The patch titled Subject: mm/madvise: handle madvise_lock() failure during race unwinding has been added to the -mm mm-hotfixes-unstable branch. Its filename is mm-madvise-handle-madvise_lock-failure-during-race-unwinding.patch
This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...
This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------ From: SeongJae Park sj@kernel.org Subject: mm/madvise: handle madvise_lock() failure during race unwinding Date: Mon, 2 Jun 2025 10:49:26 -0700
When unwinding race on -ERESTARTNOINTR handling of process_madvise(), madvise_lock() failure is ignored. Check the failure and abort remaining works in the case.
Link: https://lkml.kernel.org/r/20250602174926.1074-1-sj@kernel.org Fixes: 4000e3d0a367 ("mm/madvise: remove redundant mmap_lock operations from process_madvise()") Signed-off-by: SeongJae Park sj@kernel.org Reported-by: Barry Song 21cnbao@gmail.com Closes: https://lore.kernel.org/CAGsJ_4xJXXO0G+4BizhohSZ4yDteziPw43_uF8nPXPWxUVChzw@... Reviewed-by: Jann Horn jannh@google.com Reviewed-by: Lorenzo Stoakes lorenzo.stoakes@oracle.com Acked-by: David Hildenbrand david@redhat.com Reviewed-by: Shakeel Butt shakeel.butt@linux.dev Reviewed-by: Barry Song baohua@kernel.org Cc: Liam Howlett liam.howlett@oracle.com Cc: Vlastimil Babka vbabka@suse.cz Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
mm/madvise.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
--- a/mm/madvise.c~mm-madvise-handle-madvise_lock-failure-during-race-unwinding +++ a/mm/madvise.c @@ -1881,7 +1881,9 @@ static ssize_t vector_madvise(struct mm_ /* Drop and reacquire lock to unwind race. */ madvise_finish_tlb(&madv_behavior); madvise_unlock(mm, behavior); - madvise_lock(mm, behavior); + ret = madvise_lock(mm, behavior); + if (ret) + goto out; madvise_init_tlb(&madv_behavior, mm); continue; } @@ -1892,6 +1894,7 @@ static ssize_t vector_madvise(struct mm_ madvise_finish_tlb(&madv_behavior); madvise_unlock(mm, behavior);
+out: ret = (total_len - iov_iter_count(iter)) ? : ret;
return ret; _
Patches currently in -mm which might be from sj@kernel.org are
mm-madvise-handle-madvise_lock-failure-during-race-unwinding.patch mm-damon-kconfig-set-damon_vaddrpaddrsysfs-default-to-damon.patch mm-damon-kconfig-enable-config_damon-by-default.patch