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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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