On 10/22/2016 11:20 AM, Dave Jones wrote:
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)
Well crud, we're back to wondering if this is Btrfs or the stack corruption. Since the pagevecs are on the stack and this is a new crash, my guess is you'll be able to trigger it on xfs/ext4 too. But we should make sure.
-chris
