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    SubjectRe: 2.6.24-rc5-mm1 -- inconsistent {in-hardirq-W} -> {hardirq-on-W} usage -- pm-hibernate/9940 [HC0[0]:SC0[0]:HE1:SE1]
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    On Wed, 2007-12-19 at 10:06 -0500, Miles Lane wrote:
    > [ 11.827653] PM: Creating hibernation image:
    > [ 11.827658] WARNING: at arch/x86/kernel/smp_32.c:561
    > native_smp_call_function_mask()
    > [ 11.827661] Pid: 9940, comm: pm-hibernate Not tainted
    > 2.6.24-rc5-mm1 #8
    > [ 11.827665] [<c0107d55>] show_trace_log_lvl+0x12/0x25
    > [ 11.827673] [<c010848a>] show_trace+0xd/0x10
    > [ 11.827677] [<c0108763>] dump_stack+0x57/0x5f
    > [ 11.827681] [<c0117db4>] native_smp_call_function_mask+0x41/0x126
    > [ 11.827686] [<c01192d9>] smp_call_function+0x18/0x1f
    > [ 11.827690] [<c012c624>] on_each_cpu+0x12/0x40
    > [ 11.827695] [<c0166ece>] drain_all_pages+0x13/0x16
    > [ 11.827700] [<c014f7b3>] swsusp_save+0x18/0x46b
    > [ 11.827705] [<c03103fa>] swsusp_arch_suspend+0x2a/0x2c
    > [ 11.827710] [<c014e7d8>] hibernate+0xba/0x16e
    > [ 11.827714] [<c014d56b>] state_store+0x45/0xac
    > [ 11.827717] [<c01ffe95>] kobj_attr_store+0x1a/0x22
    > [ 11.827722] [<c01b92c7>] sysfs_write_file+0xb8/0xe3
    > [ 11.827726] [<c01837eb>] vfs_write+0xa4/0x120
    > [ 11.827731] [<c0183d5e>] sys_write+0x3b/0x60
    > [ 11.827734] [<c0106bae>] sysenter_past_esp+0x6b/0xc1
    > [ 11.827738] =======================
    ...
    > [ 15.624993] =================================
    > [ 15.624995] [ INFO: inconsistent lock state ]
    > [ 15.624998] 2.6.24-rc5-mm1 #8
    > [ 15.624999] ---------------------------------
    > [ 15.625001] inconsistent {in-hardirq-W} -> {hardirq-on-W} usage.

    It looks like the swsusp_save() calls drain_all_pages() , which calls
    on_each_cpu() .. On return on_each_cpu() unconditionally enables
    interrupts so the rest of the resume process has interrupt enable
    (which , it looks like, shouldn't happen) and then you get the lockdep()
    warning due to the above..

    Not sure if this has been found already, or not?

    Should drain_all_pages() really be drain_local_pages() ?

    Daniel



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