Date: Mon, 21 Dec 1998 18:30:20 -0800 From: Mike Smith <mike@smith.net.au> To: Greg Lehey <grog@lemis.com> Cc: Mike Smith <mike@smith.net.au>, current@FreeBSD.ORG Subject: Re: trap 12 with interrupts disabled Message-ID: <199812220230.SAA02237@dingo.cdrom.com> In-Reply-To: Your message of "Tue, 22 Dec 1998 12:58:58 %2B1030." <19981222125858.X85005@freebie.lemis.com>
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> On Monday, 21 December 1998 at 18:25:33 -0800, Mike Smith wrote: > >>>>> 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 > > > > Usually you're lucky and something else turns them on unconditionally. > > This test simply makes damn sure that if you take a fault interrupts > > get turned back on. > > Ah. You mean we don't block the fault, just other interrupts? That > makes more sense. Yes; traps aren't interrupts. -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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