Hi Vu,
That was expected behaviour that IMCN after getting unblocked will process
sig_term event. For this to happen, it has to come out of
IMMDispatch(DISPATCH_ALL). I think IMMND just sends CCB callbacks for atleast
create/delete/modify and complete on one go. For CCB Apply IMMND will have to
wait for completed response which creates a dependency on IMCN. But I this not
synschronous lilke callbacks in other services. So in our test application
which is only one client making conf changes, no problem will occur. However in
case of multiple clients are making CCB changes then IMMND will be sending
these to IMCNand these will be piling up.
Anyways, I do not see much risk but still I would like Minh to clarify the
problem enviornment whether configuration changes are done much faster and by
multiple clients. I have seen in some IMM tickets where reporter was creating
thousands of objects
Yes, by maintaining the flag spawning of mulitple threads can be avoided. But
we need to remember here that maintaining this flag does not block a user to
trigger swtichvers. So per switchover, restart of IMCN may get missed.
Thanks,
Praveen
---
** [tickets:#2219] ntfd: circular dependency with osafntfimcnd**
**Status:** assigned
**Milestone:** 5.0.2
**Created:** Thu Dec 08, 2016 05:14 AM UTC by Gary Lee
**Last Updated:** Mon Dec 12, 2016 08:47 AM UTC
**Owner:** Praveen
A circular dependency can be seen when performing a si-swap of
safSi=SC-2N,safApp=OpenSAF:
1. Active NTFD is trying to sync with Standby using MBC
2. Standby NTFD is the process of terminating its local osafntfimcnd. It is
stuck in timedwait_imcn_exit() and cannot reply to the Active.
3. osafntfimcnd [on standby] is trying to send a notfication to Active NTFD
So we have (1) depending on (2) depending on (3) depending on (1)
This results in a temporary deadlock that dramatically slows down NTFD's
ability to process its main dispatch loop. The deadlock only lasts for approx.
1 second, when mbcsv_mds_send_msg() times out. But since there could be lots of
MBC messages to send, sometimes osafntfimcnd is killed with SIGABRT generating
a coredump. The si-swap operation will also timeout.
steps to reproduce
- Run loop of ntftest 32
root@SC-1:~# for i in {1..10}; do ntftest 32; done
- On another terminal, keep swapping 2N Opensaf SI, got coredump after couples
of swaps
root@SC-1:~# amf-adm si-swap safSi=SC-2N,safApp=OpenSAF
...
root@SC-1:~# amf-adm si-swap safSi=SC-2N,safApp=OpenSAF
~~~
SC-2 (active)
There are a lot of send failures. Each taking approx. 1 second to timeout.
During these 1 second timeouts, NTFD cannot process the main dispatch loop.
Dec 7 11:01:37.531772 osafntfd [452:mbcsv_mds.c:0185] >>
mbcsv_mds_send_msg: sending to vdest:e
Dec 7 11:01:37.531781 osafntfd [452:mbcsv_mds.c:0209] TR send type
MDS_SENDTYPE_REDRSP:
Dec 7 11:01:38.537307 osafntfd [452:mbcsv_mds.c:0247] <<
mbcsv_mds_send_msg: failure
Dec 7 11:01:38.537758 osafntfd [452:mbcsv_mds.c:0185] >>
mbcsv_mds_send_msg: sending to vdest:e
Dec 7 11:01:38.537766 osafntfd [452:mbcsv_mds.c:0209] TR send type
MDS_SENDTYPE_REDRSP:
Dec 7 11:01:39.543180 osafntfd [452:mbcsv_mds.c:0247] <<
mbcsv_mds_send_msg: failure
Dec 7 11:01:39.543695 osafntfd [452:mbcsv_mds.c:0185] >>
mbcsv_mds_send_msg: sending to vdest:e
Dec 7 11:01:39.543698 osafntfd [452:mbcsv_mds.c:0209] TR send type
MDS_SENDTYPE_REDRSP:
Dec 7 11:01:40.545252 osafntfd [452:mbcsv_mds.c:0247] <<
mbcsv_mds_send_msg: failure
Dec 7 11:01:40.545719 osafntfd [452:mbcsv_mds.c:0185] >>
mbcsv_mds_send_msg: sending to vdest:e
Dec 7 11:01:40.545726 osafntfd [452:mbcsv_mds.c:0209] TR send type
MDS_SENDTYPE_REDRSP:
Dec 7 11:01:41.551328 osafntfd [452:mbcsv_mds.c:0247] <<
mbcsv_mds_send_msg: failure
Dec 7 11:01:41.551971 osafntfd [452:mbcsv_mds.c:0185] >>
mbcsv_mds_send_msg: sending to vdest:e
Dec 7 11:01:41.551979 osafntfd [452:mbcsv_mds.c:0209] TR send type
MDS_SENDTYPE_REDRSP:
Dec 7 11:01:42.557594 osafntfd [452:mbcsv_mds.c:0247] <<
mbcsv_mds_send_msg: failure
Dec 7 11:01:42.558171 osafntfd [452:mbcsv_mds.c:0185] >>
mbcsv_mds_send_msg: sending to vdest:e
Dec 7 11:01:42.558179 osafntfd [452:mbcsv_mds.c:0209] TR send type
MDS_SENDTYPE_REDRSP:
Dec 7 11:01:43.564051 osafntfd [452:mbcsv_mds.c:0247] <<
mbcsv_mds_send_msg: failure
Dec 7 11:01:43.564874 osafntfd [452:mbcsv_mds.c:0185] >>
mbcsv_mds_send_msg: sending to vdest:e
Dec 7 11:01:43.564883 osafntfd [452:mbcsv_mds.c:0209] TR send type
MDS_SENDTYPE_REDRSP:
Dec 7 11:01:44.572407 osafntfd [452:mbcsv_mds.c:0247] <<
mbcsv_mds_send_msg: failure
Dec 7 11:01:44.573262 osafntfd [452:mbcsv_mds.c:0185] >>
mbcsv_mds_send_msg: sending to vdest:e
Dec 7 11:01:44.573271 osafntfd [452:mbcsv_mds.c:0209] TR send type
MDS_SENDTYPE_REDRSP:
Dec 7 11:01:45.575091 osafntfd [452:mbcsv_mds.c:0247] <<
mbcsv_mds_send_msg: failure
Dec 7 11:01:47.083548 osafntfd [452:mbcsv_mds.c:0185] >>
mbcsv_mds_send_msg: sending to vdest:e
~~~
~~~
SC-1 (standby)
NTFD is trying to terminate osafntfimcnd. While it is doing that, it cannot
reply to NTFD on SC-2. Meanwhile, osafntfimcnd is sending NTF notifications to
NTFD on SC-1.
Dec 7 11:01:35.453151 osafntfd [464:ntfs_imcnutil.c:0316] TR
handle_state_ntfimcn: Terminating osafntfimcnd process
Dec 7 11:01:45.474313 osafntfd [464:ntfs_imcnutil.c:0124] TR Termination
timeout
Dec 7 11:01:45.474375 osafntfd [464:ntfs_imcnutil.c:0130] <<
wait_imcnproc_termination: rc = -1, retry_cnt = 101
Dec 7 11:01:45.474387 osafntfd [464:ntfs_imcnutil.c:0168] TR Normal
termination failed. Escalate to abort
Dec 7 11:01:45.574703 osafntfd [464:ntfs_imcnutil.c:0172] TR Imcn
successfully aborted
Dec 7 11:01:45.574712 osafntfd [464:ntfs_imcnutil.c:0187] <<
timedwait_imcn_exit
~~~
---
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