Re: 6.0-RC1 Panic

On Wednesday 12 October 2005 07:24 pm, Benjamin Close wrote:
> Hi All,
>     I can repeatedly get this panic at boot if I have my wi0 (802.11b
> Lucent / Hermes chipset) card in my laptop.
>
> Fatal trap 18: integer divide fault while in kernel mode
> instruction pointer     = 0x20:0xc06474fa
> stack pointer           = 0x28:0xd9927c78
> frame pointer           = 0x28:0xd9927c88
> 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         = 242 (netstat)
> trap number             = 18
> panic: integer divide fault
> Uptime: 3m32s
> Dumping 511 MB (2 chunks)
>   chunk 0: 1MB (159 pages) ... ok
>   chunk 1: 511MB (130794 pages) 495 479 463 447 431 415 399 383 367 351
> 335 319 303 287 271 255 239 223 207 191 175 159 143 127 111
>  95 79 63 47 31 15
>
> Full Details below...

Hmm, so it looks like maybe your ipfw.ko KLD doesn't have a DT_HASH section.  
Try doing an objdump of your ipfw.ko and see if it has a .hash.  Here's the 
objdump from the ipfw.ko on my laptop:

> objdump -h /boot/kernel.GENERIC/ipfw.ko | head

/boot/kernel.GENERIC/ipfw.ko:     file format elf32-i386-freebsd

Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .hash         00000348  00000094  00000094  00000094  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  1 .dynsym       000006f0  000003dc  000003dc  000003dc  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  2 .dynstr       00000439  00000acc  00000acc  00000acc  2**0

Note the .hash as the first section.

You can also try this patch which might fix the problem (though your ipfw.ko 
still won't load):

Index: kern/link_elf.c
===================================================================
RCS file: /usr/cvs/src/sys/kern/link_elf.c,v
retrieving revision 1.84
diff -u -r1.84 link_elf.c
--- kern/link_elf.c	28 Aug 2005 04:50:11 -0000	1.84
+++ kern/link_elf.c	14 Oct 2005 19:16:48 -0000
_at__at_ -1019,6 +1019,12 _at__at_
     unsigned long hash;
     int i;
 
+    /* If we don't have a hash, bail. */
+    if (ef->buckets == NULL || ef->nbuckets == 0) {
+	printf("link_elf_lookup_symbol: missing symbol hash table\n");
+	return ENOENT;
+    }
+
     /* First, search hashed global symbols */
     hash = elf_hash(name);
     symnum = ef->buckets[hash % ef->nbuckets];

-- 
John Baldwin <jhb_at_FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org