Details
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Bug
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Status: Closed (View Workflow)
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Blocker
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Resolution: Fixed
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5.5.28a
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None
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None
Description
A statement like
DELETE Z<repeats 10000 times>ROM t WHERE 1=1
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will crash the server when the client disconnects. Crash happens when trying to free THD::st_transaction::mem_root, because mem_root->free->next pointer is corrupted. It's corrupted in here
#0 0x00007ffff602e660 in __stpcpy_sse2_unaligned () from /lib64/libc.so.6
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#1 0x00000000006c3ace in MDL_key::mdl_key_init (this=0x7fffdc0067f8,
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mdl_namespace=MDL_key::TABLE, db=0x7fffdc006990 'Z' <repeats 6778 times>,
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name=0x7fffdc00ecb8 'Z' <repeats 10000 times>, "ROM")
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at /home/serg/Abk/mysql/5.5/sql/mdl.h:246
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#2 0x000000000071b7af in MDL_request::init (this=0x7fffdc0067d8,
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mdl_namespace=MDL_key::TABLE,
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db_arg=0x7fffdc006990 'Z' <repeats 6778 times>,
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name_arg=0x7fffdc00ecb8 'Z' <repeats 10000 times>, "ROM",
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mdl_type_arg=MDL_SHARED_WRITE, mdl_duration_arg=MDL_TRANSACTION)
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at /home/serg/Abk/mysql/5.5/sql/mdl.cc:1003
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#3 0x000000000062834c in st_select_lex::add_table_to_list (this=0x1e0cfe8,
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thd=0x1e0a4e0, table=0x7fffdc0063a0, alias=0x0, table_options=9,
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lock_type=TL_WRITE_DEFAULT, mdl_type=MDL_SHARED_WRITE,
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index_hints_arg=0x0, option=0x0)
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at /home/serg/Abk/mysql/5.5/sql/sql_parse.cc:6114
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#4 0x000000000077a4a5 in MYSQLparse (yythd=0x1e0a4e0)
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at /home/serg/Abk/mysql/5.5/sql/sql_yacc.yy:11216
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Attachments
Issue Links
- is part of
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MDEV-3986 pre-release merge
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- Closed
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- links to