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Backport page unpoisoning fixes

Aristeu Rozanski requested to merge arozansk/centos-stream-9:arozansk-bz1972220 into main 
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1972220  
Tested: with reproducer  
  
This patchset fixes reference counting issues that still exist in RHEL9 and  
can be reproduced by soft poisoning/unpoisoning along with fixes to prevent  
silent corruption in tmpfs and shmem when a page is poisoned.

Signed-off-by: Aristeu Rozanski <arozansk@redhat.com>
Edited by Aristeu Rozanski

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