Date: Mon, 29 Nov 2004 23:56:11 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: David Gilbert <dgilbert@dclg.ca> Cc: Matt Emmerton <matt@gsicomp.on.ca> Subject: Re: isp driver not 64 bit? Message-ID: <20041130055611.GN5518@dan.emsphone.com> In-Reply-To: <16811.58127.759026.560570@canoe.dclg.ca> References: <16811.51043.987275.174410@canoe.dclg.ca> <003801c4d685$81192640$1200a8c0@gsicomp.on.ca> <16811.58127.759026.560570@canoe.dclg.ca>
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In the last episode (Nov 29), David Gilbert said: > Well... cam_calc_geometry seems to get called quite a bit. Almost > everytime you touch the disk, in fact. fsck'ing a partition calls > it, for instance. > > Console access is personally expensive (much driving, for instance), > but from memory the debugging I put in cam_calc_geometry() would > print before the correct output from dadone(). Your description > reminds me of this --- but it's no less vexing that the output from > dadone() has the correct sector and volume size and the ccg in > cam_calc_geometry() has bogus data. > > I don't know if it's significant, but the correct numbers were: > > 279353684 sectors of 512 bytes > > The ccg structure comes up with: > > 3737169375 sectors of 3737169374 bytes > > Not entirely sensible. Interesting that they're close values. > However, with different things on the stack, the values changed. Even more interesting is their hex values: DEC0ADDF and DEC0ADDE, aka 0xDEADC0DE. Something's reading memory after the kernel freed it. -- Dan Nelson dnelson@allantgroup.com
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