Re: 2.4.23 hard lock, 100% reproducible.

Marcelo Tosatti
2003-12-07T14:50:52Z

The first oops looks like:

Unable to handle kernel NULL pointer
dereference at virtual address: 00000000

printing eip:
c02363dd
*pde=00000000
Oops: 0000
CPU: 0
EIP: 0010:[<c02363d>] Not tainted
EFLAGS: 00010217

eax: 00000006 ebx: 00000000 ecx: 7a01a8c0 ecx: c700b2a0
esi: c0299ce0 edi: 000001b7 ebp: c0299d94 esp: c0299c54
ds: 0018 es: 0018 ss: 0018

process: swapper (pid: 0, stackpage = c0299000)

Isnt it a bit weird that the full backtrace is not reported ?

wli suggests that might stack corruption.

I dont see any suspicious change around tcp_print_conntrack().

Any clues?

On Sun, 7 Dec 2003, Mark Symonds wrote:

>
> [...]
> >
> > addr2line requires compiling with -g. You can also do
> > ksymoops -m /path/to/your/System.map -A c02363dd
> > which does not require a recompile.
> >
>
> Excellent, this is alot easier. Should note that this
> kernel is compiled without support for loadable modules.
> Here goes:
>
> -------------
>
> puggy:/usr/src/linux/2.4.23# ksymoops -m ./System.map -A c02363dd
> ksymoops 2.4.9 on i686 2.4.23. Options used
> -V (default)
> -k /proc/ksyms (default)
> -l /proc/modules (default)
> -o /lib/modules/2.4.23/ (default)
> -m ./System.map (specified)
>
> Error (regular_file): read_ksyms stat /proc/ksyms failed
> ksymoops: No such file or directory
> No modules in ksyms, skipping objects
> No ksyms, skipping lsmod
>
>
> Adhoc c02363dd <tcp_print_conntrack+2d/60>
>
> 1 error issued. Results may not be reliable.
> puggy:/usr/src/linux/2.4.23#