Re: [PATCH] mm/mmap_lock: Reset maple state on lock_vma_under_rcu() retry

On Tue, 11 Nov 2025 21:18:19 -0500 "Liam R. Howlett" Liam.Howlett@oracle.com wrote:

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Prior to commit 0b16f8bed19c ("mm: change vma_start_read() to drop RCU lock on failure"), vma_start_read() would drop rcu read lock and return NULL, so the retry would not have happened. However, now that vma_start_read() drops rcu read lock on failure followed by a retry, we may end up using a freed maple tree node cached in the maple state.

Yes, sounds good.

Andrew, can you make this change and also drop Cc stable tag?

Done.

This needs to be a hot fix, as Vlastimil said earlier.

Yup.