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Date: Thu, 2 Jan 2020 23:26:41 +0800
From: Leo Yan <leo.yan@...aro.org>
To: Arnaldo Carvalho de Melo <acme@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org,
Mathieu Poirier <mathieu.poirier@...aro.org>,
Mike Leach <mike.leach@...aro.org>,
Suzuki K Poulose <suzuki.poulose@....com>
Subject: Re: [PATCH] perf parse: Copy string to perf_evsel_config_term
On Thu, Jan 02, 2020 at 11:13:26PM +0800, Leo Yan wrote:
> perf with CoreSight fails to record trace data with command:
>
> perf record -e cs_etm/@..._etr0/u --per-thread ls
> failed to set sink "" on event cs_etm/@..._etr0/u with 21 (Is a
> directory)/perf/
>
> This failure is root caused with the commit 1dc925568f01 ("perf
> parse: Add a deep delete for parse event terms").
>
> The log shows, cs_etm fails to parse the sink attribution; cs_etm event
> relies on the event configuration to pass sink name, but the event
> specific configuration data cannot be passed properly with flow:
>
> get_config_terms()
> ADD_CONFIG_TERM(DRV_CFG, drv_cfg, term->val.str);
> __t->val.drv_cfg = term->val.str;
> `> __t->val.drv_cfg is assigned to term->val.str;
>
> parse_events_terms__purge()
> parse_events_term__delete()
> zfree(&term->val.str);
> `> term->val.str is freed and assigned to NULL pointer;
>
> cs_etm_set_sink_attr()
> sink = __t->val.drv_cfg;
> `> sink string has been freed.
>
> To fix this issue, in the function get_config_terms(), this patch
> changes from directly assignment pointer value for the strings to
> use strdup() for allocation a new duplicate string for the cases:
>
> perf_evsel_config_term::val.callgraph
> perf_evsel_config_term::val.branch
> perf_evsel_config_term::val.drv_cfg.
>
> Fixes: 1dc925568f01 ("perf parse: Add a deep delete for parse event terms")
> Signed-off-by: Leo Yan <leo.yan@...aro.org>
Let me to loop Mathieu/Mike/Suzuki, sorry for spamming.
Thanks,
Leo
> ---
> tools/perf/util/parse-events.c | 49 ++++++++++++++++++++--------------
> 1 file changed, 29 insertions(+), 20 deletions(-)
>
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index ed7c008b9c8b..5972acdd40d6 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -1220,7 +1220,6 @@ static int get_config_terms(struct list_head *head_config,
> struct list_head *head_terms __maybe_unused)
> {
> #define ADD_CONFIG_TERM(__type, __name, __val) \
> -do { \
> struct perf_evsel_config_term *__t; \
> \
> __t = zalloc(sizeof(*__t)); \
> @@ -1229,9 +1228,19 @@ do { \
> \
> INIT_LIST_HEAD(&__t->list); \
> __t->type = PERF_EVSEL__CONFIG_TERM_ ## __type; \
> - __t->val.__name = __val; \
> __t->weak = term->weak; \
> - list_add_tail(&__t->list, head_terms); \
> + list_add_tail(&__t->list, head_terms)
> +
> +#define ADD_CONFIG_TERM_VAL(__type, __name, __val) \
> +do { \
> + ADD_CONFIG_TERM(__type, __name, __val); \
> + __t->val.__name = __val; \
> +} while (0)
> +
> +#define ADD_CONFIG_TERM_STR(__type, __name, __val) \
> +do { \
> + ADD_CONFIG_TERM(__type, __name, __val); \
> + __t->val.__name = strdup(__val); \
> } while (0)
>
> struct parse_events_term *term;
> @@ -1239,53 +1248,53 @@ do { \
> list_for_each_entry(term, head_config, list) {
