[Bug 1655584] Re: systemd-udevd busyloops when nvidia kernel module fails to load

[Lyubomir]

I might be experiencing this problem too. I use KVM/QEMU and load vfio-
pci driver in place of NVidia driver. nvidia-driver-455 here.

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Title:
  systemd-udevd busyloops when nvidia kernel module fails to load

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  On a machine where nvidia-367 is installed, but the driver won't attach (due to
  the nvidia card being older and requiring legacy drivers), systemd-udevd
  repeatedly attempts to load it anyway, causing high CPU and memory usage. I
  observed the systemd-udevd process at 98% CPU usage and 2.5G RSS reported by
  top(1); restarting the service reduces resource usage momentarily, but it
  appears to be climbing back up (I suspect the number of events is growing).

  Workaround is of course installing the correct driver package, but udevd really
  ought not behave like this if something fails to load.

  Some journal entries for systemd-udevd.service:

      Jan 11 11:22:11 systemd-udevd[11651]: Process '/sbin/modprobe nvidia-drm' failed with exit code 1.
      Jan 11 11:22:11 systemd-udevd[11651]: Process '/sbin/modprobe nvidia-uvm' failed with exit code 1.
      Jan 11 11:22:11 systemd-udevd[11651]: Process '/usr/bin/nvidia-smi' failed with exit code 9.
      Jan 11 11:22:11 systemd-udevd[11651]: Process '/sbin/modprobe nvidia-modeset' failed with exit code 1.
      Jan 11 11:22:11 systemd-udevd[11651]: Process '/sbin/modprobe nvidia-drm' failed with exit code 1.
      Jan 11 11:22:11 systemd-udevd[11651]: Process '/sbin/modprobe nvidia-uvm' failed with exit code 1.
      Jan 11 11:22:12 systemd-udevd[11651]: Process '/usr/bin/nvidia-smi' failed with exit code 9.
      Jan 11 11:22:12 systemd-udevd[11651]: Process '/sbin/modprobe nvidia-modeset' failed with exit code 1.
      Jan 11 11:22:12 systemd-udevd[11651]: Process '/sbin/modprobe nvidia-drm' failed with exit code 1.
      Jan 11 11:22:12 systemd-udevd[11651]: Process '/sbin/modprobe nvidia-uvm' failed with exit code 1.

  dmesg shows repeated failures for loading the nvidia module:

      [1675406.587926] NVRM: The NVIDIA GeForce 9300 GE GPU installed in this system is
  		     NVRM:  supported through the NVIDIA 340.xx Legacy drivers. Please
  		     NVRM:  visit http://www.nvidia.com/object/unix.html for more
  		     NVRM:  information.  The 367.57 NVIDIA driver will ignore
  		     NVRM:  this GPU.  Continuing probe...
      [1675406.587936] NVRM: No NVIDIA graphics adapter found!
      [1675406.588078] NVRM: NVIDIA init module failed!

  Release information:

      # lsb_release -rd
      Description:    Ubuntu 16.04.1 LTS
      Release:        16.04
      # apt policy systemd udev
      systemd:
        Installed: 229-4ubuntu13
        Candidate: 229-4ubuntu13
        Version table:
       *** 229-4ubuntu13 500
  	    500 http://ftp.funet.fi/pub/Linux/mirrors/ubuntu/archive xenial-updates/main amd64 Packages
  	    100 /var/lib/dpkg/status
  	 229-4ubuntu10 500
  	    500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
  	 229-4ubuntu4 500
  	    500 http://ftp.funet.fi/pub/Linux/mirrors/ubuntu/archive xenial/main amd64 Packages
      udev:
        Installed: 229-4ubuntu13
        Candidate: 229-4ubuntu13
        Version table:
       *** 229-4ubuntu13 500
  	    500 http://ftp.funet.fi/pub/Linux/mirrors/ubuntu/archive xenial-updates/main amd64 Packages
  	    100 /var/lib/dpkg/status
  	 229-4ubuntu10 500
  	    500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
  	 229-4ubuntu4 500
  	    500 http://ftp.funet.fi/pub/Linux/mirrors/ubuntu/archive xenial/main amd64 Packages

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