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    Subject2.6.9rc2-mm4 oops
    I ran into this while testing the voluntary preemption S7 patch. It
    still happens in vanilla 2.6.9rc2-mm4 (with the small patch below that
    Ingo sent me, otherwise plain rc2-mm4 would not boot). The machine is an
    athlon64 based workstation and has no floppy drive:

    inserting floppy driver for
    Unable to handle kernel paging request at virtual address f8881920
    printing eip:
    *pde = 37f5f067
    Oops: 0002 [#1]
    Modules linked in: floppy(U) sg(U) dm_mod(U) uhci_hcd(U) ehci_hcd(U)
    button(U) battery(U) asus_acpi(U) ac(U) ext3(U) jbd(U) raid5(U) xor(U)
    sata_via(U) sata_promise(U) libata(U) sd_mod(U) scsi_mod(U)
    CPU: 0
    EIP: 0060:[<c0251d3d>] Not tainted VLI
    EFLAGS: 00010246 (
    EIP is at acpi_bus_register_driver+0xd2/0x165
    eax: f8881920 ebx: f88eefe0 ecx: c03d6b40 edx: f88ebd30
    esi: ffffffed edi: f6ed4000 ebp: c03d9460 esp: f6ed4f5c
    ds: 007b es: 007b ss: 0068
    Process modprobe (pid: 2119, threadinfo=f6ed4000 task=f6e71870)
    Stack: c03d94a0 f88e9126 00000015 00000014 f8870bc1 c03d94a0 f88ef280
    c0129ef7 c03d94a0 f88ef280 f6ed4000 c03d9460 c014dd52 00000246
    f6e1fc40 f6d8b8ac f6de4380 f6de43ac 00000000 b7fde008 0807a1a0
    Call Trace:
    [<f88e9126>] acpi_floppy_init+0x16/0x50 [floppy]
    [<f8870bc1>] floppy_init+0x11/0x600 [floppy]
    [<c0129ef7>] printk+0x17/0x20
    [<c014dd52>] sys_init_module+0x252/0x3b0
    [<c0106afd>] sysenter_past_esp+0x52/0x71
    Code: 00 00 00 a1 ec 67 3e c0 c7 05 78 67 3e c0 a0 7b 3a c0 c7 05 7c 67
    3e c0 bd 01 00 00 89 1d ec 67 3e c0 c7 03 e8 67 3e c0 89 43 04 <89> 18
    81 3d 68 67 3e c0 3c 4b 24 1d 74 1c 68 68 67 3e c0 68 bf
    <6>note: modprobe[2119] exited with preempt_count 1
    Debug: sleeping function called from invalid context at
    in_atomic():1, irqs_disabled():0
    [<c0125652>] __might_sleep+0xa2/0xb0
    [<c012d222>] do_exit+0xa2/0x980
    [<c010775f>] die+0x2bf/0x2c0
    [<c012a0b6>] vprintk+0x1b6/0x340
    [<c011e1e4>] do_page_fault+0x314/0x56c
    [<c01d8155>] sysfs_new_dirent+0x25/0x80
    [<c01d81cd>] sysfs_make_dirent+0x1d/0x90
    [<c0172a29>] unmap_area_pmd+0x49/0x60
    [<c01d7d84>] sysfs_add_file+0x74/0xa0
    [<c0172bb0>] unmap_vm_area+0x30/0x80
    [<c0173136>] __vunmap+0xb6/0xf0
    [<c0129cf0>] call_console_drivers+0x80/0x110
    [<c011ded0>] do_page_fault+0x0/0x56c
    [<c0106cf9>] error_code+0x2d/0x38
    [<c0251d3d>] acpi_bus_register_driver+0xd2/0x165
    [<f88e9126>] acpi_floppy_init+0x16/0x50 [floppy]
    [<f8870bc1>] floppy_init+0x11/0x600 [floppy]
    [<c0129ef7>] printk+0x17/0x20
    [<c014dd52>] sys_init_module+0x252/0x3b0
    [<c0106afd>] sysenter_past_esp+0x52/0x71
    ohci1394: $Rev: 1226 $ Ben Collins <>

    -- Fernando

    --- linux/init/main.c.orig
    +++ linux/init/main.c
    @@ -435,6 +435,12 @@ static void noinline rest_init(void)
    kernel_thread(init, NULL, CLONE_FS | CLONE_SIGHAND);
    + /*
    + * Re-enable preemption but disable interrupts to make sure
    + * we dont get preempted until we schedule() in cpu_idle().
    + */
    + local_irq_disable();
    + preempt_enable_no_resched();
    @@ -501,6 +507,7 @@ asmlinkage void __init start_kernel(void
    * time - but meanwhile we still have a functioning scheduler.
    + preempt_disable();
    --- linux/arch/i386/kernel/entry.S.orig
    +++ linux/arch/i386/kernel/entry.S
    @@ -197,10 +197,8 @@ need_resched:
    jz restore_all
    testl $IF_MASK,EFLAGS(%esp) # interrupts off (exception
    path) ?
    jz restore_all
    - movl $PREEMPT_ACTIVE,TI_preempt_count(%ebp)
    - call schedule
    - movl $0,TI_preempt_count(%ebp)
    + call preempt_schedule
    jmp need_resched
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