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Subject: Fatal trap 12: page fault while in kernel mode
Date: Fri, 21 Apr 1995 16:52:01 +0200
Message-Id: <25511.798475921@utis156.cs.utwente.nl>
From: Andras Olah <olah@cs.utwente.nl>
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I keep on getting these using a current kernel for about a week or
two.  The system usually panics when I use Netscape (and/or perhaps
tcpdump?) on it.  I'm not at all sure that it's really netscape,
just a guess.  A few days ago I made a make world on the machine
without any troubles.

Here's the panic message from the log and a stack trace.  The
machine is a 486/66MHz, 8MB mem, 340MB IDE system.  The system was
supped at Wed Apr 19 05:01:02 1995 and I recompiled everything.

Does anybody have a clue?

Andras

Apr 21 16:03:54 utip007 /kernel: 
Apr 21 16:03:54 utip007 /kernel: 
Apr 21 16:03:54 utip007 /kernel: Fatal trap 12: page fault while in kernel mode
Apr 21 16:03:55 utip007 /kernel: fault virtual address  = 0xf037d0fa
Apr 21 16:03:55 utip007 /kernel: fault code             = supervisor write, page not present
Apr 21 16:03:55 utip007 /kernel: instruction pointer    = 0x8:0xf016992d
Apr 21 16:03:55 utip007 /kernel: code segment           = base 0x0, limit 0xfffff, type 0x1b
Apr 21 16:03:55 utip007 /kernel:                        = DPL 0, pres 1, def32 1, gran 1
Apr 21 16:03:55 utip007 /kernel: processor eflags       = interrupt enabled, resume, IOPL = 0
Apr 21 16:03:55 utip007 /kernel: current process        = 256 (netscape)
Apr 21 16:03:55 utip007 /kernel: interrupt mask         = net 
Apr 21 16:03:55 utip007 /kernel: panic: from debugger
Apr 21 16:03:55 utip007 /kernel: 

(kgdb) bt
#0  0xf0165ff8 in boot ()
#1  0xf0113175 in panic ()
#2  0xf010123d in db_panic ()
#3  0xf0101126 in db_command (-266851596, -266852012, -267382206)
#4  0xf01012a5 in db_command_loop ()
#5  0xf0103c28 in db_trap ()
#6  0xf016328a in kdb_trap (12, 0, -272630724, -266949882)
#7  0xf016ad97 in trap_fatal ()
#8  0xf016a914 in trap_pfault ()
#9  0xf016a5a3 in trap ()
#10 0xf0163b31 in exception:calltrap (-266750324, -267546876, -264790014, 65535)
#11 0xf01721c4 in if_ed:ed_get_packet ()
#12 0xf0171d5a in edintr ()
#13 0xf0164a1d in exception:Xresume9 ()
#14 0xf013eeae in ip_output (-263761152, 0, -263767636, 0, 0)
#15 0xf0143626 in tcp_output ()
#16 0xf014445e in tcp_usrreq ()
#17 0xf011cc92 in sosend ()
#18 0xf0115435 in soo_write ()
#19 0xf01144ff in write ()
#20 0xf016b005 in syscall ()
(kgdb)