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)
[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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