@philcox we've had internal discussions on this and are no longer able
to reproduce this. we suspect it was an underlying hardware issue on the
cloud. i'm not sure what the right bug status to move this to since we
technically didn't have a fix released.

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https://bugs.launchpad.net/bugs/2076217

Title:
  booting an 24.10 or 24.04 ec2 instance with SEV-SNP enabled hangs
  sometimes

Status in cloud-images:
  New
Status in linux-aws package in Ubuntu:
  In Progress

Bug description:
  I'm trying to test an EC2 instance with SEV-SNP enabled. But the boot
  process hangs at:

  [snipped]
  [    0.609079] printk: legacy console [ttyS0] enabled
  [    5.405931] ACPI: Core revision 20230628
  [    5.430448] clocksource: hpet: mask: 0xffffffff max_cycles: 0xffffffff, 
max_idle_ns: 30580167144 ns
  [    5.473066] APIC: Switch to symmetric I/O mode setup

  
  Steps to reproduce are:

  $ AWS_DEFAULT_REGION=eu-west-1 aws ec2 run-instances --image-id
  ami-005a44922e2ffd1fa --instance-type m6a.large --cpu-options
  AmdSevSnp=enabled --key-name toabctl --tag-specifications
  'ResourceType=instance,Tags=[{Key=Name,Value=toabctl-2410-sevsnp-
  testing}]'

  The AMI ami-005a44922e2ffd1fa is ubuntu/images-testing/hvm-ssd-
  gp3/ubuntu-oracular-daily-amd64-server-20240716 and does contain
  6.8.0-1008-aws .

  Attached is the full output from the EC2 serial console.

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