Re: Hang on latest kubuntu linux when built with icc

[Peter Stephenson <pws@csr.com>]

"Vin Shelton" wrote:
> when I build the latest CVS sources with icc, the Intel C compiler,
> the shell eventually hangs after running a command but before
> returning to the prompt.  It usually takes only 1-5 commands before
> this happens.
> 
> Here's an strace of zsh -f:
>... 
> wait4(-1, 0xbfd3ac30, WNOHANG|WSTOPPED, 0xbfd3abd4) = -1 ECHILD (No
> child processes)
> sigreturn()                             = ? (mask now ~[HUP KILL CHLD
> STOP RTMIN])
> pause()                                 = ? ERESTARTNOHAND (To be restarted)
> --- SIGHUP (Hangup) @ 0 (0) ---
>...
> The SIGHUP is where I killed the shell from another window.

Unfortunately I'm not a signal expert and it really needs someone who
does this sort of thing regularly.

The pause() looks a bit fishy.  There are two explicit occurrences in
the code:  I'll assume it's one of these for now.  What strace
reports might be only distantly related to the source code; still, my
Fedora Core 4 with 2.6.14 says it's calling rt_sigsuspend(), which
sounds much more plausible.

One call is here:

#ifdef BROKEN_POSIX_SIGSUSPEND
    sigprocmask(SIG_SETMASK, &set, &oset);
    pause();
    sigprocmask(SIG_SETMASK, &oset, NULL);
#else /* not BROKEN_POSIX_SIGSUSPEND */
    ret = sigsuspend(&set);
#endif /* BROKEN_POSIX_SIGSUSPEND */

and the other is right down at the tail end where we're virtually
implementing signal suspension from scratch.

I don't think you should be getting either of those... certainly not the
second, but probably not BROKEN_POSIX_SIGSUSPEND either.  Could you
check if that's defined?  If it is, try undefining it; the test may need
tweaking.

-- 
Peter Stephenson <pws@csr.com>                  Software Engineer
CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
Cambridge, CB4 0WZ, UK                          Tel: +44 (0)1223 692070


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