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

[Kostik Belousov]

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.
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