Knowledgebase
[KVM/XEN] HW_AES Detection Issues - (yum update - Illegal instruction)
Posted by Talal Ahmad on 26 September 2016 06:43 AM

The issue is due to Python attempting to execute a CPU opcode that is advertised as available by the server's host node virtualization system (XEN), but is not actually supported by the host node's hardware. With this in mind, please note and understand the issue being experienced is not a cPanel related error. The core of this issue is due to the host node's virtualization system (XEN) and the Network Security Services (nss*) packages.

A few examples of errors being reported as result of this issue:

Code:
root@server [/]# yum update
Loaded plugins: fastestmirror, security
Setting up Update Process
Loading mirror speeds from cached hostfile
Illegal instruction (core dumped)
Code:
Freeing read locks for locker 0x4670: 12281/139963921401600
Freeing read locks for locker 0x4672: 12281/139963921401600
Code:
Program received signal SIGILL, Illegal instruction.
0x00007fffed8c4d60 in ?? () from /usr/lib64/libfreeblpriv3.so
(gdb) quit

There have also been reports of Softaculous and RVSiteBuilder not functioning properly, resulting with a 500 error similar to the following:

Code:
No response from subprocess (php): The subprocess ended prematurely because it received the “ILL” (4) signal.

Similar to cPanel's Feature Request and Bug Reporting processes, you are highly recommended to provide feedback on the official upstream bug reports regarding this issue.

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