Date: Wed, 06 May 1998 00:50:02 -0500 From: Jacques Vidrine <n@nectar.com> To: freebsd-current@FreeBSD.ORG Subject: DEVFS/SLICE fatal trap 12 when reprobing scsi devices Message-ID: <199805060550.AAA00768@cerebus.nectar.com>
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Hello,
I routinely use ``scsi -f /dev/ssc -p'' to reprobe my SCSI
bus when I've switched cartridges in my Iomega jaz drive.
This has been working fine, but I decided to try out the
SLICE stuff today. It didn't work out, so I thought I'd
report.
Using -current as of about 11am CDT 1998/5/5, I enabled SLICE
and got the following fatal trap when using ``scsi -f /dev/ssc
-p'' (beware, copy-and-paste via actual paper):
*-----*
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x0
fault code = supervisor read, page not present
instruction pointer = 0x8:0xf0170811
stack pointer = 0x10:0xf440ed70
frame pointer = 0x10:0xf440eda0
code segment = base 0x0, limit 0xffffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 405 (scsi)
interrupt mask =
kernel: type 12 trap, code = 0
Stopped at _suopen+0xa5 movl 0(%eax),%eax
*-----*
``trace'' gave:
*-----*
_suopen(40400002, 3, 2000, f43bbc00, 3100) at _suopen+0xa5
_sscioctl(3100, 800c5108, f440eed4, 3, f43bbc00) at _sscioctl+0x69
_spec_ioctl(f440ee10, f40eea0, f01450ed, f440ee10, 0) at _spec_ioctl+0x44
_spec_vnoperate(f440ee10, 0, f0766900, 800c5108, 3) at _spec_vnoperate+0x15
_vn_ioctl(f0766900, 800c5108, f440eed4, f43bbc00, f43bbc00) at _vn_ioctl+0x111
_ioctl(f43bbc00, f440ef84) at _ioctl+0x2cf
_syscall(27, 27, efbfd928, efbfd948) at _syscall+0x127
_Xsyscall() at _Xsyscall+0x35
--- syscall 0x36, eip=0x10f25, esp=0xefbfd8e8, ebp=0xefbfd948---
*-----*
The trap happens only with ``option SLICE'' ... accessing ssc
through a devfs filesytem without ``option SLICE'' works just
as well as without devfs.
The jaz drive is the only SCSI device on the test system.
Jacques Vidrine <n@nectar.com>
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