...nel.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        lkp@...el.com
Subject: Re: [mm/page_alloc]  44042b4498:
 WARNING:possible_recursive_locking_detected

hi Mel Gorman,

On Tue, Jul 27, 2021 at 03:35:38PM +0100, Mel Gorman wrote:
> On Tue, Jul 27, 2021 at 10:31:36PM +0800, kernel test robot wrote:
> > 
> > 
> > Greeting,
> > 
> > FYI, we noticed the following commit (built with gcc-9):
> > 
> > commit: 44042b4498728f4376e84bae1ac8016d146d850b ("mm/page_alloc: allow high-order pages to be stored on the per-cpu lists")
> > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> > 
> 
> Does this warning happen after 187ad460b841 ("mm/page_alloc: avoid page
> allocator recursion with pagesets.lock held")? I ask because I see the
> stack_depot_save in the warning.

from our tests, this warning cannot be reproduced upon 187ad460b841.
Thanks for information!

> 
> -- 
> Mel Gorman
> SUSE Labs