perf list dumps core using 5.13.0.rc2

[Thomas Richter <tmricht@linux.ibm.com>]

Using kernel 5.13.0.rc2 command perf list dumps core on my x86
virtual machine:

[root@f34 perf]# ./perf list
Segmentation fault (core dumped)
^C
[root@f34 perf]#

The root case this this change in file ../include/uapi/linux/perf_event.h:
enum perf_sw_ids {
        PERF_COUNT_SW_CPU_CLOCK                 = 0,
        ...
 --->   PERF_COUNT_SW_CGROUP_SWITCHES           = 11,

        PERF_COUNT_SW_MAX,                      /* non-ABI */
};

This change increases PERF_COUNT_SW_MAX to 12. However this
change is not reflected in file util/parse-events.c where data structure

struct event_symbol event_symbols_sw[PERF_COUNT_SW_MAX] = {
        ....
}

is defined and it misses the symbol name and alias for this new software
event. So when command 'perf list' is called, the call chain sequence
is
  cmd_list()
    print_events()
      print_symbol_events(event_glob, PERF_TYPE_SOFTWARE,
                          event_symbols_sw, PERF_COUNT_SW_MAX, name_only);

where PERF_COUNT_SW_MAX is 12 and  structure event_symbols_sw[] contains
only 11 elements. This ends up with the last element of the array being
all zeroes and the line:

    if (!name_only && strlen(syms->alias))

dumps core because syms->alias is a NULL pointer.

Is this dummy event PERF_COUNT_SW_CGROUP_SWITCHES simply missing in the
event_symbols_sw[] array or is there more to it (which I am missing).

Thanks. 

PS: I can sent a patch if needed....

-- 
Thomas Richter, Dept 3303, IBM s390 Linux Development, Boeblingen, Germany
--
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