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List:       freebsd-hackers
Subject:    Re: 10.1-STABLE one week old from svn - random hangs
From:       Wojciech Puchar <wojtek () puchar ! net>
Date:       2014-12-08 7:38:08
Message-ID: alpine.BSF.2.11.1412080837050.6093 () laptop
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already sent you kernel messages with debugging diags etc. enabled.

lots of them and crashes easily repeatable.

got back to 10-STABLE from 2014.06.06 + manually applied patched from 
security advisories after.

NONE of errors happens, no crashes so far.

On Sun, 7 Dec 2014, Alfred Perlstein wrote:

>
>
>> On Dec 7, 2014, at 5:25 AM, Wojciech Puchar <wojtek@puchar.net> wrote:
>>
>> no crashdump. system does not panic
>> so i cannot do this
>
> That is actually better as you can run ddb scripts or if you what you can force a crash.
>
> Do sysctl -a |grep panic
>
>
> Then set the sysctl node to panic.
>
>
>>
>>> On Sun, 7 Dec 2014, Alfred Perlstein wrote:
>>>
>>> Can you enable crashdumps please and then send a traceback?
>>>
>>>
>>> https://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug.html
>>>
>>> These two are most helpful:
>>> https://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug.html#kerneldebug-obtain
>>> https://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug-gdb.html
>>>
>>>
>>>> On 12/7/14, 3:36 AM, Lev Serebryakov wrote:
>>>> -----BEGIN PGP SIGNED MESSAGE-----
>>>> Hash: SHA512
>>>>> On 07.12.2014 12:40, Wojciech Puchar wrote:
>>>>> The problem. At random moment system I/O stops. If you are running
>>>>> top at this moment, there are lots of prosesses stalled in vnread
>>>>> or biord. network keeps running, processes that doesn't need I/O
>>>>> still runs.
>>>>> top often reports at least 10MB free memory.
>>>>> seems like a deadlock. Anyone know that problem. How to trace it
>>>>> down?
>>>>  Looks like I have same problem sometimes.  And you could not run any
>>>> new process, you could not login on console, but you could switch
>>>> virtual consoles & if "top" is running on one of them, it doesn't hang
>>>> itself, right?
>>>>
>>>>  I get this typically when "svnsync" synchronize my local FreeBSD repo
>>>> mirror and after that FS (UFS2 with SUJ) with my repo is heavily damaged.
>>>> - -- // Lev Serebryakov AKA Black Lion
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>>>> =R88v
>>>> -----END PGP SIGNATURE-----
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