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Re: RE24 connection code round 2

To: Howard Chu <hyc@symas.com>
Subject: Re: RE24 connection code round 2
From: Michael StrÃder <michael@stroeder.com>
Date: Thu, 29 Jan 2009 19:22:59 +0100
Cc: openldap-devel@openldap.org
In-reply-to: <4981BB8D.8010805@symas.com>
References: <24791730.331233152443814.JavaMail.root@mail> <49807355.3000803@stroeder.com> <49807AE1.20108@stroeder.com> <AF9C19D2EBC4052FCCD7685A@STONEKING-LM.CORP.YAHOO.COM> <4981A198.7080007@stroeder.com> <4981BB8D.8010805@symas.com>
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.19) Gecko/20081204 SeaMonkey/1.1.14

Howard Chu wrote:
> Michael StrÃder wrote:
>> Now gdb backtrace of hanging test008 with HEAD and compiled with only
>> -O2:
> 
> OK, please try current HEAD again. It's reverted to the original epoll
> behavior (level-triggered) so this type of problem can no longer occur.
> Also I've found that setting the descriptor to edge-triggered
> after-the-fact works, so it still prevents the endless hangup reports
> from happening.

There was only a change to servers/slapd/daemon.c. Is that right?
Still I see hangs in test008 with HEAD.

Ciao, Michael.

Thread 18 (Thread 0xb7641b90 (LWP 15588)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7a24c26 in epoll_wait () from /lib/libc.so.6
#2  0x0806617f in slapd_daemon_task (ptr=0x0) at daemon.c:2291
#3  0xb7cff1b5 in start_thread () from /lib/libpthread.so.0
#4  0xb7a2438e in clone () from /lib/libc.so.6

Thread 17 (Thread 0xb7240b90 (LWP 15589)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7d057b9 in __lll_lock_wait () from /lib/libpthread.so.0
#2  0xb7d00cd1 in _L_lock_89 () from /lib/libpthread.so.0
#3  0xb7d005b2 in pthread_mutex_lock () from /lib/libpthread.so.0
#4  0xb7efaffd in ldap_pvt_thread_mutex_lock (mutex=0x837a5f8) at
thr_posix.c:296
#5  0x0815f2cc in monitor_cache_lock (e=0x835f3bc) at cache.c:117
#6  0x0810b1a5 in monitor_send_children (op=0x837d338, rs=0xb72400c8,
e_parent=<value optimized out>, sub=1) at search.c:144
#7  0x0810b21c in monitor_send_children (op=0x837d338, rs=0xb72400c8,
e_parent=<value optimized out>, sub=1) at search.c:123
#8  0x0810b62d in monitor_back_search (op=0x837d338, rs=0xb72400c8) at
search.c:245
#9  0x0806bbc3 in fe_op_search (op=0x837d338, rs=0xb72400c8) at search.c:366
#10 0x0806c438 in do_search (op=0x837d338, rs=0xb72400c8) at search.c:217
#11 0x0806970b in connection_operation (ctx=0xb72401cc, arg_v=0x837d338)
at connection.c:1100
#12 0x0806a167 in connection_read_thread (ctx=0xb72401cc, argv=0x1c) at
connection.c:1226
#13 0xb7efa400 in ldap_int_thread_pool_wrapper (xpool=0x82ba4d8) at
tpool.c:663
#14 0xb7cff1b5 in start_thread () from /lib/libpthread.so.0
#15 0xb7a2438e in clone () from /lib/libc.so.6

Thread 16 (Thread 0xb653db90 (LWP 15716)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7d02c35 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/libpthread.so.0
#2  0xb7efb094 in ldap_pvt_thread_cond_wait (cond=0x82ba4f4,
mutex=0x82ba4dc) at thr_posix.c:277
#3  0xb7efa472 in ldap_int_thread_pool_wrapper (xpool=0x82ba4d8) at
tpool.c:654
#4  0xb7cff1b5 in start_thread () from /lib/libpthread.so.0
#5  0xb7a2438e in clone () from /lib/libc.so.6

Thread 15 (Thread 0xb583ab90 (LWP 15736)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7d02c35 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/libpthread.so.0
#2  0xb7efb094 in ldap_pvt_thread_cond_wait (cond=0x82ba4f4,
mutex=0x82ba4dc) at thr_posix.c:277
#3  0xb7efa472 in ldap_int_thread_pool_wrapper (xpool=0x82ba4d8) at
tpool.c:654
#4  0xb7cff1b5 in start_thread () from /lib/libpthread.so.0
#5  0xb7a2438e in clone () from /lib/libc.so.6

