No subject

[Henry Cejtin]

Yes, your analysis is exactly what I remember about the alternate stack.

In  the cases where things fail, in the strace output, does the signal arrive
before or after the sigaltstack()?  In the code  I  have  tried  here,  which
shows no problems, the signal comes after the sigaltstack().

I  looked  at  the assembler dump for the profile signal catching stuff and I
don't see any thing weird.  I'm about the  get  the  sources  from  the  libc
sources.