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From: Suresh Siddha <suresh.b.siddha@intel.com>
To: Wolfgang Walter <wolfgang.walter@stwm.de>
Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@elte.hu>
Subject: Re: Kernel oops with 2.6.26, padlock and ipsec: probably problem with fpu state changes
Date: Fri, 8 Aug 2008 12:32:53 -0700	[thread overview]
Message-ID: <20080808193252.GD607@linux-os.sc.intel.com> (raw)
In-Reply-To: <200808082109.47284.wolfgang.walter@stwm.de>

On Fri, Aug 08, 2008 at 12:09:46PM -0700, Wolfgang Walter wrote:
> I don't know though why kernel_fpu_begin exactly fixes the problem:

because it prevents taking a DNA fault inside the kernel (resulting
in TS_USEDFPU not set).

> 
> Maybe preemption must be disabled when padlocks RNG, ACE, Hash-engine etc. is
> used. Maybe just some barrier is needed which preempt_disable provides.

problem can happen even when preemption is disabled.

> What should I do now?

I will post your fix(including the other usages) with the appropriate changelog
shortly.

thanks,
suresh

  reply	other threads:[~2008-08-08 19:33 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-07-17 14:53 Kernel oops with 2.6.26 and ipsec (Was: Re: IPSEC in 2.6.25 causes stalled connections) Wolfgang Walter
2008-07-17 20:42 ` Kernel oops with 2.6.26 and ipsec Wolfgang Walter
     [not found] ` <200807301411.01622.wolfgang.walter@stwm.de>
     [not found]   ` <20080806103354.GA31623@gondor.apana.org.au>
2008-08-06 17:33     ` Kernel oops with 2.6.26, padlock and ipsec: probably problem with fpu state changes Wolfgang Walter
2008-08-06 20:14       ` Suresh Siddha
2008-08-06 21:21         ` Suresh Siddha
2008-08-07  0:38           ` Wolfgang Walter
2008-08-08  8:44           ` Wolfgang Walter
2008-08-08 18:31           ` Vegard Nossum
2008-08-07 16:23         ` Wolfgang Walter
2008-08-08 10:36           ` Wolfgang Walter
2008-08-08 18:53             ` Suresh Siddha
2008-08-08 19:01               ` H. Peter Anvin
2008-08-08 19:19                 ` Wolfgang Walter
2008-08-08 23:11                 ` Suresh Siddha
2008-08-09  0:38                   ` Herbert Xu
2008-08-09  1:23                     ` Herbert Xu
2008-08-09  1:54                     ` Wolfgang Walter
2008-08-09  2:16                       ` Herbert Xu
2008-08-09  3:09                         ` Wolfgang Walter
2008-08-09  3:20                           ` Herbert Xu
2008-08-09 14:29                     ` Herbert Xu
2008-08-09 14:32                       ` Herbert Xu
2008-08-09 17:52                         ` Suresh Siddha
2008-08-10  5:30                           ` Herbert Xu
2008-08-10  5:41                             ` H. Peter Anvin
2008-08-11 22:57                               ` Suresh Siddha
2008-08-09 17:48                     ` Suresh Siddha
2008-08-09  1:28                   ` Wolfgang Walter
2008-08-09 13:31                   ` Herbert Xu
2008-08-09 14:37                   ` Herbert Xu
2008-08-09 15:14                     ` Wolfgang Walter
2008-08-09 15:57                     ` Wolfgang Walter
2008-08-09 16:10                       ` H. Peter Anvin
2008-08-09 17:02                         ` Wolfgang Walter
2008-08-09 18:52                         ` Suresh Siddha
2008-08-09 19:37                           ` Suresh Siddha
2008-08-09 22:59                             ` Wolfgang Walter
2008-08-10  3:05                             ` Herbert Xu
2008-08-11 19:01                               ` Suresh Siddha
2008-08-11 19:22                                 ` Ingo Molnar
2008-08-11 19:24                                   ` H. Peter Anvin
2008-08-11 20:19                                     ` Suresh Siddha
2008-08-12  0:39                                       ` Herbert Xu
2008-08-12  0:42                                         ` H. Peter Anvin
2008-08-12  0:46                                           ` Herbert Xu
2008-08-12  0:48                                             ` H. Peter Anvin
2008-08-12  0:52                                               ` Herbert Xu
2008-08-12  0:38                                 ` Wolfgang Walter
2008-08-12 11:43                                 ` Wolfgang Walter
2008-08-12 12:02                                   ` Herbert Xu
2008-08-12 18:28                                     ` Suresh Siddha
2008-08-12 23:40                                       ` Herbert Xu
2008-08-09 18:12                       ` Suresh Siddha
2008-08-09 18:54                         ` Suresh Siddha
2008-08-09 16:05                     ` H. Peter Anvin
2008-08-09 18:14                       ` Suresh Siddha
2008-08-10  0:29                       ` Herbert Xu
2008-08-10  1:56                         ` Wolfgang Walter
2008-08-10  1:59                           ` Herbert Xu
2008-08-09 17:59                     ` Suresh Siddha
2008-08-10  1:40                       ` Herbert Xu
2008-08-09  1:49                 ` Herbert Xu
2008-08-09  1:59                   ` H. Peter Anvin
2008-08-09  2:43                   ` Wolfgang Walter
2008-08-09  3:30                     ` H. Peter Anvin
2008-08-09 10:50                       ` Wolfgang Walter
2008-08-08 19:09             ` Wolfgang Walter
2008-08-08 19:32               ` Suresh Siddha [this message]
2008-08-08 23:10                 ` Wolfgang Walter
2008-08-08 23:15                   ` Suresh Siddha

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