Date: Tue, 18 Jun 1996 08:16:00 +0200 (MET DST) From: Juergen Lock <nox@jelal.hb.north.de> To: davidg@Root.COM Cc: stable@freebsd.org Subject: Re: Trap 12/supervisor read, page not present Message-ID: <199606180616.IAA10166@saturn.hb.north.de> In-Reply-To: <199606171905.MAA00274@Root.COM>
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In article <199606171905.MAA00274@Root.COM> you write: >>Ok, I'm now getting detectable panics again (two panic/dumps, one >>mystery reboot). Seems like I've been switched to another common >>VM problem: "invalid kernel page directory". >> >>Here are the two panics and backtraces: >>kernel page directory invalid pdir=0x1beb023, va=0xefbfe000 >>panic: invalid kernel page directory >> >... >>#2 0xf0192c4b in pmap_enter (pmap=0xf121f46c, va=4022329344, pa=44859392, >> prot=7 '\a', wired=1) at ../../i386/i386/pmap.c:1184 >>#3 0xf017e2c5 in vm_fault (map=0xf121f400, vaddr=4022329344, >> fault_type=7 '\a', change_wiring=1) at ../../vm/vm_fault.c:840 >>#4 0xf017e4d4 in vm_fault_wire (map=0xf121f400, start=4022329344, >> end=4022337536) at ../../vm/vm_fault.c:919 >>#5 0xf0180b76 in vm_map_pageable (map=0xf121f400, start=4022329344, >> end=4022337536, new_pageable=0) at ../../vm/vm_map.c:1401 >>#6 0xf017eda6 in vm_fork (p1=0xf12ef100, p2=0xf1335600, isvfork=0) >> at ../../vm/vm_glue.c:227 >... > > Like I said, this is a "known" problem. What I don't understand is why you >see it happen so often. It takes literally *months* of heavy system activity >for me to reproduce this sometimes, which is why it has taken so long to fix >it. We'll be looking at this problem again this week, but I can give no Hmm. im not deep enough inside the vm code to take a guess whether it may be related or not but, i just made a new -stable kernel again (now ctm-cvs-cur 2130) and the hold count problem (kern/1195) is still there. system just booted, otherwise completely idle except for a few xterms and a xperfmon: after having written stables /usr/obj this time i have 21 of those (DIAGNOSTIC-panic-patched-into-printf, see PR) messages on the xconsole... find obj | afio -G 2 -o -v -f -b 5120 -c 1000 -s 100000x -Z /dev/nrst0 (this was the test. CPU 486dx100, tape Wangtek 525ES, PCI NCR SCSI.) ATB and sorry if this is old news and of no use Juergen PS: is the Root.COM a real address? i cant nslookup right now (still no flat rates in germany), therefore cc'd to the list...
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