[user] segfault w/ error 4

[U.Mutlu]

U.Mutlu wrote, On 09/11/2012 07:06 AM:
> [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

Additional info:

The error happens only with the 64-bit version of the system library on multicore systems (amd64).
On 32bit-multicore-systems the error doesn't happen.