Patch "ceph: try to dump the msgs when decoding fails" has been added to the 6.4-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    ceph: try to dump the msgs when decoding fails

to the 6.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     ceph-try-to-dump-the-msgs-when-decoding-fails.patch
and it can be found in the queue-6.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 41d4ae930fd2b240e822205ba3ad06c9c7d4c6f3
Author: Xiubo Li <xiubli@xxxxxxxxxx>
Date:   Thu May 18 09:40:14 2023 +0800

    ceph: try to dump the msgs when decoding fails
    
    [ Upstream commit 8b0da5c549ae63ba1debd92a350f90773cb4bfe7 ]
    
    When the msgs are corrupted we need to dump them and then it will
    be easier to dig what has happened and where the issue is.
    
    Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx>
    Reviewed-by: Milind Changire <mchangir@xxxxxxxxxx>
    Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 83c4abff496da..5fb367b1d4b06 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -645,6 +645,7 @@ static int parse_reply_info(struct ceph_mds_session *s, struct ceph_msg *msg,
 	err = -EIO;
 out_bad:
 	pr_err("mds parse_reply err %d\n", err);
+	ceph_msg_dump(msg);
 	return err;
 }
 
@@ -3538,6 +3539,7 @@ static void handle_forward(struct ceph_mds_client *mdsc,
 
 bad:
 	pr_err("mdsc_handle_forward decode error err=%d\n", err);
+	ceph_msg_dump(msg);
 }
 
 static int __decode_session_metadata(void **p, void *end,
@@ -5258,6 +5260,7 @@ void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
 bad:
 	pr_err("error decoding fsmap %d. Shutting down mount.\n", err);
 	ceph_umount_begin(mdsc->fsc->sb);
+	ceph_msg_dump(msg);
 err_out:
 	mutex_lock(&mdsc->mutex);
 	mdsc->mdsmap_err = err;
@@ -5326,6 +5329,7 @@ void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
 bad:
 	pr_err("error decoding mdsmap %d. Shutting down mount.\n", err);
 	ceph_umount_begin(mdsc->fsc->sb);
+	ceph_msg_dump(msg);
 	return;
 }