ChenXiaoSong <chenxiaosong2@xxxxxxxxxx> writes:
> xfstests generic/013 and generic/476 reported WARNING as follows:
>
> WARNING: lock held when returning to user space!
> 6.1.0-rc5+ #4 Not tainted
> ------------------------------------------------
> fsstress/504233 is leaving the kernel with locks still held!
> 2 locks held by fsstress/504233:
> #0: ffff888054c38850 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at:
> lock_two_nondirectories+0xcf/0xf0
> #1: ffff8880b8fec750 (&sb->s_type->i_mutex_key#21/4){+.+.}-{3:3}, at:
> lock_two_nondirectories+0xb7/0xf0
>
> This will lead to deadlock and hungtask.
>
> Fix this by releasing locks when failed to write out on a file range in
> cifs_file_copychunk_range().
>
> Fixes: 3e3761f1ec7d ("smb3: use filemap_write_and_wait_range instead of filemap_write_and_wait")
> Signed-off-by: ChenXiaoSong <chenxiaosong2@xxxxxxxxxx>
> ---
> fs/cifs/cifsfs.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
Reviewed-by: Paulo Alcantara (SUSE) <pc@xxxxxx>
