Date: Sun, 4 Feb 1996 07:43:43 +1100 (EST) From: Douglas Thomas Crosher <dtc@scrooge.ee.swin.oz.au> To: freebsd-stable@freebsd.org Subject: Help: trap fault when swapping Message-ID: <199602032043.HAA07606@scrooge.ee.swin.oz.au>
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Every time I try running large lisp programs on my rather memory limit PC the freebsd kernels give me trouble. I not sure if it is my hardware that is perhaps picking up some errors in all the swapping or a kernel fault. I doubt it is a memory problem as the machine had been running well on jobs that worked the memory and processors hard and long, but without the swapping. I had been running current, but switched to stable to try and get my machine stable. So the OS is Freebsd-stable of last nights sup. But I've now got the following panic from the kernel on the last two attempts to get a result out of my job. -=-=- Fatal trap 12: page fault while in kernel mode fault virtual address = 0xdeadc10a ^^^^ quite an appropriate address I thought :) fault code = supervisor read, page not present instruction pointer = 0x8: 0xf011287c code segment = base 0x0, limit 0xfffff, type 0x1b = DPL 0, pres 1 def 32 1 gran 1 processor eflags = interrupt enabled, resume IOPL=0 current process = 13192 (top) interrupt mask = kernel: type 12 trap, code = 0 stopped at _sysctl_doproc + 0x64: cmp $0x1, 0x2c(%ebx) -=-=-=- I did a 'show map' and got: Task map 0xf011187c: pmap=0x12c7b80 ref=-1962934272 nentries=251658240 version=5 ^^^^^^^ is this a problem? mapentry 0xf0112923: start-0x5376000, end=0xfe95858d, prot=68/0/copy, wired,object-0x5350ffff, offset-0xa8e8. Then it had a Trap Fault 12... -=-=-= >From what I remember of the first panic it stopped with the same fault at _sysctl_doproc. The machine is a P90 with P/I-P55TP4 motherboard, 16M ram, and was swapping off two WD IDE hard disks. The lisp job was about 40M in size and was using mprotect to help reduce the garbage collection effort. The lisp program was over nfs if that is significant. If it is likely the hardward, do people have machines that really thrash with SCSI-2 busses with parity checking? Regards Douglas Crosher
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