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Re: (ITS#5836) hung writers

To: openldap-its@OpenLDAP.org
Subject: Re: (ITS#5836) hung writers
From: quanah@OpenLDAP.org
Date: Sat, 29 Nov 2008 01:33:51 GMT

--On November 28, 2008 11:37:25 PM +0000 quanah@OpenLDAP.org wrote:


> Patch from Howard needs to be expanded so that a new keyword is used for
> the idle timer here, rather than the value from idletimeout.  This will
> require some reworking of the daemon to wake up for that interval as well.

After this patch, slapd can stay up, but seems to not be able to shut down. 
The threads show:

(gdb) thr apply all bt

Thread 4 (Thread 1082132832 (LWP 2205)):
#0  0x0000003fca9089ba in pthread_cond_wait@@GLIBC_2.3.2 () from 
/lib64/tls/libpthread.so.0
#1  0x0000002a956c8f58 in ldap_pvt_thread_cond_wait (cond=0x8a2f30, 
mutex=0x8a2f08) at thr_posix.c:299
#2  0x0000002a956c78e8 in ldap_pvt_thread_pool_destroy (tpool=0x617648, 
run_pending=1) at tpool.c:381
#3  0x0000000000429704 in slapd_daemon_task (ptr=0x0) at daemon.c:2516
#4  0x0000003fca90610a in start_thread () from /lib64/tls/libpthread.so.0
#5  0x0000003fca0c68c3 in clone () from /lib64/tls/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 3 (Thread 1115703648 (LWP 2209)):
#0  0x0000003fca90bd9c in __pread_nocancel () from 
/lib64/tls/libpthread.so.0
#1  0x0000002a97348edc in __os_io (dbenv=0xdc2100, op=1, fhp=0xf8d4d8, 
pgno=399474, pagesize=16384, buf=0x2ae8a1cc20 "Y,", niop=0x42681c30) at 
../dist/../os/os_rw.c:55
#2  0x0000002a973405ea in __memp_pgread (dbmfp=0xeab3c0, 
mutexp=0x2bb963f008, bhp=0x2ae8a1cb88, can_create=0) at 
../dist/../mp/mp_bh.c:219
#3  0x0000002a973413f7 in __memp_fget (dbmfp=0xeab3c0, pgnoaddr=0x42681d84, 
flags=0, addrp=0x42681d88) at ../dist/../mp/mp_fget.c:580
#4  0x0000002a972d18b3 in __bam_search (dbc=0xd2dc380, root_pgno=Variable 
"root_pgno" is not available.
) at ../dist/../btree/bt_search.c:307
#5  0x0000002a972c6e27 in __bam_c_search (dbc=0xd2dc380, root_pgno=0, 
key=0x42682050, flags=28, exactp=0x42681eb4) at 
../dist/../btree/bt_cursor.c:2547
#6  0x0000002a972c7b7e in __bam_c_get (dbc=0xd2dc380, key=0x42682050, 
data=0x42682030, flags=28, pgnop=0x42681f24) at 
../dist/../btree/bt_cursor.c:962
#7  0x0000002a9730f51b in __db_c_get (dbc_arg=0xd2dc1c0, key=0x42682050, 
data=0x42682030, flags=28) at ../dist/../db/db_cam.c:643
#8  0x0000002a973177d7 in __db_c_get_pp (dbc=0xd2dc1c0, key=0x42682050, 
data=0x42682030, flags=28) at ../dist/../db/db_iface.c:1836
#9  0x0000002a97184a16 in bdb_id2entry (be=0x42802a40, tid=0x0, locker=23, 
id=3443171, e=0x42682148) at id2entry.c:130
#10 0x0000002a97189e18 in bdb_cache_find_id (op=0x428025e0, tid=0x0, 
id=3443171, eip=0x42682310, islocked=0, locker=23, lock=0x42682250) at 
cache.c:714
#11 0x0000002a9717b1c7 in bdb_search (op=0x428025e0, rs=0x42802570) at 
search.c:696
#12 0x0000002a975921eb in syncprov_findcsn (op=0x5c1bc00, 
mode=FIND_PRESENT) at syncprov.c:681
#13 0x0000002a9759690a in syncprov_op_search (op=0x5c1bc00, rs=0x42803d60) 
at syncprov.c:2074
#14 0x000000000049b999 in overlay_op_walk (op=0x5c1bc00, rs=0x42803d60, 
which=op_search, oi=0xdec8c0, on=0xdec700) at backover.c:640
#15 0x000000000049bbf5 in over_op_func (op=0x5c1bc00, rs=0x42803d60, 
which=op_search) at backover.c:702
#16 0x000000000049bc8b in over_op_search (op=0x5c1bc00, rs=0x42803d60) at 
backover.c:724
#17 0x000000000042f23c in fe_op_search (op=0x5c1bc00, rs=0x42803d60) at 
search.c:355
#18 0x000000000042ed10 in do_search (op=0x5c1bc00, rs=0x42803d60) at 
search.c:217
#19 0x000000000042bdff in connection_operation (ctx=0x42803e90, 
arg_v=0x5c1bc00) at connection.c:1133
#20 0x000000000042c2ef in connection_read_thread (ctx=0x42803e90, 
argv=0x1e) at connection.c:1261
#21 0x0000002a956c7c77 in ldap_int_thread_pool_wrapper (xpool=0x8a2f00) at 
tpool.c:478
#22 0x0000003fca90610a in start_thread () from /lib64/tls/libpthread.so.0
#23 0x0000003fca0c68c3 in clone () from /lib64/tls/libc.so.6
#24 0x0000000000000000 in ?? ()

