Re: elfutls using assert

[Roland McGrath <roland@redhat.com>]

> Unless I'm mistaken, it isn't possible to attach the abort signal as it 
> may be sent to any thread?  

You are mistaken.  If you are catching the signal, you will catch all such
signals in whatever thread they are delivered.  Anyway, abort is equivalent
to raise (SIGABRT), which means synchronously to the calling thread (the
signal will appear to happen immediately after the syscall instruction for
the syscall that performs the "raise").

> Anyway, to make the problem more concrete, when a panic like this occurs,
> frysk needs time to pull all inserted breakpoints before detaching from
> the program and exiting.

Like I said, when one of these hits, you are lucky if all memory is not
randomly clobbered already.  But if you just avoid anything that would call
into elfutils libs at all, you might be avoiding the memory that is
definitely clobbered already, and be lucky enough to survive long enough to
withdraw gracefully.


Thanks,
Roland