On Wed, Aug 02, 2017 at 08:37:35AM -0400, Dave Jones wrote: > On Wed, Aug 02, 2017 at 11:09:21AM +0800, Dai Xiang wrote: > > > root@local ~# cat /proc/30504/stack > > [<ffffffff8122b5ac>] wb_wait_for_completion+0x5c/0x90 > > [<ffffffff8122ed26>] sync_inodes_sb+0x96/0x200 > > [<ffffffff81235135>] sync_inodes_one_sb+0x15/0x20 > > [<ffffffff81204913>] iterate_supers+0xc3/0x120 > > [<ffffffff81235455>] sys_sync+0x35/0x90 > > [<ffffffff818fd39e>] tracesys_phase2+0x84/0x89 > > [<ffffffffffffffff>] 0xffffffffffffffff > > Ah. You might just have a *lot* of dirty pages to write out. > Does iotop show that journald is writing ? I do test again and only echo pid without kill pid but killall -9 trinity: nobody 29553 0.0 0.4 55288 33212 pts/0 SL 09:42 0:00 trinity -q -q -l off -s -x get_robust_list -x remap_file_pages -N 999999999 nobody 30107 0.0 0.3 56360 28308 ? Ds 09:51 0:00 trinity -q -q -l off -s -x get_robust_list -x remap_file_pages -N 999999999 nobody 30109 0.0 0.4 55608 34932 ? DNLs 09:51 0:00 trinity -q -q -l off -s -x get_robust_list -x remap_file_pages -N 999999999 nobody 30110 0.0 0.3 55424 30156 ? Ds 09:51 0:00 trinity -q -q -l off -s -x get_robust_list -x remap_file_pages -N 999999999 nobody 30111 0.0 0.4 55464 32788 ? DNs 09:51 0:00 trinity -q -q -l off -s -x get_robust_list -x remap_file_pages -N 999999999 nobody 30114 0.0 0.4 56584 32792 ? Ds 09:51 0:00 trinity -q -q -l off -s -x get_robust_list -x remap_file_pages -N 999999999 nobody 30161 0.0 0.2 55464 23704 ? Ds 09:51 0:00 trinity -q -q -l off -s -x get_robust_list -x remap_file_pages -N 999999999 nobody 30165 0.0 0.3 58564 30568 ? DNs 09:51 0:00 trinity -q -q -l off -s -x get_robust_list -x remap_file_pages -N 999999999 nobody 30186 0.0 0.1 55436 14984 ? Ds 09:51 0:00 trinity -q -q -l off -s -x get_robust_list -x remap_file_pages -N 999999999 The 29553 is printed but killall failed: $ killall -9 trinity trinity: no process found use pstree: |-trinity-main -q -q -l off -s 3648957937 -x get_robust_list -x remap_file_pages -N 999999999 | |-trinity-c0 -q -q -l off -s 3648957937 -x get_robust_list -x remap_file_pages -N 999999999 | |-trinity-c1 -q -q -l off -s 3648957937 -x get_robust_list -x remap_file_pages -N 999999999 | |-trinity-c2 -q -q -l off -s 3648957937 -x get_robust_list -x remap_file_pages -N 999999999 | |-trinity-c3 -q -q -l off -s 3648957937 -x get_robust_list -x remap_file_pages -N 999999999 | |-trinity-c4 -q -q -l off -s 3648957937 -x get_robust_list -x remap_file_pages -N 999999999 | |-trinity-c5 -q -q -l off -s 3648957937 -x get_robust_list -x remap_file_pages -N 999999999 | |-trinity-c6 -q -q -l off -s 3648957937 -x get_robust_list -x remap_file_pages -N 999999999 | `-trinity-c7 -q -q -l off -s 3648957937 -x get_robust_list -x remap_file_pages -N 999999999 use iotop -o: 111 be/4 root 0.00 B/s 0.00 B/s 0.00 % 99.99 % [kworker/0:2] <== sometime kworker/1:1 or so on sometimes more processes called kworker run, do not find trinity. Thanks Xiang > If IO is progressing, it's not a bug. If it's completely idle, and we're > still stuck here, that's a kernel bug. > > Unless you're particularly focussed on stressing filesystems, you might > want to skip the sync related syscalls (fsync,fdatasync,sync,syncfs) How can i skip those syscalls? > > Dave > -- To unsubscribe from this list: send the line "unsubscribe trinity" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
