Some processors have 8 general purpose counters

[soramichi]

Some processors have 8 general purpose counters and 3 fixed counters, so the total would be 11.
The current code allocates data buffer only for 7 (4 + 3) counters, resulting in a SEGV on these processors.

$ cat /proc/cpuinfo | grep 'model name' | uniq
model name	: Intel(R) Xeon(R) CPU E5-1603 v4 @ 2.80GHz

$ sudo ./pcm-core.x 
Number of physical cores: 4
Number of logical cores: 4
Number of online logical cores: 4
Threads (logical cores) per physical core: 1
Num sockets: 1
Physical cores per socket: 4
Core PMU (perfmon) version: 3
Number of core PMU generic (programmable) counters: 8
Width of generic (programmable) counters: 48 bits
Number of core PMU fixed counters: 3
Width of fixed counters: 48 bits
...

[opcm]

which src+line does it crash?

[soramichi]

In my environment, pcm-core.x crashes at line 3100 of cpucounters.cpp (where perfData is destructed) because m->readPerfData(..., perfData) at line 3092 writes 11 * 8 bytes of data to perfData whose length is only 7 * 8.

This may not be repreducible in some envs because buffer overruns do not necessarily cause the same fault in any envs but the phenomenon rather depends on the compiler/libc/kernel version. I use gcc 6.3.0 on Debian stable (stretch).

[opcm]

thanks!