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Date:      Tue, 22 Dec 1998 12:51:04 +1030
From:      Greg Lehey <grog@lemis.com>
To:        Mike Smith <mike@smith.net.au>, current@FreeBSD.ORG
Subject:   Re: trap 12 with interrupts disabled
Message-ID:  <19981222125104.V85005@freebie.lemis.com>
In-Reply-To: <199812220216.SAA02117@dingo.cdrom.com>; from Mike Smith on Mon, Dec 21, 1998 at 06:16:25PM -0800
References:  <19981222124410.R85005@freebie.lemis.com> <199812220216.SAA02117@dingo.cdrom.com>

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On Monday, 21 December 1998 at 18:16:25 -0800, Mike Smith wrote:
>> On Monday, 21 December 1998 at 15:52:47 -0800, Mike Smith wrote:
>>>
>>> Just thought after all the discussion about X servers and interupts,
>>> this one might be interesting:
>>>
>>> pid 281 (Xaccel): trap 12 with interupts disabled
>>
>> Yes, I've noticed this one too.  It seems to have crept in relatively
>> recently, and strangely seems not to cause any problems.
>
> The diagnostic just warns of a bad situation (Xaccel has turned off
> interrupts for some reason, and then pagefaulted), it doesn't mention
> that it has in fact turned interrupts back on so that the pagefault can
> be safely completed.

If my page fault fails because I've blocked the interrupt, I'd expect
some serious damage to happen to the process environment.n

Greg
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