[389-users] Segfault & Core Dumps

[Ulf Weltman]

  On 9/7/2010 8:25 AM, Dael Maselli wrote:
> Hi Rich,
>
> On 07/09/10 16.56, Rich Megginson wrote:
>> Do you see seg fault messages in /var/log/messages?
> Sure: ns-slapd[13737]: segfault at 00000000000000bc rip 0000003abb420375
> rsp 00000000580d85d0 error 4
>
>
>> The directory server dumps core in the log file directory, which by
>> default is /var/log/dirsrv/slapd-INSTANCE
> Yes, it is the same as working directory:
> # ls -l /proc/`pidof ns-slapd`/cwd
> lrwxrwxrwx 1 root root 0 Sep  7 17:12 /proc/18721/cwd ->
> /var/log/dirsrv/slapd-ds1
>
>
>> Is the crash easily reproducible?
> No, it isn't. It seems random, but I can simulate a crash with kill -QUIT.
>
> I tried killing a simple `sleep 10`:
>
> # ulimit -c unlimited
>
> # sleep 10&
> [1] 19726
>
> # kill -QUIT 19726
> [1]+  Quit                    (core dumped) sleep 10
>
> # ls -l core.*
> -rw------- 1 root root 290816 Aug 31 08:52 core.1008
>
> But if I kill -QUIT ns-slapd no file is created.
ns-slapd typically runs as setuid to a non-root user.  Check what 
fs.suid_dumpable or kernel.suid_dumpable are set to.
> Thanks,
> 	Dael Maselli.
>
>

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