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    SubjectRe: realtime-preempt patch-2.6.18-rt7 oops
    > Karsten Wiese wrote:
    >> Does it make a difference, if you build & run with
    >> CONFIG_HIGH_RES_TIMERS disabled?
    >>
    >

    More food for thought; still with CONFIG_HIGH_RES_TIMERS not set:

    ...
    Oops: 0002 [#1]
    PREEMPT SMP
    Modules linked in: appletalk ax25 ipx p8023 ipv6 edd snd_seq_dummy
    snd_pcm_oss snd_mixer_oss snd_seq_midi snd_seq_midi_event w83627hf
    hwmon_vid snd_seq button hwmon i2c_isa battery ac loop dm_mod usbhid
    wacom intel_rng ehci_hcd shpchp pci_hotplug snd_ice1712
    snd_ice17xx_ak4xxx intel_agp snd_ak4xxx_adda snd_cs8427 snd_i2c
    snd_intel8x0 i2c_i801 snd_mpu401_uart agpgart i2c_core uhci_hcd ide_cd
    cdrom usbcore ohci1394 ieee1394 snd_cs46xx gameport snd_rawmidi
    snd_seq_device snd_ac97_codec snd_ac97_bus snd_pcm snd_timer snd
    soundcore snd_page_alloc i8xx_tco sk98lin ext3 jbd reiserfs fan thermal
    processor piix ide_disk ide_core
    CPU: 1
    EIP: 0060:[<c011e56b>] Not tainted VLI
    EFLAGS: 00210046 (2.6.18.1-rt7.1-smp #1)
    EIP is at enqueue_task+0x2b/0x90
    eax: c180f708 ebx: c180f28c ecx: 00000000 edx: c0357868
    esi: c0357840 edi: c180edc0 ebp: f7291cd0 esp: f7291cc8
    ds: 007b es: 007b ss: 0068 preempt: 00000004
    Process ssh-agent (pid: 3751, ti=f7290000 task=dfcb2630 task.ti=f7290000)
    Stack: c180edc0 c0357840 f7291ce0 c011e5f1 00000001 c0357840 f7291d44
    c0120971
    38c0f067 ff898284 c17181e0 00000000 0000001f f7290000 00000000
    00000001
    00000004 dfd010b0 c0357840 7e7ad015 00000009 b7ca1000 f7bc7ef0
    c03d4280
    Call Trace:
    [<c011e5f1>] __activate_task+0x21/0x40
    [<c0120971>] try_to_wake_up+0x321/0x450
    [<c0143b62>] wakeup_next_waiter+0xd2/0x1d0
    [<c0120b19>] wake_up_process_mutex+0x19/0x20
    [<c02ff861>] rt_spin_lock_slowunlock+0x41/0x70
    [<c02fe67c>] __schedule+0xc0c/0xee0
    [<c01439cb>] _atomic_dec_and_spin_lock+0x2b/0x40
    [<c01968ae>] dput+0x1e/0x140
    [<c02fefc5>] preempt_schedule_irq+0x55/0x80
    [<c010526c>] need_resched+0x20/0x24
    [<c010a41a>] convert_fxsr_to_user+0x10a/0x1a0
    [<c010a92d>] save_i387+0x12d/0x1e0
    [<c0104546>] setup_sigcontext+0x106/0x190
    [<c0104e49>] do_notify_resume+0x5e9/0x710
    [<c02fefc5>] preempt_schedule_irq+0x55/0x80
    [<c010526c>] need_resched+0x20/0x24
    [<c01923dd>] sys_select+0x4d/0x1b0
    [<c0104759>] restore_sigcontext+0x169/0x190
    [<c01053cc>] work_notifysig+0x13/0x1b
    Code: 55 89 e5 56 89 c6 53 89 d3 f6 40 0c 08 74 09 a1 60 b0 35 c0 85 c0
    75 4b 8b 46 1c 8d 56 28 8d 44 c3 1c 8b 48 04 89 46 28 89 50 04 <89> 11
    89 4a 04 8b 46 1c 83 43 04 01 0f ab 43 08 83 7e 1c 63 89
    EIP: [<c011e56b>] enqueue_task+0x2b/0x90 SS:ESP 0068:f7291cc8
    <6>note: ssh-agent[3751] exited with preempt_count 3

