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    Subjecthpwdt oops in clflush_cache_range
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    Date
    With an up-to-date git tree (head 7704a8b6) I'm seeing the oops below
    when the hpwdt driver gets loaded during boot on an HP DL380 system.
    I don't think I've seen any previous reports of this, and I guess it
    doesn't really count as a regression since the hpwdt driver was only
    added after 2.6.25-rc2.

    I haven't tried to debug this at all yet but any guidance about what
    information is useful for what looks to be an issue with c_p_a would
    be appreciated.

    - R.


    BUG: unable to handle kernel paging request at ffffc20001a08000
    IP: [<ffffffff8021dacc>] clflush_cache_range+0xc/0x25
    PGD 1bf80e067 PUD 1bf80f067 PMD 1bb1ab067 PTE 80000047000ee17b
    Oops: 0009 [1] SMP
    CPU 2
    Modules linked in: ide_pci_generic(+) ipmi_si ib_mthca container piix thermal ib_mad serio_raw ipmi_msghandler bnx2 evdev hpwdt(+) ib_core zlib_inflate ehci_hcd uhci_hcd button processor pcspkr psmouse ide_core
    Pid: 1291, comm: modprobe Not tainted 2.6.25-rc3 #51
    RIP: 0010:[<ffffffff8021dacc>] [<ffffffff8021dacc>] clflush_cache_range+0xc/0x25
    RSP: 0018:ffff8101bd421bc0 EFLAGS: 00010293
    RAX: ffff8101bb1ab040 RBX: 0000000000000000 RCX: 00000001bb1ab001
    RDX: ffffc20001a08fff RSI: 0000000000001000 RDI: ffffc20001a08000
    RBP: ffffc20001a08000 R08: ffff810000000000 R09: 00003ffffffff000
    R10: ffffc20001a08000 R11: 000000008807c350 R12: ffff8101bd421bf4
    R13: 0000000000000000 R14: 0000000000000001 R15: 800000000000017b
    FS: 00007f62818166e0(0000) GS:ffff8101bf802c00(0000) knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    CR2: ffffc20001a08000 CR3: 00000001bbdc6000 CR4: 00000000000006e0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Process modprobe (pid: 1291, threadinfo ffff8101bd420000, task ffff8101bbd34000)
    Stack: ffffffff8021e60b ffffc20001a09000 0000000000000018 0000000000000000
    0000000100000001 00000000047000ee 0000000100001000 0000000000001000
    ffffc20001a08000 00240047000ee000 ffff8101bbcd5f00 00240047000ee000
    Call Trace:
    [<ffffffff8021e60b>] ? change_page_attr_set_clr+0x140/0x18b
    [<ffffffff8021d94c>] ? __ioremap+0x197/0x1cd
    [<ffffffff8807a566>] ? :hpwdt:hpwdt_init_one+0x1c3/0x386
    [<ffffffff803351fe>] ? pci_device_probe+0xb3/0xfb
    [<ffffffff80393ffe>] ? driver_probe_device+0xb5/0x132
    [<ffffffff8039411d>] ? __driver_attach+0x0/0x93
    [<ffffffff80394177>] ? __driver_attach+0x5a/0x93
    [<ffffffff803933fa>] ? bus_for_each_dev+0x47/0x72
    [<ffffffff80393c1e>] ? bus_add_driver+0xb1/0x1fb
    [<ffffffff80394391>] ? driver_register+0x59/0xce
    [<ffffffff80335487>] ? __pci_register_driver+0x5a/0x8b
    [<ffffffff802526a1>] ? sys_init_module+0x18ff/0x1a08
    [<ffffffff8023ea31>] ? param_get_int+0x0/0x14
    [<ffffffff8024a6be>] ? trace_hardirqs_on+0xef/0x113
    [<ffffffff8041e1fa>] ? trace_hardirqs_on_thunk+0x35/0x3a
    [<ffffffff8020be5b>] ? system_call_after_swapgs+0x7b/0x80


    Code: 00 e8 de 09 02 00 31 d2 48 85 c0 74 0d 48 8b 40 08 b2 01 48 89 83 80 00 00 00 5b 89 d0 c3 90 89 f6 48 8d 54 37 ff 0f ae f0 eb 0d <0f> ae 3f 0f b7 05 4e ce 36 00 48 01 c7 48 39 d7 72 ee 0f ae 3a
    RIP [<ffffffff8021dacc>] clflush_cache_range+0xc/0x25
    RSP <ffff8101bd421bc0>
    CR2: ffffc20001a08000
    ---[ end trace 5e3e8191157a34b6 ]---


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