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    SubjectRe: [BUG] NMI watchdog lockups caused by mwait_idle
    Pallipadi, Venkatesh wrote:
    > Darrick,
    >
    > I tried 2.6.20-rc4 on a Dempsey system here in my lab and it worked
    > fine. No watchdog lockups.
    > Can you try idle routine with hlt instead of mwait. There is no boot
    > option for this in x86_64, but you can change
    > arch/x86_64/kernel/process.c:select_idle_routine() not to enable mwait.
    > With that default kernel should use hlt based idle.
    >
    > Also, worth seeing will be, what happens when nmi_watchdog=0,
    > nmi_watchdog=1, and nmi_watchdog=2 boot options. That should tell us
    > whether nmi_watchdog is raising some false alarm or the CPUs are indeed
    > getting locked up here..
    >

    Locks up with hlt-based idle too. :(

    Here's what I get with nmi_watchdog=0:

    [ 206.088703] BUG: soft lockup detected on CPU#0!
    [ 206.093284]
    [ 206.093286] Call Trace:
    [ 206.097324] <IRQ> [<ffffffff801b1f89>] softlockup_tick+0xd4/0xe9
    [ 206.103618] [<ffffffff80173c55>] do_flush_tlb_all+0x0/0x68
    [ 206.109238] [<ffffffff8014d8f8>] run_local_timers+0x13/0x15
    [ 206.114949] [<ffffffff80192844>] update_process_times+0x4c/0x78
    [ 206.121008] [<ffffffff80174fcd>] smp_local_timer_interrupt+0x34/0x51
    [ 206.127498] [<ffffffff801756b1>] smp_apic_timer_interrupt+0x49/0x60
    [ 206.133901] [<ffffffff8015cd16>] apic_timer_interrupt+0x66/0x70
    [ 206.139956] <EOI> [<ffffffff80173baa>] __smp_call_function+0x66/0x87
    [ 206.146594] [<ffffffff80173ba6>] __smp_call_function+0x62/0x87
    [ 206.152564] [<ffffffff80173c55>] do_flush_tlb_all+0x0/0x68
    [ 206.158188] [<ffffffff80173c55>] do_flush_tlb_all+0x0/0x68
    [ 206.163813] [<ffffffff80173cef>] smp_call_function+0x32/0x49
    [ 206.169611] [<ffffffff80173c55>] do_flush_tlb_all+0x0/0x68
    [ 206.175236] [<ffffffff8018e117>] on_each_cpu+0x30/0x67
    [ 206.180514] [<ffffffff80173d46>] flush_tlb_all+0x1c/0x1e
    [ 206.185965] [<ffffffff80150f2a>] unmap_vm_area+0x1c3/0x265
    [ 206.191590] [<ffffffff80101c20>] init_level4_pgt+0xc20/0x1000
    [ 206.197474] [<ffffffff801bfc47>] remove_vm_area+0x41/0x67
    [ 206.203010] [<ffffffff8017c33c>] iounmap+0x8e/0xc8
    [ 206.207933] [<ffffffff80230032>] acpi_os_unmap_memory+0x9/0xb
    [ 206.213810] [<ffffffff8023aaff>] acpi_ev_system_memory_region_setup+0x52/0x105
    [ 206.221174] [<ffffffff80259465>] acpi_ut_delete_internal_obj+0x2c4/0x3b2
    [ 206.228012] [<ffffffff802596d3>] acpi_ut_update_ref_count+0x180/0x1d2
    [ 206.234587] [<ffffffff80259885>] acpi_ut_update_object_reference+0x160/0x207
    [ 206.241770] [<ffffffff802599e1>] acpi_ut_remove_reference+0xb5/0xd5
    [ 206.248173] [<ffffffff8024da8a>] acpi_ns_detach_object+0xca/0xee
    [ 206.254318] [<ffffffff8024b08a>] acpi_ns_delete_namespace_by_owner+0xcf/0x154
    [ 206.261597] [<ffffffff80234481>] acpi_ds_terminate_control_method+0xb5/0x14f
    [ 206.268779] [<ffffffff8024ef7c>] acpi_ps_parse_aml+0x242/0x3a0
    [ 206.274750] [<ffffffff80250a00>] acpi_ps_execute_pass+0xd5/0x10b
    [ 206.280895] [<ffffffff80250c3c>] acpi_ps_execute_method+0x1bf/0x2cb
    [ 206.287298] [<ffffffff8024b4da>] acpi_ns_evaluate+0x1f8/0x315
    [ 206.293180] [<ffffffff8024abf1>] acpi_evaluate_object+0x1d9/0x2fa
    [ 206.299411] [<ffffffff8010ab03>] kmem_cache_alloc+0xce/0xda
    [ 206.305125] [<ffffffff880146a9>] :processor:acpi_processor_start+0x656/0x6fd
    [ 206.312307] [<ffffffff801cc2a0>] kmem_cache_zalloc+0xce/0xf4
    [ 206.318103] [<ffffffff80261097>] acpi_start_single_object+0x2a/0x54
    [ 206.324509] [<ffffffff8026192d>] acpi_bus_register_driver+0xcd/0x14c
    [ 206.331001] [<ffffffff88022061>] :processor:acpi_processor_init+0x61/0xb7
    [ 206.337923] [<ffffffff801a4d6e>] sys_init_module+0xac/0x16c
    [ 206.343630] [<ffffffff8015c11e>] system_call+0x7e/0x83

    nmi_watchdog={1,2} produce the same errors.

    --D
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