Nagios Support Forum

Oh, sorry about that:

The OS is Linux, 64-bit, SLES-9:

Linux CHQPVUL0888 2.6.5-7.267-smp #1 SMP Wed Jun 21 10:50:51 UTC 2006
x86_64 x86_64 x86_64 GNU/Linux

I grepped for "core" through the sysctl output, and found the following:

kernel.core_pattern = core
kernel.core_uses_pid = 0

But then I grepped for "suid" and found this more promising entry:

kernel.suid_dumpable = 0

Thanks for the quick reply Bill!

I hope changing this does the trick!

Bob

> In response to [email protected]:
>
>> Has anyone had problems obtaining core dumps from the main Nagios daemon
>> when it segfaults?
>>
>> I've enabled the option in the config file "daemon_dumps_core" but,
>> after
>> the daemon dies due to a segfault (confirmed via dmesg,) a core file
>> never
>> seems to be produced.
>>
>> And yes, I've set the global ulimit for core dumps to unlimited, and
>> yes,
>> there is enough space on my disk, and yes, I've scoured the disk with
>> "find" looking for files with the name of "core" or "core.", but to
>> no avail.
>>
>> I also completely disabled the segfault handling logic in the signal
>> handler, but nothing's changed.
>>
>> What am I missing here?
>>
>> I'm considering running nagios in the foreground (non-daemon mode) just
>> to
>> see if I can catch the magically-missing core file.
>
> What OS is this on?
>
> FreeBSD has sysctls that control how core dumps are handled, and can even
> disable them at the OS level. I assume that other POSIX systems have
> similar capabilities:
>
> $ sysctl -a | grep core
> kern.sugid_coredump: 0
> kern.coredump: 1
> kern.nodump_coredump: 0
> kern.corefile: %N.core
> $ sysctl -d kern.sugid_coredump
> kern.sugid_coredump: Enable coredumping set user/group ID processes
>
> Notice that the default in FreeBSD is to _not_ allow setu/gid programs to
> create core files ...
>
> --
> Bill Moran
> Collaborative Fusion Inc.
>
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Original poster: [email protected]