Comment 5 for bug 1435509

The same problem persists with kernel 4.0.0-040000rc5-generic.

dmesg bits:

    [ 1.745316] HP CISS Driver (v 3.6.26)
    [ 1.746427] cciss 0000:06:01.0: PCI IRQ 41 -> rerouted to legacy IRQ 17
    [ 1.747134] cciss 0000:06:01.0: Controller reports max supported commands of 0, an obvious lie. Using 16. Ensure that firmware is up to date.
...
    [ 2.061355] cciss 0000:06:01.0: cciss0: <0x3220> at PCI 0000:06:01.0 IRQ 27 using DAC
...
    [ 240.416185] INFO: task modprobe:353 blocked for more than 120 seconds.
    [ 240.422489] Not tainted 4.0.0-040000rc5-generic #201503230035
    [ 240.429152] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
    [ 240.435587] modprobe D ffff880037283a18 0 353 135 0x00000004
    [ 240.441897] ffff880037283a18 0000000000000008 ffff8800cf958000 ffff88007d069e00
    [ 240.448564] ffff880036910a00 ffff880037283a78 ffff880037283fd8 7fffffffffffffff
    [ 240.454923] ffff880037283b88 ffff880036910a00 0000000000000000 ffff880037283a38
    [ 240.461449] Call Trace:
    [ 240.467119] [<ffffffff817e8567>] schedule+0x37/0x90
    [ 240.473177] [<ffffffff817eb215>] schedule_timeout+0x1b5/0x210
    [ 240.479751] [<ffffffff810a78a5>] ? try_to_wake_up+0x215/0x2a0
    [ 240.486058] [<ffffffff8104afbb>] ? native_smp_send_reschedule+0x4b/0x60
    [ 240.492338] [<ffffffff817e9918>] wait_for_completion+0xa8/0x170
    [ 240.498443] [<ffffffff810a7930>] ? try_to_wake_up+0x2a0/0x2a0
    [ 240.504617] [<ffffffff81093859>] flush_work+0x29/0x40
    [ 240.510452] [<ffffffff8108f860>] ? worker_detach_from_pool+0xd0/0xd0
    [ 240.516900] [<ffffffff810938d8>] work_on_cpu+0x68/0x70
    [ 240.522786] [<ffffffff8108f270>] ? workqueue_congested+0x80/0x80
    [ 240.528734] [<ffffffff81401940>] ? pci_device_shutdown+0x90/0x90
    [ 240.534632] [<ffffffff81402c42>] __pci_device_probe+0xe2/0xf0
    [ 240.540620] [<ffffffff81402c8a>] pci_device_probe+0x3a/0x60
    [ 240.546675] [<ffffffff8150dfd1>] really_probe+0x91/0x380
    [ 240.552392] [<ffffffff8150e447>] driver_probe_device+0x47/0xa0
    [ 240.557861] [<ffffffff8150e54b>] __driver_attach+0xab/0xb0
    [ 240.563487] [<ffffffff8150e4a0>] ? driver_probe_device+0xa0/0xa0
    [ 240.569119] [<ffffffff8150c32e>] bus_for_each_dev+0x5e/0x90
    [ 240.574618] [<ffffffff8150db7e>] driver_attach+0x1e/0x20
    [ 240.580199] [<ffffffff8150d704>] bus_add_driver+0x124/0x260
    [ 240.586065] [<ffffffff8150ee24>] driver_register+0x64/0xf0
    [ 240.591450] [<ffffffff81401d0c>] __pci_register_driver+0x4c/0x50
    [ 240.597030] [<ffffffffc011307d>] cciss_init+0x7d/0x1000 [cciss]
    [ 240.602153] [<ffffffffc0113000>] ? 0xffffffffc0113000
    [ 240.607056] [<ffffffff81002157>] do_one_initcall+0xd7/0x200
    [ 240.612103] [<ffffffff811c246d>] ? __vunmap+0xad/0xf0
    [ 240.616746] [<ffffffff811de13d>] ? kmem_cache_alloc_trace+0x19d/0x210
    [ 240.621400] [<ffffffff817d59c7>] do_init_module+0x61/0x1ce
    [ 240.626026] [<ffffffff8110059e>] load_module+0x49e/0x5f0
    [ 240.630361] [<ffffffff810fd600>] ? show_initstate+0x50/0x50
    [ 240.634677] [<ffffffff811007a4>] SyS_init_module+0xb4/0x100
    [ 240.639224] [<ffffffff817ec6cd>] system_call_fastpath+0x16/0x1b
    [ 240.643613] INFO: task kworker/0:3:354 blocked for more than 120 seconds.
    [ 240.648130] Not tainted 4.0.0-040000rc5-generic #201503230035
    [ 240.652444] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
    [ 240.657015] kworker/0:3 D ffff88003728bad8 0 354 2 0x00000000
    [ 240.661659] Workqueue: events work_for_cpu_fn
    [ 240.665719] ffff88003728bad8 0000000000000000 ffff880037ad4f00 ffffffff81c16500
    [ 240.670352] ffff880037646e00 ffff880037646e00 ffff88003728bfd8 7fffffffffffffff
    [ 240.675008] ffff88003728bc38 ffff880037646e00 0000000000000000 ffff88003728baf8
    [ 240.679776] Call Trace:
    [ 240.683516] [<ffffffff817e8567>] schedule+0x37/0x90
    [ 240.687842] [<ffffffff817eb215>] schedule_timeout+0x1b5/0x210
    [ 240.692127] [<ffffffff817e9918>] wait_for_completion+0xa8/0x170
    [ 240.696097] [<ffffffffc00f9c01>] ? start_io+0x71/0xf0 [cciss]
    [ 240.700029] [<ffffffff810a7930>] ? try_to_wake_up+0x2a0/0x2a0
    [ 240.704120] [<ffffffffc00fa95d>] sendcmd_withirq_core+0xad/0x1e0 [cciss]
    [ 240.708286] [<ffffffffc00fc6e0>] sendcmd_withirq+0xb0/0xc0 [cciss]
    [ 240.712731] [<ffffffffc0100c5c>] cciss_init_one+0x73c/0x880 [cciss]
    [ 240.716737] [<ffffffff8140198e>] local_pci_probe+0x4e/0xa0
    [ 240.720650] [<ffffffff8108f288>] work_for_cpu_fn+0x18/0x30
    [ 240.724852] [<ffffffff810920d4>] process_one_work+0x144/0x490
    [ 240.729011] [<ffffffff8109244c>] process_scheduled_works+0x2c/0x40
    [ 240.732962] [<ffffffff81092cc2>] worker_thread+0x2a2/0x450
    [ 240.736821] [<ffffffff81092a20>] ? create_worker+0x1f0/0x1f0
    [ 240.740706] [<ffffffff81098869>] kthread+0xc9/0xe0
    [ 240.744357] [<ffffffff810987a0>] ? flush_kthread_worker+0x90/0x90
    [ 240.748101] [<ffffffff817ec618>] ret_from_fork+0x58/0x90
    [ 240.752109] [<ffffffff810987a0>] ? flush_kthread_worker+0x90/0x90