Date: Sat, 10 May 1997 18:12:35 +1000 From: David Dawes <dawes@rf900.physics.usyd.edu.au> To: current@freebsd.org Subject: Panic with 2.2-STABLE when running an XFree86 dga app Message-ID: <19970510181235.54559@rf900.physics.usyd.edu.au>
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Last night my 2.2 machine (kernel from about 4 weeks ago) paniced when
exiting an XFree86 'dga' program. For those that don't know, 'dga' clients
mmap the video framebuffer directly rather than accessing it via the
Xserver. I'm guessing that the panic happened when it was unmapping the
framebuffer (the code doesn't explicitly call munmap() for this, it just
exits).
The panic message was:
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0xf3531ffd
fault code = supervisor write, page not present
instruction pointer = 0x8:0xf01ba717
stack pointer = 0x10:0xefbffed8
frame pointer = 0x10:0xefbffef4
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 = 9630 (tex)
interrupt mask =
panic: page fault
Symbols around 0xf01ba717 are:
f01ba648 T _pmap_protect
f01ba7ac T _pmap_enter
so I'd guess it paniced in pmap_protect.
If any further information is required, let me know.
David
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