Ignoramus25565 <[EMAIL PROTECTED]> writes:
> Seems to work.
I've reproduced the crash when compiling "int main() { return 0; }"
on FC6 and running it on FC4.
The reason dynamic linker crashes is that a.out doesn't have
DT_HASH dynamic tag at all, and FC4 ld-linux.so.2 expects it (and
divides by l_nbuckets (zero) without checking):
#0 0x00991898 in dl_main (phdr=0x8048034, phnum=224, user_entry=0xbffff64c) at
rtld.c:1360
1360 for (symidx = main_map->l_buckets[0x6c994f %
main_map->l_nbuckets];
Compiling the same code on FC6 with '-Wl,--hash-style=sysv' fixes
that crash.
Still you are on dangerous ground -- your exe may have subtle
and non-trivial bugs introduced by "backward" compilation
environment. Let's hope you have adequate regression tests ...
> Also, interestingly, not only the app used to fail witi SIGFPE, but
> also "ldd app".
That's not surprising at all -- "ldd" is a simple shell script,
which tells ld-linux.so.2 to print libraries instead of actually
loading them. The root cause of the crash is the same in both cases:
missing DT_HASH dynamic tag.
Cheers,
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