Kernel panic due to Oracle Clusterware fencing triggered by oracssdagent disconnecting from CSS

Solution Verified - Updated -

Issue

  • Kernel panic triggered by the cssdagent task via the SysRq mechanism.
[ 5600.319321] SysRq : Trigger a crash
[ 5600.319346] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 5600.319413] CPU: 20 PID: 27188 Comm: cssdagent Kdump: loaded Tainted: POE  ------------  3.10.0-1160.129.1.el7.x86_64 #1
[ 5600.319413] Hardware name: Dell Inc. PowerEdge R730/072T6D, BIOS 2.19.0 12/12/2023
[ 5600.319414] task: ffff95a209151080 ti: ffff95c0bc484000 task.ti: ffff95c0bc484000
[ 5600.319415] RIP: 0010:[<ffffffff990910b6>] 
[ 5600.319417]  [<ffffffff990910b6>] sysrq_handle_crash+0x16/0x30

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Oracle Grid Infrastructure
  • Oracle RAC

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