panic in sk_busy_loop when net.core_busy_poll or net.core.busy_read are non-zero.

Solution Verified - Updated -

Issue

  • BUG: unable to handle kernel NULL pointer dereference at 00000000000000b0
  • IP: sk_busy_loop+0xbb/0x2e0
  • iwlwifi driver
  • any driver that does not set netdev_ops for NAPI

Environment

  • Red Hat Enterprise Linux 7 (RHEL7)
  • non-zero net.core.busy_ready
  • non-zero net.core.busy_poll

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