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      1. rr record -h randomizes number of processors:

      {10.5} midenok@dull:build$ rr record -h nproc
      rr: Saving execution to trace directory `/home/midenok/.local/share/rr/nproc-0'.
      8
      {10.5} midenok@dull:build$ rr record -h nproc
      rr: Saving execution to trace directory `/home/midenok/.local/share/rr/nproc-1'.
      6
      {10.5} midenok@dull:build$ rr record -h nproc
      rr: Saving execution to trace directory `/home/midenok/.local/share/rr/nproc-2'.
      3
      {10.5} midenok@dull:build$ rr record -h nproc
      rr: Saving execution to trace directory `/home/midenok/.local/share/rr/nproc-3'.
      5
      

      mtr option --rr --rr-arg=-h produces check-testcase failure:

      --- /dev/shm/10.5m/mysql-test/var/2/tmp/check-mysqld_1.result	2020-09-17 12:39:40.051012859 +0300
      +++ /dev/shm/10.5m/mysql-test/var/2/tmp/check-mysqld_1.reject	2020-09-17 12:42:01.852733184 +0300
      @@ -646,7 +646,7 @@
       THREAD_POOL_OVERSUBSCRIBE	3
       THREAD_POOL_PRIORITY	auto
       THREAD_POOL_PRIO_KICKUP_TIMER	1000
      -THREAD_POOL_SIZE	7
      +THREAD_POOL_SIZE	2
       THREAD_POOL_STALL_LIMIT	500
       THREAD_STACK	299008
       TIME_FORMAT	%H:%i:%s
      

      The simplest fix could be just apply --no-check-testcases for --rr.

      The another fix is to disable THREAD_POOL_SIZE variable for check-test case here:

      mtr_check.sql

        SELECT * FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
          WHERE variable_name NOT IN ('timestamp')
           AND variable_name not like "Last_IO_Err*"
           AND variable_name != 'INNODB_IBUF_MAX_SIZE'
           AND variable_name != 'INNODB_USE_NATIVE_AIO'
           AND variable_name != 'INNODB_BUFFER_POOL_LOAD_AT_STARTUP'
           AND variable_name not like 'GTID%POS'
           AND variable_name != 'GTID_BINLOG_STATE'
         ORDER BY variable_name;
      

      2. check for `perf_event_paranoid = 1` for user-friendly error message.

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              Assignee:
              midenok Aleksey Midenkov
              Reporter:
              midenok Aleksey Midenkov
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                Created:
                Updated:
                Resolved: