asterisk users - Dec 2014 - Asterisk 1.8.32.1 -- Asterisk Hangs, FXOl DAHDI Channels Go Off-Hook, Operator FXS- Ringing

So far it happened two (2) times, last time yesterday. Opened case with Asterisk
https://issues.asterisk.org/jira/browse/ASTERISK-24593

All FXO channels went off-hook, Operator FXS was constantly ringing. If I picked
a handset there was a dead silence.  If I put it back on hook it would start
ringing.

FreePBX interface would not operate properly. Specifically it was slow to
authenticate, then some irrelevant messages were presented in the upper left
corner of the browser tab.

I tried to execute "core stop now" on the console and it would just
hang.

I was able to stop the Asterisk by connecting from another session and executing
"core stop now" the second time.

After the restart everything was back to normal.

Technical details.

/var/log/asterisk/full shows a number of messages like the following:
[2014-12-03 13:24:29] WARNING[31947] channel.c: Exceptionally long voice queue
length queuing to Local/414 at from-internal-00000165;1
[2014-12-03 13:24:30] WARNING[31947] channel.c: Exceptionally long voice queue
length queuing to Local/414 at from-internal-00000165;1
[2014-12-03 13:24:31] WARNING[31947] channel.c: Exceptionally long voice queue
length queuing to Local/414 at from-internal-00000165;1
[2014-12-03 13:24:33] WARNING[31947] channel.c: Exceptionally long voice queue
length queuing to Local/414 at from-internal-00000165;1

/var/log/messages shows a huge number of messages similar to the below at about
an hour and a half before Asterisk finally hang up:

Dec  3 12:30:14 pbx kernel: wctdm24xxp 0000:02:0c.0: Setting FXS hook state to 2
(04) framecount=333123791
Dec  3 12:30:14 pbx kernel: wctdm24xxp 0000:02:0c.0: SLIC_LF OK: card=3
shadow=64 lasttxhook=04 framecount=333123797
Dec  3 12:30:16 pbx kernel: wctdm24xxp 0000:02:0c.0: Setting FXS hook state to 1
(06) framecount=333125791
Dec  3 12:30:16 pbx kernel: wctdm24xxp 0000:02:0c.0: SLIC_LF OK: card=3
shadow=46 lasttxhook=06 framecount=333125797
Dec  3 12:30:20 pbx kernel: wctdm24xxp 0000:02:0c.0: Setting FXS hook state to 2
(04) framecount=333129791
Dec  3 12:30:20 pbx kernel: wctdm24xxp 0000:02:0c.0: SLIC_LF OK: card=3
shadow=64 lasttxhook=04 framecount=333129797
Dec  3 12:30:22 pbx kernel: wctdm24xxp 0000:02:0c.0: Setting FXS hook state to 1
(06) framecount=333131791
Dec  3 12:30:22 pbx kernel: wctdm24xxp 0000:02:0c.0: SLIC_LF OK: card=3
shadow=46 lasttxhook=06 framecount=333131797
Dec  3 12:30:26 pbx kernel: wctdm24xxp 0000:02:0c.0: Setting FXS hook state to 2
(04) framecount=333135791
Dec  3 12:30:26 pbx kernel: wctdm24xxp 0000:02:0c.0: SLIC_LF OK: card=3
shadow=64 lasttxhook=04 framecount=333135797
Dec  3 12:30:28 pbx kernel: wctdm24xxp 0000:02:0c.0: Setting FXS hook state to 1
(06) framecount=333137791
Dec  3 12:30:28 pbx kernel: wctdm24xxp 0000:02:0c.0: SLIC_LF OK: card=3
shadow=46 lasttxhook=06 framecount=333137797
Dec  3 12:30:32 pbx kernel: wctdm24xxp 0000:02:0c.0: Setting FXS hook state to 2
(04) framecount=333141791
Dec  3 12:30:32 pbx kernel: wctdm24xxp 0000:02:0c.0: SLIC_LF OK: card=3
shadow=64 lasttxhook=04 framecount=333141797
Dec  3 12:30:34 pbx kernel: wctdm24xxp 0000:02:0c.0: Setting FXS hook state to 1
(06) framecount=333143791
Dec  3 12:30:34 pbx kernel: wctdm24xxp 0000:02:0c.0: SLIC_LF OK: card=3
shadow=46 lasttxhook=06 framecount=333143797
Dec  3 12:30:38 pbx kernel: wctdm24xxp 0000:02:0c.0: Setting FXS hook state to 2
(04) framecount=333147791
Dec  3 12:30:38 pbx kernel: wctdm24xxp 0000:02:0c.0: SLIC_LF OK: card=3
shadow=64 lasttxhook=04 framecount=333147797
Dec  3 12:30:40 pbx kernel: wctdm24xxp 0000:02:0c.0: Setting FXS hook state to 1
(06) framecount=333149791
Dec  3 12:30:40 pbx kernel: wctdm24xxp 0000:02:0c.0: SLIC_LF OK: card=3
shadow=46 lasttxhook=06 framecount=333149797
Dec  3 12:30:44 pbx kernel: wctdm24xxp 0000:02:0c.0: Setting FXS hook state to 2
(04) framecount=333153791
Dec  3 12:30:44 pbx kernel: wctdm24xxp 0000:02:0c.0: SLIC_LF OK: card=3
shadow=64 lasttxhook=04 framecount=333153797

No core dump was produced.