Comment #1 on issue 324 by sunyz...@gmail.com: dead lock occur when get one
key from memcache
http://code.google.com/p/memcached/issues/detail?id=324
[Thread debugging using libthread_db enabled]
[New Thread 47738147628624 (LWP 14085)]
[New Thread 1144318272 (LWP 14090)]
[New Thread 1133828416 (LWP 14089)]
[New Thread 1123338560 (LWP 14088)]
[New Thread 1112848704 (LWP 14087)]
[New Thread 1102358848 (LWP 14086)]
Loaded symbols for /lib64/libpthread.so.0
Reading symbols from /lib64/libc.so.6...done.
Loaded symbols for /lib64/libc.so.6
Reading symbols from /lib64/ld-linux-x86-64.so.2...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /lib64/libnss_files.so.2...done.
Loaded symbols for /lib64/libnss_files.so.2
0x00000035a00d21d8 in epoll_wait () from /lib64/libc.so.6
(gdb) bt
#0 0x00000035a00d21d8 in epoll_wait () from /lib64/libc.so.6
#1 0x00002b6ae7329388 in epoll_dispatch (base=0xf12e2c0, tv=<value
optimized out>) at epoll.c:404
#2 0x00002b6ae731812c in event_base_loop (base=0xf12e2c0, flags=0) at
event.c:1565
#3 0x0000000000408550 in main (argc=<value optimized out>, argv=<value
optimized out>) at memcached.c:5120
(gdb) info threads
6 Thread 1102358848 (LWP 14086) 0x00000035a1008969 in
pthread_mutex_trylock () from /lib64/libpthread.so.0
5 Thread 1112848704 (LWP 14087) 0x00000035a10089b4 in
pthread_mutex_trylock () from /lib64/libpthread.so.0
4 Thread 1123338560 (LWP 14088) 0x00000035a100c898 in
__lll_mutex_lock_wait () from /lib64/libpthread.so.0
3 Thread 1133828416 (LWP 14089) 0x00000035a10089b4 in
pthread_mutex_trylock () from /lib64/libpthread.so.0
2 Thread 1144318272 (LWP 14090) 0x00000035a100c898 in
__lll_mutex_lock_wait () from /lib64/libpthread.so.0
1 Thread 47738147628624 (LWP 14085) 0x00000035a00d21d8 in epoll_wait ()
from /lib64/libc.so.6
(gdb) t 6
[Switching to thread 6 (Thread 1102358848 (LWP 14086))]#0
0x00000035a1008969 in pthread_mutex_trylock ()
from /lib64/libpthread.so.0
(gdb) bt
#0 0x00000035a1008969 in pthread_mutex_trylock () from
/lib64/libpthread.so.0
#1 0x000000000040d03a in do_item_get (key=0xf260ec4 "yy860918_basic",
nkey=14, hv=1533454680) at memcached.h:469
#2 0x000000000040ec96 in item_get (key=0xf260ec4 "yy860918_basic",
nkey=14) at thread.c:359
#3 0x0000000000404b94 in process_get_command (c=0xf260cc0,
tokens=0x41b49e90, ntokens=1, return_cas=false) at memcached.c:2706
#4 0x00000000004097d9 in process_command (c=0xf260cc0, command=<value
optimized out>) at memcached.c:3210
#5 0x0000000000409fae in try_read_command (c=0xf260cc0) at memcached.c:3423
#6 0x000000000040acda in event_handler (fd=<value optimized out>,
which=14, arg=0xf260cc0) at memcached.c:3743
#7 0x00002b6ae73184d9 in event_base_loop (base=0xf13bc60, flags=0) at
event.c:1315
#8 0x000000000040e534 in worker_libevent (arg=0xf12ee30) at thread.c:259
#9 0x00000035a1006307 in start_thread () from /lib64/libpthread.so.0
#10 0x00000035a00d1ded in clone () from /lib64/libc.so.6
(gdb) t 5
[Switching to thread 5 (Thread 1112848704 (LWP 14087))]#0
0x00000035a10089b4 in pthread_mutex_trylock ()
from /lib64/libpthread.so.0
(gdb) bt
#0 0x00000035a10089b4 in pthread_mutex_trylock () from
/lib64/libpthread.so.0
#1 0x000000000040d03a in do_item_get (key=0xf1628f4 "q983457546_error",
nkey=16, hv=2413688821) at memcached.h:469
#2 0x000000000040ec96 in item_get (key=0xf1628f4 "q983457546_error",
nkey=16) at thread.c:359
#3 0x0000000000404b94 in process_get_command (c=0xf1626f0,
tokens=0x4254ae90, ntokens=1, return_cas=false) at memcached.c:2706
#4 0x00000000004097d9 in process_command (c=0xf1626f0, command=<value
optimized out>) at memcached.c:3210
#5 0x0000000000409fae in try_read_command (c=0xf1626f0) at memcached.c:3423
#6 0x000000000040acda in event_handler (fd=<value optimized out>,
which=16, arg=0xf1626f0) at memcached.c:3743
#7 0x00002b6ae73184d9 in event_base_loop (base=0xf13c460, flags=0) at
