[root@dep-1 myusername]# for pid in `ps aux | grep '_httpd-st' | awk '{ print $2 }'`; do echo $pid; cat /proc/$pid/stack; done
12402
[<ffffffffc09ffeb3>] drbd_flush_workqueue+0x63/0x80 [drbd]
[<ffffffffc09ed2e2>] conn_disconnect+0x102/0x450 [drbd]
[<ffffffffc09ee438>] drbd_receiver+0x1f8/0x780 [drbd]
[<ffffffffc09fc206>] drbd_thread_setup+0xb6/0x1f0 [drbd]
[<ffffffff84ac61f1>] kthread+0xd1/0xe0
[<ffffffff8518dd1d>] ret_from_fork_nospec_begin+0x7/0x21
[<ffffffffffffffff>] 0xffffffffffffffff
12405
[<ffffffff84acc191>] down+0x41/0x50
[<ffffffffc0a1ebe6>] state_change_lock+0x66/0xa0 [drbd]
[<ffffffffc0a253b6>] change_cluster_wide_state+0x46/0x1170 [drbd]
[<ffffffffc0a2686d>] change_cstate_es+0x8d/0xc0 [drbd]
[<ffffffffc09ee2c2>] drbd_receiver+0x82/0x780 [drbd]
[<ffffffffc09fc206>] drbd_thread_setup+0xb6/0x1f0 [drbd]
[<ffffffff84ac61f1>] kthread+0xd1/0xe0
[<ffffffff8518dd1d>] ret_from_fork_nospec_begin+0x7/0x21
[<ffffffffffffffff>] 0xffffffffffffffff
16937
[<ffffffffc09d7f2c>] drbd_worker+0x46c/0x530 [drbd]
[<ffffffffc09fc206>] drbd_thread_setup+0xb6/0x1f0 [drbd]
[<ffffffff84ac61f1>] kthread+0xd1/0xe0
[<ffffffff8518dd1d>] ret_from_fork_nospec_begin+0x7/0x21
[<ffffffffffffffff>] 0xffffffffffffffff
16941
[<ffffffff84acc191>] down+0x41/0x50
[<ffffffffc0a1ebe6>] state_change_lock+0x66/0xa0 [drbd]
[<ffffffffc0a253b6>] change_cluster_wide_state+0x46/0x1170 [drbd]
[<ffffffffc0a2686d>] change_cstate_es+0x8d/0xc0 [drbd]
[<ffffffffc09e4ea1>] connect_work+0x191/0x260 [drbd]
[<ffffffffc09d7821>] drbd_sender+0x181/0x420 [drbd]
[<ffffffffc09fc206>] drbd_thread_setup+0xb6/0x1f0 [drbd]
[<ffffffff84ac61f1>] kthread+0xd1/0xe0
[<ffffffff8518dd1d>] ret_from_fork_nospec_begin+0x7/0x21
[<ffffffffffffffff>] 0xffffffffffffffff
16948
[<ffffffffc09d15c5>] wait_for_sender_todo+0x165/0x2b0 [drbd]
[<ffffffffc09d7945>] drbd_sender+0x2a5/0x420 [drbd]
[<ffffffffc09fc206>] drbd_thread_setup+0xb6/0x1f0 [drbd]
[<ffffffff84ac61f1>] kthread+0xd1/0xe0
[<ffffffff8518dd1d>] ret_from_fork_nospec_begin+0x7/0x21
[<ffffffffffffffff>] 0xffffffffffffffff