[Openmosix-devel] Looks like a bug to me... in 2.4 series

[Martin G. <mar...@gm...>]

Hi folks
   I've been trying to put OM into the current debian 2.4 kernel
and browsing the patches I am worried by the following code
fragments in openMosix-2.4.26-2 and its derivatives.

Watch the use of altfs/altgs

+++ hpc/mig.c
        /* restore segment registers.
           FIXME: do this only if remote modified LDT */
        loadsegment(gs, m->altgs);
        loadsegment(fs, m->altgs);

+++ hpc/service.c
        /* load segment registers
           FIXME: do this only if remote modified LDT */
        loadsegment(gs, p->mosix.altgs);
        loadsegment(fs, p->mosix.altfs);
...then later...
        /* load segment registers
           FIXME: do this only if remote modified LDT */
        loadsegment(gs, p->mosix.altgs);
        loadsegment(fs, p->mosix.altgs);

Does anyone know whether these are typoes from when the lines
were copied and pasted, or should altgs really be used for both
fs and gs? Up until 2.4.24-2, it's always "altgs" in both places,
then in 2.4.26-1 it appears as above: fs, altfs in one place only.

My symptoms are that simple tasks (infinite loops) distribute and
run ok, but complex ones get occational segfaults and other times
the kernel gets a NULL pointer dereference and hangs.

Any ideas?

    M