Jeff Dike wrote:
 Thus I added SA_NOMASK to the flags for the handler.


This patch causes sleep to hang sometimes for me.  A sleep during
shutdown reproducably hangs, as does the sleep before a reboot after a
fsck found errors.

I had to track it down by bisection.  I'm somewhat mystified by this.
The only situation where this could cause a change in behavior is one
that shouldn't happen, as far as I can see.

But it's definitely the cause.  Pop the patch, the hangs go away, push
it, they come back.  I did this a couple times to be sure.

I'll debug this and figure out what's happening.

                                Jeff

Could you already find out what happens? On what subarch did you see the 
problem?
If I understand correctly, a sleep() done by a UML userspace-task hangs?

        Bodo


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