Hi, 
I've experienced a hang after running a query wich is run usually 2 to 3
times a day without a problem till now. 

This is what the error log reports

nnoDB: Thread 4784139 stopped in file btr0pcur.c line 205
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...
Cannot determine thread, fp=0xbe3fddb8, backtrace may not be correct.
Stack range sanity check OK, backtrace follows:
0x8108af7
0x4014c895
0x8280a88
0x82630ba
0x82694eb
0x82697a1
0x82818f0
0x8282495
0x828267a
0x826b7bc
0x817abf3
0x814edf1
0x814ef81
0x81401e2
0x8137049
0x8137585
0x814e061
0x8118164
0x811b121
0x811552f
0x8114ec2
0x8114637
0x40146c60
0x402e9b77
New value of fp=(nil) failed sanity check, terminating stack trace!

Also have part of the query in the log. and some other warnings about
the memory bee used acording to the defined variables.

I've used resolve_stack_dump -s /usr/lib/mysql/mysqld-max.sym -n
mysqld.stack
as instructed in the manual, with the following result

0x8108af7 handle_segfault + 423
0x4014c895 _end + 934924901
0x8280a88 row_upd_build_sec_rec_difference_binary + 408
0x82630ba row_ins_sec_index_entry_by_modify + 90
0x82694eb row_ins_index_entry_low + 2859
0x82697a1 row_ins_index_entry + 65
0x82818f0 row_upd_sec_index_entry + 848
0x8282495 row_upd + 197
0x828267a row_upd_step + 282
0x826b7bc row_update_for_mysql + 700
0x817abf3 update_row__11ha_innobasePCcPc + 291
0x814edf1 do_updates__12multi_updateb + 465
0x814ef81 send_eof__12multi_update + 49
0x81401e2 do_select__FP4JOINPt4List1Z4ItemP8st_tableP9Procedure + 530
0x8137049 exec__4JOIN + 4185
0x8137585
mysql_select__FP3THDPPP4ItemP13st_table_listUiRt4List1Z4ItemP4ItemUiP8st_orderT7T5T7UlP13select_resultP18st_select_lex_unitP13s
 + 837
0x814e061
mysql_multi_update__FP3THDP13st_table_listPt4List1Z4ItemT2P4ItemUl15enum_duplicatesP18st_select_lex_unitP13st_select_lex
 + 369
0x8118164 mysql_execute_command__FP3THD + 7780
0x811b121 mysql_parse__FP3THDPcUi + 177
0x811552f dispatch_command__F19enum_server_commandP3THDPcUi + 1631
0x8114ec2 do_command__FP3THD + 162
0x8114637 handle_one_connection + 551
0x40146c60 _end + 934901296
0x402e9b77 _end + 936617287

Watching those entries in the error log I cant figure why is this
happening. Can anybody give me a hint?

Thank you 
Mauricio



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