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In swp_pager_meta_build(), handle a race with other thread allocating

Description

In swp_pager_meta_build(), handle a race with other thread allocating
swapblk for our index while we dropped the object lock.

Noted by: jeff
Reviewed by: alc, markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week

Details

Provenance
kibAuthored on
Reviewer
alc
Parents
rS323223: MFC r322810 and r322830:
Branches
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Tags
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