Date: Thu, 15 Apr 2004 19:42:00 -0700 (PDT) From: Doug White <dwhite@gumbysoft.com> To: Andrea Campi <andrea+freebsd_current@webcom.it> Cc: freebsd-current@freebsd.org Subject: Re: panic: bad pte Message-ID: <20040415193930.B914@carver.gumbysoft.com> In-Reply-To: <20040411214300.GA10921@webcom.it> References: <20040411214300.GA10921@webcom.it>
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On Sun, 11 Apr 2004, Andrea Campi wrote: > Hi, > > I know this has been mentioned before on the list, and probably I should > know what to make of it, but still... > > I'm getting this panic from time to time (not easy to reproduce, no > apparent pattern): > > TPTE at 0xbfca06ec IS ZERO @ VA 281bb000 > panic: bad pte > at line 2558 in file /usr/src/sys/i386/i386/pmap.c > > > I was silly and just typed c so nothing more to work on I'm afraid. > Basically, what I'm asking is: what's it about? Is it hardware-related, > is it a know problem, or should I wait for it to happen again and look > into getting more details? A pte is a Page Table Entry and has to do with memory mapping. This particular panic is triggered when it discovers a page its trying to remove from a process doesn't appear to exist. This can be caused by bad memory corrupting the page tables, or it could be a bug. Someone wwhos familiar with the pagetable layout may want to investigate the given VA to see whats corrupted. That prson isn't me unfortunately :) Try to capture a crashdump and save it and the debugging kernel somewhere in case someone wants to look at it offline. -- Doug White | FreeBSD: The Power to Serve dwhite@gumbysoft.com | www.FreeBSD.org
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