From: Saku Ytti <saku@...>
Date: 2012-06-27T16:42:26+09:00
Subject: script hanging with looping SIGVTALRM calls

I have script which I run three times a day, it does heavily threaded
SNMP polls and populates SQL table.

I've ran it couple years now, and twice it has hanged and had to be
'kill -9' to recover, 'kill -1' did not recover. And I can't figure
out why it is hanging. When I truss the PID I get:

SIGNAL 26 (SIGVTALRM)
sigreturn(0xbfbfe6b0,0x1a,0x0,0xbfbfe6b0,0x0,0x280a78b0) = 1 (0x1)

In a loop, and very very rarely I see:

SIGNAL 26 (SIGVTALRM)
sigreturn(0xbfbfe6b0,0x1a,0x0,0xbfbfe6b0,0x0,0x280a78b0) ERR#1
'Operation not permitted'

I can provide script, if it'll help determine the problem. But I'd
rather provide it unicasted, if it isn't too much trouble.

Thanks,
-- 
  ++ytti