Kernel panic - not syncing: hung_task: blocked tasks: khugepaged holds read lock on mmap_sem during whole huge page allocation

Solution In Progress - Updated -

Issue

  • A kernel panic occurred since the hung task detector thread (i.e. khungtaskd) noticed that a task was blocked too long and khugepaged is found to be the owner of the contended resource: mmap_sem

Environment

  • Red Hat Enterprise Linux 6.7
  • Red Hat Enterprise Linux 7.2

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