Red Hat Enterprise Linux 6 server Kernel crashes with "divide by zero error in 'find_busiest_group'" error

Solution Verified - Updated -

Issue

  • A RHEL 6 system has a kernel panic on a divide by zero error in find_busiest_group, and it fails to boot.
  • A server hung unexpectedly with "divide by zero" error in find_busiest_group, and a reboot was required:
divide error
[...]
RIP  [<ffffffff81053b65>] find_busiest_group+0x5c5/0xb20
RSP <ffff880028363c40>
  • A crash core analysis of a vmcore following an unexpected reboot in RHEL 6 reveals the following exception RIP in its backtrace:
 [exception RIP: find_busiest_group+1477]

Environment

  • Red Hat Enterprise Linux 6.0
  • Red Hat Enterprise Linux 6.1
  • Red Hat Enterprise Linux 6.2

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