Thank you Miklos. I tested the patch, it works. On Thu, Jun 13, 2024 at 5:01 AM Miklos Szeredi <miklos@xxxxxxxxxx> wrote: > > On Thu, 13 Jun 2024 at 03:32, Youzhong Yang <youzhong@xxxxxxxxx> wrote: > > I analyzed the crash dump, here is what I figured out: > > - The overlay fs is mounted with only 2 lowerdirs, and nfs_export=on > > - When ovl_dentry_to_fid() is called on the root dentry: > > - ovl_check_encode_origin(dentry) returns 0 as euc_lower (I believe > > it should return 1 in this case) > > - "enc_lower ? ovl_dentry_lower(dentry) : ovl_dentry_upper(dentry)" > > evaluates to NULL > > - NULL is passed as the second argument to ovl_encode_real_fh(), so > > it crashes > > Thank you for the excellent report. > > The attached patch (untested) should fix it. > > Thanks, > Miklos
