Re: (ITS#5549) slapd SEGV faults in entry_partsize when monitoring

[ando@sys-net.it]

andreas.mueller@othello.ch wrote:
> Full_Name: Andreas Mueller
> Version: 2.4.9
> OS: Solaris 10
> URL: ftp://ftp.openldap.org/incoming/
> Submission from: (NULL) (193.134.170.35)
> 
> 
> We have four slapd servers in a mirrormode configuration.
> This generally works well. We monitor these servers using
> ldapsearches to cn=Monitor every minute, and collect
> performance data to construct load/performance graphs
> with rrdtool. Unfortunately, it sometimes happens that
> slapd crashes during the monitoring query. Using gdb, we
> were able to get a stack backtrace:
> 
> Core was generated by `/usr/local/libexec/slapd'.
> Program terminated with signal 11, Segmentation fault.
> #0  0x0005fd48 in entry_partsize ()
> (gdb) bt
> #0  0x0005fd48 in entry_partsize ()
> #1  0x000603b4 in entry_flatsize ()
> #2  0x0006a5c8 in slap_send_search_entry ()
> #3  0x00134330 in monitor_send_children ()
> #4  0x001348e0 in monitor_back_search ()
> #5  0x000523ac in fe_op_search ()
> #6  0x00051b64 in do_search ()
> #7  0x0004dd8c in connection_operation ()
> #8  0x0004e4c4 in connection_read_thread ()
> #9  0x001a22a8 in ldap_int_thread_pool_wrapper ()
> #10 0xfe3c5800 in __tbl_10_huge_digits () from /lib/libc.so.1
> 
> All cores obtained so far show that the segmentation fault
> occured at the same location inside entry_partsize.
> 
> Unfortunately we cannot systematically reproduce this behaviour,
> and we also cannot get the line number (binaries are stripped).
> 
> We have not tried other versions or other platforms. For production,
> we use the versions available in package form from www.sunfreeware.com,
> but the error also happens on servers we have compiled ourselves from
> the sources.

You should run a non-stripped binary, in order to allow more useful 
information to be extracted from those core files.

p.


Ing. Pierangelo Masarati
OpenLDAP Core Team

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