Symptom

ASA/FTD failover pair may traceback and reload after upgrade with one of the following assertions: 1) Timer callback is NULL, last callback is 0x55d7682ca768~0x55d7682ca76f flags=0x0 ------ Dump timer ------ 0x00001504d1c588e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | ................ 0x00001504d1c588f0: c0 2b 65 a8 04 15 00 00 f8 88 c5 d1 04 15 00 00 | .+e............. 0x00001504d1c58900: f8 88 c5 d1 04 15 00 00 00 00 00 00 00 00 00 00 | ................ 0x00001504d1c58910: 00 00 00 00 00 00 00 00 ed 94 05 ed ba 0a 00 00 | ................ 0x00001504d1c58920: ef | . ------ End of timer Dump ------ core0: An internal error occurred. Specifically, a programming assertion was violated. Copy the error message exactly as it appears, and get the output of the show version command and the contents of the configuration file. Then call your technical support representative. assertion "0" failed: file "timer_services.c", line 166 2) ======= BLOCK DOUBLE FREE ======== core1: An internal error occurred. Specifically, a programming assertion was violated. Copy the error message exactly as it appears, and get the output of the show version command and the contents of the configuration file. Then call your technical support representative. assertion "0" failed: file "block.c", line 4777 3) core5: An internal error occurred. Specifically, a programming assertion was violated. Copy the error message exactly as it appears, and get the output of the show version command and the contents of the configuration file. Then call your technical support representative. assertion "point->ext_count == 0" failed: file "dsx.c", line 401 core1: An internal error occurred. Specifically, a programming assertion was violated. Copy the error message exactly as it appears, and get the output of the show version command and the contents of the configuration file. Then call your technical support representative. assertion "point->ext_count == 0" failed: file "dsx.c", line 401

Conditions

Failover/High Availability Pair ASA: 9.12(4)39 through 9.12(4)41 9.14(4) through 9.14(4)7 9.16(2)3 9.16(3) through 9.16(3)14 9.18(1) FTD: 6.4.0 patch 15 7.0.2 7.2.0

Workaround

Any of these options can be used as a workaround: 1) Downgrade 2) Disable Stateful failover (this is only possible on ASA) 3) Disable failover completely

Further Problem Description