180508 22:51:02 [ERROR] 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. To report this bug, see https://mariadb.com/kb/en/reporting-bugs We will try our best to scrape up some info that will hopefully help diagnose the problem, but since we have already crashed, something is definitely wrong and this may fail. Server version: 10.2.14-MariaDB-10.2.14+maria~xenial-log key_buffer_size=104857600 read_buffer_size=131072 max_used_connections=75 max_threads=502 thread_count=68 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 1205449 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. Thread pointer: 0x7f7e3c0009a8 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... Ibuf: size 3935, free list len 41336, seg size 45272, 86551 merges merged operations: insert 61696, delete mark 28106027, delete 55015 discarded operations: insert 0, delete mark 1854380, delete 0 Hash table size 8850487, node heap has 7051 buffer(s) 0.00 hash searches/s, 0.05 non-hash searches/s --- LOG --- Log sequence number 60672974957145 Log flushed up to 60672974938678 Pages flushed up to 60672870696146 Last checkpoint at 60672857667387 0 pending log flushes, 0 pending chkp writes 46142 log i/o's done, 0.00 log i/o's/second ---------------------- BUFFER POOL AND MEMORY ---------------------- stack_bottom = 0x7f7f32689cf8 thread_stack 0x49000 *** buffer overflow detected ***: /usr/sbin/mysqld terminated ======= Backtrace: ========= /lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7f80931087e5] /lib/x86_64-linux-gnu/libc.so.6(__fortify_fail+0x5c)[0x7f80931aa15c] /lib/x86_64-linux-gnu/libc.so.6(+0x117160)[0x7f80931a8160] /lib/x86_64-linux-gnu/libc.so.6(+0x1190a7)[0x7f80931aa0a7] /usr/sbin/mysqld(my_addr_resolve+0xde)[0x5635814951ee] /usr/sbin/mysqld(my_print_stacktrace+0x1e2)[0x56358147c1a2] /usr/sbin/mysqld(handle_fatal_signal+0x345)[0x563580f19e95] /lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f8093af7390] /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x38)[0x7f80930c6428] /lib/x86_64-linux-gnu/libc.so.6(abort+0x16a)[0x7f80930c802a] /usr/sbin/mysqld(+0x40c282)[0x563580cca282] /usr/sbin/mysqld(+0x8c57b8)[0x5635811837b8] /usr/sbin/mysqld(_Z17mysql_alter_tableP3THDPcS1_P14HA_CREATE_INFOP10TABLE_LISTP10Alter_infojP8st_orderb+0x2c11)[0x563580e07021] /usr/sbin/mysqld(_ZN19Sql_cmd_alter_table7executeEP3THD+0x5f4)[0x563580e52484] /usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x149f)[0x563580d7bf7f] /usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_statebb+0x28a)[0x563580d8397a] /usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcjbb+0x1f09)[0x563580d866b9] /usr/sbin/mysqld(_Z10do_commandP3THD+0x217)[0x563580d87057] /usr/sbin/mysqld(_Z24do_handle_one_connectionP7CONNECT+0x24a)[0x563580e4f60a] /usr/sbin/mysqld(handle_one_connection+0x3d)[0x563580e4f77d] /lib/x86_64-linux-gnu/libpthread.so.0(+0x76ba)[0x7f8093aed6ba] /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7f809319841d] ======= Memory map: ======== 5635808be000-56358199f000 r-xp 00000000 fc:02 675715 /usr/sbin/mysqld 563581b9e000-563581c70000 r--p 010e0000 fc:02 