i have fight with this bug a long time now, when i run scripts to MySQL (Percona) i disconnect me, and when i try to import a mysql dump from a live server its here disconnect me to.
So what i'm fight with its why i got connection refuesed every time i try to running my scripts out or trying to import somthing with my GUI client.
have eny how get this messegt to before and know somebody whats happen here? its a local database on our developer server so its not so crical right now.
06:23:02 UTC - mysqld got signal 6 ; This could be because you hit a
bug. It is also possible that this binary or one of the libraries it
was linked against is corrupt, improperly built, or misconfigured.
This error can also be caused by malfunctioning hardware. Attempting
to collect some information that could help diagnose the problem. As
this is a crash and something is definitely wrong, the information
collection process might fail. Please help us make Percona Server
better by reporting any bugs at http://bugs.percona.com/
key_buffer_size=8388608 read_buffer_size=131072
max_used_connections=19 max_threads=152 thread_count=16
connection_count=16 It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads =
68309 K bytes of memory Hope that's ok; if not, decrease some
variables in the equation.
Thread pointer: 0x7f8c80000ae0 Attempting backtrace. You can use the
following information to find out where mysqld died. If you see no
messages after this, something went terribly wrong... stack_bottom =
7f8cd0cd0e80 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x2c)[0xe8197c]
/usr/sbin/mysqld(handle_fatal_signal+0x479)[0x797f89]
/lib/x86_64-linux-gnu/libpthread.so.0(+0xf8d0)[0x7f8d06efc8d0]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x37)[0x7f8d04e82067]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x148)[0x7f8d04e83448]
/usr/sbin/mysqld[0x76c931]
/usr/sbin/mysqld(_ZN2ib5fatalD1Ev+0x15d)[0x10cd45d]
/usr/sbin/mysqld(_Z20buf_page_io_completeP10buf_page_tb+0x9c0)[0x110eff0]
/usr/sbin/mysqld[0x113c424]
/usr/sbin/mysqld(_Z13buf_read_pageRK9page_id_tRK11page_size_tP5trx_t+0x38)[0x113cc68]
/usr/sbin/mysqld(_Z16buf_page_get_genRK9page_id_tRK11page_size_tmP11buf_block_tmPKcmP5mtr_tb+0x4a6)[0x110c096]
/usr/sbin/mysqld(_Z27btr_cur_search_to_nth_levelP12dict_index_tmPK8dtuple_t15page_cur_mode_tmP9btr_cur_tmPKcmP5mtr_t+0x5db)[0x10ecdcb]
/usr/sbin/mysqld[0x103f8a8]
/usr/sbin/mysqld(_Z15row_search_mvccPh15page_cur_mode_tP14row_prebuilt_tmm+0x111b)[0x104266b]
/usr/sbin/mysqld(_ZN11ha_innobase13general_fetchEPhjj+0x1bb)[0xf317cb]
/usr/sbin/mysqld(_ZN7handler18ha_index_next_sameEPhPKhj+0x141)[0x7fa561]
/usr/sbin/mysqld[0xc2b8fa]
/usr/sbin/mysqld(_Z10sub_selectP4JOINP7QEP_TABb+0x147)[0xc326d7]
/usr/sbin/mysqld(_ZN4JOIN4execEv+0x3b8)[0xc2b198]
/usr/sbin/mysqld(_Z12handle_queryP3THDP3LEXP12Query_resultyy+0x238)[0xc9d7a8]
/usr/sbin/mysqld[0x75f30d]
/usr/sbin/mysqld(_Z21mysql_execute_commandP3THDb+0x342c)[0xc5db8c]
/usr/sbin/mysqld(_Z11mysql_parseP3THDP12Parser_state+0x625)[0xc60d25]
/usr/sbin/mysqld(_Z16dispatch_commandP3THDPK8COM_DATA19enum_server_command+0x877)[0xc61617]
/usr/sbin/mysqld(_Z10do_commandP3THD+0x1b7)[0xc62c27]
/usr/sbin/mysqld(handle_connection+0x2a0)[0xd257e0]
/usr/sbin/mysqld(pfs_spawn_thread+0x1b4)[0xe9e804]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x80a4)[0x7f8d06ef50a4]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7f8d04f3562d]
The script error from PHP is, and its kind of random what the error is.
PDOException: SQLSTATE[HY000] [2006] MySQL server has gone away
PDOException: SQLSTATE[HY000] [2002] Connection refused
Answer
There might be several reasons for this error. Often this is caused by a corrupt database. Check if this is the case via:
mysqlcheck --check --all-databases
The PHP exceptions you mentioned aren't important; they are caused by the database crashing, and are an effect rather than a cause.
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