This is a multi-part message in MIME format. --------------080204020206070201080405 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit

On 02.06.2009 12:28, jonathan@phillipoux.net wrote:

Full_Name: Jonathan Clarke Version: 2.3.43 OS: Solaris URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (213.41.243.192)

Hi,

I have a 2.3.43 running on a Solaris Sparc server, which crashes occasionally - once every week or two, always during the night. At this particular time a large number of operations are performed, including mass deletes and adds. I haven't been able to reproduce this bug, just watch it happen on the production server every now and again...

I managed to obtain a coredump, and a backtrace (at the end of this message). I realize this isn't much to go on, but I'm rather unfamiliar with this part of the code, so I wondered if anyone has an idea what's going on here?

FWIW, the dynlist and chain overlays are in use on the server, and the database is bdb, with a syncrepl consumer as well as syncprov overlay.

Backtrace follows: 8<------------------------------------------------------------- Thread 1 (process 1054014 ): #0 0xfee4aa58 in _lwp_kill () from /lib/libc.so.1 #1 0xfede5a64 in raise () from /lib/libc.so.1 #2 0xfedc1954 in abort () from /lib/libc.so.1 #3 0xfedc1b90 in _assert () from /lib/libc.so.1 #4 0xff30ef44 in ldap_pvt_runqueue_resched (rq=0x16c630, entry=0xee6c0a0, defer=0) at rq.c:165 #5 0xfe7f4a94 in syncprov_qstart (so=0x10acb540) at syncprov.c:933 #6 0xfe7f4d6c in syncprov_qresp (opc=0x1b1bfaf8, so=0x10acb540, mode=2) at syncprov.c:982 #7 0xfe7f5aa4 in syncprov_matchops (op=0xf6bffa50, opc=0x1b1bfaf8, saveit=0) at syncprov.c:1175 #8 0xfe7f7490 in syncprov_op_response (op=0xf6bffa50, rs=0xf6bff644) at syncprov.c:1561 #9 0x000575cc in ?? () #10 0x000575cc in ?? () 8<-------------------------------------------------------------

Thanks in advance for any pointers!

OK, I've spent some more time trying to understand this part of syncprov.c. From what I understand :

- the assert failure in ldap_pvt_runqueue_resched is caused by the fact syncprov_qstart is trying to "reschedule" a task that is no longer in the task_list - the only time the task is removed from the task_list (via ldap_pvt_runqueue_remove) is when the task is being run, in syncprov_qtask, if syncprov_qplay returns !=0 - the next time syncprov_qstart is called, it finds "so->s_qtask" is not NULL, and tries to reschedule the task, but it's no longer in the task_list.

I've written a patch that sets "so->s_qtask" to NULL in syncprov_qtask, just after removing the task from the task_list. So that when syncprov_qstart is called again, it goes into ldap_pvt_runqueue_insert... The patch is attached.

Unfortunately, I can't confirm it fixes the bug since I can't reproduce it... For those who understand the logic behind this, does this make any sense? :)

Regards, Jonathan