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    SubjectRe: 2.6.20-git13 kernel BUG at /mnt/md0/devel/linux-git/kernel/time/tick-sched.c:168
    On 17/02/07, Alex Riesen <fork0@users.sourceforge.net> wrote:
    > Thomas Gleixner, Sat, Feb 17, 2007 16:14:17 +0100:
    > > On Sat, 2007-02-17 at 15:47 +0100, Alex Riesen wrote:
    > > > > > 164 if (need_resched())
    > > > > > 165 goto end;
    > > > > > 166
    > > > > > 167 cpu = smp_processor_id();
    > > > > > 168 BUG_ON(local_softirq_pending());
    > > > >
    > > > > Hmm, the BUG_ON is inside of an interrupt disabled region, so we should
    > > > > have bailed out early in the need_resched() check above (because we are
    > > > > in the idle task context according to the stack trace).
    > > > >
    > > > > Is this reproducible ?
    > > >
    > > > Seen this too (Ubuntu, P4/ht-SMT, SATA, typed from screen):
    > >
    > > Can you please apply the patch below, so we can at least see, which
    > > softirq is pending. This should trigger independently of hrtimers and
    > > dynticks. You can keep it compiled in and disable it at the kernel
    > > commandline with "nohz=off" and / or "highres=off"
    >
    > It did, only one time:
    >
    > Idle: local softirq pending: 0020<6>USB Universal Host Controller Interface driver v3.0
    >

    sudo cat /var/log/messages | grep Idle
    Feb 17 17:35:34 bitis-gabonica kernel: Idle: local softirq pending:
    0020<6>hdd: ATAPI 48X DVD-ROM DVD-R CD-R/RW drive, 2048kB Cache,
    UDMA(33)
    Feb 17 19:20:01 bitis-gabonica kernel: Idle: local softirq pending:
    0020<3>Idle: local softirq pending: 0020<3>Idle: local softirq
    pending: 0020<7>PM: Removing info for No Bus:vcs7

    cat /proc/interrupts
    CPU0 CPU1
    0: 232838 0 IO-APIC-edge timer
    1: 401 0 IO-APIC-edge i8042
    7: 0 0 IO-APIC-edge parport0
    8: 1 0 IO-APIC-edge rtc
    9: 1 0 IO-APIC-fasteoi acpi
    12: 4 0 IO-APIC-edge i8042
    14: 319 0 IO-APIC-edge ide0
    15: 1612 0 IO-APIC-edge ide1
    16: 16494 0 IO-APIC-fasteoi uhci_hcd:usb3, libata
    17: 4670 0 IO-APIC-fasteoi uhci_hcd:usb1, uhci_hcd:usb4
    18: 0 0 IO-APIC-fasteoi uhci_hcd:usb2
    19: 2 0 IO-APIC-fasteoi ehci_hcd:usb5
    20: 2822 0 IO-APIC-fasteoi Intel ICH5
    21: 2881 0 IO-APIC-fasteoi eth1
    22: 58 0 IO-APIC-fasteoi eth0
    NMI: 0 0
    LOC: 232562 232846
    ERR: 0
    MIS: 0

    I can confirm that this is ICH5 SATA controller problem.

    Regards,
    Michal

    --
    Michal K. K. Piotrowski
    LTG - Linux Testers Group (PL)
    (http://www.stardust.webpages.pl/ltg/)
    LTG - Linux Testers Group (EN)
    (http://www.stardust.webpages.pl/linux_testers_group_en/)
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