Date: Wed, 06 Oct 1999 17:26:16 -0400 From: Simon Shapiro as Himself <shimon@simon-shapiro.org> To: stable@freebsd.org Subject: A panic, can anyone help? Message-ID: <37FBBE78.921F466A@simon-shapiro.org>
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In 3.3,
the following shell script:
for a in 1 2 3 4 5 6 7 8 9 0
do
dd if=/dev/some_disk of=/dev/null bs=128k count=16 skip=${a}00&
done
procudes:
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x8000000c
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc019c951
stack pointer = 0x10:0xda337e2c
frame pointer = 0x10:0xda337e7c
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 291 (dd)
interrupt mask =
kernel: type 12 trap, code=0
Stopped at spec_read+0xed: cmpb $0x7,0xc(%edx)
db> trace
spec_read(da337ec8,da2a4500,c11f62c0,da337f10,da337ea0) at spec_read+0xed
ufsspec_read(da337ec8,da337edc,c0197083,da337ec8,c11f62c0) at ufsspec_read+0x20
ufs_vnoperatespec(da337ec8,c11f62c0,20000,da2a6fa0,da2a4500) at ufs_vnoperatespec+0x15
vn_read(c11f62c0,da337f10,c11f5f80,0,da337f94) at vn_read+0x127
dofileread(da2a6fa0,c11f62c0,3,805d000,20000) at dofileread+0x8d
read(da2a6fa0,da337f94,bfbfd46c,6,bfbfd46c) at read+0x33
syscall(27,27,bfbfd46c,6,bfbfd434) at syscall+0x187
Xint0x80_syscall() at Xint0x80_syscall+0x2c
The calls do not even get to the device driver in question.
Any suggestion?
--
Sincerely Yours, Shimon@Simon-Shapiro.ORG
404.644.6401
Simon Shapiro
Unwritten code has no bugs and executes at twice the speed of mouth
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