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Destroy the "qdiffsample_zone" UMA zone on unload to avoid a use-after-unload

Description

Destroy the "qdiffsample_zone" UMA zone on unload to avoid a use-after-unload
panic easily triggered by running "sysctl -a" after unload.

Reported and tested by: Grenville Armitage <garmitage@swin.edu.au>
MFC after: 1 week

Details

Provenance
lstewartAuthored on
Parents
rS270159: MFC r267921, r267934, r267949, r267959, r267966, r268202, r268276,
Branches
Unknown
Tags
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