server - Ubuntu 16.04 installer hangs on softlockup 812LC - Ask Ubuntu


posting on behalf of community member erik kooistra (erikk):

i installing ubuntu 16.04 using net install on multiple 812lc machines. every time installer hangs with.

[  125.900503] nmi watchdog: bug: soft lockup - cpu#4 stuck 23s! [swapper/4:0] 

and installer frozen time, after can continue installer.

also can connect installer using sol remote control not work.

is there fix this?

this looks race condition in ast framebuffer driver we've (now repeatedly) squashed on $time.

you should able add "ast.blacklist=yes" kernel command line blacklist ast framebuffer driver. disable vga port , you'll have use text installer (but you're doing that).

i thought newer kernels have had fix in them, perhaps particular ubuntu 1 has 1 of two/three fixes.


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