From: Arkadiusz Miskiewicz <arekm@maven.pl>
To: Mikael Pettersson <mikpe@it.uu.se>
Cc: "Wahlig, Elsie" <elsie.wahlig@amd.com>, linux-kernel@vger.kernel.org
Subject: Re: Opteron Rev E has a bug ... a locked instruction doesn't act as a read-acquire barrier (confirmed)
Date: Mon, 11 Aug 2008 19:03:06 +0200 [thread overview]
Message-ID: <200808111903.06953.arekm@maven.pl> (raw)
In-Reply-To: <18585.64037.521673.362547@alkaid.it.uu.se>
On Wednesday 06 August 2008, Mikael Pettersson wrote:
> On Wed, 6 Aug 2008 19:13:34 +0200, Arkadiusz Miskiewicz wrote:
> >On Wednesday 06 August 2008, Wahlig, Elsie wrote:
> >> Your issue may be one that has been seen on 1st generation
> >> AMD Opteron processor's with cpuid family 0Fh, cpuid model's
> >> < 40h with the code sequence that performs a read-modify write
> >> operation after acquiring a semaphore.
[...]
> Also I think I'll start by writing a user-space test program that
> does a stress-test of the plain lock;rmw;unlobk sequence to see if
> it can break it. (Locks/mutexes are also used in user-space.)
Bugreported so hopefully it won't be lost.
http://bugzilla.kernel.org/show_bug.cgi?id=11305
> /Mikael
--
Arkadiusz Miśkiewicz PLD/Linux Team
arekm / maven.pl http://ftp.pld-linux.org/
prev parent reply other threads:[~2008-08-11 17:03 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CB2417C2B1152C41919D5B9DE58840FA72D828@sausexmb5.amd.com>
2008-08-06 17:13 ` Arkadiusz Miskiewicz
2008-08-06 19:23 ` Mikael Pettersson
2008-08-06 21:18 ` Wahlig, Elsie
2008-08-11 17:03 ` Arkadiusz Miskiewicz [this message]
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