Thread 14 (Thread 0xb4b37b90 (LWP 15757)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7d057b9 in __lll_lock_wait () from /lib/libpthread.so.0
#2  0xb7d00cd1 in _L_lock_89 () from /lib/libpthread.so.0
#3  0xb7d005b2 in pthread_mutex_lock () from /lib/libpthread.so.0
#4  0xb7efaffd in ldap_pvt_thread_mutex_lock (mutex=0x837a5f8) at
thr_posix.c:296
#5  0x0815f2cc in monitor_cache_lock (e=0x835f3bc) at cache.c:117
#6  0x0810b1a5 in monitor_send_children (op=0x8385510, rs=0xb4b370c8,
e_parent=<value optimized out>, sub=1) at search.c:144
#7  0x0810b21c in monitor_send_children (op=0x8385510, rs=0xb4b370c8,
e_parent=<value optimized out>, sub=1) at search.c:123
#8  0x0810b62d in monitor_back_search (op=0x8385510, rs=0xb4b370c8) at
search.c:245
#9  0x0806bbc3 in fe_op_search (op=0x8385510, rs=0xb4b370c8) at search.c:366
#10 0x0806c438 in do_search (op=0x8385510, rs=0xb4b370c8) at search.c:217
#11 0x0806970b in connection_operation (ctx=0xb4b371cc, arg_v=0x8385510)
at connection.c:1100
#12 0x0806a167 in connection_read_thread (ctx=0xb4b371cc, argv=0x14) at
connection.c:1226
#13 0xb7efa400 in ldap_int_thread_pool_wrapper (xpool=0x82ba4d8) at
tpool.c:663
#14 0xb7cff1b5 in start_thread () from /lib/libpthread.so.0
#15 0xb7a2438e in clone () from /lib/libc.so.6

Thread 13 (Thread 0xb4635b90 (LWP 15775)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7d02c35 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/libpthread.so.0
#2  0xb7efb094 in ldap_pvt_thread_cond_wait (cond=0x82ba4f4,
mutex=0x82ba4dc) at thr_posix.c:277
#3  0xb7efa472 in ldap_int_thread_pool_wrapper (xpool=0x82ba4d8) at
tpool.c:654
#4  0xb7cff1b5 in start_thread () from /lib/libpthread.so.0
#5  0xb7a2438e in clone () from /lib/libc.so.6

Thread 12 (Thread 0xb3932b90 (LWP 15776)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7d057b9 in __lll_lock_wait () from /lib/libpthread.so.0
#2  0xb7d00cd1 in _L_lock_89 () from /lib/libpthread.so.0
#3  0xb7d005b2 in pthread_mutex_lock () from /lib/libpthread.so.0
#4  0xb7efaffd in ldap_pvt_thread_mutex_lock (mutex=0x837a5f8) at
thr_posix.c:296
#5  0x0815f2cc in monitor_cache_lock (e=0x835f3bc) at cache.c:117
#6  0x0810b1a5 in monitor_send_children (op=0x838a7c0, rs=0xb39320c8,
e_parent=<value optimized out>, sub=1) at search.c:144
#7  0x0810b21c in monitor_send_children (op=0x838a7c0, rs=0xb39320c8,
e_parent=<value optimized out>, sub=1) at search.c:123
#8  0x0810b62d in monitor_back_search (op=0x838a7c0, rs=0xb39320c8) at
search.c:245
#9  0x0806bbc3 in fe_op_search (op=0x838a7c0, rs=0xb39320c8) at search.c:366
#10 0x0806c438 in do_search (op=0x838a7c0, rs=0xb39320c8) at search.c:217
#11 0x0806970b in connection_operation (ctx=0xb39321cc, arg_v=0x838a7c0)
at connection.c:1100
#12 0x0806a167 in connection_read_thread (ctx=0xb39321cc, argv=0x22) at
connection.c:1226
#13 0xb7efa400 in ldap_int_thread_pool_wrapper (xpool=0x82ba4d8) at
tpool.c:663
#14 0xb7cff1b5 in start_thread () from /lib/libpthread.so.0
#15 0xb7a2438e in clone () from /lib/libc.so.6

