When testing on another computer I got a BUG from the same general area:
[ 57.430698] BUG: sleeping function called from invalid context at
kernel/locking/rtmutex.c:917
[ 57.430699] in_atomic(): 1, irqs_disabled(): 0, pid: 3329, name: init
[ 57.430700] 2 locks held by init/3329:
[ 57.430709] #0: (&mm->mmap_sem){++++++}, at: [<ffffffff8103f17e>]
__do_page_fault+0x12e/0x5f0
[ 57.430715] #1: (ptlock_ptr(page)#2){+.+...}, at:
[<ffffffff8117235f>] do_read_fault.isra.66+0xaf/0x2d0
[ 57.430718] CPU: 1 PID: 3329 Comm: init Tainted: G E
3.18.24-realtime-1-rt22 #1
[ 57.430719] Hardware name: Komax AG, Dierikon Komax-PC/DH61DL, BIOS
BEH6110H.86A.0042.2012.0327.2202 03/27/2012
[ 57.430721] 0000000000000003 ffff8800d03c3888 ffffffff8174ad8a
0000000000000005
[ 57.430723] ffff8800d010a630 ffff8800d03c38a8 ffffffff810771a7
ffff8800d010a630
[ 57.430724] ffffffff81c5f220 ffff8800d03c38d8 ffffffff81751b44
ffff8800d03c38d8
[ 57.430725] Call Trace:
[ 57.430729] [<ffffffff8174ad8a>] dump_stack+0x4e/0x84
[ 57.430733] [<ffffffff810771a7>] __might_sleep+0xe7/0x120
[ 57.430735] [<ffffffff81751b44>] rt_spin_lock+0x24/0x60
[ 57.430737] [<ffffffff8109e44d>] ? trace_hardirqs_on_caller+0xfd/0x1c0
[ 57.430740] [<ffffffff81093349>] __wake_up+0x29/0x60
[ 57.430742] [<ffffffff810bcd04>] rcu_report_exp_rnp.isra.64+0xb4/0xc0
[ 57.430744] [<ffffffff810c0a9b>] rcu_read_unlock_special+0x1fb/0x250
[ 57.430747] [<ffffffff8174e4ba>] ? preempt_schedule_irq+0x4a/0x80
[ 57.430748] [<ffffffff810c0cd4>] rcu_note_context_switch+0x1e4/0x420
[ 57.430750] [<ffffffff8174d7c6>] __schedule+0x56/0x8a0
[ 57.430752] [<ffffffff8174e4ae>] ? preempt_schedule_irq+0x3e/0x80
[ 57.430754] [<ffffffff8174e4b4>] preempt_schedule_irq+0x44/0x80
[ 57.430757] [<ffffffff811ac815>] ? mem_cgroup_begin_page_stat+0x5/0x110
[ 57.430758] [<ffffffff81753883>] check_int_off+0x11/0x1e
[ 57.430760] [<ffffffff810c08a5>] ? rcu_read_unlock_special+0x5/0x250
[ 57.430762] [<ffffffff810bada5>] ? __rcu_read_unlock+0x95/0xa0
[ 57.430764] [<ffffffff81143848>] filemap_map_pages+0x188/0x270
[ 57.430765] [<ffffffff811436c5>] ? filemap_map_pages+0x5/0x270
[ 57.430768] [<ffffffff8117246a>] do_read_fault.isra.66+0x1ba/0x2d0
[ 57.430770] [<ffffffff81173abf>] handle_mm_fault+0x5ef/0xec0
[ 57.430772] [<ffffffff8103f17e>] ? __do_page_fault+0x12e/0x5f0
[ 57.430774] [<ffffffff8103f1e2>] __do_page_fault+0x192/0x5f0
[ 57.430777] [<ffffffff8139edeb>] ? trace_hardirqs_off_thunk+0x3a/0x3f
[ 57.430779] [<ffffffff8103f64c>] do_page_fault+0xc/0x10
[ 57.430781] [<ffffffff81754752>] page_fault+0x22/0x30
[ 57.430783] [<ffffffff813bd9dc>] ? strncpy_from_user+0x6c/0x120
[ 57.430786] [<ffffffff811c7a75>] getname_flags+0xb5/0x1a0
[ 57.430788] [<ffffffff811c7b72>] getname+0x12/0x20
[ 57.430790] [<ffffffff811b594d>] do_sys_open+0xfd/0x220
[ 57.430792] [<ffffffff8109e44d>] ? trace_hardirqs_on_caller+0xfd/0x1c0
[ 57.430793] [<ffffffff811b5a8e>] SyS_open+0x1e/0x20
[ 57.430795] [<ffffffff81752976>] system_call_fastpath+0x16/0x1b
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