freeswitch

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The process of Freeswitch is existed, but it doesn't process calls and command. There are 400 channels on Freeswitch. They all hang to death. When I wanted to excute fs_cli -x "show modules", it exported nothing. I set the log level debug. But 5 days ago, there was no log no longer. I tryed to use lsof command, then I find there were 4252 lines of [eventpoll]. I thank that it is the culprit.

$ ps -ef |grep freeswitch
root      40781  40744  6 Apr09 ?        3-05:38:30 /usr/local/freeswitch/bin/freeswitch -c -nonat

$ lsof -p $(pgrep -f freeswitch) |grep eventpoll |wc -l
4252

$ lsof -p $(pgrep -f freeswitch)
freeswitc  24 root 3356u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3357u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3358u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3359u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3360u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3361u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3362u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3363u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3364u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3365u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3366u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3367u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3368u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3369u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3370u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3371u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3372u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3373u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3374u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3375u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3376u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3377u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3378u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3379u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3380u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3381u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3382u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3383u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3384u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3385u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3386u  a_inode               0,13        0      11952 [timerfd]
freeswitc  24 root 3387u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3388u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3389u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3390u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3391u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3392u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3393u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3394u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3395u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3396u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3397u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3398u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3399u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3400u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3401u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3402u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3403u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3404u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3405u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3406u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3407u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3408u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3409u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3410u  a_inode               0,13        0      11952 [timerfd]
freeswitc  24 root 3411u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3412u  a_inode               0,13        0      11952 [timerfd]
freeswitc  24 root 3413u  a_inode               0,13        0      11952 [eventpoll]
freeswitc  24 root 3414u  a_inode               0,13        0      11952 [eventpoll]