675715 /usr/sbin/mysqld 563581c70000-563581d26000 rw-p 011b2000 fc:02 675715 /usr/sbin/mysqld 563581d26000-5635825b9000 rw-p 00000000 00:00 0 56358310a000-56358fea0000 rw-p 00000000 00:00 0 [heap] 7f7d54000000-7f7d5402a000 rw-p 00000000 00:00 0 7f7d5402a000-7f7d58000000 ---p 00000000 00:00 0 7f7d5c000000-7f7d5c040000 rw-p 00000000 00:00 0 7f7d5c040000-7f7d60000000 ---p 00000000 00:00 0 7f7d60000000-7f7d63597000 rw-p 00000000 00:00 0 7f7d63597000-7f7d64000000 ---p 00000000 00:00 0 7f7d64000000-7f7d68000000 rw-p 00000000 00:00 0 7f7d6c000000-7f7d70000000 rw-p 00000000 00:00 0 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00000000 00:00 0 7f80947ec000-7f8094805000 r-xp 00000000 fc:02 787531 /lib/x86_64-linux-gnu/libz.so.1.2.8 7f8094805000-7f8094a04000 ---p 00019000 fc:02 787531 /lib/x86_64-linux-gnu/libz.so.1.2.8 7f8094a04000-7f8094a05000 r--p 00018000 fc:02 787531 /lib/x86_64-linux-gnu/libz.so.1.2.8 7f8094a05000-7f8094a06000 rw-p 00019000 fc:02 787531 /lib/x86_64-linux-gnu/libz.so.1.2.8 7f8094a06000-7f8094a10000 r-xp 00000000 fc:02 663205 /usr/lib/x86_64-linux-gnu/libnuma.so.1.0.0 7f8094a10000-7f8094c0f000 ---p 0000a000 fc:02 663205 /usr/lib/x86_64-linux-gnu/libnuma.so.1.0.0 7f8094c0f000-7f8094c10000 r--p 00009000 fc:02 663205 /usr/lib/x86_64-linux-gnu/libnuma.so.1.0.0 7f8094c10000-7f8094c11000 rw-p 0000a000 fc:02 663205 /usr/lib/x86_64-linux-gnu/libnuma.so.1.0.0 7f8094c11000-7f8094c12000 r-xp 00000000 fc:02 798821 /lib/x86_64-linux-gnu/libaio.so.1.0.1 7f8094c12000-7f8094e11000 ---p 00001000 fc:02 798821 /lib/x86_64-linux-gnu/libaio.so.1.0.1 7f8094e11000-7f8094e12000 r--p 00000000 fc:02 798821 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48115183 /[aio] (deleted) 7f80950bc000-7f80950c9000 rw-s 00000000 00:0d 48115182 /[aio] (deleted) 7f80950c9000-7f80950d6000 rw-s 00000000 00:0d 48115181 /[aio] (deleted) 7f80950d6000-7f80950e3000 rw-s 00000000 00:0d 48115180 /[aio] (deleted) 7f80950e3000-7f80950f0000 rw-s 00000000 00:0d 48115179 /[aio] (deleted) 7f80950f0000-7f80950fd000 rw-s 00000000 00:0d 48115178 /[aio] (deleted) 7f80950fd000-7f809510a000 rw-s 00000000 00:0d 48115177 /[aio] (deleted) 7f809510a000-7f80951c0000 rw-p 00000000 00:00 0 7f80951c0000-7f8095240000 r-xp 00000000 fc:02 787978 /lib/x86_64-linux-gnu/libsystemd.so.0.14.0 7f8095240000-7f8095243000 r--p 0007f000 fc:02 787978 /lib/x86_64-linux-gnu/libsystemd.so.0.14.0 7f8095243000-7f8095244000 rw-p 00082000 fc:02 787978 /lib/x86_64-linux-gnu/libsystemd.so.0.14.0 7f8095244000-7f8095247000 rw-p 00000000 00:00 0 7f8095249000-7f809524a000 rw-p 00000000 00:00 0 7f809524a000-7f8095250000 rw-s 00000000 fc:06 49217543 /var/lib/mysql/dbs02b/tc.log 7f8095250000-7f8095251000 r--p 00025000 fc:02 786604 /lib/x86_64-linux-gnu/ld-2.23.so 7f8095251000-7f8095252000 rw-p 00026000 fc:02 786604 /lib/x86_64-linux-gnu/ld-2.23.so 7f8095252000-7f8095253000 rw-p 00000000 00:00 0 7ffd31ae8000-7ffd31b09000 rw-p 00000000 00:00 0 [stack] 7ffd31bce000-7ffd31bd1000 r--p 00000000 00:00 0 [vvar] 7ffd31bd1000-7ffd31bd3000 r-xp 00000000 00:00 0 [vdso] ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]