Kernel panics due to a race condition between task_group() and sched_task_group()

Solution Verified - Updated -

Issue

  • system reboots with vmcore
  • panic happens in check_preempt_wakeup() or effective_load() routine

Environment

  • Red Hat Enterprise Linux (RHEL) 7.6 and 7.7
  • The issue is seen prominently after upgrading to kernel 3.10.0-1062.7.1.el7

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