Date: Fri, 30 Mar 2001 14:16:51 -0800 From: "Chris Ptacek" <chris@ptacek.net> To: "Alfred Perlstein" <bright@wintelcom.net> Cc: <freebsd-hackers@FreeBSD.ORG> Subject: Re: Page Fault problem with my KLD Message-ID: <001901c0b967$1f165060$cafba8c0@sitaranetworks.com> References: <001301c0b940$3d48ca80$cafba8c0@sitaranetworks.com> <20010330130336.B9431@fw.wintelcom.net>
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Thanks, I figured this problem out this afternoon (now on to the others :) Turns out that the "library" code I was using was using user level memcpy. - Chris BTW: I am currently having a problem that if I load, unload, and then load again my system seems to freeze. I can tell the driver is still running (it prints a debug message every second) and kldload does return, but if I try and do anything it just freezes (ls, kldunload, etc). Any ideas. - Chris ----- Original Message ----- From: "Alfred Perlstein" <bright@wintelcom.net> To: "Chris Ptacek" <chris@ptacek.net> Cc: <freebsd-hackers@FreeBSD.ORG> Sent: Friday, March 30, 2001 1:03 PM Subject: Re: Page Fault problem with my KLD > * Chris Ptacek <chris@ptacek.net> [010330 09:45] wrote: > > I am developing a KLD and I am having problems getting a page fault. I am > > using a set "library" (basically a set of third party object files I build > > and then link in). This libarary requires its own chunk of memory that it > > manages and needs to be passed a pointer to that memory (and the size) when > > it is initialized. So during my load phase I malloc the memory (14M), at > > this point I can traverse the memory just fine using a for loop writing and > > reading from it as a test. However once I pass this memory into the > > "library" to use, I get a page fault error. Is there something I am missing > > here? What would be the possible causes of the page fault? > > Page faults are caused by referencing memory that you shouldn't. > > See: http://www.freebsd.org/handbook/kerneldebug.html > > > Any and all help would be appreciated and if you could CC this account I > > would appreciate it (my FreeBSD mailing list subscriptions are from another > > account). > > Next time offer a test snippet of code that demonstrates the problem. > > -- > -Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org] > Daemon News Magazine in your snail-mail! http://magazine.daemonnews.org/ > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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