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SubjectRe: futex strangeness in 2.6.23-mm1/UML
Miklos Szeredi wrote:
>> I guess we can debug it in the old-fashioned ways. The first of which is
>> to palm the problem off on Pavel ;)

I look at the 2.6.23-mm1 and see that there's one hunk lost. This
is the one Oleg re-sent some days ago (the mail thread subject was
2.6.23-mm1 thread exit_group issue). Here it is (sent 13 oct 2007):

--- kernel/fork.c~ 2007-10-13 15:41:35.000000000 +0400
+++ kernel/fork.c 2007-10-13 15:41:41.000000000 +0400
@@ -1443,6 +1443,9 @@ long do_fork(unsigned long clone_flags,
task_pid_nr_ns(p, current->nsproxy->pid_ns) :
task_pid_vnr(p);

+ if (clone_flags & CLONE_PARENT_SETTID)
+ put_user(nr, parent_tidptr);
+
if (clone_flags & CLONE_VFORK) {
p->vfork_done = &vfork;
init_completion(&vfork);
Please, try with this patch.

>> I don't recall seeing a simple step-by-step way by which others can
>> reproduce this?
>
> My method is this:
>
> - enable CONFIG_FUSE_FS
> - compile fuse from CVS:
> cvs -d:pserver:anonymous@fuse.cvs.sourceforge.net:/cvsroot/fuse co -P fuse
> cd fuse
> ./makeconf.sh
> ./configure
> make
> make -C test
>
> - in one shell:
> mkdir /tmp/fuse
> example/fusexmp_fh -d /tmp/fuse
>
> - in another shell:
> mkdir /tmp/test
> test/test /tmp/fuse/tmp/test
>
> The result is normally a completed run with "1 tests failed". On
> 2.6.23-mm1, it just hangs after the first test.
>
> I've only tried under UML, but since Rick is seeing it on real HW, I
> guess this method may work there as well.
>
> Miklos
> -
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