2.6.33.1-rt11 BUG: sleeping function called from invalid context at kernel/rtmutex.c:684

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Hello,

I see a load of these after booting into 2.6.33.1-rt11:

BUG: sleeping function called from invalid context at kernel/rtmutex.c:684
pcnt: 1 0 in_atomic(): 1, irqs_disabled(): 0, pid: 1507, name: md1_raid5
Pid: 1507, comm: md1_raid5 Not tainted 2.6.33.1-rt11 #1
Call Trace:
 [<ffffffff8138fb8c>] ? rt_spin_lock+0x2c/0x70
 [<ffffffff812becc4>] ? __raid_run_ops+0x304/0xc60
 [<ffffffff812c0ccd>] ? handle_stripe+0x6bd/0x1a70
 [<ffffffff8104b460>] ? mod_timer+0x150/0x200
 [<ffffffff812c23f6>] ? raid5d+0x376/0x4f0
 [<ffffffff8138e5bd>] ? schedule_timeout+0x22d/0x2b0
 [<ffffffff8138fb8c>] ? rt_spin_lock+0x2c/0x70
 [<ffffffff812cd0f3>] ? md_thread+0x53/0x120
 [<ffffffff810573a0>] ? autoremove_wake_function+0x0/0x30
 [<ffffffff812cd0a0>] ? md_thread+0x0/0x120
 [<ffffffff81057016>] ? kthread+0x96/0xa0
 [<ffffffff81037908>] ? finish_task_switch+0x58/0xd0
 [<ffffffff810032d4>] ? kernel_thread_helper+0x4/0x10
 [<ffffffff81056f80>] ? kthread+0x0/0xa0
 [<ffffffff810032d0>] ? kernel_thread_helper+0x0/0x10

As these appear to be touching my raid array I am quite eager to learn
how I can fix the BUGs.

Please have a look and explain.

Kind regards,
Udo
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