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slapd deadlocked in test008 (hdb) (ITS#2580)

To: openldap-its@OpenLDAP.org
Subject: slapd deadlocked in test008 (hdb) (ITS#2580)
From: h.b.furuseth@usit.uio.no
Date: Thu, 5 Jun 2003 20:20:57 GMT
Full_Name: Hallvard B Furuseth
Version: HEAD
OS: Solaris
URL: 
Submission from: (NULL) (129.240.186.42)
Submitted by: hallvard


Slapd is deadlocked in test008.
It is configured with
   ./configure --enable-aci --enable-crypt --enable-hdb
               --enable-bdb --enable-monitor --disable-debug
It's linked with the dmalloc library, beacuse I'm trying to
trace a coredump in malloc which only seems to happen when
I'm not using a malloc debugger:-(

Anyway, I'm keeping the process running for the time being,
in case someone wants me to debug it further.

Test output:

./scripts/test008-concurrency . hdb yes yes
running defines.sh
Datadir is ./data
Cleaning up in ./test-db...
Running slapadd to build slapd database...
Waiting 5 seconds for slapadd to build slapd database...
Starting slapd on TCP/IP port 9009...
Using ldapsearch to check that slapd is running...
Waiting 5 seconds for slapd to start...
Using tester for concurrent server access...
PID=1290 - Search(500): base="o=University of Michigan,c=US", filter="cn=Barbara
Jensen".
PID=1291 - Read(1000): entry="cn=Barbara Jensen, ou=Information Technology
Division, ou=People, o=University of Michigan, c=US".
PID=1292 - Modrdn(50): entry="cn=Dorothy Stevens,ou=Alumni
Association,ou=People,o=University of Michigan,c=US".
PID=1293 - Add/Delete(50): entry="cn=James A Jones 2,ou=Alumni
Association,ou=People,o=University of Michigan,c=US".
PID=1294 - Search(500): base="o=University of Michigan,c=US", filter="cn=Bjorn
Jensen".
PID=1295 - Read(1000): entry="cn=ITD Staff,ou=Groups,o=University of
Michigan,c=US".
PID=1302 - Search(500): base="o=University of Michigan,c=US", filter="PID=1298 -
Search(500): base="o=University of Michigan,c=US", filter="cn=James A Jones 1".
PID=1306 - Search(500): base="o=University of Michigan,c=US", filter="cn=Alumni
Assoc Staff".
PID=1300 - Modrdn(50): entry="cn=Ursula Hampster,ou=Alumni
Association,ou=People,o=University of Michigan,c=US".
cn=Bjorn Jensen".
PID=1303 - Read(1000): entry="ou=Alumni Association, ou=People, o=University of
Michigan, c=US".
PID=1307 - Read(1000): entry="cn=James A Jones 1, ou=Alumni Association,
ou=People, o=University of Michigan, c=US".
PID=1299 - Read(1000): entry="ou=Groups, o=University of Michigan, c=US".
PID=1296 - Modrdn(50): entry="cn=John Doe,ou=Information Technology
Division,ou=People,o=University of Michigan,c=US".
PID=1304 - Modrdn(50): entry="cn=James A Jones 2,ou=Information Technology
Division,ou=People,o=University of Michigan,c=US".
PID=1297 - Add/Delete(50): entry="cn=James A Jones 3,ou=Alumni
Association,ou=People,o=University of Michigan,c=US".
PID=1301 - Add/Delete(50): entry="cn=James A Jones 4,ou=People,o=University of
Michigan,c=US".
PID=1305 - Add/Delete(50): entry="cn=James A Jones 5,o=University of
Michigan,c=US".

Gdb backtrace:

bash$ gdb ../servers/slapd/slapd 1281
[Switching to Thread 4 (LWP 1)]
0xfef99ec4 in _poll () from /usr/lib/libc.so.1
(gdb) thread apply all bt

