[user] segfault w/ error 4

[U.Mutlu]

[user question]

Hi,
recently a server daemon program suddenly started repeatedly crashing. syslog says:
  segfault at 7f6d003d5453 ip 00007f6d49c9dd6d sp 00007f6d469c1b60 error 4 in 
libstdc++.so.6.0.17[7f6d49bff000+e8000]

What does "error 4" mean? Is this documented somewhere?

Is this an application error or rather an error in libstdc++.so ?

The error is not always repeatable, ie. happens occasionally, reason unknown yet.

What's the easiest method to locate the bug in this server daemon pgm?

Thx