Handle a race of collapse with a retrying fault.
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Authored by kib on Jan 23 2020, 11:24 AM.

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rS357091: Handle a race of collapse with a retrying fault.

Summary

Both vm_object_scan_all_shadowed() and vm_object_collapse_scan() might observe an invalid page left in the default backing object by the fault handler that retried. Check for the condition and refuse to collapse.

Reported by: pho

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rS FreeBSD src repository - subversion

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Buildable 28870

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kib created this revision.Jan 23 2020, 11:24 AM

Herald added a subscriber: imp. · View Herald TranscriptJan 23 2020, 11:24 AM

Harbormaster completed remote builds in B28870: Diff 67192.Jan 23 2020, 11:24 AM

kib added a subscriber: pho.Jan 23 2020, 11:24 AM

The goto is unfortunate but I see that without the loop becomes even weirder

This revision is now accepted and ready to land.Jan 24 2020, 1:52 AM

I completed a full stress2 test and ran the original problem test for 3 hours.
LGTM.

Closed by commit rS357091: Handle a race of collapse with a retrying fault. (authored by kib). · Explain WhyJan 24 2020, 7:42 PM

This revision was automatically updated to reflect the committed changes.

kib added a commit: rS357091: Handle a race of collapse with a retrying fault..

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vm_object.c

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Handle a race of collapse with a retrying fault.ClosedPublicActions