Date: Mon, 16 Aug 2010 23:43:39 +0400 From: Alexey Tarasov <me@lexasoft.ru> To: Kostik Belousov <kostikbel@gmail.com> Cc: freebsd-stable@freebsd.org, Alexey Tarasov <me@lexasoft.ru> Subject: Re: STABLE kernel panic: privileged instruction fault Message-ID: <4212B9F7-9B4B-466F-8AB8-2DCCAC50E52E@lexasoft.ru> In-Reply-To: <20100816193948.GW2396@deviant.kiev.zoral.com.ua> References: <D3520B14-5DB1-42B7-8D21-731D0BD45788@lexasoft.ru> <20100816184818.GS2396@deviant.kiev.zoral.com.ua> <E14B2DF6-3908-4429-A916-7A8731F7D510@lexasoft.ru> <20100816193112.GV2396@deviant.kiev.zoral.com.ua> <55B93A70-9AD1-46EC-B1A0-FC73780ABCDE@lexasoft.ru> <20100816193948.GW2396@deviant.kiev.zoral.com.ua>
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On Aug 16, 2010, at 11:39 PM, Kostik Belousov wrote:
> On Mon, Aug 16, 2010 at 11:35:36PM +0400, Alexey Tarasov wrote:
>>
>> On Aug 16, 2010, at 11:31 PM, Kostik Belousov wrote:
>>
>>> On Mon, Aug 16, 2010 at 11:21:15PM +0400, Alexey Tarasov wrote:
>>>> Hello Kostik!
>>>>
>>>> On Aug 16, 2010, at 10:48 PM, Kostik Belousov wrote:
>>>>
>>>>>>
>>>>> The backtrace make absolutely no sense. I would not trust kgdb anyway.
>>>>>
>>>>> Compile ddb in and do backtrace in console on the panic. Also, disassemble
>>>>> the kernel at the fault address. I am very curious which instruction causes
>>>>> this. This is stock GENERIC on the bare metal booted, right ?
>>>>
>>>> Yes, stock GENERIC.
>>>>
>>>> Please, check this out:
>>>>
>>>> Dump of assembler code from 0xffffff0060c0b700 to 0xffffff0060c0b780:
>>>
>>> Would be nice if you keep all requested data in one place, so that
>>> we do not need to search for the old mails to see the context.
>>>
>>> According to your previous mail, the fault happen at the
>>> address
>>> instruction pointer = 0x20:0xffffff8040d2cc83
>>> Your disassembled the stack instead. Please just do
>>> disass 0xffffff8040d2cc83,0xffffff8040d2cca0
>>> in kgdb.
>>>
>>> But also, I want to see the backtrace and disassembly output from ddb.
>>
>> (kgdb) disass 0xffffff8040d2cc83,0xffffff8040d2cca0
>> No function contains specified address.
> Err, it seems that old gdb accepts only spaces. Please try
> disass 0xffffff8040d2cc83 0xffffff8040d2cca0 instead.
(kgdb) disass 0xffffff8040d2cc83 0xffffff8040d2cca0
Dump of assembler code from 0xffffff8040d2cc83 to 0xffffff8040d2cca0:
0xffffff8040d2cc83: (bad)
0xffffff8040d2cc84: (bad)
0xffffff8040d2cc85: jg 0xffffff8040d2cc87
0xffffff8040d2cc87: add %al,(%rax)
0xffffff8040d2cc89: add %al,(%rax)
0xffffff8040d2cc8b: add %al,(%rax)
0xffffff8040d2cc8d: add %al,(%rax)
0xffffff8040d2cc8f: add %al,(%rax)
0xffffff8040d2cc91: add %al,(%rax)
0xffffff8040d2cc93: add %al,(%rax)
0xffffff8040d2cc95: add %al,(%rax)
0xffffff8040d2cc97: add %al,(%rcx)
0xffffff8040d2cc99: add %al,(%rax)
0xffffff8040d2cc9b: add %al,(%rax)
0xffffff8040d2cc9d: add %al,(%rax)
0xffffff8040d2cc9f: add %al,(%rax)
End of assembler dump.
>
>>
>> I will build kernel with DDB tomorrow, install it on some servers and wait for the panic occurs.
> Ok. Did you checked for such things as rootkits ?
I am noticing such panics only on this model of supermicro servers for a long! time under FreeBSD.
This servers were tested on huge workload under Linux and there were no problems.
I've installed and run chkrootkit now, there are no rootkits.
--
Alexey Tarasov
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