    ...
    Oops: 0002 [#1]
    __schedule+0x644/0xee0
    [<c011e5f1>] __activate_task+0x21/0x40
    [<c011e5f1>] __activate_task+0x21/0x40
    [<c01206ab>] try_to_wake_up+0x5b/0x450
    [<c01206ab>] try_to_wake_up+0x5b/0x450
    [<c0143c68>] __rt_mutex_adjust_prio+0x8/0x20
    [<c01444f1>] task_blocks_on_rt_mutex+0x111/0x210
    [<c01f42d2>] __next_cpu+0x12/0x30
    [<c02feac0>] schedule+0x30/0x100
    [<c02ff9cb>] rt_spin_lock_slowlock+0x9b/0x1b0
    [<c0302b6e>] kprobe_flush_task+0xe/0x50
    [<c02fe67c>] __schedule+0xc0c/0xee0
    [<c0105ceb>] reschedule_interrupt+0x1f/0x24
    [<c0103a70>] default_idle+0x0/0x80
    [<c0103ba1>] cpu_idle+0xb1/0x120
    BUG: scheduling from the idle thread!
    [<c02fe149>] __schedule+0x6d9/0xee0
    [<c011e5f1>] __activate_task+0x21/0x40
    [<c011e5f1>] __activate_task+0x21/0x40
    [<c01206ab>] try_to_wake_up+0x5b/0x450
    [<c0143c68>] __rt_mutex_adjust_prio+0x8/0x20
    [<c01444f1>] task_blocks_on_rt_mutex+0x111/0x210
    [<c01f42d2>] __next_cpu+0x12/0x30
    [<c02feac0>] schedule+0x30/0x100
    [<c02ff9cb>] rt_spin_lock_slowlock+0x9b/0x1b0
    [<c0302b6e>] kprobe_flush_task+0xe/0x50
    [<c02fe67c>] __schedule+0xc0c/0xee0
    [<c0105ceb>] reschedule_interrupt+0x1f/0x24
    [<c0103a70>] default_idle+0x0/0x80
    [<c0103ba1>] cpu_idle+0xb1/0x120
    PREEMPT SMP
    Modules linked in: appletalk ax25 ipx p8023 ipv6 edd snd_seq_dummy
    snd_pcm_oss snd_mixer_oss snd_seq_midi snd_seq_midi_event w83627hf
    snd_seq hwmon_vid hwmon i2c_isa button battery ac loop dm_mod intel_rng
    usbhid wacom shpchp snd_cs46xx i2c_i801 pci_hotplug gameport i2c_core
    intel_agp ide_cd cdrom ehci_hcd uhci_hcd agpgart snd_ice1712
    snd_ice17xx_ak4xxx snd_ak4xxx_adda ohci1394 i8xx_tco usbcore sk98lin
    snd_cs8427 ieee1394 snd_i2c snd_mpu401_uart snd_rawmidi snd_seq_device
    snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_pcm snd_timer snd soundcore
    snd_page_alloc ext3 jbd reiserfs fan thermal processor piix ide_disk
    ide_core
    CPU: 0
    EIP: 0060:[<c011e56b>] Not tainted VLI
    EFLAGS: 00010046 (2.6.18.1-rt7.1-smp #1)
    EIP is at enqueue_task+0x2b/0x90
    eax: c188f28c ebx: c188ee10 ecx: 00000000 edx: dfd010d8
    esi: dfd010b0 edi: c188edc0 ebp: c03e1e8c esp: c03e1e84
    ds: 007b es: 007b ss: 0068 preempt: 00000004
    Process swapper (pid: 0, ti=c03e0000 task=c0357840 task.ti=c03e0000)
    Stack: c188edc0 dfd010b0 c03e1e9c c011e5f1 00000001 dfd010b0 c03e1f00
    c0120971
    f7bc3930 c03e1eb8 00000001 00000000 0000001f c03e0000 00000001
    00000000
    00000004 dfd13670 c03e1f30 00000001 dfd005b0 c180edc0 dfd005b0
    c03d4280
    Call Trace:
    [<c011e5f1>] __activate_task+0x21/0x40
    [<c0120971>] try_to_wake_up+0x321/0x450
    [<c0143b62>] wakeup_next_waiter+0xd2/0x1d0
    [<c0120b19>] wake_up_process_mutex+0x19/0x20
    [<c02ff861>] rt_spin_lock_slowunlock+0x41/0x70
    [<c02fe67c>] __schedule+0xc0c/0xee0
    [<c0105ceb>] reschedule_interrupt+0x1f/0x24
