Date: Thu, 19 May 2005 14:13:07 +0200 From: Dirk Gouders <gouders@et.bocholt.fh-ge.de> To: freebsd-hackers@freebsd.org Subject: page fault in ugenpoll() Message-ID: <200505191213.j4JCD7pb000372@karga.hank.home>
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Hello,
on a machine
FreeBSD karga.hank.home 4.11-STABLE FreeBSD 4.11-STABLE #2: Thu May 19 12:32:50 CEST 2005 root@karga.hank.home:/usr/src/sys/compile/KARGA i386
I am playing with a Cryptoflex e-gate USB token and get kernel
panics when invoking a program openct-control to access it:
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x3
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc027177b
stack pointer = 0x10:0xccde7d40
frame pointer = 0x10:0xccde7d50
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 = 173 (ifdhandler)
interrupt mask = bio
trap number = 12
panic: page fault
The IP points to the following line in the function ugenpoll (line
1445 in ugen.c):
switch (sce->edesc->bmAttributes & UE_XFERTYPE)
Examining sce with gdb gives:
(kgdb) print sce
$1 = (struct ugen_endpoint *) 0x68c060
(kgdb) print sce->edesc
Cannot access memory at address 0x68c064.
(kgdb)
The software that I am trying to use might be erroneous, but I am
wondering that it causes kernel panics by accessing /dev/ugen0.
Dirk
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