perf trace: Register a thread priv destructor

To plug these leaks detected with:

  $ make EXTRA_CFLAGS="-fsanitize=address" BUILD_BPF_SKEL=1 CORESIGHT=1 O=/tmp/build/perf-tools-next -C tools/perf install-bin

  =================================================================
  ==473890==ERROR: LeakSanitizer: detected memory leaks

  Direct leak of 112 byte(s) in 1 object(s) allocated from:
    #0 0x7fdf19aba097 in calloc (/lib64/libasan.so.8+0xba097)
    SamirMulani#1 0x987836 in zalloc (/home/acme/bin/perf+0x987836)
    SamirMulani#2 0x5367ae in thread_trace__new /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:1289
    SamirMulani#3 0x5367ae in thread__trace /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:1307
    SamirMulani#4 0x5367ae in trace__sys_exit /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:2468
    SamirMulani#5 0x52bf34 in trace__handle_event /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:3177
    SamirMulani#6 0x52bf34 in __trace__deliver_event /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:3685
    SamirMulani#7 0x542927 in trace__deliver_event /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:3712
    SamirMulani#8 0x542927 in trace__run /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:4055
    SamirMulani#9 0x542927 in cmd_trace /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:5141
    SamirMulani#10 0x5ef1a2 in run_builtin /home/acme/git/perf-tools-next/tools/perf/perf.c:323
    SamirMulani#11 0x4196da in handle_internal_command /home/acme/git/perf-tools-next/tools/perf/perf.c:377
    SamirMulani#12 0x4196da in run_argv /home/acme/git/perf-tools-next/tools/perf/perf.c:421
    SamirMulani#13 0x4196da in main /home/acme/git/perf-tools-next/tools/perf/perf.c:537
    torvalds#14 0x7fdf18a4a50f in __libc_start_call_main (/lib64/libc.so.6+0x2750f)

  Direct leak of 2048 byte(s) in 1 object(s) allocated from:
    #0 0x7f788fcba6af in __interceptor_malloc (/lib64/libasan.so.8+0xba6af)
    SamirMulani#1 0x5337c0 in trace__sys_enter /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:2342
    SamirMulani#2 0x52bfb4 in trace__handle_event /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:3191
    SamirMulani#3 0x52bfb4 in __trace__deliver_event /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:3699
    SamirMulani#4 0x542883 in trace__deliver_event /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:3726
    SamirMulani#5 0x542883 in trace__run /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:4069
    SamirMulani#6 0x542883 in cmd_trace /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:5155
    SamirMulani#7 0x5ef232 in run_builtin /home/acme/git/perf-tools-next/tools/perf/perf.c:323
    SamirMulani#8 0x4196da in handle_internal_command /home/acme/git/perf-tools-next/tools/perf/perf.c:377
    SamirMulani#9 0x4196da in run_argv /home/acme/git/perf-tools-next/tools/perf/perf.c:421
    SamirMulani#10 0x4196da in main /home/acme/git/perf-tools-next/tools/perf/perf.c:537
    SamirMulani#11 0x7f788ec4a50f in __libc_start_call_main (/lib64/libc.so.6+0x2750f)

  Indirect leak of 48 byte(s) in 1 object(s) allocated from:
    #0 0x7fdf19aba6af in __interceptor_malloc (/lib64/libasan.so.8+0xba6af)
    SamirMulani#1 0x77b335 in intlist__new util/intlist.c:116
    SamirMulani#2 0x5367fd in thread_trace__new /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:1293
    SamirMulani#3 0x5367fd in thread__trace /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:1307
    SamirMulani#4 0x5367fd in trace__sys_exit /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:2468
    SamirMulani#5 0x52bf34 in trace__handle_event /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:3177
    SamirMulani#6 0x52bf34 in __trace__deliver_event /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:3685
    SamirMulani#7 0x542927 in trace__deliver_event /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:3712
    SamirMulani#8 0x542927 in trace__run /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:4055
    SamirMulani#9 0x542927 in cmd_trace /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:5141
    SamirMulani#10 0x5ef1a2 in run_builtin /home/acme/git/perf-tools-next/tools/perf/perf.c:323
    SamirMulani#11 0x4196da in handle_internal_command /home/acme/git/perf-tools-next/tools/perf/perf.c:377
    SamirMulani#12 0x4196da in run_argv /home/acme/git/perf-tools-next/tools/perf/perf.c:421
    SamirMulani#13 0x4196da in main /home/acme/git/perf-tools-next/tools/perf/perf.c:537
    torvalds#14 0x7fdf18a4a50f in __libc_start_call_main (/lib64/libc.so.6+0x2750f)

Acked-by: Ian Rogers <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Link: https://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

tools/perf/builtin-trace.c

@@ -1296,6 +1296,19 @@ static struct thread_trace *thread_trace__new(void)
 	return ttrace;
 }
 
+static void thread_trace__delete(void *pttrace)
+{
+	struct thread_trace *ttrace = pttrace;
+
+	if (!ttrace)
+		return;
+
+	intlist__delete(ttrace->syscall_stats);
+	ttrace->syscall_stats = NULL;
+	zfree(&ttrace->entry_str);
+	free(ttrace);
+}
+
 static struct thread_trace *thread__trace(struct thread *thread, FILE *fp)
 {
 	struct thread_trace *ttrace;
@@ -1635,6 +1648,8 @@ static int trace__symbols_init(struct trace *trace, struct evlist *evlist)
 	if (trace->host == NULL)
 		return -ENOMEM;
 
+	thread__set_priv_destructor(thread_trace__delete);
+
 	err = trace_event__register_resolver(trace->host, trace__machine__resolve_kernel_addr);
 	if (err < 0)
 		goto out;