Thread 21 (Thread 16        ):
#0  0xfef9bd34 in _lwp_sema_wait () from /usr/lib/libc.so.1
#1  0xfeec9ab8 in _park () from /usr/lib/libthread.so.1
#2  0xfeec9780 in _swtch () from /usr/lib/libthread.so.1
#3  0xfeec8270 in cond_wait () from /usr/lib/libthread.so.1
#4  0xfeec811c in pthread_cond_wait () from /usr/lib/libthread.so.1
#5  0x00080cd0 in ldap_pvt_thread_cond_wait (cond=0x2654b0, mutex=0x265488)
    at thr_posix.c:254
#6  0x0007fb20 in ldap_pvt_thread_rdwr_wlock (rwlock=0x265488) at rdwr.c:245
#7  0x0006df0c in bdb_entryinfo_add_internal (bdb=0x1f5c08, ei=0xf80017f8, 
    res=0xf80017f4, locker=25) at cache.c:210
#8  0x0006e30c in hdb_cache_find_ndn (op=0xdba008, txn=0x0, ndn=0xdba030, 
    res=0xf80018bc, locker=25) at cache.c:367
#9  0x00070048 in hdb_dn2entry (op=0xdba008, tid=0x0, dn=0xdba030, 
    e=0xf8001938, matched=1, locker=25, lock=0xf8001940) at dn2entry.c:44
#10 0x000602a0 in hdb_referrals (op=0xdba008, rs=0xf8001ad8) at referral.c:46
#11 0x00036374 in backend_check_referrals (op=0xdba008, rs=0xf8001ad8)
    at backend.c:1110
#12 0x0003a610 in do_modrdn (op=0xdba008, rs=0xf8001ad8) at modrdn.c:298
#13 0x0002f490 in connection_operation (ctx=0xf8001b80, arg_v=0xdba008)
    at connection.c:963
#14 0x0008043c in ldap_int_thread_pool_wrapper (xpool=0x1e9a88) at tpool.c:463

Thread 20 (Thread 15        ):
#0  0xfeecb140 in _mutex_adaptive_lock () from /usr/lib/libthread.so.1
#1  0xfeecbbf8 in pthread_mutex_lock () from /usr/lib/libthread.so.1
#2  0x00080d10 in ldap_pvt_thread_mutex_lock (mutex=0x0) at thr_posix.c:288
#3  0x0006e354 in hdb_cache_find_ndn (op=0xdcb608, txn=0x0, ndn=0xdcb630, 
    res=0xf8741594, locker=24) at cache.c:386
#4  0x00070048 in hdb_dn2entry (op=0xdcb608, tid=0x0, dn=0xdcb630, 
    e=0xf8741638, matched=1, locker=24, lock=0xf8741650) at dn2entry.c:44
#5  0x00060ee4 in hdb_do_search (op=0xdcb608, rs=0xf8801ad8, sop=0xdcb608, 
    ps_e=0x0, ps_type=0) at search.c:510
#6  0x00060c8c in hdb_search (op=0xdcb608, rs=0xf8801ad8) at search.c:357
#7  0x000306a0 in do_search (op=0xdcb608, rs=0xf8801ad8) at search.c:395
#8  0x0002f544 in connection_operation (ctx=0xf8801b80, arg_v=0xdcb608)
    at connection.c:978
#9  0x0008043c in ldap_int_thread_pool_wrapper (xpool=0x1e9a88) at tpool.c:463

Thread 19 (Thread 14        ):
#0  0xfeecb140 in _mutex_adaptive_lock () from /usr/lib/libthread.so.1
#1  0xfeecbbf8 in pthread_mutex_lock () from /usr/lib/libthread.so.1
#2  0x00080d10 in ldap_pvt_thread_mutex_lock (mutex=0x0) at thr_posix.c:288
#3  0x0006e354 in hdb_cache_find_ndn (op=0xdcbc08, txn=0x0, ndn=0xdcbc30, 
    res=0xf8f41594, locker=23) at cache.c:386
#4  0x00070048 in hdb_dn2entry (op=0xdcbc08, tid=0x0, dn=0xdcbc30, 
    e=0xf8f41638, matched=1, locker=23, lock=0xf8f41650) at dn2entry.c:44
#5  0x00060ee4 in hdb_do_search (op=0xdcbc08, rs=0xf9001ad8, sop=0xdcbc08, 
    ps_e=0x0, ps_type=0) at search.c:510
#6  0x00060c8c in hdb_search (op=0xdcbc08, rs=0xf9001ad8) at search.c:357
#7  0x000306a0 in do_search (op=0xdcbc08, rs=0xf9001ad8) at search.c:395
#8  0x0002f544 in connection_operation (ctx=0xf9001b80, arg_v=0xdcbc08)
    at connection.c:978
#9  0x0008043c in ldap_int_thread_pool_wrapper (xpool=0x1e9a88) at tpool.c:463

