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    SubjectRe: Linux 2.6.23-rc5 - oops
    [Grant Wilson - Sat, Sep 01, 2007 at 10:11:10AM +0100]
    | On Fri, 31 Aug 2007 23:52:36 -0700 (PDT)
    | Linus Torvalds <torvalds@linux-foundation.org> wrote:
    |
    | >
    | > I'm making ready to leave for the kernel summit (as are probably a
    | > lot of other core kernel people), and as part of that, there's a
    | > 2.6.23-rc5 out there now.
    | >
    | > Hopefully we've addressed most regressions, so please do give it a
    | > good testing.
    | >
    | [snip]
    | > Tejun Heo (3):
    | > ata_piix: add Satellite U200 to broken suspend list
    | > libata: implement BROKEN_HPA horkage and apply it to affected
    | > drives ata_piix: implement IOCFG bit18 quirk
    |
    | Hi,
    | Get an oops when booting this kernel:
    |
    | [ 49.178892] Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP:
    | [ 49.178905] [<ffffffff803af352>] strlen+0x2/0x20
    | [ 49.180550] PGD 0
    | [ 49.181368] Oops: 0000 [1] PREEMPT SMP
    | [ 49.182189] CPU 0
    | [ 49.182994] Modules linked in:
    | [ 49.183805] Pid: 1, comm: swapper Not tainted 2.6.23-rc5 #2
    | [ 49.184619] RIP: 0010:[<ffffffff803af352>] [<ffffffff803af352>] strlen+0x2/0x20
    | [ 49.185445] RSP: 0000:ffff8100cff27be0 EFLAGS: 00010246
    | [ 49.186264] RAX: 0000000000000000 RBX: ffffffff809002c0 RCX: 0000000000000008
    | [ 49.187101] RDX: 000000000000830f RSI: 0000000000000000 RDI: 0000000000000000
    | [ 49.187947] RBP: ffff8100cff27c00 R08: 0000000000000009 R09: 0000000000000008
    | [ 49.188804] R10: 00000000000000fa R11: 0000000000000000 R12: ffffffff80833778
    | [ 49.189660] R13: 0000000000000000 R14: ffff8100cfe77070 R15: ffffffff8068cd20
    | [ 49.190508] FS: 0000000000000000(0000) GS:ffffffff80881000(0000) knlGS:0000000000000000
    | [ 49.191365] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
    | [ 49.192230] CR2: 0000000000000000 CR3: 0000000000201000 CR4: 00000000000006e0
    | [ 49.193103] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    | [ 49.193988] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    | [ 49.194878] Process swapper (pid: 1, threadinfo ffff8100cff26000, task ffff8100cff24000)
    | [ 49.195772] Stack: ffffffff803af644 0000000000000000 ffffffff80833778 0000000000000000
    | [ 49.196697] ffff8100cff27c30 ffffffff804f3d96 ffff8100cfe77000 ffffffff8068d1a8
    | [ 49.197620] ffff8100cfe77000 ffff8100cff27c70 ffff8100cff27d40 ffffffff80491f04
    | [ 49.197648] Call Trace:
    | [ 49.199465] [<ffffffff803af644>] strstr+0x24/0x80
    | [ 49.200382] [<ffffffff804f3d96>] dmi_check_system+0x46/0x90
    | [ 49.201300] [<ffffffff80491f04>] piix_init_one+0x184/0x630
    | [ 49.202214] [<ffffffff802d40d0>] sysfs_ilookup_test+0x0/0x20
    | [ 49.203126] [<ffffffff803c1a86>] pci_device_probe+0x76/0xa0
    | [ 49.204033] [<ffffffff8044e9a8>] driver_probe_device+0xa8/0x1b0
    | [ 49.204941] [<ffffffff8044ec85>] __driver_attach+0xe5/0xf0
    | [ 49.205847] [<ffffffff8044eba0>] __driver_attach+0x0/0xf0
    | [ 49.206750] [<ffffffff8044dbc3>] bus_for_each_dev+0x53/0x80
    | [ 49.207648] [<ffffffff8044e7dc>] driver_attach+0x1c/0x20
    | [ 49.208542] [<ffffffff8044dfd5>] bus_add_driver+0xa5/0x1e0
    | [ 49.209430] [<ffffffff8044eecd>] driver_register+0x4d/0x80
    | [ 49.210307] [<ffffffff803c1cb8>] __pci_register_driver+0x78/0xc0
    | [ 49.211184] [<ffffffff808ce089>] piix_init+0x19/0x30
    | [ 49.212048] [<ffffffff808b0774>] kernel_init+0x154/0x340
    | [ 49.212905] [<ffffffff80643714>] _spin_unlock_irq+0x14/0x40
    | [ 49.213769] [<ffffffff8020cb68>] child_rip+0xa/0x12
    | [ 49.214621] [<ffffffff808b0620>] kernel_init+0x0/0x340
    | [ 49.215472] [<ffffffff8020cb5e>] child_rip+0x0/0x12
    | [ 49.216318]
    | [ 49.217153]
    | [ 49.217153] Code: 80 3f 00 55 48 89 e5 74 11 48 89 f8 66 90 48 83 c0 01 80 38
    | [ 49.218908] RIP [<ffffffff803af352>] strlen+0x2/0x20
    | [ 49.219752] RSP <ffff8100cff27be0>
    | [ 49.220580] CR2: 0000000000000000
    | [ 49.221451] Kernel panic - not syncing: Attempted to kill init!
    |
    |
    | Using git-bisect the faulty commit is
    |
    | bad: [43a98f05d99205687ddf74089e79a8312c8c5f90] ata_piix: implement IOCFG bit18 quirk
    |
    | Cheers,
    | Grant
    |
    | -
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    | Please read the FAQ at http://www.tux.org/lkml/
    |

    Hi,

    test this, does it help?

    Cyrill
    ---

    diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
    index e40c94f..8031697 100644
    --- a/drivers/ata/ata_piix.c
    +++ b/drivers/ata/ata_piix.c
    @@ -1187,6 +1187,7 @@ static void piix_iocfg_bit18_quirk(struct pci_dev *pdev)
    DMI_MATCH(DMI_PRODUCT_NAME, "M570U"),
    },
    },
    + {}
    };
    u32 iocfg;

    -
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