[asterisk-users] Anyone ever experienced a crash where Asterisk debug output a line with all nulls

[Dan Cropp]

We have a customer where their VM running Asterisk appears to have crashed.  Fortunately, we had some debugging enabled.
The asterisk messages file has this... (in notepad+ the blank line in the middle is all [NUL][NUL] [NUL][NUL]....)

[08/12 15:30:55.880] VERBOSE[6920] app_mixmonitor.c: Begin MixMonitor Recording CBRec/IS__a37ae004-c780-4c7f-88a9-a04402f0ab4e-0000e70f
[08/12 15:30:55.881] VERBOSE[6921] bridge_channel.c: Channel CBRec/IS__a37ae004-c780-4c7f-88a9-a04402f0ab4e-0000e70f joined 'softmix' base-bridge <23340bca-6823-4c70-a395-e3b092aeb671>
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          [08/12 15:33:02.887] Asterisk 16.2.1 built by root @ sw-genesis-build4 on a x86_64 running Linux on 2019-04-04 13:41:15 UTC


We also had debugging enabled and things were output to our debug file for 17 more seconds....
The blank line in my e-mail is once again a line with all [NUL}... (in notepad+ the blank line in the middle is all [NUL][NUL] [NUL][NUL]....)

[08/12 15:31:12.776] DEBUG[6781] audiohook.c: Read factory 0x7f079389bff8 and write factory 0x7f079389ca38 both fail to provide 160 samples
[08/12 15:31:12.777] DEBUG[6709] audiohook.c: Failed to get 160 samples from read factory 0x7f07937066d8
[08/12 15:31:12.777] DEBUG[6709] audiohook.c: Read factory 0x7f07937066d8 and write factory 0x7f0793707118 both fail to provide 160 samples
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         [08/12 15:33:02.915] Asterisk 16.2.1 built by root @ sw-genesis-build4 on a x86_64 running Linux on 2019-04-04 13:41:15 UTC
[Aug 12 15:33:02] DEBUG[1385] config.c: Parsing /etc/iss/asterisk/logger.conf



I believe this was bad enough that Ubuntu actually crashed, but there is nothing in the syslog indicating anything until 15:32:42 where it appears Linux is starting up.


After this situation happens, every time Asterisk starts up, it was taking significantly longer to load.  Normally 1-2 seconds, became 26-28 seconds.
[08/12 15:33:03.240] NOTICE[1385] loader.c: 286 modules will be loaded.
[08/12 15:33:23.844] VERBOSE[1385] loader.c: Loading extconfig.


Loading the modules is taking 20 seconds after this incident occurred.  Looking at the debug logs, I see the modules loading loader.c PASS.  There all seem to load fine, just much slower than it was previously.

Any suggestions on where to look for a cause of things running slow after this?

Dan
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