> switch (term->type_term) {
> case PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD:
> - ADD_CONFIG_TERM(PERIOD, period, term->val.num);
> + ADD_CONFIG_TERM_VAL(PERIOD, period, term->val.num);
> break;
> case PARSE_EVENTS__TERM_TYPE_SAMPLE_FREQ:
> - ADD_CONFIG_TERM(FREQ, freq, term->val.num);
> + ADD_CONFIG_TERM_VAL(FREQ, freq, term->val.num);
> break;
> case PARSE_EVENTS__TERM_TYPE_TIME:
> - ADD_CONFIG_TERM(TIME, time, term->val.num);
> + ADD_CONFIG_TERM_VAL(TIME, time, term->val.num);
> break;
> case PARSE_EVENTS__TERM_TYPE_CALLGRAPH:
> - ADD_CONFIG_TERM(CALLGRAPH, callgraph, term->val.str);
> + ADD_CONFIG_TERM_STR(CALLGRAPH, callgraph, term->val.str);
> break;
> case PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE:
> - ADD_CONFIG_TERM(BRANCH, branch, term->val.str);
> + ADD_CONFIG_TERM_STR(BRANCH, branch, term->val.str);
> break;
> case PARSE_EVENTS__TERM_TYPE_STACKSIZE:
> - ADD_CONFIG_TERM(STACK_USER, stack_user, term->val.num);
> + ADD_CONFIG_TERM_VAL(STACK_USER, stack_user, term->val.num);
> break;
> case PARSE_EVENTS__TERM_TYPE_INHERIT:
> - ADD_CONFIG_TERM(INHERIT, inherit, term->val.num ? 1 : 0);
> + ADD_CONFIG_TERM_VAL(INHERIT, inherit, term->val.num ? 1 : 0);
> break;
> case PARSE_EVENTS__TERM_TYPE_NOINHERIT:
> - ADD_CONFIG_TERM(INHERIT, inherit, term->val.num ? 0 : 1);
> + ADD_CONFIG_TERM_VAL(INHERIT, inherit, term->val.num ? 0 : 1);
> break;
> case PARSE_EVENTS__TERM_TYPE_MAX_STACK:
> - ADD_CONFIG_TERM(MAX_STACK, max_stack, term->val.num);
> + ADD_CONFIG_TERM_VAL(MAX_STACK, max_stack, term->val.num);
> break;
> case PARSE_EVENTS__TERM_TYPE_MAX_EVENTS:
> - ADD_CONFIG_TERM(MAX_EVENTS, max_events, term->val.num);
> + ADD_CONFIG_TERM_VAL(MAX_EVENTS, max_events, term->val.num);
> break;
> case PARSE_EVENTS__TERM_TYPE_OVERWRITE:
> - ADD_CONFIG_TERM(OVERWRITE, overwrite, term->val.num ? 1 : 0);
> + ADD_CONFIG_TERM_VAL(OVERWRITE, overwrite, term->val.num ? 1 : 0);
> break;
> case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE:
> - ADD_CONFIG_TERM(OVERWRITE, overwrite, term->val.num ? 0 : 1);
> + ADD_CONFIG_TERM_VAL(OVERWRITE, overwrite, term->val.num ? 0 : 1);
> break;
> case PARSE_EVENTS__TERM_TYPE_DRV_CFG:
> - ADD_CONFIG_TERM(DRV_CFG, drv_cfg, term->val.str);
> + ADD_CONFIG_TERM_STR(DRV_CFG, drv_cfg, term->val.str);
> break;
> case PARSE_EVENTS__TERM_TYPE_PERCORE:
> - ADD_CONFIG_TERM(PERCORE, percore,
> + ADD_CONFIG_TERM_VAL(PERCORE, percore,
> term->val.num ? true : false);
> break;
> case PARSE_EVENTS__TERM_TYPE_AUX_OUTPUT:
> - ADD_CONFIG_TERM(AUX_OUTPUT, aux_output, term->val.num ? 1 : 0);
> + ADD_CONFIG_TERM_VAL(AUX_OUTPUT, aux_output, term->val.num ? 1 : 0);
> break;
> case PARSE_EVENTS__TERM_TYPE_AUX_SAMPLE_SIZE:
> - ADD_CONFIG_TERM(AUX_SAMPLE_SIZE, aux_sample_size, term->val.num);
> + ADD_CONFIG_TERM_VAL(AUX_SAMPLE_SIZE, aux_sample_size, term->val.num);
> break;
> default:
> break;
> @@ -1322,7 +1331,7 @@ static int get_config_chgs(struct perf_pmu *pmu, struct list_head *head_config,
> }
>
> if (bits)
> - ADD_CONFIG_TERM(CFG_CHG, cfg_chg, bits);
> + ADD_CONFIG_TERM_VAL(CFG_CHG, cfg_chg, bits);
>
> #undef ADD_CONFIG_TERM
> return 0;
> --
> 2.17.1
>
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