save_record_data() uses a wrong index, it generates incorrect trace.dat. Urgent bug, fix it! Signed-off-by: Lai Jiangshan <laijs(a)cn.fujitsu.com&gt; --- diff --git a/extensions/trace.c b/extensions/trace.c index 4b6144f..3bad4af 100755 --- a/extensions/trace.c +++ b/extensions/trace.c @@ -3445,7 +3445,7 @@ static int save_record_data(int fd, int nr_cpu_buffers) continue; for (j = 0; j < cpu_buffer->nr_linear_pages; j++) { - if (ftrace_dump_page(fd, cpu_buffer->linear_pages[i], + if (ftrace_dump_page(fd, cpu_buffer->linear_pages[j], page_tmp) < 0) { free(page_tmp); return -1;