Thread 11 (Thread 0xb3430b90 (LWP 15781)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7d02c35 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/libpthread.so.0
#2  0xb7efb094 in ldap_pvt_thread_cond_wait (cond=0x82ba4f4,
mutex=0x82ba4dc) at thr_posix.c:277
#3  0xb7efa472 in ldap_int_thread_pool_wrapper (xpool=0x82ba4d8) at
tpool.c:654
#4  0xb7cff1b5 in start_thread () from /lib/libpthread.so.0
#5  0xb7a2438e in clone () from /lib/libc.so.6

Thread 10 (Thread 0xb272db90 (LWP 15824)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7d02c35 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/libpthread.so.0
#2  0xb7efb094 in ldap_pvt_thread_cond_wait (cond=0x82ba4f4,
mutex=0x82ba4dc) at thr_posix.c:277
#3  0xb7efa472 in ldap_int_thread_pool_wrapper (xpool=0x82ba4d8) at
tpool.c:654
#4  0xb7cff1b5 in start_thread () from /lib/libpthread.so.0
#5  0xb7a2438e in clone () from /lib/libc.so.6

Thread 9 (Thread 0xb1229b90 (LWP 15841)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7d02c35 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/libpthread.so.0
#2  0xb7efb094 in ldap_pvt_thread_cond_wait (cond=0x82ba4f4,
mutex=0x82ba4dc) at thr_posix.c:277
#3  0xb7efa472 in ldap_int_thread_pool_wrapper (xpool=0x82ba4d8) at
tpool.c:654
#4  0xb7cff1b5 in start_thread () from /lib/libpthread.so.0
#5  0xb7a2438e in clone () from /lib/libc.so.6

Thread 8 (Thread 0xb0e28b90 (LWP 15854)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7d02c35 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/libpthread.so.0
#2  0xb7efb094 in ldap_pvt_thread_cond_wait (cond=0x82ba4f4,
mutex=0x82ba4dc) at thr_posix.c:277
#3  0xb7efa472 in ldap_int_thread_pool_wrapper (xpool=0x82ba4d8) at
tpool.c:654
#4  0xb7cff1b5 in start_thread () from /lib/libpthread.so.0
#5  0xb7a2438e in clone () from /lib/libc.so.6

Thread 7 (Thread 0xb0825b90 (LWP 15857)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7d02c35 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/libpthread.so.0
#2  0xb7efb094 in ldap_pvt_thread_cond_wait (cond=0x82ba4f4,
mutex=0x82ba4dc) at thr_posix.c:277
#3  0xb7efa472 in ldap_int_thread_pool_wrapper (xpool=0x82ba4d8) at
tpool.c:654
#4  0xb7cff1b5 in start_thread () from /lib/libpthread.so.0
#5  0xb7a2438e in clone () from /lib/libc.so.6

Thread 6 (Thread 0xafb22b90 (LWP 15873)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7d02c35 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/libpthread.so.0
#2  0xb7efb094 in ldap_pvt_thread_cond_wait (cond=0x82ba4f4,
mutex=0x82ba4dc) at thr_posix.c:277
#3  0xb7efa472 in ldap_int_thread_pool_wrapper (xpool=0x82ba4d8) at
tpool.c:654
#4  0xb7cff1b5 in start_thread () from /lib/libpthread.so.0
#5  0xb7a2438e in clone () from /lib/libc.so.6

Thread 5 (Thread 0xaf721b90 (LWP 15885)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7d02c35 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/libpthread.so.0
#2  0xb7efb094 in ldap_pvt_thread_cond_wait (cond=0xb77b0610,
mutex=0xb77b05f8) at thr_posix.c:277
#3  0x0807a468 in send_ldap_ber (conn=0xb77b0500, ber=0xaf71fde4) at
result.c:217
#4  0x0807c48b in slap_send_search_entry (op=0x839d138, rs=0xaf7210c8)
at result.c:1246
#5  0x0810b30a in monitor_send_children (op=0x839d138, rs=0xaf7210c8,
e_parent=0x835f3bc, sub=1) at search.c:115
#6  0x0810b21c in monitor_send_children (op=0x839d138, rs=0xaf7210c8,
e_parent=<value optimized out>, sub=1) at search.c:123
#7  0x0810b62d in monitor_back_search (op=0x839d138, rs=0xaf7210c8) at
search.c:245
#8  0x0806bbc3 in fe_op_search (op=0x839d138, rs=0xaf7210c8) at search.c:366
#9  0x0806c438 in do_search (op=0x839d138, rs=0xaf7210c8) at search.c:217
#10 0x0806970b in connection_operation (ctx=0xaf7211cc, arg_v=0x839d138)
at connection.c:1100
#11 0x0806a167 in connection_read_thread (ctx=0xaf7211cc, argv=0x1e) at
connection.c:1226
#12 0xb7efa400 in ldap_int_thread_pool_wrapper (xpool=0x82ba4d8) at
tpool.c:663
#13 0xb7cff1b5 in start_thread () from /lib/libpthread.so.0
#14 0xb7a2438e in clone () from /lib/libc.so.6

