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Date: Mon, 31 Jul 2017 14:09:02 +0200
From: Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH, RFC] xfs: fix multi-AG deadlock in xfs_bunmapi
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References: <20170718172545.18065-1-hch@lst.de> <ac50dda7-6147-1bb2-78ed-b49dafaec242@gmail.com> <09500343-740e-0178-c60a-6ea5e6993c11@gmail.com> <20170720074706.GA22218@lst.de> <0eb47db7-24de-a231-be9f-73d9ae1171fd@gmail.com> <20170720074924.GA22278@lst.de> <16f95f63-1111-9d3c-344c-6b42ddab3b55@gmail.com> <20170726130442.GA24681@lst.de> <dfaa4bb9-1915-c1c6-af7e-38cb2d9ad6b7@gmail.com>
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To: Nikolay Borisov <n.borisov.lkml@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>, linux-xfs@vger.kernel.org

Hi Nikolay,

On Fri, Jul 28, 2017 at 09:05:51AM +0300, Nikolay Borisov wrote:
> Couldn't repro on 4.11 and 4.10 (which supposedly shouldn't have the
> fixes). I tried running generic/299 200 times on each kernel. Which
> exactly are the patches in 4.11 which fix the alloc path?

My suspects in 4.11 would be:

xfs: don't fail xfs_extent_busy allocation
xfs: improve handling of busy extents in the low-level allocator
xfs: fix len comparison in xfs_extent_busy_trim

4.10 also had a couple allocator fixes, but nothing that looks
directly related.