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SubjectRe: test12-pre3: paging problem
Brian Gerst wrote:
>
> 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


compiler = kgcc (RedHat 7)
gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)
binutils = 2.10.0.18

-tim
-
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