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From: Frode Nordahl <frode@nordahl.net>
To: Kostik Belousov <kostikbel@gmail.com>
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Date: Fri, 5 Dec 2008 20:11:02 +0100
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Cc: freebsd-stable@freebsd.org
Subject: Re: FreeBSD 7.1-PRERELEASE-p1, panic: dqget: free dquot isn't
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On 4. des.. 2008, at 13.20, Frode Nordahl wrote:

> On 4. des.. 2008, at 13.07, Kostik Belousov wrote:
>
>> On Thu, Dec 04, 2008 at 08:12:45AM +0100, Frode Nordahl wrote:
>>> Got it!
>>>
>>> panic: dqget: free dquot isn't dq=0xffffff00b3d27000
>>> (kgdb) p/x *(struct dquot *)0xffffff00b3d27000
>>> $1 = {dq_hash = {le_next = 0x0, le_prev = 0xffffff010b9da700},
>>> dq_freelist = {
>>>   tqe_next = 0xffffff0055e2de00, tqe_prev = 0xffffffff80b03710},
>>> dq_lock = {
>>>   lock_object = {lo_name = 0xffffffff8088c21c, lo_type =
>>> 0xffffffff8088c21c,
>>>     lo_flags = 0x1030000, lo_witness_data = {lod_list = {stqe_next
>>> = 0x0},
>>>       lod_witness = 0x0}}, mtx_lock = 0x4, mtx_recurse = 0x0},
>>> dq_flags = 0xc, dq_type = 0x0, dq_cnt = 0x0, dq_id = 0x16a37d,
>>> dq_ump = 0xffffff00038e1600, dq_dqb = {dqb_bhardlimit = 0x0,
>>>   dqb_bsoftlimit = 0x0, dqb_curblocks = 0x0, dqb_ihardlimit = 0x0,
>>>   dqb_isoftlimit = 0x0, dqb_curinodes = 0x1, dqb_btime = 0x493ef2b5,
>>>   dqb_itime = 0x493ef2b5}}
>>>
>>> Let me know if I can provide any more information!
>>>
>>> Updated the crashinfo archive you got an URL to yesterday if you  
>>> want
>>> to poke around yourself.
>>
>> Please, try the patch below, it should fix a race I see. Quite  
>> possible,
>> this is what you tripped over.
>
> Thanks! I will apply the patch and retry the steps that lead to the  
> panic!


Good news! I have run through two and have started on the third  
iteration of the test that lead to the panic without your patch, and  
no panic so far!

I will let it run through the weekend, it prooves usefull as a burn-in- 
test as well :-)

Will this patch make it into 7.1-RELEASE?

--
Frode Nordahl