Date: Thu, 30 Apr 2009 00:19:24 -0700 From: Kip Macy <kmacy@freebsd.org> To: Ben Kelly <ben@wanderview.com> Cc: Lawrence Stewart <lstewart@freebsd.org>, current@freebsd.org Subject: Re: [patch] zfs livelock and thread priorities Message-ID: <3c1674c90904300019w63f31ac0n141c3d5116eadb97@mail.gmail.com> In-Reply-To: <38E0E938-68DA-4D2E-8191-3CEC836A82E9@wanderview.com> References: <AC3C4C3F-40C6-4AF9-BAF3-2C4D1E444839@wanderview.com> <ed91d4a80904271839l49420c8rbcfd52dd6e72eb83@mail.gmail.com> <ed91d4a80904281111q3b9a3c45vc9fcf129dde8c10d@mail.gmail.com> <F86D3461-3ABD-4A56-B9A6-36857364DF4B@wanderview.com> <4D8E4457-89AA-4F19-9960-E090D3B8E319@wanderview.com> <20090429064303.GA2189@a91-153-125-115.elisa-laajakaista.fi> <A83EA714-1EB5-41C1-91E2-FD031FD0DE0E@wanderview.com> <DA5E47A7-8D3C-4D79-A36E-4460ADC9E3F3@wanderview.com> <49F8E71B.2020102@freebsd.org> <38E0E938-68DA-4D2E-8191-3CEC836A82E9@wanderview.com>
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--0016e645b83cfeb9740468c083dd Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable I have a system at work that I could lock up within minutes with fsstress. With this patch the system is now stable with large numbers of fsstress processes running. Provided I get the heads up from pjd, I will commit it. -Kip On Wed, Apr 29, 2009 at 6:56 PM, Ben Kelly <ben@wanderview.com> wrote: > On Apr 29, 2009, at 7:47 PM, Lawrence Stewart wrote: >> >> Ben Kelly wrote: >>> >>> On Apr 29, 2009, at 7:58 AM, Ben Kelly wrote: >>>> >>>> On Apr 29, 2009, at 2:43 AM, Jaakko Heinonen wrote: >>>>> >>>>> On 2009-04-28, Ben Kelly wrote: >>>>>>> >>>>>>> >>>>>>> http://www.wanderview.com/svn/public/misc/zfs/zfs_zinactive_deadloc= k.diff >>>>>> >>>>>> The patch is updated in the same location above. >>>>> >>>>> There's a fatal typo in the patch: >>>>> >>>>> - =A0 =A0ZFS_OBJ_HOLD_ENTER(zfsvfs, z_id); >>>>> + =A0 =A0locked =3D=3D ZFS_OBJ_HOLD_TRYENTER(zfsvfs, z_id); >>>>> =A0 =A0 =A0 =A0 =A0 ^^^^ >>>> >>>> Yikes! =A0Thanks for catching this! >>>> >>>> The patch has been updated at the same URL. =A0If anyone has patched t= heir >>>> system please grab the new version. =A0Sorry for the confusion. >>> >>> Argh! =A0The patch was still broken even after this fix. >>> Apparently when I tested my taskqueue solution I forgot to do a make >>> installkernel. =A0For some reason the taskqueue approach deadlocks my s= erver >>> at home under normal conditions. =A0Therefore I have reverted the patch= to use >>> the simple return. =A0I still don't think this is the right solution, b= ut I >>> don't have time to completely figure out what is going on right now. >>> Again, sorry for the mess! >> >> As far as I can tell, one of the developers is working on a patch to >> address the same issue you're discussing in this thread. He ran into it = on >> his SSD ZFS installation and the symptoms sound likely to be the same as >> what you're discussing. I believe he's testing a patch which is inspired= by >> the one the opensolaris guys used to fix the bug, which you can look at >> here: >> >> http://people.freebsd.org/~pjd/patches/vn_rele_hang.patch >> >> The open solaris one has major incompatibilities with FreeBSD so can't b= e >> applied directly. >> >> As soon as it's ready I think he'll be making it available for wider >> testing so stay tuned. >> >> Cheers, >> Lawrence >> >> PS Apologies if the issue you're working on is not the same as the one >> addressed by the opensolaris patch above. > > > Thank you! =A0This does appear to be the same issue and I look forward to > seeing the final fix. > > For now I've gone ahead and updated my patch with a naive adaptation of t= he > opensolaris diff. =A0It seems more correct than what I had and I was worr= ied > people would waste time testing my broken approach. =A0I've only been abl= e to > test it on my i386, non-SMP server however. > > Thanks again. > > - Ben > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org= " > --=20 All that is necessary for the triumph of evil is that good men do nothing. 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