Messages in this thread | | | Date | Tue, 30 May 2006 15:50:59 +0200 | From | Jens Axboe <> | Subject | Re: .17rc5 cfq slab corruption. |
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On Tue, May 30 2006, Dave Jones wrote: > On Tue, May 30, 2006 at 03:17:28PM +0200, Jens Axboe wrote: > > On Sat, May 27 2006, Dave Jones wrote: > > > On Sat, May 27, 2006 at 09:07:24AM +0200, Jens Axboe wrote: > > > > On Fri, May 26 2006, Andrew Morton wrote: > > > > > Dave Jones <davej@redhat.com> wrote: > > > > > > > > > > > > Was playing with googles new picasa toy, which hammered the disks > > > > > > hunting out every image file it could find, when this popped out: > > > > > > > > > > > > Slab corruption: (Not tainted) start=ffff810012b998c8, len=168 > > > > > > Redzone: 0x5a2cf071/0x5a2cf071. > > > > > > Last user: [<ffffffff8032c319>](cfq_free_io_context+0x2f/0x74) > > > > > > 090: 10 bd 28 1b 00 81 ff ff 6b 6b 6b 6b 6b 6b 6b 6b > > > > > > Prev obj: start=ffff810012b99808, len=168 > > > > > > Redzone: 0x5a2cf071/0x5a2cf071. > > > > > > Last user: [<ffffffff8032c319>](cfq_free_io_context+0x2f/0x74) > > > > > > 000: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b > > > > > > 010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b > > > > > > Next obj: start=ffff810012b99988, len=168 > > > > > > Redzone: 0x5a2cf071/0x5a2cf071. > > > > > > Last user: [<ffffffff8032c319>](cfq_free_io_context+0x2f/0x74) > > > > > > 000: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b > > > > > > 010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b > > > > > > > > Pretty baffling... cfq has been hammered pretty thoroughly over the > > > > last months and _nothing_ has shown up except some performance anomalies > > > > that are now fixed. Since daves case (at least) seems to be > > > > use-after-free, I'll see if I can reproduce with some contrived case. > > > > I'm asuming that picasa forks and exits a lot with submitted io in > > > > between than may not have finished at exit. > > > > > > The second time I hit it, was actually during boot up. > > > > Dave, do you have any io scheduler switching going on? > > Nope, everything set to use CFQ as default, and left that way.
Hrmpf ok, I had hoped perhaps something in your init scripts modified the scheduler value.
-- Jens Axboe
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