sched_out_state() converts the prev_state u64 bitmask to a char in a wrong way, which may cause invalid memory access. TASK_STATE_TO_CHAR_STR should also be fixed to adapt current kernel's sched.h.
Signed-off-by: Tomoki Sekiyama <tomoki.sekiyama...@hitachi.com> Cc: Jiri Olsa <jo...@kernel.org> Cc: David Ahern <dsah...@gmail.com> Cc: Namhyung Kim <namhy...@kernel.org> Cc: Peter Zijlstra <a.p.zijls...@chello.nl> Cc: Masami Hiramatsu <mhira...@kernel.org> --- tools/perf/builtin-sched.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c index 0dfe8df..5776263 100644 --- a/tools/perf/builtin-sched.c +++ b/tools/perf/builtin-sched.c @@ -70,7 +70,7 @@ struct sched_atom { struct task_desc *wakee; }; -#define TASK_STATE_TO_CHAR_STR "RSDTtZXxKWP" +#define TASK_STATE_TO_CHAR_STR "RSDTtXZxKWPNn" enum thread_state { THREAD_SLEEPING = 0, @@ -897,9 +897,10 @@ static int thread_atoms_insert(struct perf_sched *sched, struct thread *thread) static char sched_out_state(u64 prev_state) { - const char *str = TASK_STATE_TO_CHAR_STR; + const char str[] = TASK_STATE_TO_CHAR_STR; + unsigned int bit = prev_state ? __ffs(prev_state) + 1 : 0; - return str[prev_state]; + return bit < ARRAY_SIZE(str) - 1 ? str[bit] : '?'; } static int -- 2.7.4