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task slapd blocked for more than 120 seconds.

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:

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?