Thread 18 (Thread 13        ):
#0  0xfeecb140 in _mutex_adaptive_lock () from /usr/lib/libthread.so.1
#1  0xfeecbbf8 in pthread_mutex_lock () from /usr/lib/libthread.so.1
#2  0x00080d10 in ldap_pvt_thread_mutex_lock (mutex=0x0) at thr_posix.c:288
#3  0x0006e6a8 in hdb_cache_find_id (op=0xdcb508, tid=0x0, id=4, 
    eip=0xf9741638, islocked=0, locker=22, lock=0xf9741650) at cache.c:531
#4  0x00061a74 in hdb_do_search (op=0xdcb508, rs=0xf9801ad8, sop=0xdcb508, 
    ps_e=0x0, ps_type=0) at search.c:904
#5  0x00060c8c in hdb_search (op=0xdcb508, rs=0xf9801ad8) at search.c:357
#6  0x000306a0 in do_search (op=0xdcb508, rs=0xf9801ad8) at search.c:395
#7  0x0002f544 in connection_operation (ctx=0xf9801b80, arg_v=0xdcb508)
    at connection.c:978
#8  0x0008043c in ldap_int_thread_pool_wrapper (xpool=0x1e9a88) at tpool.c:463

Thread 17 (Thread 12        ):
#0  0xfeec8268 in cond_wait () from /usr/lib/libthread.so.1
#1  0xfeec811c in pthread_cond_wait () from /usr/lib/libthread.so.1
#2  0x00080cd0 in ldap_pvt_thread_cond_wait (cond=0x2654b0, mutex=0x265488)
    at thr_posix.c:254
#3  0x0007fb20 in ldap_pvt_thread_rdwr_wlock (rwlock=0x265488) at rdwr.c:245
#4  0x0006df0c in bdb_entryinfo_add_internal (bdb=0x1f5c08, ei=0xfa0017f8, 
    res=0xfa0017f4, locker=21) at cache.c:210
#5  0x0006e30c in hdb_cache_find_ndn (op=0xdca008, txn=0x0, ndn=0xdca030, 
    res=0xfa0018bc, locker=21) at cache.c:367
#6  0x00070048 in hdb_dn2entry (op=0xdca008, tid=0x0, dn=0xdca030, 
    e=0xfa001938, matched=1, locker=21, lock=0xfa001940) at dn2entry.c:44
#7  0x000602a0 in hdb_referrals (op=0xdca008, rs=0xfa001ad8) at referral.c:46
#8  0x00036374 in backend_check_referrals (op=0xdca008, rs=0xfa001ad8)
    at backend.c:1110
#9  0x0003a610 in do_modrdn (op=0xdca008, rs=0xfa001ad8) at modrdn.c:298
#10 0x0002f490 in connection_operation (ctx=0xfa001b80, arg_v=0xdca008)
    at connection.c:963
#11 0x0008043c in ldap_int_thread_pool_wrapper (xpool=0x1e9a88) at tpool.c:463

Thread 16 (Thread 11        ):
#0  0xfeecb140 in _mutex_adaptive_lock () from /usr/lib/libthread.so.1
#1  0xfeecbbf8 in pthread_mutex_lock () from /usr/lib/libthread.so.1
#2  0x00080d10 in ldap_pvt_thread_mutex_lock (mutex=0x0) at thr_posix.c:288
#3  0x0006e354 in hdb_cache_find_ndn (op=0xdcbd08, txn=0x0, ndn=0xdcbd30, 
    res=0xfa8018bc, locker=19) at cache.c:386
#4  0x00070048 in hdb_dn2entry (op=0xdcbd08, tid=0x0, dn=0xdcbd30, 
    e=0xfa801938, matched=1, locker=19, lock=0xfa801940) at dn2entry.c:44
#5  0x000602a0 in hdb_referrals (op=0xdcbd08, rs=0xfa801ad8) at referral.c:46
#6  0x00036374 in backend_check_referrals (op=0xdcbd08, rs=0xfa801ad8)
    at backend.c:1110
#7  0x0003a610 in do_modrdn (op=0xdcbd08, rs=0xfa801ad8) at modrdn.c:298
#8  0x0002f490 in connection_operation (ctx=0xfa801b80, arg_v=0xdcbd08)
    at connection.c:963
#9  0x0008043c in ldap_int_thread_pool_wrapper (xpool=0x1e9a88) at tpool.c:463

