Multiple subp taskprocessors for single extension

Asterisk Asterisk Support
1

Hey Everyone,

I’m hoping for some direction on an issue I’m having. I have a system with about 400 phones on it, and every once in a while a single phone will start running up a ton of subp processes.

The rest of the subp processes are fine, with 1 per extension. Once it hits about 3000, asterisk dumps, and it has to be restarted. The question is, how are these generated, and can someone give some clue as to how to stop it. This is currently running on 13.19.2 and have tested with 13.17.1 and 14.6.2. I have not tested latest 15 yet. Any direction would be awesome. (snippet below of the offending phone) This is chan_sip btw…

(from core show taskprocessors x 2000+ times)
subp:246@R10T105-0000107a 81 0 1 450 500
subp:246@R10T105-00001080 80 0 1 450 500
subp:246@R10T105-00001081 79 0 1 450 500
subp:246@R10T105-00001084 78 0 1 450 500
subp:246@R10T105-0000108a 77 0 1 450 500
subp:246@R10T105-0000108b 76 0 1 450 500
subp:246@R10T105-0000108d 75 0 1 450 500
subp:246@R10T105-00001091 74 0 1 450 500
subp:246@R10T105-00001093 73 0 1 450 500
subp:246@R10T105-00001095 72 0 1 450 500
subp:246@R10T105-00001099 71 0 1 450 500
subp:246@R10T105-0000109a 70 0 1 450 500
subp:246@R10T105-0000109b 69 0 1 450 500
subp:246@R10T105-0000109c 68 0 1 450 500
subp:246@R10T105-0000109d 67 0 1 450 500
subp:246@R10T105-0000109e 66 0 1 450 500
subp:246@R10T105-0000109f 65 0 1 450 500
subp:246@R10T105-000010a0 64 0 1 450 500
subp:246@R10T105-000010a1 63 0 1 450 500
subp:246@R10T105-000010a3 62 0 1 450 500
subp:246@R10T105-000010a4 61 0 1 450 500
subp:246@R10T105-000010a8 60 0 1 450 500

2

taskprocess
taskprocess.png897×505 19 KB

Interestingly enough, the MWI and Registrations are set to 120… I started a poll to see how often they are incrementing and every 5 minutes it shows +1…

So… re-registers are creating a new task processor for this one phone, I guess? I know I’m just talking to myself, but hey, maybe someone has an idea.

3

Making progress I think, I switched the offending phone to subscribemwi=no just as a test, and restarted asterisk… The task processors stayed level. Today I added a few new phones, and they started rising again, doing their normal little crashes it does before it finally dumps the core…

[2018-03-17 14:49:15] ERROR[13952]: astobj2.c:131 INTERNAL_OBJ: FRACK!, Failed assertion bad magic number 0x0 for object 0x7fd84c431fa0 (0)
Got 13 backtrace records
#0: [0x45bc37] asterisk(__ao2_ref+0x1a7) [0x45bc37]
#1: [0x7fd87cfa943a] /usr/lib/asterisk/modules/chan_sip.so(+0x6343a) [0x7fd87cfa943a]
#2: [0x5bc10b] asterisk() [0x5bc10b]
#3: [0x5d475e] asterisk(ast_taskprocessor_execute+0x15e) [0x5d475e]
#4: [0x5dc070] asterisk() [0x5dc070]
#5: [0x5d46be] asterisk(ast_taskprocessor_execute+0xbe) [0x5d46be]
#6: [0x5dc948] asterisk() [0x5dc948]
#7: [0x5e61ea] asterisk() [0x5e61ea]

tps
tps.png897×505 22.3 KB

It’s really bothering me, that a single phone can take down asterisk, but I feel like I’m getting closer. As you can see, after making the change a few days ago and restarted, the processors stayed normal until today when I added a few new phones to the mix, now they are climbing fast and throwing "FRACK!"s again…