oxidecomputer / oxidecomputer/propolis
Snapshot restore fails on Intel hosts when intr_shadow is set
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- Dominant language
- Rust
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Description
VM snapshot restore fails on Intel hosts with:
$ pfexec ./propolis-standalone --restore arch-1767964216637.tar
Jan 09 13:12:41.257 INFO restoring snapshot of VM from arch-1767964216637.tar
Jan 09 13:12:41.258 INFO Creating VM with 4 vCPUs, 3221225472 lowmem, 1073741824 highmem
Jan 09 13:12:42.571 INFO VM created, name: arch
Jan 09 13:12:42.593 INFO Bootorder declared as Some(["block0", "net0"])
Jan 09 13:12:42.593 INFO Generating E820 map for guest address space
Error: Failed to restore device state for bhyve-vcpu-0
Caused by:
0: IO Error
1: Invalid argument (os error 22)
1: Invalid argument (os error 22)
This occurs when the source vCPU was in an interrupt shadow state (intr_shadow: true) at snapshot time.
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- Read the whole issue, then the project's contributing guide.
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- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the reported propolis-standalone --restore failure on an Intel host and trace snapshot restoration for bhyve-vcpu-0. Focus on the case where the source vCPU has intr_shadow: true; done means restoring that snapshot succeeds without the invalid-argument error.
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Assessment
- Tech stack
- rust
- Domain
- operating-systems
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 42/100