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Date:      Wed, 25 Apr 2012 16:07:34 -0400
From:      Arnaud Lacombe <lacombar@gmail.com>
To:        freebsd-stable <freebsd-stable@freebsd.org>,  FreeBSD Current <freebsd-current@freebsd.org>
Subject:   Re: Complete hang on 9.0-RELEASE
Message-ID:  <CACqU3MW3cEHOoggTNNLza2_akwyCtZnH=Bimm%2BoM7HbfoeL1og@mail.gmail.com>
In-Reply-To: <CACqU3MXcvT=nQrrJn6cyKY3vB76gkz1PGR2fCy%2Bip_2uJ-NkoQ@mail.gmail.com>
References:  <CACqU3MUefo4mG3GdZnj6kxxFx4H_M3-NLys8pCKptqNU4r_ywA@mail.gmail.com> <CACqU3MWx5S-v4jya2JEtT6d=9TOXcyR_Do8yybBY8%2Bkg16HpxA@mail.gmail.com> <CACqU3MWSyr_toZcOvQrNpLxX=ytNyDfDxpVKxxhC3%2BBACO6HPw@mail.gmail.com> <CACqU3MXcvT=nQrrJn6cyKY3vB76gkz1PGR2fCy%2Bip_2uJ-NkoQ@mail.gmail.com>

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Hi,

On Sat, Apr 21, 2012 at 4:19 AM, Arnaud Lacombe <lacombar@gmail.com> wrote:
> Hi,
>
> On Wed, Apr 18, 2012 at 2:22 AM, Arnaud Lacombe <lacombar@gmail.com> wrot=
e:
>> Hi,
>>
>> On Mon, Apr 16, 2012 at 5:50 PM, Arnaud Lacombe <lacombar@gmail.com> wro=
te:
>>> [...]
>>> I reproduced the previous problem on 10-CURRENT from r233917, on the
>>> following platform (here running 8.2-RELEASE):
>>>
>>> FreeBSD is a registered trademark of The FreeBSD Foundation.
>>> FreeBSD 8.2-RELEASE #0: Thu Feb 17 02:41:51 UTC 2011
>>> =A0 =A0root@mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64
>>> Timecounter "i8254" frequency 1193182 Hz quality 0
>>> CPU: Intel(R) Atom(TM) CPU D525 =A0 @ 1.80GHz (1800.01-MHz K8-class CPU=
)
>>> =A0Origin =3D "GenuineIntel" =A0Id =3D 0x106ca =A0Family =3D 6 =A0Model=
 =3D 1c =A0Stepping =3D 10
>>> =A0Features=3D0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MT=
RR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
>>> =A0Features2=3D0x40e31d<SSE3,DTES64,MON,DS_CPL,TM2,SSSE3,CX16,xTPR,PDCM=
,MOVBE>
>>> =A0AMD Features=3D0x20100800<SYSCALL,NX,LM>
>>> =A0AMD Features2=3D0x1<LAHF>
>>> =A0TSC: P-state invariant
>>> real memory =A0=3D 2136539136 (2037 MB)
>>> avail memory =3D 2043772928 (1949 MB)
>>> ACPI APIC Table: <010312 APIC0947>
>>> FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
>>> FreeBSD/SMP: 1 package(s) x 2 core(s) x 2 HTT threads
>>> =A0cpu0 (BSP): APIC ID: =A00
>>> =A0cpu1 (AP/HT): APIC ID: =A01
>>> =A0cpu2 (AP): APIC ID: =A02
>>> =A0cpu3 (AP/HT): APIC ID: =A03
>>>
>>> Complete system freeze while running about 2400 threads. I had to
>>> power cycle the system to get it back alive. I discussed a way to
>>> debug this with attilio@ on freebsd-stable@, but still did not had
>>> time to implement it.
>>>
>> 10-CURRENT from r233917 hanged again today while running 3600 threads.
>> I enabled WITNESS and INVARIANTS on that specific kernel, secretly
>> hoping that they would trigger some meaningful information, but they
>> did not. I would guess my last attempt is to enable SW_WATCHDOG, and
>> gather some state information out of DDB when the watchdog trigger, if
>> it does...
>>
>> Btw, this issue seems to be specifically happening on Atom/ICH8M
>> platform running amd64 kernel, as I've never seen it on other
>> platforms, and yet ran extensive tests. I am not entirely sure it
>> happens on i386. I would need to check.
>>
> For the record, 9.0-RELEASE i386 has been running the test for about 2
> days on the D510 platform without any hang so far. I'll keep it
> running all week-end to give me a better idea.
>
... or I have been too eager to expect an amd64 only issue. Thanks to
some nasty virus which stuck me in my bed for two days, I finally got
FreeBSD 9.0-RELEASE i386 stuck while running a single, 4000 threads,
process. I guess it's time to play with SW_WATCHDOG and DDB.

As a side note, the D510 platform seem to be much harder to hang than
the D525...

 - Arnaud



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