MRG-R kernel kernel-rt hangs immediately after boot with a trace showing aacraid driver

Solution Verified - Updated -

Issue

  • On my system MRG-R 1.3 (Red Hat Enterprise Linux (RHEL) 5 based) runs fine
  • On the same system RHEL6 kernels run without problems
  • Attempting to boot MRG-R 2.x (RHEL6 based) kernel-rt results in a kernel trace beeing displayed after boot, showing the 'aacraid' driver
  • The observed trace is similiar to this:

panic+0x89/0x143
oops_end+0xae/0xbe
no_context
__bad_area_nosemaphore
bad_area_nosemaphore
do_page_fault
page_fault
? rt_spin_lock_fastlock.clone.1
rt_spin_lock
add_wait_queue
acc_command_thread
? pick_next_task_fair
? acc_command_thread
? pick_next_task
? __schedule
? default_wake_function
? aac_command_thread
kthread
? finish_task_switch
kernel_thread_helper
? kthread
? kernel_thread_helper

Environment

  • Red Hat Enterprise Linux (RHEL) 5 and 6
  • MRG-R realtime kernel-rt packages
  • MRG-R 2.x kernel 2.6.33.9-rt31.71.el6rt not booting up
  • hardware 'Adaptec AAC-RAID (rev 09)'

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