Re: Snapshot 20040306: make hangs

[Rolf Campbell <Endlisnis at mailc dot net>]

Christopher Faylor wrote:
> If you want to analyze the strace yourself and offer comment, then
> please do so.  Sending strace snippets is normally useless.  99% of the
> time, people send the equivalent of a photo of an accident scene with
> the thought that the picture will show why the accident occurred, i.e.,
> the strace snippet is worthless.  I gave up trying to inspect
> unsolicited strace output a long time ago.
> cgf

I did notice one pattern after stairing blindly at strace output for a 
while.  Every time it freezes, there is a:

   43 4628798 [sig] make 2064 setup_handler: signal 20 not delivered
   47 4628845 [sig] make 2064 sigpacket::process: returning 0

very near the end of strace output (last 10 lines).  And on every 
successful run that I've looked at, I see:

   43 6057447 [sig] make 3768 setup_handler: signal 20 delivered
   41 6057488 [sig] make 3768 sigpacket::process: returning 1

in the last 150 lines of stace output.

What is signal 20 anyway?

I see it get 'not delivered' in the success runs too, but never so close 
to the end (1000's of lines up from the end).

-Rolf


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