linux-kernel - Re: 2.6.23 hang, unstable clocksource?

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Date:	Thu, 25 Oct 2007 19:28:29 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	john stultz <johnstul@...ibm.com>
CC:	Joshua Roys <roysjosh@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.23 hang, unstable clocksource?

On 10/25/2007 07:10 PM, john stultz wrote:
> On 10/16/07, Joshua Roys <roysjosh@...il.com> wrote:
>> 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.
> 
> What was the last kernel version you were using that didn't show the issue?
> Couple of things to try below:
> 
>> dmesg:
>> Linux version 2.6.23 (root@...nnis) (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: 16K
>> CPU: L2 cache: 256K
>> CPU: After all inits, caps: bfebfbff 00100000 00000000 0000b180
>> 0000451d 00000000 00000000 00000000
>> Intel machine check architecture supported.
>> Intel machine check reporting enabled on CPU#0.
>> CPU0: Intel P4/Xeon Extended MCE MSRs (12) available
>> CPU: Intel(R) Celeron(R) CPU 2.66GHz stepping 01
>> Checking 'hlt' instruction... OK.
>> ACPI: Core revision 20070126
>> Time: tsc clocksource has been installed.
>> Switched to high resolution mode on CPU 0
>> Real Time Clock Driver v1.12ac
>> hpet_resources: 0xfed00000 is busy
>> Hangcheck: starting hangcheck timer 0.9.0 (tick is 180 seconds, margin
>> is 60 seconds).
>> Hangcheck: Using get_cycles().
> 
> Could you disable CONFIG_HANGCHECK_TIMER  in your .config? Just to
> make sure it isn't flipping out.
> 
>> p4-clockmod: P4/Xeon(TM) CPU On-Demand Clock Modulation available
>>
>> - I missed this hang, according to /var/log/messages it occured at
>> 8:14pm last night (Oct 15)
>> - I ran ntpdate here to fix the time, which was off by 65 seconds.
>> Oct 16 13:43:01 orannis ntpdate[7326]: step time server 128.10.252.7
>> offset -65.263313 sec
>>
>> Clocksource tsc unstable (delta = 299948628229 ns)
>> Time: hpet clocksource has been installed.
> 
> 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"?
> 

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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