The mmap event buffer may end up in a location that violates the alignment requirements for a NEON vector load, which GCC generates to load consecutive values from the event structure. Fix this by copying the event structure into a properly aligned buffer.
Signed-off-by: Lucas Stach <[email protected]> --- tools/perf/util/machine.c | 29 ++++++++++++++++------------- 1 file changed, 16 insertions(+), 13 deletions(-) diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c index 143f7057d581..ab5500e85173 100644 --- a/tools/perf/util/machine.c +++ b/tools/perf/util/machine.c @@ -1565,37 +1565,40 @@ static int machine__process_kernel_mmap_event(struct machine *machine, } int machine__process_mmap2_event(struct machine *machine, - union perf_event *event, + union perf_event *event_in, struct perf_sample *sample) { + union perf_event event; struct thread *thread; struct map *map; int ret = 0; + memcpy(&event, event_in, sizeof(union perf_event)); + if (dump_trace) - perf_event__fprintf_mmap2(event, stdout); + perf_event__fprintf_mmap2(&event, stdout); if (sample->cpumode == PERF_RECORD_MISC_GUEST_KERNEL || sample->cpumode == PERF_RECORD_MISC_KERNEL) { - ret = machine__process_kernel_mmap_event(machine, event); + ret = machine__process_kernel_mmap_event(machine, &event); if (ret < 0) goto out_problem; return 0; } - thread = machine__findnew_thread(machine, event->mmap2.pid, - event->mmap2.tid); + thread = machine__findnew_thread(machine, event.mmap2.pid, + event.mmap2.tid); if (thread == NULL) goto out_problem; - map = map__new(machine, event->mmap2.start, - event->mmap2.len, event->mmap2.pgoff, - event->mmap2.maj, - event->mmap2.min, event->mmap2.ino, - event->mmap2.ino_generation, - event->mmap2.prot, - event->mmap2.flags, - event->mmap2.filename, thread); + map = map__new(machine, event.mmap2.start, + event.mmap2.len, event.mmap2.pgoff, + event.mmap2.maj, + event.mmap2.min, event.mmap2.ino, + event.mmap2.ino_generation, + event.mmap2.prot, + event.mmap2.flags, + event.mmap2.filename, thread); if (map == NULL) goto out_problem_map; -- 2.20.1
