MySQL Bugs: #57515: updatexml dies with Assertion failed: fixed == 1

Bug #57515	updatexml dies with Assertion failed: fixed == 1
Submitted:	18 Oct 2010 10:43	Modified:	3 Nov 2010 12:44
Reporter:	Shane Bester (Platinum Quality Contributor)	Email Updates:
Status:	Duplicate	Impact on me:	None
Category:	MySQL Server: General	Severity:	S1 (Critical)
Version:	5.5.7-debug	OS:	Any
Assigned to:	Assigned Account	CPU Architecture:	Any
Tags:	updatexml

Description:
Version: '5.5.6-rc-debug'  socket: ''  port: 3306  MySQL Community Server - Debug (GPL)
Assertion failed: fixed == 1, file ..\..\mysql-5.5.6-rc\sql\item_strfunc.cc, line 2909

mysqld-debug.exe!my_sigabrt_handler()[my_thr_init.c:521]
mysqld-debug.exe!raise()[winsig.c:590]
mysqld-debug.exe!abort()[abort.c:71]
mysqld-debug.exe!_wassert()[assert.c:163]
mysqld-debug.exe!Item_func_conv_charset::val_str()[item_strfunc.cc:2909]
mysqld-debug.exe!Item_xml_str_func::fix_length_and_dec()[item_xmlfunc.cc:2599]
mysqld-debug.exe!Item_func::fix_fields()[item_func.cc:219]
mysqld-debug.exe!Item_str_func::fix_fields()[item_strfunc.cc:117]
mysqld-debug.exe!setup_fields()[sql_base.cc:7720]
mysqld-debug.exe!JOIN::prepare()[sql_select.cc:549]
mysqld-debug.exe!mysql_select()[sql_select.cc:2520]
mysqld-debug.exe!handle_select()[sql_select.cc:296]
mysqld-debug.exe!execute_sqlcom_select()[sql_parse.cc:4565]
mysqld-debug.exe!mysql_execute_command()[sql_parse.cc:2175]
mysqld-debug.exe!mysql_parse()[sql_parse.cc:5594]
mysqld-debug.exe!dispatch_command()[sql_parse.cc:1139]
mysqld-debug.exe!do_command()[sql_parse.cc:811]
mysqld-debug.exe!do_handle_one_connection()[sql_connect.cc:1191]
mysqld-debug.exe!handle_one_connection()[sql_connect.cc:1130]
mysqld-debug.exe!pthread_start()[my_winthread.c:61]
mysqld-debug.exe!_callthreadstartex()[threadex.c:348]
mysqld-debug.exe!_threadstartex()[threadex.c:331]

5.1.51 doesn't crash, so this is a regression

How to repeat:
#on debug build:

set names utf8 collate utf8_latvian_ci ;
select updatexml(-73 * -2465717823867977728,@@global.slave_net_timeout,null);

Thank you for the bug report. Verified as described.

01018  9:41:35 [Note] dbs/5.5/libexec/mysqld: ready for connections.
Version: '5.5.7-rc-debug'  socket: '/tmp/mysql.sock'  port: 3306  Source distribution
mysqld: item_strfunc.cc:2909: virtual String* Item_func_conv_charset::val_str(String*): Assertion `fixed == 1' failed.
101018  9:41:50 - 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.
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.

key_buffer_size=8388608
read_buffer_size=131072
max_used_connections=1
max_threads=151
thread_count=1
connection_count=1
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 338549 K
bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

thd: 0x3b055d0
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 = 0x7f671a4e8e68 thread_stack 0x40000
dbs/5.5/libexec/mysqld(my_print_stacktrace+0x35)[0xb92c71]
dbs/5.5/libexec/mysqld(handle_segfault+0x2ae)[0x6a1568]
/lib/libpthread.so.0(+0xfb40)[0x7f672be2cb40]
/lib/libc.so.6(gsignal+0x35)[0x7f672b1f3ba5]
/lib/libc.so.6(abort+0x180)[0x7f672b1f76b0]
/lib/libc.so.6(__assert_fail+0xf1)[0x7f672b1eca71]
dbs/5.5/libexec/mysqld(_ZN22Item_func_conv_charset7val_strEP6String+0x3a)[0x62360a]
dbs/5.5/libexec/mysqld(_ZN17Item_xml_str_func18fix_length_and_decEv+0x152)[0x65af52]
dbs/5.5/libexec/mysqld(_ZN9Item_func10fix_fieldsEP3THDPP4Item+0x3d4)[0x5e917c]
dbs/5.5/libexec/mysqld(_ZN13Item_str_func10fix_fieldsEP3THDPP4Item+0x2b)[0x6196af]
dbs/5.5/libexec/mysqld(_Z12setup_fieldsP3THDPP4ItemR4ListIS1_E17enum_mark_columnsPS5_b+0x25a)[0x713361]
dbs/5.5/libexec/mysqld(_ZN4JOIN7prepareEPPP4ItemP10TABLE_LISTjS1_jP8st_orderS7_S1_S7_P13st_select_lexP18st_select_lex_unit+0x394)[0x728154]
dbs/5.5/libexec/mysqld(_Z12mysql_selectP3THDPPP4ItemP10TABLE_LISTjR4ListIS1_ES2_jP8st_orderSB_S2_SB_yP13select_resultP18st_select_lex_unitP13st_select_lex+0x242)[0x72f41c]
dbs/5.5/libexec/mysqld(_Z13handle_selectP3THDP3LEXP13select_resultm+0x198)[0x727944]
dbs/5.5/libexec/mysqld[0x6babe3]
dbs/5.5/libexec/mysqld(_Z21mysql_execute_commandP3THD+0x9cb)[0x6b3a3e]
dbs/5.5/libexec/mysqld(_Z11mysql_parseP3THDPcjP12Parser_state+0x1ee)[0x6bccf6]
dbs/5.5/libexec/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0xa55)[0x6b137a]
dbs/5.5/libexec/mysqld(_Z10do_commandP3THD+0x250)[0x6b0722]
dbs/5.5/libexec/mysqld(_Z24do_handle_one_connectionP3THD+0x19c)[0x6ae784]
dbs/5.5/libexec/mysqld(handle_one_connection+0x33)[0x6ae5e1]
/lib/libpthread.so.0(+0x7971)[0x7f672be24971]
/lib/libc.so.6(clone+0x6d)[0x7f672b2a692d]
Trying to get some variables.
Some pointers may be invalid and cause the dump to abort...
thd->query at 0x3b87350 = select updatexml(-73 * -2465717823867977728,@@global.slave_net_timeout,null)
thd->thread_id=1
thd->killed=NOT_KILLED
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
miguel@tikal:~$

Duplicate of BUG#57882.