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Fix a use-after-free in swp_pager_meta_free().
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Authored by markj on Nov 7 2018, 7:36 PM.
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I've been running buildworlds with this patch for several hours now without seeing segfaults; I'm pretty sure we can recommit r336984 after this fix. Note that the problem manifests much more easily with INVARIANTS kernels since UMA will trash freed memory.

This revision is now accepted and ready to land.Nov 7 2018, 10:43 PM
This revision was automatically updated to reflect the committed changes.