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Date:   Fri, 3 Nov 2023 16:42:20 -0600
From:   Keith Busch <kbusch@kernel.org>
To:     Marek Marczykowski-G'orecki <marmarek@invisiblethingslab.com>
Cc:     Mikulas Patocka <mpatocka@redhat.com>, Jens Axboe <axboe@fb.com>,
        Christoph Hellwig <hch@lst.de>,
        Sagi Grimberg <sagi@grimberg.me>, Jan Kara <jack@suse.cz>,
        Vlastimil Babka <vbabka@suse.cz>,
        Andrew Morton <akpm@linux-foundation.org>,
        Matthew Wilcox <willy@infradead.org>,
        Michal Hocko <mhocko@suse.com>, stable@vger.kernel.org,
        regressions@lists.linux.dev, Alasdair Kergon <agk@redhat.com>,
        Mike Snitzer <snitzer@kernel.org>, dm-devel@lists.linux.dev,
        linux-mm@kvack.org
Subject: Re: Intermittent storage (dm-crypt?) freeze - regression 6.4->6.5
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On Fri, Nov 03, 2023 at 09:30:07PM +0100, Marek Marczykowski-G'orecki wrote:
> On Fri, Nov 03, 2023 at 10:54:00AM -0600, Keith Busch wrote:
> > On Fri, Nov 03, 2023 at 05:15:49PM +0100, Marek Marczykowski-G'orecki wrote:
> > > On Thu, Nov 02, 2023 at 06:06:33PM +0100, Mikulas Patocka wrote:
> > > > Then, try this patch (without "iommu=panic"), reproduce the deadlock and 
> > > > tell us which one of the "printk" statements is triggered during the 
> > > > deadlock.
> > > 
> > > The "821" one - see below.
> > 
> > Thanks for confirming!
> > 
> > Could you try this patch?
> 
> Besides min3() being unhappy about types, it works.

Oops, should have changed the constant to "ul" instead of just "u".

Anyway, the overall idea makes sense to me, but I don't know the swiotlb
stuff well.

Christoph, does that patch make sense? For reference:

   https://lore.kernel.org/linux-mm/ZUOr-vp0yRkLyvyi@kbusch-mbp.dhcp.thefacebook.com/T/#m8d34245e0eef43f8e9fe6cba6038d77ed2a93ad6