    [<c0103a70>] default_idle+0x0/0x80
    [<c0103ba1>] cpu_idle+0xb1/0x120
    [<c03e5808>] start_kernel+0x368/0x440
    [<c03e5220>] unknown_bootoption+0x0/0x280
    Code: 55 89 e5 56 89 c6 53 89 d3 f6 40 0c 08 74 09 a1 60 b0 35 c0 85 c0
    75 4b 8b 46 1c 8d 56 28 8d 44 c3 1c 8b 48 04 89 46 28 89 50 04 <89> 11
    89 4a 04 8b 46 1c 83 43 04 01 0f ab 43 08 83 7e 1c 63 89
    EIP: [<c011e56b>] enqueue_task+0x2b/0x90 SS:ESP 0068:c03e1e84
    <0>Kernel panic - not syncing: Attempted to kill the idle task!
    [<c01271a1>] panic+0x51/0x120
    [<c012ae50>] do_exit+0x6e0/0xa90
    [<c0106462>] show_registers+0x172/0x240
    [<c012780b>] printk+0x1b/0x20
    [<c0110068>] positive_have_wrcomb+0x8/0x10
    [<c0106831>] die+0x301/0x310
    [<c0301cc5>] do_page_fault+0x205/0x610
    [<c0301ac0>] do_page_fault+0x0/0x610
    [<c0105e09>] error_code+0x39/0x40
    [<c011007b>] generic_validate_add_page+0xb/0x100
    [<c011e56b>] enqueue_task+0x2b/0x90
    [<c011e5f1>] __activate_task+0x21/0x40
    [<c0120971>] try_to_wake_up+0x321/0x450
    [<c0143b62>] wakeup_next_waiter+0xd2/0x1d0
    [<c0120b19>] wake_up_process_mutex+0x19/0x20
    [<c02ff861>] rt_spin_lock_slowunlock+0x41/0x70
    [<c02fe67c>] __schedule+0xc0c/0xee0
    [<c0105ceb>] reschedule_interrupt+0x1f/0x24
    [<c0103a70>] default_idle+0x0/0x80
    [<c0103ba1>] cpu_idle+0xb1/0x120
    [<c03e5808>] start_kernel+0x368/0x440
    [<c03e5220>] unknown_bootoption+0x0/0x280
    swapper/0[CPU#0]: BUG in smp_call_function at arch/i386/kernel/smp.c:557
    [<c01283f6>] __WARN_ON+0x66/0x90
    [<c0115220>] stop_this_cpu+0x0/0x40
    [<c011501a>] smp_call_function+0xda/0xe0
    [<c012780b>] printk+0x1b/0x20
    [<c011503b>] smp_send_stop+0x1b/0x30
    [<c01271b4>] panic+0x64/0x120
    [<c012ae50>] do_exit+0x6e0/0xa90
    [<c0106462>] show_registers+0x172/0x240
    [<c012780b>] printk+0x1b/0x20
    [<c0110068>] positive_have_wrcomb+0x8/0x10
    [<c0106831>] die+0x301/0x310
    [<c0301cc5>] do_page_fault+0x205/0x610
    [<c0301ac0>] do_page_fault+0x0/0x610
    [<c0105e09>] error_code+0x39/0x40
    [<c011007b>] generic_validate_add_page+0xb/0x100
    [<c011e56b>] enqueue_task+0x2b/0x90
    [<c011e5f1>] __activate_task+0x21/0x40
    [<c0120971>] try_to_wake_up+0x321/0x450
    [<c0143b62>] wakeup_next_waiter+0xd2/0x1d0
    [<c0120b19>] wake_up_process_mutex+0x19/0x20
    [<c02ff861>] rt_spin_lock_slowunlock+0x41/0x70
    [<c02fe67c>] __schedule+0xc0c/0xee0
    [<c0105ceb>] reschedule_interrupt+0x1f/0x24
    [<c0103a70>] default_idle+0x0/0x80
    [<c0103ba1>] cpu_idle+0xb1/0x120
    [<c03e5808>] start_kernel+0x368/0x440
    [<c03e5220>] unknown_bootoption+0x0/0x280
    ...


    I will now try turning on some .config debug options, e.g.
    CONFIG_PREEMPT, and if I can catch something I'll be back here with some
    more dumps ;)

    Cheers.
    --
    rncbc aka Rui Nuno Capela
    rncbc@rncbc.org
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