linux-kernel - Re: [PATCH] debugobject: don't wake up kswapd from fill

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 12 May 2023 14:54:20 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     syzbot <syzbot+fe0c72f0ccbb93786380@...kaller.appspotmail.com>,
        syzkaller-bugs@...glegroups.com, Ingo Molnar <mingo@...e.hu>,
        linux-kernel@...r.kernel.org, linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH] debugobject: don't wake up kswapd from fill_pool()

On Fri, May 12 2023 at 19:57, Tetsuo Handa wrote:
> On 2023/05/12 12:44, Andrew Morton wrote:
>> On Thu, 11 May 2023 22:47:32 +0900 Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> wrote:
>> 
>>> syzbot is reporting lockdep warning in fill_pool(), for GFP_ATOMIC is
>>> (__GFP_HIGH | __GFP_KSWAPD_RECLAIM) which wakes up kswapd.
>>> Since fill_pool() might be called with arbitrary locks held,
>>> fill_pool() should not assume that holding pgdat->kswapd_wait is safe.

https://lore.kernel.org/lkml/871qjldbes.ffs@tglx/