Date: Sat, 08 Nov 1997 12:56:21 -0800 From: Julian Elischer <julian@whistle.com> To: Robert Eckardt <roberte@MEP.Ruhr-Uni-Bochum.de> Cc: dec@phoenix.its.rpi.edu, hackers@FreeBSD.ORG Subject: Re: Newest Pentium bug (fatal) Message-ID: <3464D1F5.2781E494@whistle.com> References: <199711081604.RAA00403@ghost.mep.ruhr-uni-bochum.de>
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Robert Eckardt wrote: > > > > Let denote "C" compilation with TC, > "1" a full crash (i.e. no reaction at all), > "0" Numlock and Ctrl-Alt-Del work, > "c" cold boot, > "w" warm boot. > Then I found the wollowing pattern: C 1 c 0 w 0 w... C 1 c 0 w 0 w > > It seems that it depends on what is in memory. > It crashed completely when I had used TC first. > That makes sense, as the bug involes the bus-lock operation The bus lock operation is invoked when a cache line of page TLB operation is enacted. If a page is laready lleaded, or already in the instruction-cache, then it may not need to do a lock operation.. (or maybe it's the other way around/.... if the page is NOT alreay loaded it's OK :? anyway.. you may find that if you add "0xc3" to the end, the '0' entries go away.
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