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    SubjectRe: [PATCHSET] block: Convert block drivers to ->check_events(), take#2
    On 2011-03-09 10:20, Jens Axboe wrote:
    > On 2011-03-09 10:13, Tejun Heo wrote:
    >> Hello,
    >>
    >> This is the second take of convert-block-drivers-to-check_events
    >> patchset. Other than addition of Acked-by's and rebasing on top of
    >> the current block:for-2.6.39/core (df457f845e), nothing really
    >> changed.
    >
    > Thanks Tejun, applied.

    No worky:

    BUG: unable to handle kernel NULL pointer dereference at 0000000000000238
    IP: [<ffffffff81216741>] disk_unblock_events+0x1/0x20
    PGD 87573c067 PUD 877a29067 PMD 0
    Oops: 0000 [#1] PREEMPT SMP
    last sysfs file: /sys/devices/virtual/net/lo/operstate
    CPU 3
    Modules linked in: hid_apple usbhid uhci_hcd
    input: Mitsumi Electric Apple Extended USB Keyboard as /devices/pci0000:00/0000:00:1d.2/usb8/8-1/8-1.1/8-1.1.3/8-1.1.3:1.0/input/input6
    generic-usb 0003:05AC:020B.0005: input: USB HID v1.10 Keyboard [Mitsumi Electric Apple Extended USB Keyboard] on usb-0000:00:1d.2-1.1.3/input0
    input: Mitsumi Electric Apple Extended USB Keyboard as /devices/pci0000:00/0000:00:1d.2/usb8/8-1/8-1.1/8-1.1.3/8-1.1.3:1.1/input/input7
    generic-usb 0003:05AC:020B.0006: input: USB HID v1.10 Device [Mitsumi Electric Apple Extended USB Keyboard] on usb-0000:00:1d.2-1.1.3/input1
    ehci_hcd igb usbcore ahci libahci nls_base

    Pid: 4283, comm: swapon Not tainted 2.6.38-rc6+ #40 QCI QSSC-S4R/QSSC-S4R
    RIP: 0010:[<ffffffff81216741>] [<ffffffff81216741>] disk_unblock_events+0x1/0x20
    RSP: 0018:ffff880674183b78 EFLAGS: 00010202
    RAX: 0000000000000000 RBX: ffff8808774c5040 RCX: ffff880477b20800
    RDX: ffff8808774c5040 RSI: 000000000000001d RDI: 0000000000000000
    RBP: ffff880674183bd8 R08: 0000000000000000 R09: 0000000000000000
    R10: 0000000000000001 R11: 0000000000000010 R12: 0000000000000000
    R13: ffff8808774c5060 R14: 0000000000000000 R15: 000000000000001d
    FS: 00007f8e9f34b740(0000) GS:ffff88087fc00000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 0000000000000238 CR3: 0000000875761000 CR4: 00000000000006e0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Process swapon (pid: 4283, threadinfo ffff880674182000, task ffff880676632090)
    Stack:
    ffff880674183bd8 ffffffff8112a388 ffff8808774c5040 00000001812230c7
    ffff880674183bb8 0000000076536c48 ffff880674183bb8 ffff8808775aaa80
    ffff880276536c00 ffff8808775aaaa0 0000000000000004 000000000000001d
    Call Trace:
    [<ffffffff8112a388>] ? __blkdev_get+0x168/0x3b0
    [<ffffffff8112a444>] __blkdev_get+0x224/0x3b0
    [<ffffffff8112a8e0>] ? blkdev_open+0x0/0x80
    [<ffffffff8112a61f>] blkdev_get+0x4f/0x310
    [<ffffffff8112988a>] ? bdget+0x10a/0x120
    [<ffffffff8112a8e0>] ? blkdev_open+0x0/0x80
    [<ffffffff8112a940>] blkdev_open+0x60/0x80
    [<ffffffff810f6410>] __dentry_open+0x100/0x360
    [<ffffffff81101f9e>] ? generic_permission+0x1e/0xb0
    [<ffffffff810f6791>] nameidata_to_filp+0x71/0x80
    [<ffffffff81104318>] finish_open+0xc8/0x1a0
    [<ffffffff8110598d>] ? do_path_lookup+0x5d/0xe0
    [<ffffffff81106a7d>] do_filp_open+0x27d/0x7d0
    [<ffffffff81114e91>] ? mntput_no_expire+0x71/0x1a0
    [<ffffffff81112292>] ? alloc_fd+0xf2/0x140
    [<ffffffff810f6214>] do_sys_open+0x64/0x110
    [<ffffffff810f62eb>] sys_open+0x1b/0x20
    [<ffffffff81002d3b>] system_call_fastpath+0x16/0x1b
    Code: ff ff ff 48 8b 1b 48 8b 03 48 81 fb 80 8f 5e 81 0f 18 08 75 e5 48 c7 c7 60 8f 5e 81 e8 59 30 1f 00 31 c0 48 83 c4 08 5b c9 c3 55 <48> 83 bf 38 02 00 00 00 48 89 e5 74 07 31 f6 e8 2b fe ff ff c9

    --
    Jens Axboe



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