leo@yuriev.ru wrote:

Full_Name: Leonid Yuriev Version: 2.4.40 OS: RHEL7 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (31.130.36.33)

Currently there is a couple of backtraces only. This is the result of a stress test of replication in the presence of sync-conflicts after a "split brain" case. No any network troubles (just a loopback connections).

Looks like it's accessing freed memory, and it's also related to Abandon processing. You might be running into ITS#7967 as well. If you can reproduce this, try running with a malloc debugger.

** Signal 11 (Segmentation fault), address is 0x797a from 0x50e8bd (0) /opt/openldap.devel/libexec/slapd() [0x50e8bd]: syncprov_op_abandon /home/ly/Projects/openldap.git/servers/slapd/overlays/syncprov.c:1134 (1) /opt/openldap.devel/libexec/slapd() [0x48b31a]: overlay_op_walk /home/ly/Projects/openldap.git/servers/slapd/backover.c:662 (2) /opt/openldap.devel/libexec/slapd() [0x48b4c1]: over_op_func /home/ly/Projects/openldap.git/servers/slapd/backover.c:724 (3) /opt/openldap.devel/libexec/slapd() [0x4429a7]: fe_op_abandon /home/ly/Projects/openldap.git/servers/slapd/abandon.c:134 (discriminator 2) (4) /opt/openldap.devel/libexec/slapd() [0x42283c]: connection_abandon /home/ly/Projects/openldap.git/servers/slapd/connection.c:740 (discriminator 3) (5) /opt/openldap.devel/libexec/slapd() [0x424509]: connection_closing /home/ly/Projects/openldap.git/servers/slapd/connection.c:829 (6) /opt/openldap.devel/libexec/slapd() [0x4250ef]: connection_read /home/ly/Projects/openldap.git/servers/slapd/connection.c:1477 connection_read_thread /home/ly/Projects/openldap.git/servers/slapd/connection.c:1284 (7) /opt/openldap.devel/lib/libldap_r-2.4.so.2(+0x10cf2) [0x7f8c6de89cf2]: ??

*** Signal 11 (Segmentation fault), address is 0x7f7a1e1c5000 from 0x7f7a1eebfb54 (0) /lib/x86_64-linux-gnu/libc.so.6(+0x98b54) [0x7f7a1eebfb54]: ????:0 (1) /opt/openldap.devel/libexec/slapd() [0x4afa7d]: mdb_search /home/ly/Projects/openldap.git/servers/slapd/back-mdb/search.c:987 (discriminator 3) (2) /opt/openldap.devel/libexec/slapd() [0x48b356]: 543edda2 overlay_op_walk /home/ly/Projects/openldap.git/servers/slapd/backover.c:674 (3) /opt/openldap.devel/libexec/slapd() [0x48b4c1]: over_op_func /home/ly/Projects/openldap.git/servers/slapd/backover.c:724 (4) /opt/openldap.devel/libexec/slapd() [0x427201]: fe_op_search /home/ly/Projects/openldap.git/servers/slapd/search.c:402 (5) /opt/openldap.devel/libexec/slapd() [0x426c0c]: do_search /home/ly/Projects/openldap.git/servers/slapd/search.c:247 (6) /opt/openld.d.devel/libexec/slapd() [0x424b54]: connection_operation /home/ly/Projects/openldap.git/servers/slapd/connection.c:1158 (7) /opt/openldap.devel/libexec/slapd() [0x42526c]: connection_read_thread /home/ly/Projects/openldap.git/servers/slapd/connection.c:1291 (8) /opt/openldap.devel/lib/libldap_r-2.4.so.2(+0x10cf2) [0x7f7a1f629cf2]: ??