Thread 2 (Thread 1124096352 (LWP 2210)):
#0  bdb_idl_union (a=0xb3ff000, b=0xb1ff000) at idl.c:1151
#1  0x0000002a971829fc in inequality_candidates (op=0x5b11c00, 
ava=0x5a06518, ids=0xb3ff000, tmp=0xb1ff000, gtorlt=165) at 
filterindex.c:1063
#2  0x0000002a9717ff83 in bdb_filter_candidates (op=0x5b11c00, f=0x5a064f8, 
ids=0xb3ff000, tmp=0xb1ff000, stack=0xb4ff000) at filterindex.c:158
#3  0x0000002a97180595 in list_candidates (op=0x5b11c00, flist=0x5a064f8, 
ftype=160, ids=0xb2ff000, tmp=0xb1ff000, save=0xb3ff000) at 
filterindex.c:503
#4  0x0000002a97180213 in bdb_filter_candidates (op=0x5b11c00, f=0x5a064d8, 
ids=0xb2ff000, tmp=0xb1ff000, stack=0xb3ff000) at filterindex.c:183
#5  0x0000002a97180595 in list_candidates (op=0x5b11c00, flist=0x42e83670, 
ftype=160, ids=0x42f03970, tmp=0xb1ff000, save=0xb2ff000) at 
filterindex.c:503
#6  0x0000002a97180213 in bdb_filter_candidates (op=0x5b11c00, 
f=0x42e836d0, ids=0x42f03970, tmp=0xb1ff000, stack=0xb2ff000) at 
filterindex.c:183
#7  0x0000002a9717c2f1 in search_candidates (op=0x5b11c00, rs=0x43004d60, 
e=0x42e83910, locker=57, ids=0x42f03970, scopes=0x42e83970) at search.c:1124
#8  0x0000002a9717ad57 in bdb_search (op=0x5b11c00, rs=0x43004d60) at 
search.c:595
#9  0x000000000049ba2d in overlay_op_walk (op=0x5b11c00, rs=0x43004d60, 
which=op_search, oi=0xdece00, on=0x0) at backover.c:650
#10 0x000000000049bbf5 in over_op_func (op=0x5b11c00, rs=0x43004d60, 
which=op_search) at backover.c:702
#11 0x000000000049bc8b in over_op_search (op=0x5b11c00, rs=0x43004d60) at 
backover.c:724
#12 0x000000000042f23c in fe_op_search (op=0x5b11c00, rs=0x43004d60) at 
search.c:355
#13 0x000000000042ed10 in do_search (op=0x5b11c00, rs=0x43004d60) at 
search.c:217
#14 0x000000000042bdff in connection_operation (ctx=0x43004e90, 
arg_v=0x5b11c00) at connection.c:1133
#15 0x000000000042c2ef in connection_read_thread (ctx=0x43004e90, 
argv=0x19) at connection.c:1261
#16 0x0000002a956c7c77 in ldap_int_thread_pool_wrapper (xpool=0x8a2f00) at 
tpool.c:478
#17 0x0000003fca90610a in start_thread () from /lib64/tls/libpthread.so.0
#18 0x0000003fca0c68c3 in clone () from /lib64/tls/libc.so.6
#19 0x0000000000000000 in ?? ()

Thread 1 (Thread 182904263232 (LWP 2201)):
#0  0x0000003fca906ffb in pthread_join () from /lib64/tls/libpthread.so.0
#1  0x0000002a956c8eb0 in ldap_pvt_thread_join (thread=1082132832, 
thread_return=0x0) at thr_posix.c:193
#2  0x00000000004297d1 in slapd_daemon () at daemon.c:2581
#3  0x00000000004129d9 in main (argc=10, argv=0x7fbfffb918) at main.c:859

--Quanah
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