I am using a Lenovo IdeaPad L340 with AMD  Ryzen 3 processor and Radeon 
VEGA graphics by AMD

Glad its not just me.

:)

On 2/19/20 1:26 AM, Andrei Belov wrote:
> Which hardware are you on?
>
> I'm seeing exactly the same behavior on Ubuntu 19.10 and KDE Neon on
> Lenovo Ideapad S340-14API with AMD Ryzen 3200U / Radeon Vega Mobile Gfx
> on board.
>
> The 5.3.0-28 kernel works just fine, while 5.3.0-40 shows the following 
> effect:
>   - on Ubuntu 19.10, booting never ends due to random "BUG: soft lockup - 
> CPU#xx stuck for 23s! [system-udevd:383]" events, thus causing various 
> jobs/services to hang forever;
>   - on KDE Neon, I'm seeing failures with amdgpu driver somewhere in 
> amdgpu_mm_rreg with a call trace ending with gfx_v9_0_set_safe_mode() call.
>
> Appreciate any input.
>

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https://bugs.launchpad.net/bugs/1863759

Title:
  CPUs stuck during boot after 19.10 upgrade to 5.3.0-40

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