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    SubjectRe: [-mmotm] BUG: scheduling while atomic: swapper
    On Mon, 25 Aug 2008 22:09:25 -0400 "Ryan Hope" <rmh3093@gmail.com> wrote:

    > BUG: scheduling while atomic: swapper/1/0x00000002
    > Modules linked in:
    > Pid: 1, comm: swapper Tainted: G W 2.6.27-rc4-zenmmotm1 #4
    > [<c057a0c7>] schedule+0x287/0x6d0
    > [<c03672e6>] vsnprintf+0x3a6/0x6c0
    > [<c057a92d>] schedule_timeout+0x7d/0xb0
    > [<c021e0c8>] __wake_up+0x38/0x50
    > [<c057a74a>] wait_for_common+0x8a/0x130
    > [<c0220ab0>] default_wake_function+0x0/0x10
    > [<c0237743>] call_usermodehelper_exec+0xc3/0xf0
    > [<c0362ede>] kobject_uevent_env+0x37e/0x3a0
    > [<c03d5921>] device_add+0x551/0x630
    > [<c03d5ac3>] device_create_vargs+0xb3/0xd0
    > [<c06ccc47>] microcode_intel_module_init+0x0/0x39
    > [<c03d5b0b>] device_create+0x2b/0x30
    > [<c0385f2e>] misc_register+0xbe/0x170
    > [<c02137d1>] microcode_init+0x21/0xf0
    > [<c0201336>] do_one_initcall+0x26/0x170
    > [<c021e0c8>] __wake_up+0x38/0x50
    > [<c0237c98>] insert_work+0x48/0x50
    > [<c02380a5>] __queue_work+0x25/0x40
    > [<c023812a>] queue_work_on+0x3a/0x50
    > [<c06c29bf>] kernel_init+0x170/0x251
    > [<c06c284f>] kernel_init+0x0/0x251
    > [<c0204157>] kernel_thread_helper+0x7/0x10
    > =======================

    As a mad guess, I'd guess that someone changed get_online_cpus() so
    that disables preemption (with a suitable config combination, perhaps).
    Which would cause microcode_init()'s sysdev_driver_register() to run
    in atomic context.

    But that's just a guess - I can't immediately see any change in there
    which does this. Ingo, any theories?



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