Description:
Swap usage and eventual system crash. Disabled swap to get an output of possible logs to reveal anything useful. I had been looking around for simular issues with other users and haven't come up with anything other than a possible bug.
mysql.err
InnoDB: Warning: a long semaphore wait:
--Thread 1164409152 has waited at btr0cur.c line 424 for 455.00 seconds the semaphore:
X-lock on RW-latch at 0x2aad51637f98 created in file buf0buf.c line 497
a writer (thread id 1099688256) has reserved it in mode exclusive
number of readers 0, waiters flag 1
Last time read locked in file ./../include/btr0btr.ic line 28
Last time write locked in file btr0cur.c line 424
InnoDB: ###### Starts InnoDB Monitor for 30 secs to print diagnostic info:
InnoDB: Pending preads 1, pwrites 0
InnoDB: ###### Diagnostic info printed to the standard error stream
InnoDB: Warning: a long semaphore wait:
--Thread 1164409152 has waited at btr0cur.c line 424 for 618.00 seconds the semaphore:
X-lock on RW-latch at 0x2aad51637f98 created in file buf0buf.c line 497
a writer (thread id 1099688256) has reserved it in mode exclusive
number of readers 0, waiters flag 1
Last time read locked in file ./../include/btr0btr.ic line 28
Last time write locked in file btr0cur.c line 424
InnoDB: Warning: a long semaphore wait:
--Thread 1143429440 has waited at srv0srv.c line 1959 for 312.00 seconds the semaphore:
Mutex at 0x2aaabb1622b8 created file srv0srv.c line 872, lock var 0
waiters flag 1
InnoDB: Warning: a long semaphore wait:
--Thread 1184110912 has waited at trx0trx.c line 213 for 312.00 seconds the semaphore:
Mutex at 0x2aaabb1622b8 created file srv0srv.c line 872, lock var 0
waiters flag 0
InnoDB: Warning: a long semaphore wait:
--Thread 1209137472 has waited at trx0trx.c line 213 for 312.00 seconds the semaphore:
Mutex at 0x2aaabb1622b8 created file srv0srv.c line 872, lock var 0
waiters flag 0
InnoDB: Warning: a long semaphore wait:
--Thread 1218722112 has waited at trx0trx.c line 213 for 308.00 seconds the semaphore:
Mutex at 0x2aaabb1622b8 created file srv0srv.c line 872, lock var 0
waiters flag 0
InnoDB: ###### Starts InnoDB Monitor for 30 secs to print diagnostic info:
InnoDB: Pending preads 1, pwrites 1
my.cnf
[client]
# default_character_set = utf8
user = root
password =
# socket = /var/lib/mysql/logs/mysql.sock
socket = /tmp/mysql.sock
[mysqld_safe]
default_character_set = utf8
basedir = /var/lib/mysql/data
[mysqld]
auto_increment_increment = 1
auto_increment_offset = 1
default_character_set = utf8
key_buffer = 256M
long_query_time = 10
max_allowed_packet = 256M
max_connections = 256
myisam_sort_buffer_size = 64M
port = 3306
read_buffer_size = 2M
read_rnd_buffer_size = 8M
query_cache_size = 256M
server-id = 19507506
skip-locking
sort_buffer_size = 2M
table_cache = 512
thread_cache = 32
thread_concurrency = 16
default_storage_engine = innodb
group_concat_max_len = 131072
datadir = /var/lib/mysql/data
log-bin = /var/lib/mysql/binlog/binlog
# log = /var/lib/mysql/logs/mysql.log
log-error = /var/lib/mysql/logs/mysql.error
pid-file = /var/lib/mysql/logs/mysql.pid
log-slow-queries = /var/lib/mysql/logs/mysql.slow
# socket = /var/lib/mysql/logs/mysql.sock
socket = /tmp/mysql.sock
tmpdir = /dev/shm
log-slave-updates
skip-slave-start
# master-host =
# master-user =
# master-password =
# master-port =
# replicate-do-db =
replicate-ignore-db = mysql
report-host = av-db01-p06
# report-port =
master-info-file = /var/lib/mysql/relay/master.info
relay-log = /var/lib/mysql/relay/relay
relay-log-index = /var/lib/mysql/relay/relay.index
relay-log-info-file = /var/lib/mysql/relay/relay.info
innodb_additional_mem_pool_size = 64M
innodb_buffer_pool_size = 10G
innodb_data_file_path = ibdata01:16G;ibdata02:16G;ibdata03:16G;ibdata04:16G;ibdata05:16G;
innodb_data_home_dir = /var/lib/mysql/ib
innodb_flush_log_at_trx_commit = 1
innodb_lock_wait_timeout = 20
innodb_log_buffer_size = 8M
innodb_log_file_size = 256M
innodb_log_files_in_group = 2
innodb_log_group_home_dir = /var/lib/mysql/ib
How to repeat:
Not sure, system has been operational for about 8 months with no problems this is our 4th crash.
Suggested fix:
N/A
