Public bug reported:
[Impact]
Firecracker process crashes with an "out of memory" error when it attempts to
run the vCPU for the first time, even if the system has enough available
memory:
```
2025-05-02T16:31:21.850912998 [daf77128-f177-4a01-9b97-a88dd9faa78f:fc_vcpu 0]
Failure during vcpu run: Out of memory (os error 12)
```
The issue is triggered by a race condition caused by the VMM thread sending a
SIGRTMIN to the vCPU thread, while it is starting
the nx_huge_page_recovery_thread. This makes the thread creation fail, but due
to a bug in the kernel, it is classified as a ENOMEM, instead of a
ERESTARTNOINTR, which should be retried.
[Fix]
Cherry-pick cb380909ae3b ("vhost: return task creation error instead of NULL")
and 916b7f42b3b3 ("kvm: retry nx_huge_page_recovery_thread creation").
[Test Case]
[Where problems could occur]
[Other info]
SF #00410184
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Noble)
Importance: Medium
Assignee: Magali Lemes do Sacramento (magalilemes)
Status: In Progress
** Also affects: linux (Ubuntu Noble)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Noble)
Status: New => In Progress
** Changed in: linux (Ubuntu Noble)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Noble)
Assignee: (unassigned) => Magali Lemes do Sacramento (magalilemes)
** Changed in: linux (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2109859
Title:
KVM bug causes Firecracker crash when it runs the vCPU for the first
time
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