Tim Sullivan wrote:
> 
> Hello,
> 
> The following occurred during startup using test12-pre3. test12-pre2
> does not exhibit the problem.
> 
> regards,
> 
> -tim
> 
> kernel: Unable to handle kernel paging request at virtual address
> fffffffc
> kernel:  printing eip:
> kernel: c011a41f
> kernel: *pde = 00001063
> kernel: *pte = 00000000
> kernel: Oops: 0000
> kernel: CPU:    0
> kernel: EIP:    0010:[sys_setitimer+191/208]
> kernel: EFLAGS: 00010246
> kernel: eax: 00000000   ebx: cf4e1fb0   ecx: 00000000   edx: c027169d
> kernel: esi: bffffc68   edi: cf4e1fc0   ebp: 00000000   esp: cf4e1f88
> kernel: ds: 0018   es: 0018   ss: 0018
> kernel: Process ntpdate (pid: 451, stackpage=cf4e1000)
> kernel: Stack: cf4e0000 bffffd1c 00000009 bffffc70 00000000 cf4e0000
> 400538e8 00000000
> kernel:        00000000 40166214 00000000 00030d40 00000000 000186a0
> c010a847 00000000
> kernel:        bffffc58 00000000 bffffd1c 00000009 bffffc70 00000068
> 0000002b 0000002b
> kernel: Call Trace: [system_call+51/56]
> kernel: Code: c8 5d 83 c4 28 c3 90 90 90 90 90 90 90 90 90 90 90 83 ec
> 44

Disassemblind the code bytes, it shows up as:
   0:   c8 5d 83 c4             enter  $0x835d,$0xc4
   4:   28 c3                   subb   %al,%bl
   6:   90                      nop
which is definately wrong.  Moving one byte forward it becomes:
   0:   5d                      popl   %ebp
   1:   83 c4 28                addl   $0x28,%esp
   4:   c3                      ret
   5:   90                      nop
which a normal sequence of instructions for the end of a function.  It
looks like a branch may have been miscompiled off by one.  What
compiler/binutils are you using?

--

				Brian Gerst
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