Date: Thu, 9 Aug 2018 07:05:57 -0700 (PDT) From: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> To: Rick Macklem <rmacklem@uoguelph.ca> Cc: Konstantin Belousov <kostikbel@gmail.com>, "freebsd-current@FreeBSD.org" <freebsd-current@freebsd.org>, "peter@holm.cc" <peter@holm.cc> Subject: Re: ffs_truncate3 panics Message-ID: <201808091405.w79E5v7n017582@pdx.rh.CN85.dnsmgr.net> In-Reply-To: <YTOPR0101MB18205CDE34ABCC2345C3F172DD250@YTOPR0101MB1820.CANPRD01.PROD.OUTLOOK.COM>
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> Konstantin Belousov wrote: > [stuff snipped] > >> >Can you print the only buffer on the clean queue when the panic occur ? > >> ffst3 vtyp=1 bodirty=0 boclean=1 > >> buf at 0x428a110 > >> b_flags = 0x20001020<vmio,reuse,cache>, b_xflags=0x2<clean>, b_vflags=0x0 > >> b_error = 0, b_bufsize = 4096, b_bcount = 4096, b_resid = 0 > >> b_bufobj = (0xfd8ba94), b_data = 0x5170000, b_blkno = -1, b_lblkno = -1, b_dep = 0 > >> b_kvabase = 0x5170000, b_kvasize = 32768 > >So the buffer was indeed for extended attrs, and never written to the disk. > >I am quite interested what was the inode content prior to the truncation, > >esp. the di_extsize. > Just in case it wasn't clear, this buffer is on the clean list and not the dirty one. > (Does this mean it somehow got onto the "clean list" without being written to disk?) > > >Could you try to formulate a way to reproduce the panic so that Peter > >can recreate it, please ? > I doubt it. It would require him doing a pNFS setup with multiple systems. > (At least that is the only way I reproduce it and I sometimes go a week of testing > before I see them.) > It would be great to have more testers for the pNFS server stuff, but I doubt it > would fit into Peter's setup? It should be possible to design a set of VM's using bhyve, xen or ones favorite hypervisor/virtulization platform to do "more" pNFS testing. If you could provide a rought machine set needed to have a functional test bed, and what should be done to "test" for problems I think it should be possible to get you some addition testers. Thanks, > I can add printf()s anywhere you suggest, but I'm not sure how you would catch > this case sooner? (For example, I could print out di_extsize at the beginning of > ffs_truncate(), if that would help?) > > rick > [more stuff snipped] -- Rod Grimes rgrimes@freebsd.org
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