From: Ingo Molnar <mingo@elte.hu>
To: Nick Piggin <npiggin@suse.de>
Cc: David Miller <davem@davemloft.net>,
duaneg@dghda.com, linux-kernel@vger.kernel.org
Subject: Re: 2.6.23 regression: accessing invalid mmap'ed memory from gdb causes unkillable spinning
Date: Fri, 2 Nov 2007 16:36:43 +0100 [thread overview]
Message-ID: <20071102153643.GA29354@elte.hu> (raw)
In-Reply-To: <20071102104554.GA941@wotan.suse.de>
* Nick Piggin <npiggin@suse.de> wrote:
> > This means that even if some cpu is stuck in a spinlock loop with
> > interrupts disabled, you'd see it with this thing. The way it works
> > is that cross cpu vectored interrupts are disabled independently of
> > the processor interrupt level on sparc64.
>
> That's really sweet. I'd better put my code where my mouth is as
> well... this patch seems to be about the best we can do as a generic
> fallback without getting a dedicated vector (which has to be done in
> arch code anyway).
btw., in -rt we had something like this implemented as an NMI mechanism
(for x86) - that way it's guaranteed that we get some output even from
locked up CPUs.
Ingo
prev parent reply other threads:[~2007-11-02 15:37 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-31 0:45 2.6.23 regression: accessing invalid mmap'ed memory from gdb causes unkillable spinning Duane Griffin
2007-10-31 4:19 ` Nick Piggin
2007-10-31 10:27 ` Duane Griffin
2007-10-31 15:11 ` Linus Torvalds
2007-10-31 15:19 ` Nick Piggin
2007-10-31 15:59 ` Linus Torvalds
2007-10-31 17:19 ` Duane Griffin
2007-10-31 22:55 ` Nick Piggin
2007-10-31 23:08 ` Linus Torvalds
2007-11-01 2:37 ` Nick Piggin
2007-11-01 15:14 ` Linus Torvalds
2007-11-01 15:47 ` Nick Piggin
2007-11-01 16:08 ` Linus Torvalds
2007-11-01 23:56 ` Nick Piggin
2007-11-02 1:17 ` Linus Torvalds
2007-11-02 6:30 ` Nick Piggin
2007-10-31 6:42 ` Nick Piggin
2007-10-31 6:56 ` David Miller
2007-10-31 7:41 ` Nick Piggin
2007-10-31 7:44 ` David Miller
2007-11-02 5:02 ` David Miller
2007-11-02 10:45 ` Nick Piggin
2007-11-02 15:36 ` Ingo Molnar [this message]
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