[merged mm-hotfixes-stable] mm-revert-mm-shmem-fix-data-race-in-shmem_getattr.patch removed from -mm tree

[merged mm-hotfixes-stable] mm-revert-mm-shmem-fix-data-race-in-shmem_getattr.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm: revert "mm: shmem: fix data-race in shmem_getattr()"
has been removed from the -mm tree.  Its filename was
     mm-revert-mm-shmem-fix-data-race-in-shmem_getattr.patch

This patch was dropped because it was merged into the mm-hotfixes-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Andrew Morton <akpm@linux-foundation.org>
Subject: mm: revert "mm: shmem: fix data-race in shmem_getattr()"
Date: Fri Nov 15 04:57:24 PM PST 2024

Revert d949d1d14fa2 ("mm: shmem: fix data-race in shmem_getattr()") as
suggested by Chuck [1].  It is causing deadlocks when accessing tmpfs over
NFS.

As Hugh commented, "added just to silence a syzbot sanitizer splat: added
where there has never been any practical problem".

Link: https://lkml.kernel.org/r/ZzdxKF39VEmXSSyN@tissot.1015granger.net [1]
Fixes: d949d1d14fa2 ("mm: shmem: fix data-race in shmem_getattr()")
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Jeongjun Park <aha310510@gmail.com>
Cc: Yu Zhao <yuzhao@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/shmem.c |    2 --
 1 file changed, 2 deletions(-)

--- a/mm/shmem.c~mm-revert-mm-shmem-fix-data-race-in-shmem_getattr
+++ a/mm/shmem.c
@@ -1166,9 +1166,7 @@ static int shmem_getattr(struct mnt_idma
 	stat->attributes_mask |= (STATX_ATTR_APPEND |
 			STATX_ATTR_IMMUTABLE |
 			STATX_ATTR_NODUMP);
-	inode_lock_shared(inode);
 	generic_fillattr(idmap, request_mask, inode, stat);
-	inode_unlock_shared(inode);
 
 	if (shmem_huge_global_enabled(inode, 0, 0, false, NULL, 0))
 		stat->blksize = HPAGE_PMD_SIZE;
_

Patches currently in -mm which might be from akpm@linux-foundation.org are

fs-proc-vmcorec-fix-warning-when-config_mmu=n.patch