From: Jeff Mahoney <jeffm@xxxxxxxx> When we're using pipe input, we don't track online CPUs and don't have a cpu_map. When we start to show entries, check_sequence will be invoked. If the first entry isn't sequence 1 (perhaps it's been dropped?), we'll proceed to check_cpu_map. Since we haven't tracked online CPUs, pdi->cpu_map_max will be 0 and we'll do a malloc(0). Then we'll start setting bits corresponding to CPU numbers in memory we don't own. Since there's nothing to check here, let's skip it on pipe input. Signed-off-by: Jeff Mahoney <jeffm@xxxxxxxx> --- blkparse.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/blkparse.c b/blkparse.c index f88204a..498857c 100644 --- a/blkparse.c +++ b/blkparse.c @@ -2229,6 +2229,10 @@ static int check_cpu_map(struct per_dev_info *pdi) unsigned int i; int ret, cpu; + /* Pipe input doesn't do CPU online tracking. */ + if (!pdi->cpu_map_max) + return 0; + /* * create a map of the cpus we have traces for */ -- 2.33.1