Thread 15 (Thread 10        ):
#0  0xfeecb140 in _mutex_adaptive_lock () from /usr/lib/libthread.so.1
#1  0xfeecbbf8 in pthread_mutex_lock () from /usr/lib/libthread.so.1
#2  0x00080d10 in ldap_pvt_thread_mutex_lock (mutex=0x0) at thr_posix.c:288
#3  0x0006e6a8 in hdb_cache_find_id (op=0xdcbf08, tid=0x0, id=4, 
    eip=0xfaf41638, islocked=0, locker=18, lock=0xfaf41650) at cache.c:531
#4  0x00061a74 in hdb_do_search (op=0xdcbf08, rs=0xfb001ad8, sop=0xdcbf08, 
    ps_e=0x0, ps_type=0) at search.c:904
#5  0x00060c8c in hdb_search (op=0xdcbf08, rs=0xfb001ad8) at search.c:357
#6  0x000306a0 in do_search (op=0xdcbf08, rs=0xfb001ad8) at search.c:395
#7  0x0002f544 in connection_operation (ctx=0xfb001b80, arg_v=0xdcbf08)
    at connection.c:978
#8  0x0008043c in ldap_int_thread_pool_wrapper (xpool=0x1e9a88) at tpool.c:463

Thread 14 (Thread 9        ):
#0  0xfeecb140 in _mutex_adaptive_lock () from /usr/lib/libthread.so.1
#1  0xfeecbbf8 in pthread_mutex_lock () from /usr/lib/libthread.so.1
#2  0x00080d10 in ldap_pvt_thread_mutex_lock (mutex=0x0) at thr_posix.c:288
#3  0x0006e6a8 in hdb_cache_find_id (op=0xdcbe08, tid=0x0, id=4, 
    eip=0xfb741638, islocked=0, locker=17, lock=0xfb741650) at cache.c:531
#4  0x00061a74 in hdb_do_search (op=0xdcbe08, rs=0xfb801ad8, sop=0xdcbe08, 
    ps_e=0x0, ps_type=0) at search.c:904
#5  0x00060c8c in hdb_search (op=0xdcbe08, rs=0xfb801ad8) at search.c:357
#6  0x000306a0 in do_search (op=0xdcbe08, rs=0xfb801ad8) at search.c:395
#7  0x0002f544 in connection_operation (ctx=0xfb801b80, arg_v=0xdcbe08)
    at connection.c:978
#8  0x0008043c in ldap_int_thread_pool_wrapper (xpool=0x1e9a88) at tpool.c:463

Thread 13 (Thread 8        ):
#0  0xfeecb140 in _mutex_adaptive_lock () from /usr/lib/libthread.so.1
#1  0xfeecbbf8 in pthread_mutex_lock () from /usr/lib/libthread.so.1
#2  0x00080d10 in ldap_pvt_thread_mutex_lock (mutex=0x0) at thr_posix.c:288
#3  0x0006e6a8 in hdb_cache_find_id (op=0xdba108, tid=0x0, id=4, 
    eip=0xfbf41638, islocked=0, locker=16, lock=0xfbf41650) at cache.c:531
#4  0x00061a74 in hdb_do_search (op=0xdba108, rs=0xfc001ad8, sop=0xdba108, 
    ps_e=0x0, ps_type=0) at search.c:904
#5  0x00060c8c in hdb_search (op=0xdba108, rs=0xfc001ad8) at search.c:357
#6  0x000306a0 in do_search (op=0xdba108, rs=0xfc001ad8) at search.c:395
#7  0x0002f544 in connection_operation (ctx=0xfc001b80, arg_v=0xdba108)
    at connection.c:978
#8  0x0008043c in ldap_int_thread_pool_wrapper (xpool=0x1e9a88) at tpool.c:463

Thread 12 (Thread 7        ):
#0  0xfeecb140 in _mutex_adaptive_lock () from /usr/lib/libthread.so.1
#1  0xfeecbbf8 in pthread_mutex_lock () from /usr/lib/libthread.so.1
#2  0x00080d10 in ldap_pvt_thread_mutex_lock (mutex=0x0) at thr_posix.c:288
#3  0x0006e278 in hdb_cache_find_ndn (op=0x266b08, txn=0xdbfb88, 
    ndn=0xfc8019a0, res=0xfc801784, locker=2147483674) at cache.c:349
#4  0x0005f8c0 in hdb_modrdn (op=0x266b08, rs=0xfc801ad8) at modrdn.c:672
#5  0x0003a6d4 in do_modrdn (op=0x266b08, rs=0xfc801ad8) at modrdn.c:366
#6  0x0002f490 in connection_operation (ctx=0xfc801b80, arg_v=0x266b08)
    at connection.c:963
#7  0x0008043c in ldap_int_thread_pool_wrapper (xpool=0x1e9a88) at tpool.c:463

