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provider crash on high replication load


I have the following problem:

On a sycrepl provider I have lots (100+) consumers in refresh and persist mode. After upgrading the provider from 2.3.x to 2.4.25 I can crash the server by a single mod on the root object of one database.

Aug 15 14:18:37 trzs721boot kernel: [544888.798212] slapd[2861]: segfault at 0 ip 00007fbf89494522 sp 00007fbe8cfa7ca0 error 4 in slapd[7fbf8942c000+1b6000]

I reproduced this on a test system, even with 2.4.26. The consumer are ldapsearch clients like this "-E!sync=rp/rid=xxx,csn= * +" on a single 2.4.25 machine. All SLES 11 SP1 64bit.

Here is the gbd output.


I tried to create a core dump, but I could not get it work.
I used this howto. The "top" example works, I get a core file for user ldap. With slapd it is not.

Why does slapd crash here?