CIFS client panics in cifsFileInfo_put due to a freed cifsFileInfo struct

Solution Unverified - Updated -

Issue

Frequent kernel panics on a CIFS client inside cifsFileInfo_put

Environment

  • Red Hat Enterprise Linux 7
    • seen on 3.10.0-693.21.1.el7, 3.10.0-862.9.1.el7, 3.10.0-957.5.1.el7
  • Red Hat Enterprise Linux 8
    • kernel versions including 4.18.0-147.el8 may be affected
  • cifs client
    • seen on CIFS 3.0 + Kerberos mount
  • multithreaded app. with frequent open/write/close a file

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