Thread 11 (Thread 6 (LWP 3)):
#0  0xfef9bce8 in ___lwp_cond_wait () from /usr/lib/libc.so.1
#1  0xfef932b0 in _lwp_cond_wait () from /usr/lib/libc.so.1
#2  0x000e6840 in __db_pthread_mutex_lock ()
#3  0x000c4624 in __lock_get_internal ()
#4  0x000c3b70 in __lock_get ()
#5  0x0006de5c in bdb_cache_entry_db_lock (env=0x1e3c08, locker=14, 
    ei=0xdbfd88, rw=1, tryOnly=0, lock=0xfd001838) at cache.c:104
#6  0x0006e78c in hdb_cache_find_id (op=0x266108, tid=0x0, id=4, 
    eip=0xfd0017b4, islocked=1, locker=14, lock=0xfd001838) at cache.c:567
#7  0x000700bc in hdb_dn2entry (op=0x266108, tid=0x0, dn=0x4, e=0xfd001830, 
    matched=1, locker=14, lock=0xfd001838) at dn2entry.c:52
#8  0x000602a0 in hdb_referrals (op=0x266108, rs=0xfd001ad8) at referral.c:46
#9  0x00036374 in backend_check_referrals (op=0x266108, rs=0xfd001ad8)
    at backend.c:1110
#10 0x00032710 in do_add (op=0x266108, rs=0xfd001ad8) at add.c:229
#11 0x0002f418 in connection_operation (ctx=0xfd001b80, arg_v=0x266108)
    at connection.c:953
#12 0x0008043c in ldap_int_thread_pool_wrapper (xpool=0x1e9a88) at tpool.c:463

Thread 10 (Thread 5        ):
#0  0xfeecb140 in _mutex_adaptive_lock () from /usr/lib/libthread.so.1
#1  0xfeecbbf8 in pthread_mutex_lock () from /usr/lib/libthread.so.1
#2  0x00080d10 in ldap_pvt_thread_mutex_lock (mutex=0x0) at thr_posix.c:288
#3  0x0006e6a8 in hdb_cache_find_id (op=0x267108, tid=0x0, id=4, 
    eip=0xfd741638, islocked=0, locker=12, lock=0xfd741650) at cache.c:531
#4  0x00061a74 in hdb_do_search (op=0x267108, rs=0xfd801ad8, sop=0x267108, 
    ps_e=0x0, ps_type=0) at search.c:904
#5  0x00060c8c in hdb_search (op=0x267108, rs=0xfd801ad8) at search.c:357
#6  0x000306a0 in do_search (op=0x267108, rs=0xfd801ad8) at search.c:395
#7  0x0002f544 in connection_operation (ctx=0xfd801b80, arg_v=0x267108)
    at connection.c:978
#8  0x0008043c in ldap_int_thread_pool_wrapper (xpool=0x1e9a88) at tpool.c:463

Thread 9 (Thread 3        ):
#0  0xfeecddb4 in _reap_wait () from /usr/lib/libthread.so.1
#1  0xfeecdb14 in _reaper () from /usr/lib/libthread.so.1

Thread 8 (Thread 2 (LWP 2)):
#0  0xfef9b684 in _signotifywait () from /usr/lib/libc.so.1
#1  0xfeeced54 in _dynamiclwps () from /usr/lib/libthread.so.1

Thread 7 (Thread 1        ):
#0  0xfeecde0c in _reap_wait_cancel () from /usr/lib/libthread.so.1
#1  0xfeed00a0 in _thrp_join () from /usr/lib/libthread.so.1
#2  0x00080c38 in ldap_pvt_thread_join (thread=4277071384, thread_return=0x4)
    at thr_posix.c:158
#3  0x0002e73c in slapd_daemon () at daemon.c:1993
#4  0x000291dc in main (argc=8, argv=0xffbef534) at main.c:579

Thread 6 (LWP    2        ):
#0  0xfef9b684 in _signotifywait () from /usr/lib/libc.so.1
#1  0xfeeced54 in _dynamiclwps () from /usr/lib/libthread.so.1

