[PATCH 2/2] perf tools: Fix hybrid config terms list corruption
From: Adrian Hunter
Date: Thu Sep 09 2021 - 09:20:24 EST
A config terms list was spliced twice, resulting in a never-ending loop
when the list was traversed. Fix by using list_splice_init() and copying
and freeing the lists as necessary.
This patch also depends on patch "perf tools: Factor out
copy_config_terms() and free_config_terms()"
Example on ADL:
Before:
# perf record -e '{intel_pt//,cycles/aux-sample-size=4096/pp}' uname &
# jobs
[1]+ Running perf record -e "{intel_pt//,cycles/aux-sample-size=4096/pp}" uname
# perf top -E 10
PerfTop: 4071 irqs/sec kernel: 6.9% exact: 100.0% lost: 0/0 drop: 0/0 [4000Hz cycles], (all, 24 CPUs)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
97.60% perf [.] __evsel__get_config_term
0.25% [kernel] [k] kallsyms_expand_symbol.constprop.13
0.24% perf [.] kallsyms__parse
0.15% [kernel] [k] _raw_spin_lock
0.14% [kernel] [k] number
0.13% [kernel] [k] advance_transaction
0.08% [kernel] [k] format_decode
0.08% perf [.] map__process_kallsym_symbol
0.08% perf [.] rb_insert_color
0.08% [kernel] [k] vsnprintf
exiting.
# kill %1
After:
# perf record -e '{intel_pt//,cycles/aux-sample-size=4096/pp}' uname &
Linux
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.060 MB perf.data ]
# perf script | head
perf-exec 604 [001] 1827.312293: psb: psb offs: 0 ffffffffb8415e87 pt_config_start+0x37 ([kernel.kallsyms])
perf-exec 604 1827.312293: 1 branches: ffffffffb856a3bd event_sched_in.isra.133+0xfd ([kernel.kallsyms]) => ffffffffb856a9a0 perf_pmu_nop_void+0x0 ([kernel.kallsyms])
perf-exec 604 1827.312293: 1 branches: ffffffffb856b10e merge_sched_in+0x26e ([kernel.kallsyms]) => ffffffffb856a2c0 event_sched_in.isra.133+0x0 ([kernel.kallsyms])
perf-exec 604 1827.312293: 1 branches: ffffffffb856a45d event_sched_in.isra.133+0x19d ([kernel.kallsyms]) => ffffffffb8568b80 perf_event_set_state.part.61+0x0 ([kernel.kallsyms])
perf-exec 604 1827.312293: 1 branches: ffffffffb8568b86 perf_event_set_state.part.61+0x6 ([kernel.kallsyms]) => ffffffffb85662a0 perf_event_update_time+0x0 ([kernel.kallsyms])
perf-exec 604 1827.312293: 1 branches: ffffffffb856a35c event_sched_in.isra.133+0x9c ([kernel.kallsyms]) => ffffffffb8567610 perf_log_itrace_start+0x0 ([kernel.kallsyms])
perf-exec 604 1827.312293: 1 branches: ffffffffb856a377 event_sched_in.isra.133+0xb7 ([kernel.kallsyms]) => ffffffffb8403b40 x86_pmu_add+0x0 ([kernel.kallsyms])
perf-exec 604 1827.312293: 1 branches: ffffffffb8403b86 x86_pmu_add+0x46 ([kernel.kallsyms]) => ffffffffb8403940 collect_events+0x0 ([kernel.kallsyms])
perf-exec 604 1827.312293: 1 branches: ffffffffb8403a7b collect_events+0x13b ([kernel.kallsyms]) => ffffffffb8402cd0 collect_event+0x0 ([kernel.kallsyms])
Fixes: 94da591b1c7913 ("perf parse-events: Create two hybrid raw events")
Fixes: 9cbfa2f64c04d9 ("perf parse-events: Create two hybrid hardware events")
Fixes: 30def61f64bac5 ("perf parse-events: Create two hybrid cache events")
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
---
tools/perf/util/parse-events-hybrid.c | 18 +++++++++++++++---
tools/perf/util/parse-events.c | 18 ++++++++++++------
2 files changed, 27 insertions(+), 9 deletions(-)
diff --git a/tools/perf/util/parse-events-hybrid.c b/tools/perf/util/parse-events-hybrid.c
index 10160ab126f9..b234d95fb10a 100644
--- a/tools/perf/util/parse-events-hybrid.c
+++ b/tools/perf/util/parse-events-hybrid.c
@@ -76,12 +76,16 @@ static int add_hw_hybrid(struct parse_events_state *parse_state,
int ret;
perf_pmu__for_each_hybrid_pmu(pmu) {
+ LIST_HEAD(terms);
+
if (pmu_cmp(parse_state, pmu))
continue;
+ copy_config_terms(&terms, config_terms);
ret = create_event_hybrid(PERF_TYPE_HARDWARE,
&parse_state->idx, list, attr, name,
- config_terms, pmu);
+ &terms, pmu);
+ free_config_terms(&terms);
if (ret)
return ret;
}
@@ -115,11 +119,15 @@ static int add_raw_hybrid(struct parse_events_state *parse_state,
int ret;
perf_pmu__for_each_hybrid_pmu(pmu) {
+ LIST_HEAD(terms);
+
if (pmu_cmp(parse_state, pmu))
continue;
+ copy_config_terms(&terms, config_terms);
ret = create_raw_event_hybrid(&parse_state->idx, list, attr,
- name, config_terms, pmu);
+ name, &terms, pmu);
+ free_config_terms(&terms);
if (ret)
return ret;
}
@@ -165,11 +173,15 @@ int parse_events__add_cache_hybrid(struct list_head *list, int *idx,
*hybrid = true;
perf_pmu__for_each_hybrid_pmu(pmu) {
+ LIST_HEAD(terms);
+
if (pmu_cmp(parse_state, pmu))
continue;
+ copy_config_terms(&terms, config_terms);
ret = create_event_hybrid(PERF_TYPE_HW_CACHE, idx, list,
- attr, name, config_terms, pmu);
+ attr, name, &terms, pmu);
+ free_config_terms(&terms);
if (ret)
return ret;
}
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index ded5808798f9..51a2219df601 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -387,7 +387,7 @@ __add_event(struct list_head *list, int *idx,
evsel->name = strdup(name);
if (config_terms)
- list_splice(config_terms, &evsel->config_terms);
+ list_splice_init(config_terms, &evsel->config_terms);
if (list)
list_add_tail(&evsel->core.node, list);
@@ -535,9 +535,12 @@ int parse_events_add_cache(struct list_head *list, int *idx,
config_name ? : name, &config_terms,
&hybrid, parse_state);
if (hybrid)
- return ret;
+ goto out_free_terms;
- return add_event(list, idx, &attr, config_name ? : name, &config_terms);
+ ret = add_event(list, idx, &attr, config_name ? : name, &config_terms);
+out_free_terms:
+ free_config_terms(&config_terms);
+ return ret;
}
static void tracepoint_error(struct parse_events_error *e, int err,
@@ -1457,10 +1460,13 @@ int parse_events_add_numeric(struct parse_events_state *parse_state,
get_config_name(head_config),
&config_terms, &hybrid);
if (hybrid)
- return ret;
+ goto out_free_terms;
- return add_event(list, &parse_state->idx, &attr,
- get_config_name(head_config), &config_terms);
+ ret = add_event(list, &parse_state->idx, &attr,
+ get_config_name(head_config), &config_terms);
+out_free_terms:
+ free_config_terms(&config_terms);
+ return ret;
}
int parse_events_add_tool(struct parse_events_state *parse_state,
--
2.17.1