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    SubjectRe: 2.6.17-mm4
    "Jesse Brandeburg" <jesse.brandeburg@gmail.com> wrote:
    >
    > >
    > > I guess it has to be dying in timekeeping_init(). Have you tried
    > > earlyprintk=vga or, better, earlyprintk=serial,ttyS0,9600?
    >
    > wish you would have said that earlier, i looked in
    > kernel-parameters.txt and didn't find earlyprinkt when searching for
    > debug :-(

    sorry.

    > two traces follow, one with the stock 2.6.17-mm4 kernel and the other
    > with the bisect kernel.
    >
    >
    > Linux version 2.6.17-mm4-jesse (root@lindenhurst-2.jf.intel.com) (gcc version 3.
    > 4.4 20050721 (Red Hat 3.4.4-2)) #1 SMP Thu Jun 29 08:53:59 PDT 2006
    > BIOS-provided physical RAM map:
    > BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
    > BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
    > BIOS-e820: 00000000000ebaf0 - 0000000000100000 (reserved)
    > BIOS-e820: 0000000000100000 - 000000005ffd0000 (usable)
    > BIOS-e820: 000000005ffd0000 - 000000005ffdf000 (ACPI data)
    > BIOS-e820: 000000005ffdf000 - 0000000060000000 (ACPI NVS)
    > BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
    > BIOS-e820: 00000000ffc00000 - 0000000100000000 (reserved)
    > kernel direct mapping tables up to 100000000 @ 8000-d000
    > DMI not present or invalid.
    > No NUMA configuration found
    > Faking a node at 0000000000000000-000000005ffd0000
    > Bootmem setup node 0 0000000000000000-000000005ffd0000
    > ACPI: PM-Timer IO Port: 0x408
    > ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
    > Processor #0 15:3 APIC version 20
    > ACPI: LAPIC (acpi_id[0x02] lapic_id[0x06] enabled)
    > Processor #6 15:3 APIC version 20
    > ACPI: LAPIC (acpi_id[0x03] lapic_id[0x01] enabled)
    > Processor #1 15:3 APIC version 20
    > ACPI: LAPIC (acpi_id[0x04] lapic_id[0x07] enabled)
    > Processor #7 15:3 APIC version 20
    > ACPI: IOAPIC (id[0x08] address[0xfec00000] gsi_base[0])
    > IOAPIC[0]: apic_id 8, version 32, address 0xfec00000, GSI 0-23
    > ACPI: IOAPIC (id[0x09] address[0xfec80000] gsi_base[24])
    > IOAPIC[1]: apic_id 9, version 32, address 0xfec80000, GSI 24-47
    > ACPI: IOAPIC (id[0x0a] address[0xfec80400] gsi_base[48])
    > IOAPIC[2]: apic_id 10, version 32, address 0xfec80400, GSI 48-71
    > ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
    > ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
    > Setting APIC routing to flat
    > ACPI: HPET id: 0x8086a202 base: 0xfed00000
    > Using ACPI (MADT) for SMP configuration information
    > Allocating PCI resources starting at 68000000 (gap: 60000000:80000000)
    > Built 1 zonelists. Total pages: 386918
    > Kernel command line: ro root=LABEL=/1 rhgb hdc=none video=atyfb:1024x768M-32@70
    > console=ttyS0,115200n8 console=tty1 panic=30 earlyprintk=serial,ttyS0,115200 ini
    > tcall_debug debug
    > ide_setup: hdc=none
    > Initializing CPU#0
    > PID hash table entries: 4096 (order: 12, 32768 bytes)
    > time.c: Using 14.318180 MHz WALL HPET GTOD HPET/TSC timer.
    > time.c: Detected 3600.267 MHz processor.
    > Unable to handle kernel NULL pointer dereference at 0000000000000034 RIP:
    > [<ffffffff8103396a>] do_timer+0x40/0x556
    > PGD 0
    > Oops: 0000 [1] SMP
    > last sysfs file:
    > CPU 0
    > Modules linked in:
    > Pid: 0, comm: swapper Not tainted 2.6.17-mm4-jesse #1
    > RIP: 0010:[<ffffffff8103396a>] [<ffffffff8103396a>] do_timer+0x40/0x556
    > RSP: 0018:ffffffff8130ce80 EFLAGS: 00010002
    > RAX: 0000000000000000 RBX: 000000000036ef8b RCX: 0000005135618814
    > RDX: 0000000000000000 RSI: 00000000001233fd RDI: ffffffff813adec8
    > RBP: 0000000000000000 R08: 00000000fffffffe R09: 0000000000000000
    > R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000019fb
    > R13: 0000000000000000 R14: ffffffff813adec8 R15: ffffffff813adec8
    > FS: 0000000000000000(0000) GS:ffffffff813a0000(0000) knlGS:0000000000000000
    > CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
    > CR2: 0000000000000034 CR3: 0000000001001000 CR4: 00000000000006a0
    > Process swapper (pid: 0, threadinfo ffffffff813ac000, task ffffffff8128be00)
    > Stack: 0000000000000000 0000000000000000 0000000000000001 0000000000000000
    > 0000000000000000 000000000036ef8b 0000000000000000 00000000000019fb
    > 0000000000000000 ffffffff813adec8 ffffffff813adec8 ffffffff8100d442
    > Call Trace:
    > <IRQ> [<ffffffff8100d442>] main_timer_handler+0x1ed/0x3ad
    > [<ffffffff8100d614>] timer_interrupt+0x12/0x27
    > [<ffffffff8105076a>] handle_IRQ_event+0x29/0x5a
    > [<ffffffff81050837>] __do_IRQ+0x9c/0xfd
    > [<ffffffff8100bf27>] do_IRQ+0x63/0x71
    > [<ffffffff810098b8>] ret_from_intr+0x0/0xa
    > <EOI>

