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Subject2.6.21-rc6 + firstfloor patches: BUG: sleeping function called from invalid context at kernel/sched,.c:3643
I'm seeing this:

Apr 13 21:55:34 localhost kernel: BUG: sleeping function called from invalid context at kernel/sched.c:3643
Apr 13 21:55:34 localhost kernel: in_atomic():1, irqs_disabled():0
Apr 13 21:55:34 localhost kernel: 1 lock held by events/0/8:
Apr 13 21:55:34 localhost kernel: #0: (dbs_mutex){--..}, at: [<c032046b>] mutex_lock+0x1f/0x23
Apr 13 21:55:34 localhost kernel: [<c0106f25>] show_trace_log_lvl+0x1a/0x30
Apr 13 21:55:34 localhost kernel: [<c0107588>] show_trace+0x12/0x14
Apr 13 21:55:34 localhost kernel: [<c0107650>] dump_stack+0x16/0x18
Apr 13 21:55:34 localhost kernel: [<c011a56a>] __might_sleep+0xe5/0xeb
Apr 13 21:55:34 localhost kernel: [<c031f194>] wait_for_completion+0x1a/0xaa
Apr 13 21:55:34 localhost kernel: [<c011bea3>] set_cpus_allowed+0x6e/0x8c
Apr 13 21:55:34 localhost kernel: [<c010f490>] acpi_cpufreq_target+0x18d/0x262
Apr 13 21:55:34 localhost kernel: [<c02ae6d5>] __cpufreq_driver_target+0x27/0x32
Apr 13 21:55:34 localhost kernel: [<c02b0d2b>] do_dbs_timer+0x190/0x1d2
Apr 13 21:55:34 localhost kernel: [<c012ecde>] run_workqueue+0x8f/0x15f
Apr 13 21:55:34 localhost kernel: [<c012f4ab>] worker_thread+0xf8/0x124
Apr 13 21:55:34 localhost kernel: [<c0131cf0>] kthread+0xb5/0xe1
Apr 13 21:55:34 localhost kernel: [<c0106b07>] kernel_thread_helper+0x7/0x10
Apr 13 21:55:34 localhost kernel: =======================
Apr 13 21:55:34 localhost kernel: BUG: scheduling while atomic: events/0/0x00000002/8
Apr 13 21:55:34 localhost kernel: 1 lock held by events/0/8:
Apr 13 21:55:34 localhost kernel: #0: (dbs_mutex){--..}, at: [<c032046b>] mutex_lock+0x1f/0x23
Apr 13 21:55:34 localhost kernel: [<c0106f25>] show_trace_log_lvl+0x1a/0x30
Apr 13 21:55:34 localhost kernel: [<c0107588>] show_trace+0x12/0x14
Apr 13 21:55:34 localhost kernel: [<c0107650>] dump_stack+0x16/0x18
Apr 13 21:55:34 localhost kernel: [<c031e971>] __sched_text_start+0x79/0x86a
Apr 13 21:55:34 localhost kernel: [<c031f1ee>] wait_for_completion+0x74/0xaa
Apr 13 21:55:34 localhost kernel: [<c011bea3>] set_cpus_allowed+0x6e/0x8c
Apr 13 21:55:34 localhost kernel: [<c010f490>] acpi_cpufreq_target+0x18d/0x262
Apr 13 21:55:34 localhost kernel: [<c02ae6d5>] __cpufreq_driver_target+0x27/0x32
Apr 13 21:55:34 localhost kernel: [<c02b0d2b>] do_dbs_timer+0x190/0x1d2
Apr 13 21:55:34 localhost kernel: [<c012ecde>] run_workqueue+0x8f/0x15f
Apr 13 21:55:34 localhost kernel: [<c012f4ab>] worker_thread+0xf8/0x124
Apr 13 21:55:34 localhost kernel: [<c0131cf0>] kthread+0xb5/0xe1
Apr 13 21:55:34 localhost kernel: [<c0106b07>] kernel_thread_helper+0x7/0x10
[...repeat ad nauseum...]
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