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    SubjectRe: [BUG] unable to handle kernel paging request in next-20080516
    On Sun, May 18, 2008 at 02:14:23AM -0700, Andrew Morton wrote:
    >
    > (cc's added)
    >
    > On Sat, 17 May 2008 12:50:24 +0000 (UTC) Sitsofe Wheeler <sitsofe@yahoo.com> wrote:
    >
    > > Sometimes when booting next-20080516 on Ubuntu Gutsy an oops then a panic
    > > will occur. At first I thought it might be provoked by vga=0x164 but this
    > > does not appear to be the case and the issue is seemingly random. I've
    > > hand transcribed the oops so there may be errors in it but hopefully it
    > > will still help:
    > >
    > > BUG: unable to handle kernel paging request at e6f17fac
    > > IP: [<c02604d6>] scsi_bus_uevent+0x1/0x17
    > > *pde = 2714b163 *pte = 26f17160
    > > Oops: 0000 [#1] DEBUG_PAGEALLOC
    > > last sysfs file:
    > >
    > > Pid: 1, comm: swapper Not tainted (2.6.26-rc2-next-20080516skw #30)
    > > EIP: 0060:[<c02604d6>] EFLAGS: 00010282 CPU: 0
    > > EIP is at scsi_bus_uevent+0x1/0x17
    > > EAX: e6f18014 EBX: e6f18014 ECX: c02604d5 EDX: e7173000
    > > ESI: e7173000 EDI: e7173000 EBP: e7851ca0 ESP: e7851c90
    > > DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
    > > Process swapper (pid: 1, ti=e7850000 task=e7848000 task.ti=e7850000)
    > > Stack: e7851ca0 c0237f3a c0237eac 00000000 e7851ce4 c01da36d 00000000 e6f180fc
    > > e7835000 c03ebf42 e7163240 c03af631 c040b050 c040b598 00000000 e6f18014
    > > 00000000 e7851cdc 00000000 e6f18014 00000000 e7851cec c01da52a e7851d2c
    > > Call Trace:
    > > [<c0237f3a>] ? dev_uevent+0x8e/0xca
    > > [<c0237eac>] ? dev_uevent+0x0/0xca
    > > [<c01da36d>] ? kobject_uevent_env+0x14c/0x2ff
    > > [<c01da52a>] ? kobject_uevent_env+0xa/0xc
    > > [<c023884b>] ? device_add+0x2bf/0x3f0
    > > [<c0321905>] ? mutex_unlock+0x8/0xa
    > > [<c02607b4>] ? scsi_sysfs_add_sdev+0x39/0x1d3
    > > [<c025f037>] ? scsi_probe_and_add_lun+0x714/0x08
    > > [<c025f9ef>] ? __scsi_add_device+0x85/0xab
    > > [<c026a70c>] ? ata_scsi_scan_host+0x7f/0x15e
    > > [<c0267ec8>] ? ata_host_register+0x1c8/0x1e5
    > > [<c026ec75>] ? ata_pci_sff_activate_host+0x179/0x19f
    > > [<c0270b61>] ? ata_sff_interupt+0x0/0x1d7
    > > [<c026f076>] ? ata_pci_sff_init_one+0x97/0xe1
    > > [<c027219c>] ? via_init_one+0x1da/0x1e3
    > > [<c01e5670>] ? pci_device_probe+0x39/0x59
    > > [<c023a0a1>] ? driver_probe_device+0x9f/0x119
    > > [<c023a158>] ? __driver_attach+0x3d/0x5f
    > > [<c023990a>] ? bus_for_each_dev+0x3e/0x60
    > > [<c0239f39>] ? driver_attach+0x14/0x16
    > > [<c023a11b>] ? __driver_attach+0x0/0x5f
    > > [<c0239c9d>] ? bus_add_driver+0x99/0x1a0
    > > [<c023a2d6>] ? driver_register+0x71/0xcd
    > > [<c01e5852>] ? __pci_register_driver+0x53/0x81
    > > [<c04205b1>] ? kernel_init+0x0/0xc4
    > > [<c04378fc>] ? via_init+0x14/0x16
    > > [<c0132800>] ? trace_softirqs_on+0x78/0x7e
    > > [<c01dd90c>] ? trace_hardirqs_on_thunk+0xc/0x10
    > > [<c0102c3a>] ? restore_nocheck_notrace+0x0/0xe
    > > [<c04205b1>] ? kernel_init+0x0/0x1c4
    > > [<c04205b1>] ? kernel_init+0x0/0x1c4
    > > [<c010373f>] ? kernel_thread_helper+0x7/0x10
    > > =======================
    > >
    >
    > I thought we'd already fixed this?

    I have a patch for it, posted to lkml on Friday (or was it thursday...)
    Then on Friday I went and audited all users of device_create and found 5
    other places where this same problem will occur (or something almost
    like it) and fixed them up and Cc:ed the subsystem maintainers that were
    affected.

    I wanted a round of tests in linux-next to happen before sending them
    all to Linus. I'll do that on Monday as they missed the last linux-next
    release.

    If you want to test them out yourself, the patches are this one first:
    http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/gregkh-01-driver-core.current/driver-core-add-device_create_vargs-and-device_create_drvdata.patch
    and then add any one of the rest of the patches in the directory at:
    http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/gregkh-01-driver-core.current/
    depending on the subsystem you are having problems with. There are 12
    different ones in there.

    hope this helps,

    greg k-h


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