Date: Sat, 7 Jan 1995 03:15:16 -0600 (CST) From: joeg@wwa.com (joe grosch) To: hackers@freebsd.org Subject: page fault while in kernel mode Message-ID: <m0rQXEz-000FDmC@gagme.wwa.com>
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Well,
I've recompiled the kernel with kernel debug options and now have the
problem to the point that I can consistently reproduce this problem.
I start a tar listing of a tape and push it into the background ie.
tar tvf /dev/rwt0 > tape.list &
I then start up emacs and crank up gdb under emacs. gdb starts up fine
altho I can hear that the disk is VERY busy. As soon as try to run the program
inside gdb I get a page fault. I get dropped into the kernel debugger.
I am not very good with the kernel debugger but I do a trace and the debugger
tells me the following;
_pmap_enter( ... )
_vm_fault( ... )
_pwrite( ... )
_ptrace( ... )
_syscall( ... )
Has anyone else gotten to this point? Have I stumbled over an old bug?
or is this a new bug. My source is WC's CDROM (FreeBSD2.0). My system is a
386SX40 with 4 meg of memory, a one gig SCSI disk with 50 meg of swap.
I'll write up a more complete discription of the results of the kernel debug
session tomorrow (It's 3am).
Josef
--
__/\__ | Josef Grosch | "It's been a quiet week in Lake
\ / | (708) 291-9076 | Wobegon, my home town..."
/_ _\ | |
\/ | joeg@wwa.com | -Prairie Home Companion
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