On Wed, 8 Nov 2017 16:43:17 -0800 Patrick McLean chutzpah@gentoo.org wrote:
As of 4.13.11 (and also with 4.14-rc) we have an issue where when serving nfs4 sometimes we get the following BUG. When this bug happens, it usually also causes the motherboard to no longer POST until we externally re-flash the BIOS (using the BMC web interface). If a motherboard does not have an external way to flash the BIOS, this would brick the hardware.
If that is a production x86 system then you need to raise a large red flag with the vendor because it should not even be possible to splat the BIOS firmware on a modern PC by running even malicious OS code.
Not only that but if it has a flaw, and you bisect down to create a reproducer then it's not going to take the bad guys very long to turn it into an interesting toy to run if they ever exploit a box with that board.
Alan