event.c:1315
#8 0x000000000040e534 in worker_libevent (arg=0xf1321b8) at thread.c:259
#9 0x00000035a1006307 in start_thread () from /lib64/libpthread.so.0
#10 0x00000035a00d1ded in clone () from /lib64/libc.so.6
(gdb) t 4
[Switching to thread 4 (Thread 1123338560 (LWP 14088))]#0
0x00000035a100c898 in __lll_mutex_lock_wait ()
from /lib64/libpthread.so.0
(gdb) bt
#0 0x00000035a100c898 in __lll_mutex_lock_wait () from
/lib64/libpthread.so.0
#1 0x00000035a100a868 in pthread_cond_signal@@GLIBC_2.3.2 () from
/lib64/libpthread.so.0
#2 0x000000000040dad0 in assoc_insert (it=<value optimized out>, hv=<value
optimized out>) at assoc.c:139
#3 0x000000000040d2c5 in do_item_link (it=0x2aaaac92d7a0, hv=1349979716)
at items.c:292
#4 0x0000000000408cac in do_store_item (it=0x2aaaac92d7a0, comm=2,
c=0xf25a3a0, hv=1349979716) at memcached.c:2342
#5 0x000000000040e99d in store_item (item=0x2aaaac92d7a0, comm=2,
c=0xf25a3a0) at thread.c:459
#6 0x0000000000406312 in complete_nread (c=0xf25a3a0) at memcached.c:836
#7 0x000000000040b067 in event_handler (fd=<value optimized out>, which=0,
arg=0xf25a3a0) at memcached.c:3780
#8 0x00002b6ae73184d9 in event_base_loop (base=0xf13cd00, flags=0) at
event.c:1315
#9 0x000000000040e534 in worker_libevent (arg=0xf135540) at thread.c:259
#10 0x00000035a1006307 in start_thread () from /lib64/libpthread.so.0
#11 0x00000035a00d1ded in clone () from /lib64/libc.so.6
(gdb) t 3
[Switching to thread 3 (Thread 1133828416 (LWP 14089))]#0
0x00000035a10089b4 in pthread_mutex_trylock ()
from /lib64/libpthread.so.0
(gdb) bt
#0 0x00000035a10089b4 in pthread_mutex_trylock () from
/lib64/libpthread.so.0
#1 0x000000000040d03a in do_item_get (key=0xf250754 "h5286455_basic",
nkey=14, hv=1156733566) at memcached.h:469
#2 0x000000000040ec96 in item_get (key=0xf250754 "h5286455_basic",
nkey=14) at thread.c:359
#3 0x0000000000404b94 in process_get_command (c=0xf250550,
tokens=0x4394ce90, ntokens=1, return_cas=false) at memcached.c:2706
#4 0x00000000004097d9 in process_command (c=0xf250550, command=<value
optimized out>) at memcached.c:3210
#5 0x0000000000409fae in try_read_command (c=0xf250550) at memcached.c:3423
#6 0x000000000040acda in event_handler (fd=<value optimized out>,
which=14, arg=0xf250550) at memcached.c:3743
#7 0x00002b6ae73184d9 in event_base_loop (base=0xf13d5a0, flags=0) at
event.c:1315
#8 0x000000000040e534 in worker_libevent (arg=0xf1388c8) at thread.c:259
#9 0x00000035a1006307 in start_thread () from /lib64/libpthread.so.0
#10 0x00000035a00d1ded in clone () from /lib64/libc.so.6
(gdb) info threads
6 Thread 1102358848 (LWP 14086) 0x00000035a1008969 in
pthread_mutex_trylock () from /lib64/libpthread.so.0
5 Thread 1112848704 (LWP 14087) 0x00000035a10089b4 in
pthread_mutex_trylock () from /lib64/libpthread.so.0
4 Thread 1123338560 (LWP 14088) 0x00000035a100c898 in
__lll_mutex_lock_wait () from /lib64/libpthread.so.0
* 3 Thread 1133828416 (LWP 14089) 0x00000035a10089b4 in
pthread_mutex_trylock () from /lib64/libpthread.so.0
2 Thread 1144318272 (LWP 14090) 0x00000035a100c898 in
__lll_mutex_lock_wait () from /lib64/libpthread.so.0
1 Thread 47738147628624 (LWP 14085) 0x00000035a00d21d8 in epoll_wait ()
from /lib64/libc.so.6
(gdb) t 2
[Switching to thread 2 (Thread 1144318272 (LWP 14090))]#0
0x00000035a100c898 in __lll_mutex_lock_wait ()
from /lib64/libpthread.so.0
(gdb) bt
#0 0x00000035a100c898 in __lll_mutex_lock_wait () from
/lib64/libpthread.so.0
#1 0x00000035a100a55e in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib64/libpthread.so.0
#2 0x000000000040dc90 in assoc_maintenance_thread (arg=<value optimized
out>) at assoc.c:235
#3 0x00000035a1006307 in start_thread () from /lib64/libpthread.so.0
#4 0x00000035a00d1ded in clone () from /lib64/libc.so.6
(gdb)
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