From: kuznet@ms2.inr.ac.ru
To: davem@redhat.com (David S. Miller)
Cc: george@mvista.com, ak@suse.de, netdev@oss.sgi.com,
linux-net@vger.kernel.org, ak@muc.de, pekkas@netcore.fi
Subject: Re: System crash in tcp_fragment()
Date: Tue, 21 May 2002 05:00:11 +0400 (MSD) [thread overview]
Message-ID: <acc6aj$inp$2@main.gmane.org> (raw)
In-Reply-To: <20020520.173416.105610032.davem@redhat.com> from "David S. Miller" at May 20, 2 05:34:16 pm
Hello!
> Such rule does not even make this piece of code legal. Consider:
>
> task1:cpu0: x = counters[smp_processor_id()];
> cpu0: PREEMPT
> task2:cpu0: x = counters[smp_processor_id()];
> task2:cpu0: counters[smp_processor_id()] = x + 1;
> cpu0: PREEMPT
> task1:cpu0: counters[smp_processor_id()] = x + 1;
> full garbage
Yup. And this has nothing to do with SMP...
> But it does bring up important point, preemption people need to
> fully audit entire networking.
Well, we can make this. It is too serious. Anyway, this means that
preemptive patch for 2.4 is "tainting" :-)
Alexey
next parent reply other threads:[~2002-05-21 1:00 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20020520.173416.105610032.davem@redhat.com>
2002-05-21 1:00 ` kuznet [this message]
2002-05-21 1:49 ` System crash in tcp_fragment() Nivedita Singhvi
[not found] <Pine.LNX.4.33.0205201836160.9301-100000@w-nivedita2.des.beaverton.ibm.com>
[not found] ` <3CE9E466.AC2358EE@mvista.com>
2002-05-21 6:00 ` David S. Miller
[not found] ` <20020520.230021.29510217.davem@redhat.com>
2002-05-21 7:25 ` george anzinger
2002-05-21 9:49 ` Andi Kleen
[not found] ` <3CE9F679.90ACF597@mvista.com>
2002-05-21 7:22 ` David S. Miller
2002-05-21 12:47 ` kuznet
2002-05-21 15:42 ` george anzinger
2002-05-21 12:54 ` Andi Kleen
2002-05-21 6:08 ` george anzinger
[not found] <3CE9960D.15D41380@mvista.com>
[not found] ` <200205210041.EAA04407@sex.inr.ac.ru>
2002-05-21 0:34 ` David S. Miller
2002-05-21 0:41 ` kuznet
[not found] <20020521015407.A1296@wotan.suse.de>
2002-05-21 0:11 ` kuznet
2002-05-21 0:20 ` Andi Kleen
2002-05-21 0:26 ` george anzinger
[not found] ` <20020521022007.A6248@wotan.suse.de>
2002-05-21 0:34 ` george anzinger
[not found] ` <3CE99434.20E7479C@mvista.com>
2002-05-21 0:18 ` David S. Miller
2002-05-21 0:39 ` Andi Kleen
[not found] <3CE95190.75C52E2D@mvista.com>
2002-05-20 20:29 ` Andi Kleen
[not found] ` <20020520222937.A1467@averell>
2002-05-20 21:18 ` george anzinger
2002-05-20 21:25 ` kuznet
2002-05-20 22:08 ` David S. Miller
[not found] ` <200205202125.BAA03545@sex.inr.ac.ru>
2002-05-20 23:01 ` george anzinger
2002-05-20 23:54 ` Andi Kleen
2002-05-20 19:42 george anzinger
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