FAILED: patch "[PATCH] fuse: fix invalidate lock leak on open O_TRUNC DAX failure" failed to apply to 5.10-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x a927f1867e61b78f39f9da0bbba3c98c2ca151fe
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026083132-accuracy-outgrow-cea0@gregkh' --subject-prefix 'PATCH 5.10.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From a927f1867e61b78f39f9da0bbba3c98c2ca151fe Mon Sep 17 00:00:00 2001
From: Baokun Li <libaokun@linux.alibaba.com>
Date: Mon, 17 Aug 2026 23:18:01 +0800
Subject: [PATCH] fuse: fix invalidate lock leak on open O_TRUNC DAX failure
MIME-Version: 1.0
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fuse_open() takes filemap_invalidate_lock() for a DAX truncate
(dax_truncate = true) and releases it before the out_inode_unlock
label.  But when fuse_dax_break_layouts() fails, the goto
out_inode_unlock skips the unlock and leaks the rwsem, so any later
fault or truncate on the file stalls on the stale lock.

fuse_dax_break_layouts() can fail with -ERESTARTSYS when a signal
interrupts the wait for busy DAX pages to drain:

  open("file", O_RDWR | O_TRUNC)
  └─ fuse_open()
     ├─ filemap_invalidate_lock()        # dax_truncate
     └─ fuse_dax_break_layouts()
        └─ dax_break_layout()
           └─ wait_page_idle()           # TASK_INTERRUPTIBLE
              └─ fuse_wait_dax_page()    # unlock, schedule, re-lock
                 └─ signal → -ERESTARTSYS
     goto out_inode_unlock               # <- lock leaked

Fix this by moving filemap_invalidate_unlock() below the label so
that all error paths release the lock, and rename the label to
out_unlock as it now covers more than just the inode lock.

Fixes: 2fdbb8dd0155 ("fuse: fix deadlock between atomic O_TRUNC and page invalidation")
Cc: stable@vger.kernel.org # v6.0+
Signed-off-by: Baokun Li <libaokun@linux.alibaba.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 7b883cf170ac..3f67348d0f7e 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -272,7 +272,7 @@ static int fuse_open(struct inode *inode, struct file *file)
 		filemap_invalidate_lock(inode->i_mapping);
 		err = fuse_dax_break_layouts(inode, 0, -1);
 		if (err)
-			goto out_inode_unlock;
+			goto out_unlock;
 	}
 
 	if (is_wb_truncate || dax_truncate)
@@ -296,9 +296,9 @@ static int fuse_open(struct inode *inode, struct file *file)
 		else if (!(ff->open_flags & FOPEN_KEEP_CACHE))
 			invalidate_inode_pages2(inode->i_mapping);
 	}
+out_unlock:
 	if (dax_truncate)
 		filemap_invalidate_unlock(inode->i_mapping);
-out_inode_unlock:
 	if (is_wb_truncate || dax_truncate)
 		inode_unlock(inode);