FreeBSD 7.1-PRERELEASE-p1, panic: dqget: free dquot isn't

[Frode Nordahl]

On 5. des.. 2008, at 20.59, Kostik Belousov wrote:

> On Fri, Dec 05, 2008 at 08:11:02PM +0100, Frode Nordahl wrote:
>>
>> 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?
>
> There is a possibility. Please inform me about the weekend burn-test
> results. If results are encouranging, I am almost sure that I can
> squeeze it into the release.


The test has run trough the weekend without any incidents! I really  
hope this patch will make it into the release.

Thank you for your help solving this issue!

--
Frode Nordahl