Complete hang on 9.0-RELEASE

[Arnaud Lacombe]

Hi,

On Wed, Apr 18, 2012 at 2:22 AM, Arnaud Lacombe <lacombar at gmail.com> wrote:
> Hi,
>
> On Mon, Apr 16, 2012 at 5:50 PM, Arnaud Lacombe <lacombar at gmail.com> wrote:
>> [...]
>> 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
>>    root at 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   @ 1.80GHz (1800.01-MHz K8-class CPU)
>>  Origin = "GenuineIntel"  Id = 0x106ca  Family = 6  Model = 1c  Stepping = 10
>>  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
>>  Features2=0x40e31d<SSE3,DTES64,MON,DS_CPL,TM2,SSSE3,CX16,xTPR,PDCM,MOVBE>
>>  AMD Features=0x20100800<SYSCALL,NX,LM>
>>  AMD Features2=0x1<LAHF>
>>  TSC: P-state invariant
>> real memory  = 2136539136 (2037 MB)
>> avail memory = 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
>>  cpu0 (BSP): APIC ID:  0
>>  cpu1 (AP/HT): APIC ID:  1
>>  cpu2 (AP): APIC ID:  2
>>  cpu3 (AP/HT): APIC ID:  3
>>
>> 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.

 - Arnaud