The pause is happening in the code that inits the APIC.
Its after the APIC is set up when it is beginning to init the x2APIC.
It is timing related, and when I add a lot of print statements to the
code, the problem goes away. So, its been fun trying to narrow it down.
I have it narrowed down somewhat now. I tested with the oracular:linux
6.11 kernel, and it still has the pause. I tested the jammy:aws-6.5
kernel, and it seems to run fine.
Rather than debugging the 6.8 kernel, which is very time consuming, I
will do the following in parallel:
1) I will try to do a bisect between the 6.5 and 6.8 kernels to find the
regression point
2) I will examine the commits between 6.5 and 6.8 that touched the APIC code,
and see if any stand out to be the root cause.
One of these should get the answer.
** Changed in: linux-aws (Ubuntu)
Importance: Undecided => High
** Changed in: linux-aws (Ubuntu)
Status: New => In Progress
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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
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