data_dictionary crash

[Andrew Hutchings]

Crash when doing:

SELECT * FROM `data_dictionary` . SHOW_COLUMNS;

Simple as that :(

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffdeffd700 (LWP 11297)]
0x000000376049e4eb in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) () from /usr/lib64/libstdc++.so.6
(gdb) bt
#0 0x000000376049e4eb in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) () from /usr/lib64/libstdc++.so.6
#1 0x0000000000bbeade in drizzled::statement::Show::getShowTable() ()
#2 0x0000000000bbd6e8 in ShowColumns::Generator::Generator (this=0x7fffc8006c80, arg=0x7fffc800d808) at plugin/show_dictionary/show_columns.cc:62
#3 0x0000000000bbec4c in ShowColumns::generator(drizzled::Field**) ()
#4 0x00000000009f0fd8 in FunctionCursor::doStartTableScan (this=0x7fffc800b600) at plugin/function_engine/cursor.cc:70
#5 0x000000000073c2f7 in drizzled::Cursor::startTableScan (this=0x7fffc800b600, scan=true) at drizzled/cursor.cc:149
#6 0x00000000008db6e6 in drizzled::ReadRecord::init_read_record (this=0x7fffc800eb40, session_arg=0x1d346e0, table_arg=0x7fffc8006fb0, select_arg=0x7fffc800ee90, use_record_cache=1, print_error_arg=true) at drizzled/records.cc:157
#7 0x000000000091edd0 in drizzled::join_init_read_record (tab=0x7fffc800eab8) at drizzled/sql_select.cc:3731
#8 0x000000000091dc0b in drizzled::sub_select (join=0x7fffc8004ed8, join_tab=0x7fffc800eab8, end_of_records=false) at drizzled/sql_select.cc:3327
#9 0x000000000091d822 in drizzled::do_select (join=0x7fffc8004ed8, fields=0x1d353f8, table=0x0) at drizzled/sql_select.cc:3097
#10 0x0000000000856abc in drizzled::Join::exec (this=0x7fffc8004ed8) at drizzled/join.cc:1683
#11 0x0000000000917562 in drizzled::select_query (session=0x1d346e0, rref_pointer_array=0x1d354b8, tables=0x7fffc8004d08, wild_num=1, fields=..., conds=0x0, og_num=0, order=0x0, group=0x0, having=0x0, select_options=2147500032, result=0x7fffc8004eb8, unit=0x1d35100, select_lex=0x1d35300) at drizzled/sql_select.cc:432
#12 0x0000000000916e75 in drizzled::handle_select (session=0x1d346e0, lex=0x1d350e0, result=0x7fffc8004eb8, setup_tables_done_option=0) at drizzled/sql_select.cc:151
#13 0x000000000091309d in drizzled::execute_sqlcom_select (session=0x1d346e0, all_tables=0x7fffc8004d08) at drizzled/sql_parse.cc:545
#14 0x000000000096cba3 in drizzled::statement::Select::execute (this=0x7fffc8006d80) at drizzled/statement/select.cc:32
#15 0x0000000000912d3b in drizzled::execute_command (session=0x1d346e0) at drizzled/sql_parse.cc:480
#16 0x000000000091397a in drizzled::parse (session=0x1d346e0, inBuf=0x7fffc8006ba8 "SELECT * FROM `data_dictionary` . SHOW_COLUMNS", length=46) at drizzled/sql_parse.cc:751
#17 0x000000000091265f in drizzled::dispatch_command (command=drizzled::COM_QUERY, session=0x1d346e0, packet=0x1d35d01 "", packet_length=46) at drizzled/sql_parse.cc:228
#18 0x00000000008e28c8 in drizzled::Session::executeStatement (this=0x1d346e0) at drizzled/session.cc:723
#19 0x00000000008e224a in drizzled::Session::run (this=0x1d346e0) at drizzled/session.cc:564
#20 0x00007ffff557071d in multi_thread::MultiThreadScheduler::runSession (this=0x1d12350, id=1) at plugin/multi_thread/multi_thread.cc:77
#21 0x00007ffff558280e in boost::_mfi::mf1<void, multi_thread::MultiThreadScheduler, long>::operator() (this=0x1d3a030, p=0x1d12350, a1=1) at /usr/include/boost/bind/mem_fn_template.hpp:165
#22 0x00007ffff5581d01 in boost::_bi::list2<boost::_bi::value<multi_thread::MultiThreadScheduler*>, boost::_bi::value<long> >::operator()<boost::_mfi::mf1<void, multi_thread::MultiThreadScheduler, long>, boost::_bi::list0> (this=0x1d3a040, f=..., a=...) at /usr/include/boost/bind/bind.hpp:313
#23 0x00007ffff55814fc in boost::_bi::bind_t<void, boost::_mfi::mf1<void, multi_thread::MultiThreadScheduler, long>, boost::_bi::list2<boost::_bi::value<multi_thread::MultiThreadScheduler*>, boost::_bi::value<long> > >::operator() (this=0x1d3a030) at /usr/include/boost/bind/bind_template.hpp:20
#24 0x00007ffff55809a0 in boost::detail::thread_data<boost::_bi::bind_t<void, boost::_mfi::mf1<void, multi_thread::MultiThreadScheduler, long>, boost::_bi::list2<boost::_bi::value<multi_thread::MultiThreadScheduler*>, boost::_bi::value<long> > > >::run (this=0x1d39f00) at /usr/include/boost/thread/detail/thread.hpp:61
#25 0x00007ffff7830a55 in thread_proxy () from /usr/lib64/libboost_thread-mt.so.1.44.0
#26 0x0000003755406d5b in start_thread () from /lib64/libpthread.so.0
#27 0x00000037550e4a7d in clone () from /lib64/libc.so.6

[Andrew Hutchings (linuxjedi)]

looks like we are expecting to only hit this table from a SHOW command, which is probably not a good idea

[Andrew Hutchings (linuxjedi)]

This table is hidden from data_dictionary, it really shouldn't be accessible using it.

[Andrew Hutchings (linuxjedi)]

drop to medium as you can only access it if you knew the table existed in the first place