Hello,
I am running a vanilla 2.6.23 kernel and am experiencing (seemingly)

random hangs.  Below is a piece of dmesg and my kernel config, along

with a few snippets from /var/log/messages showing a 5 minute hang

(and another hang, but I wasn't at the computer at that time).
This has happened probably over 10 times all told, now.  The first few

times I just hard-booted the machine, today I decided to be patient,

and after 5 minutes it became usable again.
I've run memtest on it, so I don't think it's the memory...  Any help

is greatly appreciated!
As this is my first post, I apologize in advance if I have done

something stupid..!
Thanks,
Joshua Roys
dmesg:

Linux version 2.6.23 (root@orannis) (gcc version 4.2.1 (Gentoo 4.2.1

p1.0)) #1 Fri Oct 12 16:55:58 EDT 2007

ACPI: RSDP 000FEC00, 0014 (r0 DELL  )

ACPI: RSDT 000FCC05, 0040 (r1 DELL    GX280          7 ASL        61)

ACPI: FACP 000FCC45, 0074 (r1 DELL    GX280          7 ASL        61)

ACPI: DSDT FFFD060C, 30BF (r1   DELL    dt_ex     1000 MSFT  100000D)

ACPI: FACS 1F686C00, 0040

ACPI: SSDT FFFD3808, 00BA (r1   DELL    st_ex     1000 MSFT  100000D)

ACPI: APIC 000FCCB9, 0072 (r1 DELL    GX280          7 ASL        61)

ACPI: BOOT 000FCD2B, 0028 (r1 DELL    GX280          7 ASL        61)

ACPI: ASF! 000FCD53, 0067 (r16 DELL    GX280          7 ASL        61)

ACPI: MCFG 000FCDBA, 003E (r1 DELL    GX280          7 ASL        61)

ACPI: HPET 000FCDF8, 0038 (r1 DELL    GX280          7 ASL        61)

ACPI: PM-Timer IO Port: 0x808

ACPI: HPET id: 0x8086a201 base: 0xfed00000

Kernel command line: root=/dev/sda2

Initializing CPU#0

Detected 2660.302 MHz processor.

hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0

hpet0: 3 64-bit timers, 14318180 Hz

Calibrating delay using timer specific routine.. 5324.67 BogoMIPS (lpj=10649351)

CPU: After generic identify, caps: bfebfbff 00100000 00000000 00000000

0000451d 00000000 00000000 00000000

monitor/mwait feature present.

using mwait in idle threads.

CPU: Trace cache: 12K uops, L1 D cache: ...
[ message continues ]

What was the last kernel version you were using that didn't show the issue?
Could you disable CONFIG_HANGCHECK_TIMER  in your .config? Just to
Another thing to try: Boot with "clocksource=hpet" and verify that

avoids or triggers the issue. If it triggers the issue does it go away

with "clocksource=acpi_pm"?
thanks

-john

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We're seeing reports of this in Fedora 8, kernel 2.6.23;
https://bugzilla.redhat.com/show_bug.cgi?id=319441

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Hello,
I tried 2.6.21 and still had the same problem, I was going to back

farther but then I decided to try a few things with my 2.6.23 config.
$ diff config-2.6.23 newconfig-2.6.23-gentoo

140,151d139

< CONFIG_CPU_FREQ=y

< CONFIG_CPU_FREQ_TABLE=y

< CONFIG_CPU_FREQ_DEBUG=y

< CONFIG_CPU_FREQ_STAT=y

< CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y

< CONFIG_CPU_FREQ_GOV_PERFORMANCE=y

< CONFIG_CPU_FREQ_GOV_USERSPACE=y

< CONFIG_CPU_FREQ_GOV_ONDEMAND=y

< CONFIG_X86_ACPI_CPUFREQ=y

< CONFIG_X86_P4_CLOCKMOD=y

< CONFIG_X86_ACPI_CPUFREQ_PROC_INTF=y

< CONFIG_X86_SPEEDSTEP_LIB=y

488,490d477

< CONFIG_DEBUG_KERNEL=y

< CONFIG_DETECT_SOFTLOCKUP=y

< CONFIG_SCHED_DEBUG=y

492d478

< CONFIG_FORCED_INLINING=y
config-2.6.23 is the vanilla kernel's config that was experiencing the

hangs.  2.6.23-gentoo was also experiencing the hangs.  Then, I

disabled CPU frequency scaling (and a few other things I guess,

looking at the diff..) and recompiled and..  no hangs yet.  Uptime 3

and a half days.
If you wish I can use a vanilla kernel.
Joshua Roys

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