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SubjectRe: bio linked list corruption.
On Fri, Oct 21, 2016 at 04:02:45PM -0400, Dave Jones wrote:

> > It could be worth trying this, too:
> >
> > https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/commit/?h=x86/vmap_stack&id=174531fef4e8
> >
> > It occurred to me that the current code is a little bit fragile.
>
> It's been nearly 24hrs with the above changes, and it's been pretty much
> silent the whole time.
>
> The only thing of note over that time period has been a btrfs lockdep
> warning that's been around for a while, and occasional btrfs checksum
> failures, which I've been seeing for a while, but seem to have gotten
> worse since 4.8.
>
> I'm pretty confident in the disk being ok in this machine, so I think
> the checksum warnings are bogus. Chris suggested they may be the result
> of memory corruption, but there's little else going on.

The only interesting thing last nights run was this..

BUG: Bad page state in process kworker/u8:1 pfn:4e2b70
page:ffffea00138adc00 count:0 mapcount:0 mapping:ffff88046e9fc2e0 index:0xdf0
flags: 0x400000000000000c(referenced|uptodate)
page dumped because: non-NULL mapping
CPU: 3 PID: 24234 Comm: kworker/u8:1 Not tainted 4.9.0-rc1-think+ #11
Workqueue: writeback wb_workfn (flush-btrfs-2)
ffffc90001f97828
ffffffff8130d07c
ffffea00138adc00
ffffffff819ff524
ffffc90001f97850
ffffffff8115117f
0000000000000000
ffffea00138adc00
400000000000000c
ffffc90001f97860
ffffffff8115123a
ffffc90001f978a8
Call Trace:
[<ffffffff8130d07c>] dump_stack+0x4f/0x73
[<ffffffff8115117f>] bad_page+0xbf/0x120
[<ffffffff8115123a>] free_pages_check_bad+0x5a/0x70
[<ffffffff81153b38>] free_hot_cold_page+0x248/0x290
[<ffffffff81153e3b>] free_hot_cold_page_list+0x2b/0x50
[<ffffffff8115c84d>] release_pages+0x2bd/0x350
[<ffffffff8115dd82>] __pagevec_release+0x22/0x30
[<ffffffffa009cd4e>] extent_write_cache_pages.isra.48.constprop.63+0x32e/0x400 [btrfs]
[<ffffffffa009d199>] extent_writepages+0x49/0x60 [btrfs]
[<ffffffffa007d840>] ? btrfs_releasepage+0x40/0x40 [btrfs]
[<ffffffffa007a993>] btrfs_writepages+0x23/0x30 [btrfs]
[<ffffffff8115af6c>] do_writepages+0x1c/0x30
[<ffffffff811f6d33>] __writeback_single_inode+0x33/0x180
[<ffffffff811f7528>] writeback_sb_inodes+0x2a8/0x5b0
[<ffffffff811f78bd>] __writeback_inodes_wb+0x8d/0xc0
[<ffffffff811f7b73>] wb_writeback+0x1e3/0x1f0
[<ffffffff811f80b2>] wb_workfn+0xd2/0x280
[<ffffffff81090875>] process_one_work+0x1d5/0x490
[<ffffffff81090815>] ? process_one_work+0x175/0x490
[<ffffffff81090b79>] worker_thread+0x49/0x490
[<ffffffff81090b30>] ? process_one_work+0x490/0x490
[<ffffffff81095cee>] kthread+0xee/0x110
[<ffffffff81095c00>] ? kthread_park+0x60/0x60
[<ffffffff81790bd2>] ret_from_fork+0x22/0x30

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