On Tue, Jul 7, 2009 at 6:07 PM, John David
Anglin<dave@xxxxxxxxxxxxxxxxxx> wrote:
> I would guess that the loop terminated early because the l_info array
> is all zeros except for the first NEEDED entry. It appears correct. The
> loop might have terminated early because of a cache issue, or possibly
> the value loaded from memory somehow got corrupted. Another possibility
> would be the mmap operation wasn't complete when the memory was examined
> by the dynamic loader. When the core dump was done, the operation was
> complete.
>
> I think it's less likely that a cache issue affected the memory used by
> the dynamic loader (l_info field) as the data before and after in the
> map seemed reasonable.
>
> The fact PA8700 processors are also experiencing similar problems
> would seem to suggest that this isn't a PA8800 L2 issue unless we have
> multiple problems.
>
> I think we need to try running a recent kernel on gsyprf11 for a while
> to see if we can capture a similar event.
This rang a bell...
In glibc/elf/rtld.c we have this:
/* Partly clean the `bootstrap_map' structure up. Don't use
`memset' since it might not be built in or inlined and we cannot
make function calls at this point. Use '__builtin_memset' if we
know it is available. We do not have to clear the memory if we
do not have to use the temporary bootstrap_map. Global variables
are initialized to zero by default. */
#ifndef DONT_USE_BOOTSTRAP_MAP
# ifdef HAVE_BUILTIN_MEMSET
__builtin_memset (bootstrap_map.l_info, '\0', sizeof (bootstrap_map.l_info));
# else
for (size_t cnt = 0;
cnt < sizeof (bootstrap_map.l_info) / sizeof (bootstrap_map.l_info[0]);
++cnt)
bootstrap_map.l_info[cnt] = 0;
# endif
On hppa we don't have builtin memset (probably one of the few arches),
so we fall back on this weird loop which I always thought was wrong.
I was seeing problems with l_info having garbage in it, so I had a
local hack which cleared the entire bootstrap_map.
Did your l_info come from the bootstrap_map?
Cheers,
Carlos.
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