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

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Message-ID: <68689619.a00a0220.c7b3.002b.GAE@google.com>
Date: Fri, 04 Jul 2025 20:03:53 -0700
From: syzbot <syzbot+6bf948e47f9bac7aacfa@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [ocfs2?] possible deadlock in __ocfs2_flush_truncate_log

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Subject: Re: [syzbot] [ocfs2?] possible deadlock in __ocfs2_flush_truncate_log
Author: ipravdin.official@...il.com

#syz test

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