    Right. This kernel presumably has the shiny new stack unwinding code
    enabled, so we didn't get half the backtrace (dammit). Are you able to
    recall whether the 2.6.17-mm4 build had CONFIG_UNWIND_INFO enabled?


    > Code: 8b 4a 34 48 d3 e0 48 01 42 58 48 8b 2d b5 3b 31 00 4c 8b 6d
    > RIP [<ffffffff8103396a>] do_timer+0x40/0x556
    > RSP <ffffffff8130ce80>
    > CR2: 0000000000000034
    > <0>Kernel panic - not syncing: Aiee, killing interrupt handler!
    >
    > and with the bisect kernel, slightly different
    > Bootdata ok (command line is ro root=LABEL=/1 rhgb hdc=none video=atyfb:1024x768
    > M-32@70 console=ttyS0,115200n8 console=tty1 panic=30 earlyprintk=serial,ttyS0,11
    > 5200 initcall_debug debug)
    > Linux version 2.6.17-bisect (root@lindenhurst-2.jf.intel.com) (gcc version 3.4.4
    > 20050721 (Red Hat 3.4.4-2)) #15 SMP Fri Jun 30 16:09:50 PDT 2006
    > BIOS-provided physical RAM map:
    > BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
    > BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
    > BIOS-e820: 00000000000ebaf0 - 0000000000100000 (reserved)
    > BIOS-e820: 0000000000100000 - 000000005ffd0000 (usable)
    > BIOS-e820: 000000005ffd0000 - 000000005ffdf000 (ACPI data)
    > BIOS-e820: 000000005ffdf000 - 0000000060000000 (ACPI NVS)
    > BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
    > BIOS-e820: 00000000ffc00000 - 0000000100000000 (reserved)
    > kernel direct mapping tables up to 100000000 @ 8000-8000
    > DMI not present or invalid.
    > ACPI: PM-Timer IO Port: 0x408
    > ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
    > Processor #0 15:3 APIC version 20
    > ACPI: LAPIC (acpi_id[0x02] lapic_id[0x06] enabled)
    > Processor #6 15:3 APIC version 20
    > ACPI: LAPIC (acpi_id[0x03] lapic_id[0x01] enabled)
    > Processor #1 15:3 APIC version 20
    > ACPI: LAPIC (acpi_id[0x04] lapic_id[0x07] enabled)
    > Processor #7 15:3 APIC version 20
    > ACPI: IOAPIC (id[0x08] address[0xfec00000] gsi_base[0])
    > IOAPIC[0]: apic_id 8, version 32, address 0xfec00000, GSI 0-23
    > ACPI: IOAPIC (id[0x09] address[0xfec80000] gsi_base[24])
    > IOAPIC[1]: apic_id 9, version 32, address 0xfec80000, GSI 24-47
    > ACPI: IOAPIC (id[0x0a] address[0xfec80400] gsi_base[48])
    > IOAPIC[2]: apic_id 10, version 32, address 0xfec80400, GSI 48-71
    > ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
    > ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
    > Setting APIC routing to flat
    > ACPI: HPET id: 0x8086a202 base: 0xfed00000
    > Using ACPI (MADT) for SMP configuration information
    > Allocating PCI resources starting at 68000000 (gap: 60000000:80000000)
    > Checking aperture...
    > Built 1 zonelists. Total pages: 385592
    > Kernel command line: ro root=LABEL=/1 rhgb hdc=none video=atyfb:1024x768M-32@70
    > console=ttyS0,115200n8 console=tty1 panic=30 earlyprintk=serial,ttyS0,115200 ini
    > tcall_debug debug
    > ide_setup: hdc=none
    > Initializing CPU#0
    > PID hash table entries: 4096 (order: 12, 32768 bytes)
    > time.c: Using 14.318180 MHz WALL HPET GTOD HPET/TSC timer.
    > time.c: Detected 3600.266 MHz processor.
    > Unable to handle kernel NULL pointer dereference at 0000000000000020 RIP:
    > <ffffffff80236e71>{do_timer+49}
