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Date: Fri, 30 May 2008 11:19:28 -0700 From: ebiederm@...ssion.com (Eric W. Biederman) To: Dave Jones <davej@...hat.com> Cc: Linux Kernel <linux-kernel@...r.kernel.org> Subject: Re: kernel: sysctl table check failed: /dev/parport/parport0/devices/ppdev0/timeslice Sysctl already exists Dave Jones <davej@...hat.com> writes: > Well, that's umm, special. > I wonder if powering off the printer isn't causing the sysctl to be removed, > causing the next power-on to look like a new device ? > Eric, you poked around the sysctl paths in parport last year, any ideas? Yes. The short answer is that this is a real bug in the parport code that has existed forever. We just now complain. http://bugzilla.kernel.org/show_bug.cgi?id=9749 It takes something like two accessors of the parallel port to trigger this. Though not in a bad way. In particular each open creates the sysctl for the duration of the open (or something like that) and so if you open (I think it is /dev/parport0) twice you try and create the sysctls twice. I got as far as basic confirmation of this bug, and a rough cause of it. Unfortunately I have not had the time to unscramble it, and neither it seems has anyone else. Eric -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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