What does [unsafe] in lsmod mean?

Solution Verified - Updated -

Issue

  • What does [unsafe] in lsmod mean?
  • The lsmod command lists a kernel module as unsafe like so:
# lsmod | grep -i sctp
sctp                  260873  2 [unsafe]
ipv6                  438241  208 sctp,rdma_cm,ib_addr,cnic
  • How to force remove an unsafe kernel module?

Environment

  • Red Hat Enterprise Linux 5

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