Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Fixed
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10.3
Description
The test galera.galera_sst_rsync fails with a SIGSEGV on 10.3 but not later versions on various builders as follows:
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10.3 1e859d4abcfd7e3b2c238e5dc8c909254661082a |
galera.galera_sst_rsync2 'innodb,release' w2 [ fail ]
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Test ended at 2022-03-29 21:26:18
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CURRENT_TEST: galera.galera_sst_rsync2
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sh: line 1: 28830 Segmentation fault /usr/sbin/mysqld --defaults-group-suffix=.2 --defaults-file=/dev/shm/var/2/my.cnf --log-error=/dev/shm/var/tmp/2/galera_wsrep_recover.log --innodb --wsrep-recover > /dev/shm/var/tmp/2/galera_wsrep_recover.log 2>&1
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mysqltest: In included file "./suite/galera/include/galera_wsrep_recover.inc":
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included from ./suite/galera/include/galera_st_kill_slave.inc at line 58:
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included from /usr/share/mysql-test/suite/galera/t/galera_sst_rsync2.test at line 11:
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At line 8: exec of '/usr/sbin/mysqld --defaults-group-suffix=.2 --defaults-file=/dev/shm/var/2/my.cnf --log-error=/dev/shm/var/tmp/2/galera_wsrep_recover.log --innodb --wsrep-recover > /dev/shm/var/tmp/2/galera_wsrep_recover.log 2>&1' failed, error: 35584, status: 139, errno: 2
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Output from before failure:
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Performing --wsrep-recover ...
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Locally, I checked this with rr:
diff --git a/mysql-test/suite/galera/include/galera_wsrep_recover.inc b/mysql-test/suite/galera/include/galera_wsrep_recover.inc
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index aa2f0e2e777..7857a76daf1 100644
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--- a/mysql-test/suite/galera/include/galera_wsrep_recover.inc
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+++ b/mysql-test/suite/galera/include/galera_wsrep_recover.inc
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@@ -5,7 +5,7 @@ if ($wsrep_recover_additional)
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}
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if (!$wsrep_recover_additional)
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{
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---exec $MYSQLD --defaults-group-suffix=.$galera_wsrep_recover_server_id --defaults-file=$MYSQLTEST_VARDIR/my.cnf --log-error=$MYSQL_TMP_DIR/galera_wsrep_recover.log --innodb --wsrep-recover > $MYSQL_TMP_DIR/galera_wsrep_recover.log 2>&1
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+--exec rr record $MYSQLD --defaults-group-suffix=.$galera_wsrep_recover_server_id --defaults-file=$MYSQLTEST_VARDIR/my.cnf --log-error=$MYSQL_TMP_DIR/galera_wsrep_recover.log --innodb --wsrep-recover > $MYSQL_TMP_DIR/galera_wsrep_recover.log 2>&1
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}
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--perl |
mkdir /dev/shm/rr
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_RR_TRACE_DIR=/dev/shm/rr ./mtr galera.galera_sst_rsync
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The code crashes due to a global variable wsrep being dereferenced.
#0 0x000055dcd8f28e63 in wsrep_post_commit (thd=0x7f8f58001618, all=<optimized out>) at /mariadb/10.3/sql/wsrep_hton.cc:158
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158 wsrep->post_rollback(wsrep, &thd->wsrep_ws_handle))
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(rr) p wsrep
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$1 = (wsrep_t *) 0x0
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The only read or write access of that variable during the entire run (according to awatch wsrep) was the crashing statement.