Symptom

During the normal course of operation, ssh to the device would be impacted and vpn users would face random disconnections with the below error message printed on the console: ERROR: FAIL to ALLOC the stack page 0xffffffffffffffff[size 36864] to 0x00007f2614692000 errno (mmap:umap) 12:0 First MMAP Req/Updated 36864/45056 Front 0x00007f2614691000 rtn 0x00007f2614692000 back 0x00007f261469b000 ERROR: FAIL to ALLOC the stack page 0xffffffffffffffff[size 36864] to 0x00007f2614692000 errno (mmap:umap) 12:0 : First MMAP Req/Updated 36864/45056 Front 0x00007f2614691000 rtn 0x00007f2614692000 back 0x00007f261469b000 : process_create: out of stack memory for name accept/ssh_4 size 32768 prio 3 : _listen_ssh: failed to create thread for interface 4 port 22 At the same time, sufficient free memory would be indicated by the show memory output.

Conditions

The below conditions need to be met: 1> Device running ASA ver 9.16.4.9 and above. 2> Multiple snmp pollers configured with a high poll frequency.

Workaround

Remove/reduce the number of snmp pollers and reboot the device. Post reboot, the stack memory would reset and we would not enter the error condition again due to the removal/reduction of snmp pollers.

Further Problem Description