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xtrabackup_slave_info文件是空的 #3
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备份时输出日志是什么? |
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当参数--slave-info的时候, 日志会打印一条: |
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Mar 24, 2022
…E TO A SERVER
Problem
========================================================================
Running the GCS tests with ASAN seldomly reports a user-after-free of
the server reference that the acceptor_learner_task uses.
Here is an excerpt of ASAN's output:
==43936==ERROR: AddressSanitizer: heap-use-after-free on address 0x63100021c840 at pc 0x000000530ff8 bp 0x7fc0427e8530 sp 0x7fc0427e8520
WRITE of size 8 at 0x63100021c840 thread T3
#0 0x530ff7 in server_detected /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/xcom_transport.c:962
#1 0x533814 in buffered_read_bytes /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/xcom_transport.c:1249
xelabs#2 0x5481af in buffered_read_msg /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/xcom_transport.c:1399
xelabs#3 0x51e171 in acceptor_learner_task /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/xcom_base.c:4690
xelabs#4 0x562357 in task_loop /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/task.c:1140
xelabs#5 0x5003b2 in xcom_taskmain2 /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/xcom_base.c:1324
xelabs#6 0x6a278a in Gcs_xcom_proxy_impl::xcom_init(unsigned short, node_address*) /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/gcs_xcom_proxy.cc:164
percona#7 0x59b3c1 in xcom_taskmain_startup /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/gcs_xcom_control_interface.cc:107
percona#8 0x7fc04a2e4dd4 in start_thread (/lib64/libpthread.so.0+0x7dd4)
percona#9 0x7fc047ff2bfc in __clone (/lib64/libc.so.6+0xfebfc)
0x63100021c840 is located 64 bytes inside of 65688-byte region [0x63100021c800,0x63100022c898)
freed by thread T3 here:
#0 0x7fc04a5d7508 in __interceptor_free (/lib64/libasan.so.4+0xde508)
#1 0x52cf86 in freesrv /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/xcom_transport.c:836
xelabs#2 0x52ea78 in srv_unref /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/xcom_transport.c:868
xelabs#3 0x524c30 in reply_handler_task /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/xcom_base.c:4914
xelabs#4 0x562357 in task_loop /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/task.c:1140
xelabs#5 0x5003b2 in xcom_taskmain2 /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/xcom_base.c:1324
xelabs#6 0x6a278a in Gcs_xcom_proxy_impl::xcom_init(unsigned short, node_address*) /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/gcs_xcom_proxy.cc:164
percona#7 0x59b3c1 in xcom_taskmain_startup /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/gcs_xcom_control_interface.cc:107
percona#8 0x7fc04a2e4dd4 in start_thread (/lib64/libpthread.so.0+0x7dd4)
previously allocated by thread T3 here:
#0 0x7fc04a5d7a88 in __interceptor_calloc (/lib64/libasan.so.4+0xdea88)
#1 0x543604 in mksrv /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/xcom_transport.c:721
xelabs#2 0x543b4c in addsrv /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/xcom_transport.c:755
xelabs#3 0x54af61 in update_servers /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/xcom_transport.c:1747
xelabs#4 0x501082 in site_install_action /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/xcom_base.c:1572
xelabs#5 0x55447c in import_config /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/site_def.c:486
xelabs#6 0x506dfc in handle_x_snapshot /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/xcom_base.c:5257
percona#7 0x50c444 in xcom_fsm /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/xcom_base.c:5325
percona#8 0x516c36 in dispatch_op /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/xcom_base.c:4510
percona#9 0x521997 in acceptor_learner_task /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/xcom_base.c:4772
percona#10 0x562357 in task_loop /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/task.c:1140
percona#11 0x5003b2 in xcom_taskmain2 /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/xcom_base.c:1324
percona#12 0x6a278a in Gcs_xcom_proxy_impl::xcom_init(unsigned short, node_address*) /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/gcs_xcom_proxy.cc:164
percona#13 0x59b3c1 in xcom_taskmain_startup /home/tvale/mysql/plugin/group_replication/libmysqlgcs/src/bindings/xcom/gcs_xcom_control_interface.cc:107
percona#14 0x7fc04a2e4dd4 in start_thread (/lib64/libpthread.so.0+0x7dd4)
Analysis
========================================================================
The server structure is reference counted by the associated sender_task
and reply_handler_task.
When they finish, they unreference the server, which leads to its memory
being freed.
However, the acceptor_learner_task keeps a "naked" reference to the
server structure.
Under the right ordering of operations, i.e. the sender_task and
reply_handler_task terminating after the acceptor_learner_task acquires,
but before it uses, the reference to the server structure, leads to the
acceptor_learner_task accessing the server structure after it has been
freed.
Solution
========================================================================
Let the acceptor_learner_task also reference count the server structure
so it is not freed while still in use.
Reviewed-by: André Negrão <[email protected]>
Reviewed-by: Venkatesh Venugopal <[email protected]>
RB: 21209
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/usr/local/xtrabackup_dir/bin/xtrabackup --defaults-file=/etc/percona-server.conf.d/mysqld.cnf --user=xtrabackup --password=... --datadir=/data/mysql57 --no-timestamp --slave-info --parallel=5 --backup --target-dir=/backup/tokudb_backup
这个备份完成后，xtrab
ackup_slave_info文件是空的
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