linux-kernel - Re: [syzbot] [ocfs2?] possible deadlock in __ocfs2_flush_truncate

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Message-ID: <tcgpo4362fun5lfqbioewmnnoocpt7ryeezthhc4bfzagpw75n@t5cg6himsvmw>
Date: Fri, 4 Jul 2025 23:10:20 -0400
From: Ivan Pravdin <ipravdin.official@...il.com>
To: syzbot+6bf948e47f9bac7aacfa@...kaller.appspotmail.com
Cc: ipravdin.official@...il.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ocfs2?] possible deadlock in __ocfs2_flush_truncate_log

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

diff --git a/fs/ocfs2/move_extents.c b/fs/ocfs2/move_extents.c
index 369c7d27befd..ab460cb2c9c8 100644
--- a/fs/ocfs2/move_extents.c
+++ b/fs/ocfs2/move_extents.c
@@ -617,6 +617,8 @@ static int ocfs2_move_extent(struct ocfs2_move_extents_context *context,
         */
        credits += OCFS2_INODE_UPDATE_CREDITS + 1;

+       inode_lock(tl_inode);
+
        /*
         * ocfs2_move_extent() didn't reserve any clusters in lock_allocators()
         * logic, while we still need to lock the global_bitmap.
@@ -637,8 +639,6 @@ static int ocfs2_move_extent(struct ocfs2_move_extents_context *context,
                goto out_unlock_gb_mutex;
        }

-       inode_lock(tl_inode);
-
        handle = ocfs2_start_trans(osb, credits);
        if (IS_ERR(handle)) {
                ret = PTR_ERR(handle);

	Ivan Pravdin