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uma_reclaim(). Reclamation code must not see half-constructed or destructed zones. Do this by bracing uma_zcreate() and uma_zdestroy() into a shared-locked sx, and take the sx exclusively in uma_reclaim(). Usually zones are not created/destroyed during the system operation, but tmpfs mounts do cause zone operations and exposed the bug. Another solution could be to only expose a new keg on uma_kegs list after the corresponding zone is fully constructed, and similar treatment for the destruction. But it probably requires more risky code rearrangement as well. Reported and tested by: pho Discussed with: avg Sponsored by: The FreeBSD Foundation MFC after: 2 weeks
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