A panic occurred when executing umount command

Solution Verified - Updated -

Issue

A panic occurred when executing "umount" command.

  • Kernel parmeter "kernel.softlockup_panic = 1" is enabled.
  • The panic occurred after the softlockup occurred.
  • The softlockup occurred with a large amount of mounting.
  • The mount target is /var/named/chroot/var/named.

Environment

  • Red Hat Enterprise Linux 7
  • bind-9.9.4-51.el7.x86_64
  • bind-chroot-9.9.4-51.el7.x86_64

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