Messages in this thread | | | Date | Tue, 30 Jun 2015 15:28:44 -0400 | From | Dave Jones <> | Subject | Re: [4.1-rc7] btrfs related VM_BUG_ON in filemap.c |
| |
On Tue, Jun 30, 2015 at 03:23:00PM -0400, Josef Bacik wrote: > On 06/30/2015 03:20 PM, Dave Jones wrote: > > On Wed, Jun 17, 2015 at 09:35:41AM -0400, Dave Jones wrote: > > > > > page:ffffea00027cc640 count:4 mapcount:0 mapping:ffff8800af11d8a0 index:0x0 > > > flags: 0x4000000000000846(error|referenced|active|private) > > > page dumped because: VM_BUG_ON_PAGE(!PageLocked(page)) > > > ------------[ cut here ]------------ > > > kernel BUG at mm/filemap.c:745! > > > > Still occasionally bumping into this. > > The 'count:4 mapcount:0' is constant in every instance I've seen > > so far. Could that be a clue ? > > > > I've seen various page flags, but it's always !locked > > > > Ideas on additional debugging I could add ? > > Huh I just noticed that PG_Error seems to be set, is that the same for > every time? I wonder where that's getting set and why. I'll dig into > the areas we set that and see if I can spot anything. Thanks,
Seems to be set every time yeah. I can try annotating those places that set it to see which one is triggering when I get home.
Dave
| |