Date: Wed, 29 Apr 2009 14:40:02 -0400 From: Ben Kelly <ben@wanderview.com> To: current@freebsd.org Subject: Re: [patch] zfs livelock and thread priorities Message-ID: <DA5E47A7-8D3C-4D79-A36E-4460ADC9E3F3@wanderview.com> In-Reply-To: <A83EA714-1EB5-41C1-91E2-FD031FD0DE0E@wanderview.com> References: <AC3C4C3F-40C6-4AF9-BAF3-2C4D1E444839@wanderview.com> <ed91d4a80904142135n429dea52o672abf51116fa707@mail.gmail.com> <ed91d4a80904241816r28531a04r2dc70fa8960d430e@mail.gmail.com> <bc2d970904241947r50576efbgc93164a9e4dd297d@mail.gmail.com> <ed91d4a80904242059n3642a40aud55df6d1b6a1695@mail.gmail.com> <FC83DB1E-6C08-4BD4-8BC9-437D714FEE9E@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>
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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_deadlock.diff >>> >>> The patch is updated in the same location above. >> >> There's a fatal typo in the patch: >> >> - ZFS_OBJ_HOLD_ENTER(zfsvfs, z_id); >> + locked == ZFS_OBJ_HOLD_TRYENTER(zfsvfs, z_id); >> ^^^^ > > Yikes! Thanks for catching this! > > The patch has been updated at the same URL. If anyone has patched > their system please grab the new version. Sorry for the confusion. Argh! The patch was still broken even after this fix. Apparently when I tested my taskqueue solution I forgot to do a make installkernel. For some reason the taskqueue approach deadlocks my server at home under normal conditions. Therefore I have reverted the patch to use the simple return. I still don't think this is the right solution, but I don't have time to completely figure out what is going on right now. Again, sorry for the mess! - Ben
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