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@pkit pkit commented Dec 6, 2025

During prepare_save we must unconditionally trigger an interrupt to ensure the guest gets notified after restore. The guest may have suppressed notifications, but after snapshot/restore it needs to be woken up regardless.

Fixes #5554

Changes

Fixes a bug where guest would hang indefinitely on interrupts after resume.

Reason

See above.

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During prepare_save we must unconditionally trigger an interrupt
to ensure the guest gets notified after restore.
The guest may have suppressed notifications, but
after snapshot/restore it needs to be woken up regardless.

Fixes firecracker-microvm#5554

Signed-off-by: Constantine Peresypkin <pconstantine@gmail.com>
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pkit commented Dec 6, 2025

I will add some tests soon.

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[Bug] When using Async IO Engine pending ops cause resume to freeze

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