IoctlFlags does not support UFFDIO_POISON #61
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vadimberezniker
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Apr 19, 2024
UFFD support is not compatible with newer kernels as there was a new ioctl option added that the older userfaultfd version does not recognize:
```
[PUT /snapshot/load][400] loadSnapshotBadRequest &{FaultMessage:Load snapshot error: Failed to restore from snapshot: Failed to load guest memory: Error creating guest memory from uffd: Failed to register memory address range with the userfaultfd object: Unrecognized ioctl flags: 284}
```
This was reported in bytecodealliance/userfaultfd-rs#61 and fixed in bytecodealliance/userfaultfd-rs#62
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vadimberezniker
added a commit
to vadimberezniker/firecracker
that referenced
this issue
Apr 19, 2024
UFFD support is not compatible with newer kernels as there was a new ioctl option added that the older userfaultfd version does not recognize:
```
[PUT /snapshot/load][400] loadSnapshotBadRequest &{FaultMessage:Load snapshot error: Failed to restore from snapshot: Failed to load guest memory: Error creating guest memory from uffd: Failed to register memory address range with the userfaultfd object: Unrecognized ioctl flags: 284}
```
This was reported in bytecodealliance/userfaultfd-rs#61 and fixed in bytecodealliance/userfaultfd-rs#62
Signed-off-by: Vadim Berezniker <[email protected]>
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From Linux 6.6,
uffdio_register.iotclscontains a bit for_UFFDIO_POISON(code).register() always fails as
UnrecognizedIoctls(284)becausestruct IoctlFlagsdoes not supportUFFDIO_POISONyet.The text was updated successfully, but these errors were encountered: