CIFS: panic on concurrent mount operations due to null prepath and CIFS_MOUNT_USE_PREFIX_PATH set

Solution Verified - Updated -

Issue

  • System panics while mounting cifs share with below call traces:
[5997829.724909] CIFS VFS: cannot query dirs between root and final path, enabling CIFS_MOUNT_USE_PREFIX_PATH
[5997829.730550] BUG: unable to handle kernel NULL pointer dereference at           (null)
[5997829.731516] IP: [<ffffffffadf8b438>] strcmp+0x18/0x40
[5997829.731516] PGD 0 
[5997829.731516] Oops: 0000 [#1] SMP

Environment

  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 7
  • cifs client

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