I/O and machine hangs after loading SCSI Qlogic qioctlmod.ko ioctl device driver on RHEL4

Solution Verified - Updated -

Issue

  • I/O and/or machine hangs when userspace monitoring software uses a SCSI ioctl driver.
  • Sudden high load or IO wait, system unresponsive

Environment

  • Red Hat Enterprise Linux 4.8
  • Note that Red Hat Enterprise Linux 5 (and later) is specifically not affected.
  • Qlogic HBA

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