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Date: Fri, 26 Aug 2016 09:28:50 -0700
From: "Darrick J. Wong" <darrick.wong@oracle.com>
Subject: Re: [PATCH v8 00/71] xfs: add reflink and dedupe support
Message-ID: <20160826162850.GE22760@birch.djwong.org>
References: <147216791538.867.12413509832420924168.stgit@birch.djwong.org>
	<20160826125636.GA1548@infradead.org>
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To: Christoph Hellwig <hch@infradead.org>
Cc: linux-xfs@vger.kernel.org, xfs@oss.sgi.com

On Fri, Aug 26, 2016 at 05:56:36AM -0700, Christoph Hellwig wrote:
> FTI, with your djwong-devel tree I see sporadic slab corruption when
> running xfstests with reflinks force enabled in mkfs.
> 
> And while the trace looks like from the rmap code it doesn't happen
> without the reflink patches.
> 
> Example during xfs/313 below:
> 
> [14751.774252] Slab corruption (Tainted: G        W      ): xfs_cui_item start=ffff88013afb3748, len=408
> [14751.775170] Redzone: 0x9f911029d74e35b/0x9f911029d74e35b
> [14751.775731] Last user: [<ffffffff815ce4cc>](xfs_cui_item_free+0x1c/0x30)
> [14751.776397] 070: 6b 6b 6b 6b 6b 6b 6b 6b 6a 6b 6b 6b 6b 6b 6b 6b kkkkkkkkjkkkkkkk
> [14751.777157] Single bit error detected. Probably bad RAM.
> [14751.777591] Run memtest86+ or a similar memory test tool.
> [14751.778015] Prev obj: start=ffff88013afb3598, len=408
> [14751.778468] Redzone: 0x9f911029d74e35b/0x9f911029d74e35b
> [14751.778940] Last user:
> [<ffffffff815ce4cc>](xfs_cui_item_free+0x1c/0x30)

CUI == refCount Update Item, so it /is/ the reflink code.

Will take a look.  Sigh...

--D

> [14751.779621] 000: 6b 6b 6b 6b 6b 00 01 02 03 6b 6b 6b 6b 6b 6b 6b kkkkk....kkkkkkk
> [14751.780378] 010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
> [14751.781140] Next obj: start=ffff88013afb38f8, len=408
> [14751.781639] Redzone: 0x9f911029d74e35b/0x9f911029d74e35b
> [14751.782216] Last user:
> [<ffffffff815ce4cc>](xfs_cui_item_free+0x1c/0x30)
> [14751.782885] 000: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
> [14751.783608] 010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
> [14751.784287] Slab corruption (Tainted: G        W      ): xfs_bui_item start=ffff880131b67048, len=184
> [14751.785126] Redzone: 0x9f911029d74e35b/0x9f911029d74e35b
> [14751.785979] Last user: [<ffffffff815c9584>](xfs_bui_release+0x44/0x70)0
> [14751.786636] 070: 6b 6b 6b 6b 6b 6b 6b 6b 6a 6b 6b 6b 6b 6b 6b 6b kkkkkkkkjkkkkkkk
> [14751.787414] Single bit error detected. Probably bad RAM.
> [14751.787948] Run memtest86+ or a similar memory test tool.
> [14751.788477] Next obj: start=ffff880131b67118, len=184
> [14751.789002] Redzone: 0x9f911029d74e35b/0x9f911029d74e35b
> [14751.789559] Last user: [<ffffffff815c9584>](xfs_bui_release+0x44/0x70)
> [14751.790259] 000: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
> [14751.791055] 010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
> 
> --
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