After an upgrade to 10.1.16, MariaDB started crashing (again) ... a lot.
160722 23:14:03 [ERROR] mysqld got signal 11 ;
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This could be because you hit a bug. It is also possible that this binary
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or one of the libraries it was linked against is corrupt, improperly built,
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or misconfigured. This error can also be caused by malfunctioning hardware.
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To report this bug, see https://mariadb.com/kb/en/reporting-bugs
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We will try our best to scrape up some info that will hopefully help
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diagnose the problem, but since we have already crashed,
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something is definitely wrong and this may fail.
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Server version: 10.1.16-MariaDB-1~trusty
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key_buffer_size=16777216
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read_buffer_size=131072
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max_used_connections=23
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max_threads=502
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thread_count=13
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It is possible that mysqld could use up to
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key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 1118998 K bytes of memory
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Hope that's ok; if not, decrease some variables in the equation.
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Thread pointer: 0x0x7f57a83d6008
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Attempting backtrace. You can use the following information to find out
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where mysqld died. If you see no messages after this, something went
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terribly wrong...
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stack_bottom = 0x7f61375fedf0 thread_stack 0x80000
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/usr/sbin/mysqld(my_print_stacktrace+0x2e)[0x7f65391b28fe]
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/usr/sbin/mysqld(handle_fatal_signal+0x2d5)[0x7f6538cd9e75]
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/lib/x86_64-linux-gnu/libpthread.so.0(+0x10330)[0x7f653722f330]
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/usr/sbin/mysqld(+0x4812d4)[0x7f6538baa2d4]
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/usr/sbin/mysqld(_ZN13st_select_lex5printEP3THDP6String15enum_query_type+0x4b2)[0x7f6538baac02]
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/usr/sbin/mysqld(_ZN14Item_subselect5printEP6String15enum_query_type+0x5f)[0x7f6538d69faf]
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/usr/sbin/mysqld(_ZN22Item_func_conv_charset5printEP6String15enum_query_type+0x44)[0x7f6538d57e64]
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/usr/sbin/mysqld(_ZN9Item_func10print_argsEP6Stringj15enum_query_type+0x4f)[0x7f6538d3a9df]
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/usr/sbin/mysqld(_ZN9Item_func5printEP6String15enum_query_type+0x4d)[0x7f6538d3aabd]
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/usr/sbin/mysqld(_ZN9Item_func10print_argsEP6Stringj15enum_query_type+0x4f)[0x7f6538d3a9df]
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/usr/sbin/mysqld(_ZN9Item_func5printEP6String15enum_query_type+0x4d)[0x7f6538d3aabd]
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/usr/sbin/mysqld(_ZN4Item17print_item_w_nameEP6String15enum_query_type+0x1c)[0x7f6538cf0fdc]
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/usr/sbin/mysqld(_ZN13st_select_lex5printEP3THDP6String15enum_query_type+0x226)[0x7f6538baa976]
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/usr/sbin/mysqld(_ZN18st_select_lex_unit5printEP6String15enum_query_type+0x57)[0x7f6538b4c267]
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/usr/sbin/mysqld(_Z29mysqld_show_create_get_fieldsP3THDP10TABLE_LISTP4ListI4ItemEP6String+0x302)[0x7f6538bb9eb2]
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/usr/sbin/mysqld(_Z18mysqld_show_createP3THDP10TABLE_LIST+0xc0)[0x7f6538bba8e0]
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/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x3fbc)[0x7f6538b5aecc]
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/usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_state+0x26d)[0x7f6538b6073d]
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/usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x2460)[0x7f6538b63a80]
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/usr/sbin/mysqld(_Z10do_commandP3THD+0x169)[0x7f6538b64239]
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/usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0x18a)[0x7f6538c2889a]
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/usr/sbin/mysqld(handle_one_connection+0x40)[0x7f6538c28a70]
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/lib/x86_64-linux-gnu/libpthread.so.0(+0x8184)[0x7f6537227184]
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/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7f653674637d]
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Trying to get some variables.
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Some pointers may be invalid and cause the dump to abort.
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Query (0x7f57a70fe020): is an invalid pointer
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Connection ID (thread ID): 478
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For my config, see MDEV-9674.
Downgrading to 10.1.14 solved the crashing.
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