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    Subject[2.6.28.7] BUG: using smp_processor_id() in preemptible [00000000] code: pageattr-test/207
    Booting the most recent stable kernel 2.6.28.7 on my workhorse machine
    (Pentium D, openSUSE 10.3 32 bit userspace) produces rather a lot of
    the following BUG messages:

    <3>BUG: using smp_processor_id() in preemptible [00000000] code: pageattr-test/207
    <4>caller is paravirt_get_lazy_mode+0xe/0x1b
    <4>Pid: 207, comm: pageattr-test Not tainted 2.6.28.7-testing #1
    <4>Call Trace:
    <4> [<c0204760>] debug_smp_processor_id+0xac/0xc0
    <4> [<c011ad90>] paravirt_get_lazy_mode+0xe/0x1b
    <4> [<c011c925>] arch_flush_lazy_mmu_mode+0x8/0x19
    <4> [<c011d07c>] change_page_attr_set_clr+0x283/0x28e
    <4> [<c011d152>] change_page_attr_set+0xf/0x11
    <4> [<c011d347>] do_pageattr_test+0x1f3/0x3e3
    <4> [<c01247f1>] ? finish_task_switch+0xa0/0xa8
    <4> [<c032f799>] ? schedule+0x462/0x472
    <4> [<c0331353>] ? _spin_unlock_irqrestore+0x40/0x74
    <4> [<c011d154>] ? do_pageattr_test+0x0/0x3e3
    <4> [<c0139f1d>] kthread+0x3b/0x62
    <4> [<c0139ee2>] ? kthread+0x0/0x62
    <4> [<c0104a43>] kernel_thread_helper+0x7/0x10

    They occur regularly in bursts of ten, separated by 30 second break.
    The previous kernel:

    ts@xenon:~> uname -a
    Linux xenon 2.6.28.6-testing #1 SMP PREEMPT Wed Feb 18 21:05:30 CET 2009 i686 i686 i386 GNU/Linux

    with identical config and userspace (double-checked this time ;-)
    runs quite BUG-free.

    HTH
    Tilman

    --
    Tilman Schmidt E-Mail: tilman@imap.cc
    Bonn, Germany
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