Messages in this thread | | | Date | Wed, 2 Jan 2013 11:30:10 -0500 | From | Dave Jones <> | Subject | Re: memory corruption, possibly caused by i915 |
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On Wed, Jan 02, 2013 at 11:01:15AM -0500, Chris Mason wrote: > > [52460.280346] BUG: Bad page map in process panel-6-systray pte:ffff8800b665a0e8 pmd:b6659067 > > [52460.280848] addr:00000038bf3fd000 vm_flags:00000070 anon_vma: (null) mapping:ffff88011052fd98 index:1fd > > [52460.281547] vma->vm_ops->fault: filemap_fault+0x0/0x470 > > [52460.281878] vma->vm_file->f_op->mmap: btrfs_file_mmap+0x0/0x60 [btrfs] > > > > It's falling over in btrfs's mmap op, but I think it's just the victim here, > > of something else corrupting what had been mmaped in the panel process. > > It's a btrfs file, but this isn't in our mmap op. The traces are > finding bad pages at unmap time.
Sorry, bad wording on my part.
> > Daniel, can you think of additional sanity checks that could be added to > > the i915 driver ? (Even if at the expense of speed: a CONFIG_DEBUG option > > to prove correctness would be very worthwhile imo) > > If the bad pages are getting all the way to btrfs, > CONFIG_DEBUG_PAGE_ALOC may help? You've got lockdep on so maybe you > already enabled it.
Yeah, already enabled.
Thanks.
Dave.
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