task slapd blocked for more than 120 seconds.

[ml+openldap@esmtp.org]

I'm trying some scenarios to see how syncrepl behaves in certain
error conditions. In one of these slapd blocks and is terminated(?)
(2.4.23 and 2.4.26, running on RH 5.5):

slapd         D ffff810002536420     0 21032      1         21037  4521 (NOTLB)
slapd         D ffff810002536420     0 21032      1         21037  4521 (NOTLB)
ffff810003f3fce8 0000000000000082 ffff81007eaae080 ffff81007faec100
000ec08328ac597e 0000000000000007 ffff81007eaae080 ffffffff80311b60
000ec0832bef5b8d 0000000000000990 ffff81007eaae268 0000000000000001
Call Trace:
[<ffffffff8006315f>] wait_for_completion+0x79/0xa2
[<ffffffff8008e430>] default_wake_function+0x0/0xe
[<ffffffff8004213e>] exit_mm+0x76/0xf5
[<ffffffff800158e6>] do_exit+0x305/0x965
[<ffffffff80049392>] cpuset_exit+0x0/0x88
[<ffffffff8002b42d>] get_signal_to_deliver+0x465/0x494
[<ffffffff8005af5e>] do_notify_resume+0x9c/0x7af
[<ffffffff8008e430>] default_wake_function+0x0/0xe
[<ffffffff80031545>] do_fork+0x148/0x1c1
[<ffffffff800a6061>] sys_futex+0x10a/0x12b
[<ffffffff8005d19f>] sysret_signal+0x1c/0x27
[<ffffffff8005d427>] ptregscall_common+0x67/0xac
INFO: task slapd:21037 blocked for more than 120 seconds.

How to reproduce:

Configuration:
one master with a push replica (see also ITS 6999).

On the replica:
stop slapd, clean out the database directory, set up the essential
files, start slapd.

On the master:
add a new entry to LDAP and run ldapsearch on that entry afterwards:
the command hangs.

ldap log entries for this:
conn=1002 fd=20 ACCEPT from PATH=/var/run/ldapi (PATH=/var/run/ldapi)
conn=1002 op=0 BIND dn="cn=Manager" method=128
conn=1002 op=0 BIND dn="cn=Manager" mech=SIMPLE ssf=0
conn=1002 op=0 RESULT tag=97 err=0 text=
conn=1002 op=1 ADD dn="uid=user2002,ou=People,dc=example,dc=com"
slap_queue_csn: queing 0x43224150 20110831224446.739440Z#000000#001#000000
syncprov_sendresp: cookie=rid=001,sid=001,csn=20110831224446.739440Z#000000#001#000000
do_syncrep2: rid=001 cookie=rid=001,sid=001,csn=20110831224446.739440Z#000000#001#000000
syncrepl_entry: rid=001 LDAP_RES_SEARCH_ENTRY(LDAP_SYNC_ADD)
conn=1002 op=2 UNBIND
conn=1002 op=1 RESULT tag=105 err=0 text=
slap_graduate_commit_csn: removing 0x2aaab0004160 20110831224446.739440Z#000000#001#000000
conn=1002 fd=20 closed
syncrepl_entry: rid=001 be_search (0)
syncrepl_entry: rid=001 uid=user2002,ou=People,dc=example,dc=com
slap_queue_csn: queing 0x5d4ea70 20110831224446.739440Z#000000#001#000000
syncrepl_entry: rid=001 be_add uid=user2002,ou=People,dc=example,dc=com (32)


Is this an error in slapd or in RH?