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Re: kmemcheck caught read from freed memory (cfq_free_io_context)

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From: Pekka Enberg
Subject: Re: kmemcheck caught read from freed memory (cfq_free_io_context)
Date: Wednesday, April 2, 2008 - 3:46 am

Hi Paul,

On Wed, Apr 2, 2008 at 1:40 PM, Paul E. McKenney
<paulmck@linux.vnet.ibm.com> wrote:

Yeah, that's what I thought too, that this is a SLUB bug but Peter
convinced me otherwise. SLUB keeps the _page_ around so the pointer
will be _valid_, although it might not be _your_ pointer so the caller
needs to do some validation step. Or at least that's how I understood
what Peter was saying.

                      Pekka
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Messages in current thread:
kmemcheck caught read from freed memory (cfq_free_io_context), Vegard Nossum, (Tue Apr 1, 2:08 pm)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Peter Zijlstra, (Tue Apr 1, 2:36 pm)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Paul E. McKenney, (Tue Apr 1, 3:51 pm)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Peter Zijlstra, (Tue Apr 1, 11:15 pm)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Jens Axboe, (Wed Apr 2, 12:17 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Jens Axboe, (Wed Apr 2, 12:19 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Pekka J Enberg, (Wed Apr 2, 12:20 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Jens Axboe, (Wed Apr 2, 12:24 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Ingo Molnar, (Wed Apr 2, 12:28 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Jens Axboe, (Wed Apr 2, 12:31 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Paul E. McKenney, (Wed Apr 2, 3:24 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Paul E. McKenney, (Wed Apr 2, 3:40 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Pekka Enberg, (Wed Apr 2, 3:46 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Peter Zijlstra, (Wed Apr 2, 3:49 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Peter Zijlstra, (Wed Apr 2, 3:53 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Pekka J Enberg, (Wed Apr 2, 3:54 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Paul E. McKenney, (Wed Apr 2, 3:55 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Peter Zijlstra, (Wed Apr 2, 3:59 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Pekka Enberg, (Wed Apr 2, 4:01 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Jens Axboe, (Wed Apr 2, 4:07 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Peter Zijlstra, (Wed Apr 2, 4:08 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Pekka Enberg, (Wed Apr 2, 4:11 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Jens Axboe, (Wed Apr 2, 4:13 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Peter Zijlstra, (Wed Apr 2, 4:14 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Jens Axboe, (Wed Apr 2, 4:14 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Pekka Enberg, (Wed Apr 2, 4:18 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Peter Zijlstra, (Wed Apr 2, 4:20 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Peter Zijlstra, (Wed Apr 2, 4:25 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Jens Axboe, (Wed Apr 2, 4:32 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Fabio Checconi, (Wed Apr 2, 4:33 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Peter Zijlstra, (Wed Apr 2, 4:37 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Jens Axboe, (Wed Apr 2, 4:42 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Jens Axboe, (Wed Apr 2, 4:43 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Peter Zijlstra, (Wed Apr 2, 4:47 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Jens Axboe, (Wed Apr 2, 4:53 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Peter Zijlstra, (Wed Apr 2, 5:13 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Peter Zijlstra, (Wed Apr 2, 5:26 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Jens Axboe, (Wed Apr 2, 5:28 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Jens Axboe, (Wed Apr 2, 5:34 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Jens Axboe, (Wed Apr 2, 5:36 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Jens Axboe, (Wed Apr 2, 5:36 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Fabio Checconi, (Wed Apr 2, 5:55 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Jens Axboe, (Wed Apr 2, 5:58 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Jens Axboe, (Wed Apr 2, 5:58 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Fabio Checconi, (Wed Apr 2, 6:16 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Paul E. McKenney, (Wed Apr 2, 6:26 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Paul E. McKenney, (Wed Apr 2, 6:32 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Paul E. McKenney, (Wed Apr 2, 6:37 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Jens Axboe, (Wed Apr 2, 6:40 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Jens Axboe, (Wed Apr 2, 6:41 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Andi Kleen, (Wed Apr 2, 6:43 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Paul E. McKenney, (Wed Apr 2, 8:33 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Paul E. McKenney, (Wed Apr 2, 9:08 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Paul E. McKenney, (Wed Apr 2, 9:14 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Paul E. McKenney, (Wed Apr 2, 9:15 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Vegard Nossum, (Wed Apr 2, 9:15 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Jens Axboe, (Wed Apr 2, 9:31 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Pekka J Enberg, (Wed Apr 2, 9:32 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Paul E. McKenney, (Wed Apr 2, 9:59 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Paul E. McKenney, (Wed Apr 2, 10:00 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Vegard Nossum, (Wed Apr 2, 10:31 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Christoph Lameter, (Wed Apr 2, 10:35 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Christoph Lameter, (Wed Apr 2, 10:36 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Paul E. McKenney, (Wed Apr 2, 11:23 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Pekka Enberg, (Wed Apr 2, 12:53 pm)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Paul E. McKenney, (Wed Apr 2, 1:15 pm)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Paul E. McKenney, (Thu Apr 3, 8:18 am)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Pekka J Enberg, (Thu Apr 3, 12:49 pm)
Re: kmemcheck caught read from freed memory (cfq_free_io_c ..., Paul E. McKenney, (Thu Apr 3, 2:27 pm)