Wireguard causes system to hang

[Erik Jerde]

HI Jason, thanks for the info, I’ve been troubleshooting this same problem on my WireGuard VM which has made it a bit trickier.  The info you posted cleared things up right quick for me.  Do you happen to know what microcode version fixes this issue?  I’m on 0x1000065 per /proc/cpuinfo but I can’t find any info on if that’s the “fixed” version or not.  I’m running latest FW for my motherboard which is dated 8/7/19 (ASRock Rack X470D4U).

Thanks!

> On Aug 25, 2019, at 10:50 AM, Jason A. Donenfeld <Jason at zx2c4.com> wrote:
> 
> WireGuard uses get_random_u32 which uses rdrand. AMD shipped with a
> broken rdrand. Update your CPU's microcode or your motherboard's BIOS
> and all should be good.
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