A)What platform are you running FreeSWITCH on? (eg: Debian 8 etc) b)How are you starting FreeSWITCH? (eg: in the foreground or background with an init script) From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Vladislav Ivanov Sent: Monday, December 14, 2015 9:47 AM To: freeswitch-users@lists.freeswitch.org Subject: [Freeswitch-users] Thread failure with low CPU utilization? Hello, I have 1.6.5 Freeswitch and I'm trying to test how much lines/cps it can handle on my test machine: CPU: Intel(R) Xeon(R) CPU E5450 @ 3.00GHz x2 (8 cores, 3 GHz) RAM: 32GB SSD: 500 GB I'm using call generator to check flood the freeswitch, but when FS gets 1k sessions it sends [CRIT] switch_core_session.c:1781 Thread Failure! and the Star Wars quote... But the CPU load is less than 10% Ulimit is as follows: core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 128330 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 32768 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 2048 cpu time (seconds, -t) unlimited max user processes (-u) 32768 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited Server is physical, not virtual, but I dont have the same issue with virtual freeswitch. Here is the "status" before the session limit: freeswitch@internal> status UP 0 years, 0 days, 0 hours, 0 minutes, 56 seconds, 137 milliseconds, 603 microseconds FreeSWITCH (Version 1.6.5 git 70b8c17 2015-11-20 20:57:50Z 64bit) is ready 994 session(s) since startup 994 session(s) - peak 994, last 5min 994 40 session(s) per Sec out of max 200, peak 41, last 5min 41 10000 session(s) max min idle cpu 10.00/96.77 Current Stack Size/Max 2048K/2048K freeswitch@internal> status UP 0 years, 0 days, 0 hours, 0 minutes, 56 seconds, 370 milliseconds, 877 microseconds FreeSWITCH (Version 1.6.5 git 70b8c17 2015-11-20 20:57:50Z 64bit) is ready 1003 session(s) since startup 1003 session(s) - peak 1003, last 5min 1003 40 session(s) per Sec out of max 200, peak 41, last 5min 41 993 session(s) max min idle cpu 10.00/96.77 Current Stack Size/Max 2048K/2048K freeswitch@internal> 2015-12-14 15:37:37.436968 [CRIT] switch_core_session.c:1781 Thread Failure! 2015-12-14 15:37:37.436968 [CRIT] switch_core_session.c:1737 LUKE: I'm hit, but not bad. 2015-12-14 15:37:37.436968 [CRIT] switch_core_session.c:1738 LUKE'S VOICE: Artoo, see what you can do with it. Hang on back there.... Green laserfire moves past the beeping little robot as his head turns. After a few beeps and a twist of his mechanical arm, Artoo reduces the max sessions to 993 thus, saving the switch from certain doom. Any help with that? Really strange error...