Re: Massive e2fs corruption with 2.2.9/10?

Horst von Brand (vonbrand@inf.utfsm.cl)
Sun, 20 Jun 1999 23:34:39 -0400


ron flory <rjflory@feist.com> said:

[...]

> It seems memcmp() is returning false miscompare status. If I use a
> for(){buf1[i] != buf2[i]} loop to scan the two read buffers after the
> memcmp() check, I find that the buffers are, in fact, identical. Now
> what ????

Compiler used? memcmp() used? Machine?

Note that the latest egcs snapshots by default enable optimizations based
on the assumption that only pointers to the same type can create aliases
(this according to ANSI C). The in-kernel mem* functions break this
assumption big time, probably other implementations do so too...

Try -fno-strict-aliasing

--
Dr. Horst H. von Brand                       mailto:vonbrand@inf.utfsm.cl
Departamento de Informatica                     Fono: +56 32 654431
Universidad Tecnica Federico Santa Maria              +56 32 654239
Casilla 110-V, Valparaiso, Chile                Fax:  +56 32 797513

- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/