[  260.106087] Pid: 2485, comm: nautilus Tainted: P           O 2.6.43.2-6.fc15.x86_64 #35 BCM MX67QM/MX67QM
[  260.106130] RIP: 0010:[<ffffffff813065d0>]  [<ffffffff813065d0>] swiotlb_unmap_sg_attrs+0x30/0x70
[  260.106168] RSP: 0018:ffff8801e61a18f8  EFLAGS: 00010297
[  260.106190] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000002
[  260.106219] RDX: 0000000000000000 RSI: 0000000148b3d000 RDI: ffff88020ef400b0
[  260.106246] RBP: ffff8801e61a1928 R08: 0000000000000000 R09: ffffffff813065a0
[  260.106274] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000002
[  260.106302] R13: 0000000000000002 R14: ffff880211ee7090 R15: 0000000000000000
[  260.106331] FS:  00007f5e21ad9700(0000) GS:ffff88021dc80000(0000) knlGS:0000000000000000
[  260.106362] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[  260.106385] CR2: 0000000000000018 CR3: 000000020d7b8000 CR4: 00000000000406e0
[  260.106414] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  260.106442] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[  260.106474] Process nautilus (pid: 2485, threadinfo ffff8801e61a0000, task ffff88020e66dcc0)
[  260.106506] Stack:
[  260.106515]  ffff88020df4bb80 ffff88020ef40000 ffff8801e73e92b0 ffff88020df4bb80
[  260.106550]  ffffffffa032a1c9 ffffffffa032a1cf ffff8801e61a19f8 ffffffffa0327915
[  260.106586]  0000000000073d57 0000000000000020 0000000148b2e000 ffff8801e73e9420
[  260.106624] Call Trace:
[  260.106639]  [<ffffffffa0327915>] mydev_submit_req+0x415/0x5b0 [mydev]
[  260.106666]  [<ffffffff812ca8a9>] queue_unplugged+0x59/0xf0
[  260.106692]  [<ffffffff812cefec>] blk_flush_plug_list+0x1ac/0x200
[  260.106717]  [<ffffffff812cf058>] blk_finish_plug+0x18/0x50
[  260.106741]  [<ffffffff8112c909>] __do_page_cache_readahead+0x1d9/0x270
[  260.106769]  [<ffffffff8112ccd1>] ra_submit+0x21/0x30
[  260.106791]  [<ffffffff8112cdf5>] ondemand_readahead+0x115/0x230
[  260.106816]  [<ffffffff8112cf90>] page_cache_async_readahead+0x80/0xa0
[  260.106845]  [<ffffffff811adaec>] __generic_file_splice_read+0x39c/0x5d0
[  260.106873]  [<ffffffff81182130>] ? vfs_write+0x110/0x180
[  260.106895]  [<ffffffff811ac5c0>] ? write_pipe_buf+0x90/0xb0
[  260.106919]  [<ffffffff811ac139>] ? page_cache_pipe_buf_release+0x19/0x30
[  260.106946]  [<ffffffff811ac150>] ? page_cache_pipe_buf_release+0x30/0x30
[  260.106974]  [<ffffffff811add61>] generic_file_splice_read+0x41/0x90
[  260.107979]  [<ffffffff811ac50b>] do_splice_to+0x7b/0xa0
[  260.108959]  [<ffffffff811ae244>] sys_splice+0x164/0x580
[  260.109937]  [<ffffffff8161fee9>] system_call_fastpath+0x16/0x1b
[  260.110903] Code: 57 41 56 49 89 fe 41 55 41 89 cd 41 54 41 89 d4 53 48 83 ec 08 83 f9 03 74 46 31 db 85 d2 49 89 f7 7e 2e 0f 1f 84 00 00 00 00 00 <41> 8b 57 18 49 8b 77 10 44 89 e9 4c 89 f7 83 c3 01 e8 3a ff ff 
[  260.113024] RIP  [<ffffffff813065d0>] swiotlb_unmap_sg_attrs+0x30/0x70
[  260.114056]  RSP <ffff8801e61a18f8>
[  260.115061] CR2: 0000000000000018