MySQL Bug一例-----ibuf cursor restoration fails

产生原因：
1、开启change buffer（innodb_change_buffering）
2、对表进行大量delete 操作
3、对相同表进行truncate

bug名称：ibuf cursor restoration fails（change buffer 游标存储失败）
改进：升级版本至 5.7.31 或者 8.0.21

2020-07-02T12:01:54.342463+08:00 0 [ERROR] InnoDB: ibuf cursor restoration fails!. ibuf record inserted to page 49868:25715
2020-07-02T12:01:54.342522+08:00 0 [ERROR] InnoDB: Submit a detailed bug report to http://bugs.mysql.com
PHYSICAL RECORD: n_fields 7; 1-byte offsets; info bits 00: len 4; hex 00002722; asc   '";;1: len 1; hex 00; asc  ;;2: len 4; hex 00000b3a; asc    :;;3: len 22; hex 001400010c0f00c8002d0c0f0100802d860800088000; asc          -     -      ;;4: len 30; hex e6b599e6b19fe6b0b8e5a4aae7a791e68a80e882a1e4bbbde69c89e99990; asc                               ; (total 36 bytes);5: len 30; hex 5041524b3436335f454d5330315f41434f50535f44454641554c545f4c6f; asc PARK463_EMS01_ACOPS_DEFAULT_Lo; (total 33 bytes);6: len 8; hex 800000000002ab31; asc        1;;
PHYSICAL RECORD: n_fields 7; 1-byte offsets; info bits 00: len 4; hex 00002722; asc   '";;1: len 1; hex 00; asc  ;;2: len 4; hex 00000b3a; asc    :;;3: len 22; hex 001400010c0f00c8002d0c0f0100802d860800088000; asc          -     -      ;;4: len 30; hex e6b599e6b19fe6b0b8e5a4aae7a791e68a80e882a1e4bbbde69c89e99990; asc                               ; (total 36 bytes);5: len 30; hex 5041524b3436335f454d5330315f41434f50535f44454641554c545f4c6f; asc PARK463_EMS01_ACOPS_DEFAULT_Lo; (total 33 bytes);6: len 8; hex 800000000002ab31; asc        1;;
DATA TUPLE: 3 fields;0: len 4; hex 0000c2cc; asc     ;;1: len 1; hex 00; asc  ;;2: len 4; hex 00006473; asc   ds;;
PHYSICAL RECORD: n_fields 9; 1-byte offsets; info bits 320: len 4; hex 0000c2cc; asc     ;;1: len 1; hex 00; asc  ;;2: len 4; hex 00006473; asc   ds;;3: len 30; hex 009701010c0f0100802d0c0f0200002d0c0f0100802d830c000580080800; asc          -     -     -        ; (total 34 bytes);4: len 13; hex 5041524b3534375f4350533031; asc PARK547_CPS01;;5: len 9; hex 4543525f4543523030; asc ECR_ECR00;;6: len 8; hex 4454636f6e644131; asc DTcondA1;;7: len 5; hex 99a6c2fb40; asc     @;;8: len 6; hex 0000504d6be5; asc   PMk ;;
2020-07-02T12:01:54.343977+08:00 0 [ERROR] [FATAL] InnoDB: Failed to restore ibuf position.
2020-07-02 12:01:54 0x7fe71903a700  InnoDB: Assertion failure in thread 140630533842688 in file ut0ut.cc line 910
2020-07-02 12:01:54 0x7fe71903a700  InnoDB: Assertion failure in thread 140630533842688 in file ut0ut.cc line 910
InnoDB: We intentionally generate a memory trap.
InnoDB: Submit a detailed bug report to http://bugs.mysql.com.
InnoDB: If you get repeated assertion failures or crashes, even
InnoDB: immediately after the mysqld startup, there may be
InnoDB: corruption in the InnoDB tablespace. Please refer to
InnoDB: http://dev.mysql.com/doc/refman/5.7/en/forcing-innodb-recovery.html
InnoDB: about forcing recovery.
04:01:54 UTC - 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.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.key_buffer_size=8388608
read_buffer_size=524288
max_used_connections=85
max_threads=800
thread_count=39
connection_count=38
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 1247698 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.Thread pointer: 0x0
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 = 0 thread_stack 0x40000
/usr/local/mysql/bin/mysqld(my_print_stacktrace+0x35)[0xf54815]
/usr/local/mysql/bin/mysqld(handle_fatal_signal+0x4a4)[0x7d21b4]
/lib64/libpthread.so.0(+0xf100)[0x7fe9436bd100]
/lib64/libc.so.6(gsignal+0x37)[0x7fe9420b15f7]
/lib64/libc.so.6(abort+0x148)[0x7fe9420b2ce8]
/usr/local/mysql/bin/mysqld(_Z18ut_print_timestampP8_IO_FILE+0x0)[0x7c157e]
/usr/local/mysql/bin/mysqld(_ZN2ib5fatalD1Ev+0xb3)[0x115c0a3]
/usr/local/mysql/bin/mysqld[0x102f9f1]
/usr/local/mysql/bin/mysqld[0x1034069]
/usr/local/mysql/bin/mysqld(_Z29ibuf_merge_or_delete_for_pageP11buf_block_tRK9page_id_tPK11page_size_tm+0xa6b)[0x1039c1b]
/usr/local/mysql/bin/mysqld(_Z20buf_page_io_completeP10buf_page_tb+0x4c9)[0x1197839]
/usr/local/mysql/bin/mysqld(_Z12fil_aio_waitm+0xfe)[0x120962e]
/usr/local/mysql/bin/mysqld(io_handler_thread+0xd0)[0x110ebd0]
/lib64/libpthread.so.0(+0x7dc5)[0x7fe9436b5dc5]
/lib64/libc.so.6(clone+0x6d)[0x7fe94217221d]
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.

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