[asterisk-users] Asterisk runs at 100% CPU

[Patrick]

Dear asterisk users,

A few weeks ago I've been attacked by a DOS on REGISTER that I've
solved with a fail2ban script.
Now, since a few hours, I have my asterisk 1.4.21.2 running at 100% CPU again.

I've checked the log and it shows nothing related to failed register
or whatever. It just tells me that some of my peers are lagged, even
with a verbosity of 10000

I've made a "SIP SHOW CHANNELS" and I've a very strange thing, I got
between 4000 and 5000 active channels from peer 127.0.0.1. I have no
sip phone on localhost. Here is an excerpt of my command

Peer             User/ANR    Call ID      Seq (Tx/Rx)  Format
 Hold     Last Message
127.0.0.1        (None)      385677377    00101/00001  0x0 (nothing)
 No       Rx: REGISTER
127.0.0.1        (None)      1623666249   00101/00001  0x0 (nothing)
 No       Rx: REGISTER
127.0.0.1        (None)      1478349241   00101/00001  0x0 (nothing)
 No       Rx: REGISTER
127.0.0.1        (None)      1830524844   00101/00001  0x0 (nothing)
 No       Rx: REGISTER
127.0.0.1        (None)      1688182896   00101/00001  0x0 (nothing)
 No       Rx: REGISTER
127.0.0.1        (None)      1391124899   00101/00001  0x0 (nothing)
 No       Rx: REGISTER
127.0.0.1        (None)      2692644729   00101/00001  0x0 (nothing)
 No       Rx: REGISTER
127.0.0.1        (None)      2043438815   00101/00001  0x0 (nothing)
 No       Rx: REGISTER
127.0.0.1        (None)      3226298375   00101/00001  0x0 (nothing)
 No       Rx: REGISTER
127.0.0.1        (None)      170429466    00101/00001  0x0 (nothing)
 No       Rx: REGISTER

It is not a configuration issue causing loops because my config has
not changed since months.

Any help is appreciated

Best regards,
Patrick