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From: Andrea Arcangeli <andrea@suse.de>
To: Ingo Molnar <mingo@elte.hu>
Cc: Andrew Morton <akpm@osdl.org>,
	linas@austin.ibm.com, linux-kernel@vger.kernel.org
Subject: Re: PATCH: Race in 2.6.0-test2 timer code
Date: Wed, 30 Jul 2003 23:19:32 +0200	[thread overview]
Message-ID: <20030730211932.GY23835@dualathlon.random> (raw)
In-Reply-To: <20030730123458.GM23835@dualathlon.random>

On Wed, Jul 30, 2003 at 02:34:58PM +0200, Andrea Arcangeli wrote:
> x86.  I never reproduced this myself. I will ask more info on bugzilla,

I've the confirmation it was reproduced on x86, so the timer should have
been running in the same cpu where it was queued (i.e. the base should
have been the same for both del_timer_sync and add_timer). So at the
moment it's not clear what race that patch fixed, but nevertheless I
feel much safer to keep this obviously safe additional locking applied
until we know for sure ;) And I've the confirmation that it makes the
2.4 kernel stable again.

FYI, if I don't answer to further emails on this in the next days, it's
because I'll be on vacations the next 14 days.

Andrea

  parent reply	other threads:[~2003-07-30 21:19 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-29 15:41 PATCH: Race in 2.6.0-test2 timer code linas
2003-07-29 20:56 ` Andrew Morton
2003-07-30  5:57   ` Ingo Molnar
2003-07-30  6:36     ` Andrew Morton
2003-07-30  7:07       ` Ingo Molnar
2003-07-30  7:34         ` Andrea Arcangeli
2003-07-30  7:34           ` Ingo Molnar
2003-07-30  8:28             ` Andrea Arcangeli
2003-07-30 10:31               ` Ingo Molnar
2003-07-30 11:16                 ` Andrea Arcangeli
2003-07-30 11:49                   ` Ingo Molnar
2003-07-30 12:34                     ` Andrea Arcangeli
2003-07-30 21:18                       ` linas
2003-07-30 22:06                         ` Andrea Arcangeli
2003-07-30 22:17                           ` Andrea Arcangeli
2003-07-31  7:04                             ` Ingo Molnar
2003-07-30 21:19                       ` Andrea Arcangeli [this message]
2003-07-30 23:43                 ` linas
2003-07-30 23:56                   ` Andrea Arcangeli
2003-07-30 23:54                     ` Andrew Morton
2003-07-31  0:16                       ` Andrea Arcangeli
2003-07-31 17:23                     ` linas
2003-08-01  6:27                       ` Ingo Molnar
2003-07-30  7:40           ` Ingo Molnar
2003-07-30  8:37             ` Andrea Arcangeli
2003-07-30 10:34               ` Ingo Molnar
2003-07-30 10:51                 ` Andrew Morton
2003-07-30 11:28                   ` Andrea Arcangeli
2003-07-30 11:22                 ` Andrea Arcangeli
2003-07-30 20:05     ` linas
2003-07-31  6:50       ` Ingo Molnar
2003-07-31 22:56     ` linas
2003-08-01  6:23       ` Ingo Molnar

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