Thread 5 (LWP    3        ):
#0  0xfef9bce8 in ___lwp_cond_wait () from /usr/lib/libc.so.1
#1  0xfef932b0 in _lwp_cond_wait () from /usr/lib/libc.so.1
#2  0x000e6840 in __db_pthread_mutex_lock ()
#3  0x000c4624 in __lock_get_internal ()
#4  0x000c3b70 in __lock_get ()
#5  0x0006de5c in bdb_cache_entry_db_lock (env=0x1e3c08, locker=14, 
    ei=0xdbfd88, rw=1, tryOnly=0, lock=0xfd001838) at cache.c:104
#6  0x0006e78c in hdb_cache_find_id (op=0x266108, tid=0x0, id=4, 
    eip=0xfd0017b4, islocked=1, locker=14, lock=0xfd001838) at cache.c:567
#7  0x000700bc in hdb_dn2entry (op=0x266108, tid=0x0, dn=0x4, e=0xfd001830, 
    matched=1, locker=14, lock=0xfd001838) at dn2entry.c:52
#8  0x000602a0 in hdb_referrals (op=0x266108, rs=0xfd001ad8) at referral.c:46
#9  0x00036374 in backend_check_referrals (op=0x266108, rs=0xfd001ad8)
    at backend.c:1110
#10 0x00032710 in do_add (op=0x266108, rs=0xfd001ad8) at add.c:229
#11 0x0002f418 in connection_operation (ctx=0xfd001b80, arg_v=0x266108)
    at connection.c:953
#12 0x0008043c in ldap_int_thread_pool_wrapper (xpool=0x1e9a88) at tpool.c:463

Thread 4 (LWP    4        ):
#0  0xfef9bd34 in _lwp_sema_wait () from /usr/lib/libc.so.1
#1  0xfeec9ab8 in _park () from /usr/lib/libthread.so.1
#2  0xfeec9780 in _swtch () from /usr/lib/libthread.so.1
#3  0xfeec8270 in cond_wait () from /usr/lib/libthread.so.1
#4  0xfeec811c in pthread_cond_wait () from /usr/lib/libthread.so.1
#5  0x00080cd0 in ldap_pvt_thread_cond_wait (cond=0x2654b0, mutex=0x265488)
    at thr_posix.c:254
#6  0x0007fb20 in ldap_pvt_thread_rdwr_wlock (rwlock=0x265488) at rdwr.c:245
#7  0x0006df0c in bdb_entryinfo_add_internal (bdb=0x1f5c08, ei=0xf80017f8, 
    res=0xf80017f4, locker=25) at cache.c:210
#8  0x0006e30c in hdb_cache_find_ndn (op=0xdba008, txn=0x0, ndn=0xdba030, 
    res=0xf80018bc, locker=25) at cache.c:367
#9  0x00070048 in hdb_dn2entry (op=0xdba008, tid=0x0, dn=0xdba030, 
    e=0xf8001938, matched=1, locker=25, lock=0xf8001940) at dn2entry.c:44
#10 0x000602a0 in hdb_referrals (op=0xdba008, rs=0xf8001ad8) at referral.c:46
#11 0x00036374 in backend_check_referrals (op=0xdba008, rs=0xf8001ad8)
    at backend.c:1110
#12 0x0003a610 in do_modrdn (op=0xdba008, rs=0xf8001ad8) at modrdn.c:298
#13 0x0002f490 in connection_operation (ctx=0xf8001b80, arg_v=0xdba008)
    at connection.c:963
#14 0x0008043c in ldap_int_thread_pool_wrapper (xpool=0x1e9a88) at tpool.c:463

Thread 3 (LWP    5        ):
#0  0xfef99228 in door_restart () from /usr/lib/libc.so.1

Thread 2 (Thread 4 (LWP 1)):
#0  0xfef99ec4 in _poll () from /usr/lib/libc.so.1
#1  0xfef4ccac in select () from /usr/lib/libc.so.1
#2  0xfeedb0f4 in select () from /usr/lib/libthread.so.1

Thread 1 (LWP    1        ):
#0  0xfef99ec4 in _poll () from /usr/lib/libc.so.1
#1  0xfef4ccac in select () from /usr/lib/libc.so.1
#2  0xfeedb0f4 in select () from /usr/lib/libthread.so.1
#0  0xfef99ec4 in _poll () from /usr/lib/libc.so.1

(gdb) detach
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