← 返回 禁止迁移含 HWPoison 页的 folio
v1 2026-09-28

禁止迁移含 HWPoison 页的 folio · v1

修复 memory_failure 放弃已置 PG_hwpoison 的 folio 后仍被迁移，导致损坏数据无 SIGBUS 复制给用户。

原始补丁链接

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子 Patch（2）

1/2
mm/compaction: skip folios containing hwpoisoned pages
memory_failure() sets PG_hwpoison on the error page before it manages to pin the folio via get_hwpoison_page(). Compaction running on another CPU can isolate that same folio in the meantime, so HWPoi
2/2
mm/migrate: refuse to migrate folios containing hwpoisoned pages
All callers of migrate_pages() without their own poison handling - move_pages(2), mbind(), NUMA balancing, alloc_contig_range() (CMA) and long-term GUP - can race memory_failure() the same way compact
v2 →