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(ITS#7709) mdb back-end segfaults sporadically with paged searches
Full_Name: Semyon Chaichenets
OS: Linux 3.2.0-51-generic #77-Ubuntu SMP Wed Jul 24 20:18:19 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
Submission from: (NULL) (18.104.22.168)
We have an issue whereby a paged-search operation causes slapd to segfault. At
this point, I can only reproduce the issue on our production data - for which I
cannot share coredumps. I am working on isolating the issue but would appreciate
any help from openLDAP developers.
The issue is triggered by the following search:
ldapsearch -H ldap://ldaphost -b 'ou=people,dc=our,dc=org' -x -E pr=126/noprompt
We have ~59k entries starting matching uid=m*; the issue occurs unpredictably in
the sense that it may or may not happen for filters matching other sets, but it
can be reproduced reliably for any given filter/page size combination. On our
setup, I could reproduce it for page-sizes 81,84,87,96,112,114,116,126.
The issue is specific to back-mdb; backtrace points to dn2id.c:
#0 0x00007f6d6a5ea6a1 in mdb_idscopes (op=0x7f695c110df0, isc=0x7f69692ca670)
#1 0x00007f6d6a5e399b in mdb_search (op=0x7f695c110df0, rs=0x7f69692dba00)
I would greatly appreciate any help you could give me with this problem.