Comment 2 for bug 523593

Hakan,

IMHO, it does not make sense to report such bugs for the following reasons:
1. there are zillions of edge cases where the server crashes.
2. we, in MariaDB development, cannot afford ourselves spending time to
extract test cases for these crashes.
3. reporting a bag as a MariaDB bug when it's actually a bug of the
mainline MySQL code does not look right.

Regards,

Hakan Küçükyılmaz wrote:
> Public bug reported:
>
> Running RQG optimizer_no_subquery crashes MariaDB. The crash happens on
> Linux 64-bit and Mac OS X Intel 64-bit. However, the crash does not
> happen with MySQL sources on the same machines with the same compile
> script. I attached the full stack trace from a Linux run.
>
> How to repeat
>
> * Get latest Random Query Generator from lp:randgen
> * Get latest MariaDB from lp:maria
> I tested with revno: 2818, timestamp: Wed 2010-02-17 21:10:02 +0100
> * Compile MariaDB with BUILD/compile-amd64-max
> * Run the RQG test like
>
> perl runall.pl \
> --basedir=${HOME}/work/monty_program/maria \
> --engine=InnoDB \
> --grammar=conf/optimizer_no_subquery.yy \
> --queries=100000000 \
> --threads=1 \
> --duration=86400
>
> Stack trace on Linux:
> thd: 0x7fd9489089f0
> 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 = 0x7fd937a22100 thread_stack 0x48000
> /home/hakan/work/monty_program/maria/sql/mysqld(my_print_stacktrace+0x35)[0x9e9cb5]
> /home/hakan/work/monty_program/maria/sql/mysqld(handle_segfault+0x331)[0x618981]
> /lib64/libpthread.so.0[0x7fd95b630a90]
> /home/hakan/work/monty_program/maria/sql/mysqld[0x79a5d2]
> /home/hakan/work/monty_program/maria/sql/mysqld[0x79ad69]
> /home/hakan/work/monty_program/maria/sql/mysqld[0x79b07b]
> /home/hakan/work/monty_program/maria/sql/mysqld[0x68a79a]
> /home/hakan/work/monty_program/maria/sql/mysqld(_ZN4JOIN8optimizeEv+0x56b)[0x68c95b]
> /home/hakan/work/monty_program/maria/sql/mysqld(_Z12mysql_selectP3THDPPP4ItemP10TABLE_LISTjR4ListIS1_ES2_jP8st_orderSB_S2_SB_yP13select_resultP18st_select_lex_unitP13st_select_lex+0x94)[0x6950f4]
> /home/hakan/work/monty_program/maria/sql/mysqld(_Z13handle_selectP3THDP6st_lexP13select_resultm+0x171)[0x695c01]
> /home/hakan/work/monty_program/maria/sql/mysqld[0x626559]
> /home/hakan/work/monty_program/maria/sql/mysqld(_Z21mysql_execute_commandP3THD+0x1da0)[0x62b000]
> /home/hakan/work/monty_program/maria/sql/mysqld(_Z11mysql_parseP3THDPKcjPS2_+0x3b1)[0x62ee91]
> /home/hakan/work/monty_program/maria/sql/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0xe59)[0x62fcf9]
> /home/hakan/work/monty_program/maria/sql/mysqld(_Z10do_commandP3THD+0xee)[0x63056e]
> /home/hakan/work/monty_program/maria/sql/mysqld(handle_one_connection+0x1b9)[0x6221c9]
> /lib64/libpthread.so.0[0x7fd95b629070]
> /lib64/libc.so.6(clone+0x6d)[0x7fd95a6cf11d]
>
> Stack trace on Mac OS X:
> 0 mysqld 0x00000001004f7829 my_print_stacktrace + 57
> 1 mysqld 0x00000001000f24c2 handle_segfault + 802
> 2 libSystem.B.dylib 0x00007fff86eaaeaa _sigtramp + 26
> 3 ??? 0x0000000000000001 0x0 + 1
> 4 mysqld 0x0000000100288b1a _ZL21check_func_dependencyP4JOINyP13List_iteratorI10TABLE_LISTEPS2_P4Item + 538
> 5 mysqld 0x00000001002894b4 _ZL25eliminate_tables_for_listP4JOINP4ListI10TABLE_LISTEyP4Itemy + 340
> 6 mysqld 0x0000000100171fd1 _ZL20make_join_statisticsP4JOINP10TABLE_LISTP4ItemP16st_dynamic_array + 2497
> 7 mysqld 0x0000000100173e3e _ZN4JOIN8optimizeEv + 1374
> 8 mysqld 0x000000010017da54 _Z12mysql_selectP3THDPPP4ItemP10TABLE_LISTjR4ListIS1_ES2_jP8st_orderSB_S2_SB_yP13select_resultP18st_select_lex_unitP13st_select_lex + 148
> 9 mysqld 0x000000010017e572 _Z13handle_selectP3THDP6st_lexP13select_resultm + 370
> 10 mysqld 0x0000000100100383 _ZL21execute_sqlcom_selectP3THDP10TABLE_LIST + 179
> 11 mysqld 0x00000001001062d5 _Z21mysql_execute_commandP3THD + 8293
> 12 mysqld 0x000000010010b048 _Z11mysql_parseP3THDPKcjPS2_ + 536
> 13 mysqld 0x000000010010bbe1 _Z16dispatch_command19enum_server_commandP3THDPcj + 2961
> 14 mysqld 0x000000010010c813 _Z10do_commandP3THD + 243
> 15 mysqld 0x00000001000fcdae handle_one_connection + 302
> 16 libSystem.B.dylib 0x00007fff86e83f8e _pthread_start + 331
> 17 libSystem.B.dylib 0x00007fff86e83e41 thread_start + 13
>
> ** Affects: maria
> Importance: Undecided
> Status: New
>
>
> ** Tags: rqg
>