Thread 4 (Thread 0xaf11eb90 (LWP 15887)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7d057b9 in __lll_lock_wait () from /lib/libpthread.so.0
#2  0xb7d00cd1 in _L_lock_89 () from /lib/libpthread.so.0
#3  0xb7d005b2 in pthread_mutex_lock () from /lib/libpthread.so.0
#4  0xb7efaffd in ldap_pvt_thread_mutex_lock (mutex=0x837a5f8) at
thr_posix.c:296
#5  0x0815f2cc in monitor_cache_lock (e=0x835f3bc) at cache.c:117
#6  0x0810b1a5 in monitor_send_children (op=0x83a4810, rs=0xaf11e0c8,
e_parent=<value optimized out>, sub=1) at search.c:144
#7  0x0810b21c in monitor_send_children (op=0x83a4810, rs=0xaf11e0c8,
e_parent=<value optimized out>, sub=1) at search.c:123
#8  0x0810b62d in monitor_back_search (op=0x83a4810, rs=0xaf11e0c8) at
search.c:245
#9  0x0806bbc3 in fe_op_search (op=0x83a4810, rs=0xaf11e0c8) at search.c:366
#10 0x0806c438 in do_search (op=0x83a4810, rs=0xaf11e0c8) at search.c:217
#11 0x0806970b in connection_operation (ctx=0xaf11e1cc, arg_v=0x83a4810)
at connection.c:1100
#12 0x0806a167 in connection_read_thread (ctx=0xaf11e1cc, argv=0x12) at
connection.c:1226
#13 0xb7efa400 in ldap_int_thread_pool_wrapper (xpool=0x82ba4d8) at
tpool.c:663
#14 0xb7cff1b5 in start_thread () from /lib/libpthread.so.0
#15 0xb7a2438e in clone () from /lib/libc.so.6

Thread 3 (Thread 0xaed1db90 (LWP 15897)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7d02c35 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/libpthread.so.0
#2  0xb7efb094 in ldap_pvt_thread_cond_wait (cond=0x82ba4f4,
mutex=0x82ba4dc) at thr_posix.c:277
#3  0xb7efa472 in ldap_int_thread_pool_wrapper (xpool=0x82ba4d8) at
tpool.c:654
#4  0xb7cff1b5 in start_thread () from /lib/libpthread.so.0
#5  0xb7a2438e in clone () from /lib/libc.so.6

Thread 2 (Thread 0xae91cb90 (LWP 15898)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7d02c35 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/libpthread.so.0
#2  0xb7efb094 in ldap_pvt_thread_cond_wait (cond=0x82ba4f4,
mutex=0x82ba4dc) at thr_posix.c:277
#3  0xb7efa472 in ldap_int_thread_pool_wrapper (xpool=0x82ba4d8) at
tpool.c:654
#4  0xb7cff1b5 in start_thread () from /lib/libpthread.so.0
#5  0xb7a2438e in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb7864720 (LWP 15573)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7cff747 in pthread_join () from /lib/libpthread.so.0
#2  0xb7efb1d4 in ldap_pvt_thread_join (thread=3076791184,
thread_return=0x0) at thr_posix.c:197
#3  0x08063693 in slapd_daemon () at daemon.c:2663
#4  0x08050ee6 in main (argc=8, argv=0xbf852d54) at main.c:948

Follow-Ups:
- Re: RE24 connection code round 2
  - From: Howard Chu <hyc@symas.com>

References:
- Re: RE24 connection code round 2
  - From: ghenry@OpenLDAP.org
- Re: RE24 connection code round 2
  - From: Michael StrÃder <michael@stroeder.com>
- Re: RE24 connection code round 2
  - From: Michael StrÃder <michael@stroeder.com>
- Re: RE24 connection code round 2
  - From: Quanah Gibson-Mount <quanah@zimbra.com>
- Re: RE24 connection code round 2
  - From: Michael StrÃder <michael@stroeder.com>
- Re: RE24 connection code round 2
  - From: Howard Chu <hyc@symas.com>

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