    > PGD 0
    > Oops: 0000 [1] SMP
    > CPU 0
    > Modules linked in:
    > Pid: 0, comm: swapper Not tainted 2.6.17-bisect #15
    > RIP: 0010:[<ffffffff80236e71>] <ffffffff80236e71>{do_timer+49}
    > RSP: 0018:ffffffff80564e98 EFLAGS: 00010002
    > RAX: 0000000000000000 RBX: 000000000036ef8a RCX: 00000064e38a4032
    > RDX: 0000000000000000 RSI: 00000000001233fe RDI: ffffffff805f3e48
    > RBP: ffffffff80564eb8 R08: 0000000000000036 R09: 0000000000000000
    > R10: ffffffff805f3e70 R11: 0000000000000000 R12: 0000000000000000
    > R13: 00000000000019fa R14: 0000000000000001 R15: ffffffff805f3e48
    > FS: 0000000000000000(0000) GS:ffffffff805e5000(0000) knlGS:0000000000000000
    > CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
    > CR2: 0000000000000020 CR3: 0000000000201000 CR4: 00000000000006a0
    > Process swapper (pid: 0, threadinfo ffffffff805f2000, task ffffffff804adb00)
    > Stack: 000000000036ef8a 0000000000000000 00000000000019fa 0000000000000000
    > ffffffff80564ef8 ffffffff8020e1c3 0000000000000000 ffffffff804afb00
    > 0000000000000000 ffffffff805f3e48
    > Call Trace: <IRQ> <ffffffff8020e1c3>{main_timer_handler+547}
    > <ffffffff8020e445>{timer_interrupt+21} <ffffffff802569e3>{handle_IRQ_even
    > t+51}
    > <ffffffff80256ae2>{__do_IRQ+178} <ffffffff8020cd65>{do_IRQ+69}
    > <ffffffff8020a1aa>{ret_from_intr+0} <EOI> <ffffffff8043f7b3>{_spin_unlock
    > _irqrestore+19}
    > <ffffffff80256e8e>{setup_irq+222} <ffffffff805fc33e>{time_init+990}
    > <ffffffff805f577a>{start_kernel+250} <ffffffff805f5295>{_sinittext+661}
    >
    > Code: ff 50 20 4c 8b 2d 3d 2b 36 00 48 8b 15 3e 2b 36 00 49 89 c4
    > RIP <ffffffff80236e71>{do_timer+49} RSP <ffffffff80564e98>
    > CR2: 0000000000000020
    > <0>Kernel panic - not syncing: Aiee, killing interrupt handler!

    And this is the traditional backtrace which is actually useful.

    You've hit about seventeen bugs all at the same time here :(

    - There's something wrong in do_timer(). Everything's been inlined so
    it's hard to tell where it oopsed. If you're able to build with
    CONFIG_DEBUG_INFO and do

    gdb vmlinux
    (gdb) l *0xNNNNNNNNN

    where NNNNNNNN is the oopsing RIP address then it'll tell us the
    file-n-line.


    - Somebody enabled local interrupts. The early boot code is _supposed_ to
    hold interrupts off until start_kernel() does local_irq_eanble(). But we do
    heaps of things which make that unreliable.

    We don't know where this happened, and fixing that might make the oops go
    away.

    <thinks some more>

    I suspect that either local interrupts were enabled before you entered
    time_init(), or something under time_init() went and enabled interrupts, and
    the kernel will crash if it takes a timer interrupt before timekeeping_init()
    has run.

    As an experiment, try adding a local_irq_disable() in start_kernel(), just
    before it calls time_init().

    This stuff really really sucks.

    One guess would be that something under time_init()->setup_irq() is enabling
    interrupts. You could sprinkle

    if (!irqs_disabled() printk("%s:%d: BAD", __FILE__, __LINE__);

    throughout kernel/irq/manage.c:setup_irq().


    Boy we've made a mess in there.

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