Re: SIGSEGV on perf's 'Basic parsing test'

[Namhyung Kim <namhyung@kernel.org>]

On Fri, Nov 22, 2024 at 10:49:31PM +0100, Guilherme Amadio wrote:
> Dear Arnaldo, Namhyung, Ian,
> 
> I noticed that on perf-tools-next, some new tests fail on my machine
> with a segmentation fault. I am on perf-tools-next at the following
> commit: 85c60a01b85ee956adf8d46c253fc50f75363e8f.

I've added a couple of fixes for the HWMON tests.  Can you please test
it again with the latest branch?

Thanks,
Namhyung

> 
> After compiling perf with DEBUG=1 and running the test on gdb, this is
> the stack trace that I get from the crash:
> 
> Reading symbols from ./perf...
> (gdb) run
> Starting program: /home/amadio/src/linux/tools/perf/perf test -F 11
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/usr/lib64/libthread_db.so.1".
>  11.1: Basic parsing test                                            : Ok
> event syntax error: 'temp_test_hwmon_event1'
>                      \___ Bad event name
> 
> Unable to find event on a PMU of 'temp_test_hwmon_event1'
> 
> Program received signal SIGSEGV, Segmentation fault.
> __GI___libc_free (mem=0x1c0b4908070c0a7a) at malloc.c:3375
> 3375      if (chunk_is_mmapped (p))                       /* release mmapped memory. */
> (gdb) bt
> #0  __GI___libc_free (mem=0x1c0b4908070c0a7a) at malloc.c:3375
> #1  0x000055555564fbc8 in __zfree (ptr=0x7ffff6c00031) at ../../lib/zalloc.c:13
> #2  0x000055555581997c in evsel__free_stat_priv (evsel=0x5555560d8ca0) at util/stat.c:148
> #3  0x0000555555819c90 in evlist__free_stats (evlist=0x5555560d7d30) at util/stat.c:215
> #4  0x000055555575d0dc in evlist__delete (evlist=0x5555560d7d30) at util/evlist.c:187
> #5  0x00005555557124d9 in do_test (i=0, with_pmu=false, with_alias=false) at tests/hwmon_pmu.c:198
> #6  0x0000555555712587 in test__hwmon_pmu (with_pmu=false) at tests/hwmon_pmu.c:212
> #7  0x000055555571263b in test__hwmon_pmu_without_pmu (test=0x55555605ae40 <suite.hwmon_pmu>, subtest=1) at tests/hwmon_pmu.c:229
> #8  0x00005555556c8e9d in start_test (test=0x55555605ae40 <suite.hwmon_pmu>, i=10, subi=1, child=0x5555560d7818, width=64, pass=1) at tests/builtin-test.c:424
> #9  0x00005555556c9588 in __cmd_test (suites=0x5555560d73e0, argc=1, argv=0x7fffffffe200, skiplist=0x0) at tests/builtin-test.c:571
> #10 0x00005555556ca0b5 in cmd_test (argc=1, argv=0x7fffffffe200) at tests/builtin-test.c:773
> #11 0x0000555555645459 in run_builtin (p=0x555556047050 <commands+624>, argc=3, argv=0x7fffffffe200) at perf.c:351
> #12 0x0000555555645704 in handle_internal_command (argc=3, argv=0x7fffffffe200) at perf.c:404
> #13 0x0000555555645865 in run_argv (argcp=0x7fffffffe00c, argv=0x7fffffffe000) at perf.c:448
> #14 0x0000555555645bb6 in main (argc=3, argv=0x7fffffffe200) at perf.c:560
> (gdb) quit
> 
> 
> Please let me know what other information you'd like to have from my system.
> The CPU is an AMD 3950X and the motherboard is an ASUS Pro WS X570-ACE if that
> helps.
> 
> $ uname -a
> Linux gentoo.cern.ch 6.12.0-gentoo #1 SMP PREEMPT_DYNAMIC Mon Nov 18 16:50:03 CET 2024 x86_64 AMD Ryzen 9 3950X 16-Core Processor AuthenticAMD GNU/Linux
> $ dmesg | sed -ne '/DMI/{p; q}'
> [    0.000000] DMI: ASUS System Product Name/Pro WS X570-ACE, BIOS 4902 08/29/2024
> 
> Best regards,
> -Guilherme
>