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Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!msuinfo!agate!overload.lbl.gov!dog.ee.lbl.gov!ihnp4.ucsd.edu!news.service.uci.edu!nemesis.ps.uci.edu!bob From: bob@nemesis.ps.uci.edu (bob prohaska ) Newsgroups: comp.os.386bsd.questions Subject: panic during extract Date: 30 Apr 1994 03:11:31 GMT Organization: University of California, Irvine Lines: 59 Message-ID: <2psi93$anl@news.service.uci.edu> Reply-To: rprohask@uci.edu NNTP-Posting-Host: nemesis.ps.uci.edu Summary: Extract dies with a page fault Keywords: page fault kernel panic X-Newsreader: TIN [version 1.2 PL2] Hi all, Having got 1.1-gamma to run at 33 MHz on a vlb system (with lots of help!) I'm now trying to make the system work at 50 MHz and running into trouble: First of all, the system somtimes crashes on the second floppy install disk, usually while copying files to the hard disk. The only error message displayed so far was "out of swap space". That seems odd, given that the kernel already knows it has none! Eventually the machine got past that point and through all the reboots, whence a new problem developed: The system panics, reporting a page fault in kernel mode, usually while running extract: Fatal trap 12: page fault while in kernel mode fault virtual address = 0xf05df24c fault code = supervisor write, page not present instruction pointer = 0xf011b7ce processor eflags = interrupt enabled, resume, IOPL = 0 current process = 114 (tar) interrupt mask = none panic page fault Disks are synced successfully and a crash dump is saved. The machine came back up, ran for a while and now seems stuck after much disk activity, though the screen still scrolls. Restarted it thrashes the disk continuously during startup and seems stalled now on "starting network daemons.....inetd" The system is a 486DX-50, 16M RAM, OPTi 495slc chipset, 256k cache running with BIOS defaults on the motherboard. The disk controller is a bt445s rev.C, BIOS 4.72 Firmware 3.36 (BusLogic's tech support says this is latest). It's set for IRQ 12, DMA 5, I/O 330 I've tried turning off the secondary cache, slowing the system down with the turbo switch and low-level formatting the hard disk, a seagate st3600n. None fixes the problem, though the low level format seems to help the most. The trick described in the KNOWNBUGS file of turning switch 10 in block 2 off didn't seem to have any effect. Given that all seemed well at 33 MHz I'd like to think that this is a setup error on my part, but I've no idea what to look for. Experience suggests that OPTi chipsets were a poor choice for 1.0 but it seemed that 1.1 solved the problems. Now I'm not so sure. thanks for reading! bob