Date: Thu, 9 Aug 2018 01:39:20 +0000 From: Rick Macklem <rmacklem@uoguelph.ca> To: Konstantin Belousov <kostikbel@gmail.com> Cc: "freebsd-current@FreeBSD.org" <freebsd-current@FreeBSD.org>, "peter@holm.cc" <peter@holm.cc> Subject: Re: ffs_truncate3 panics Message-ID: <YTOPR0101MB18205CDE34ABCC2345C3F172DD250@YTOPR0101MB1820.CANPRD01.PROD.OUTLOOK.COM> In-Reply-To: <20180808221647.GH1884@kib.kiev.ua> References: <YTOPR0101MB18206289DDED97BE9DD38D14DD270@YTOPR0101MB1820.CANPRD01.PROD.OUTLOOK.COM> <20180807131445.GC1884@kib.kiev.ua> <YTOPR0101MB18207C97903D3058A15091FFDD260@YTOPR0101MB1820.CANPRD01.PROD.OUTLOOK.COM>, <20180808221647.GH1884@kib.kiev.ua>
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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=3D1 bodirty=3D0 boclean=3D1 >> buf at 0x428a110 >> b_flags =3D 0x20001020<vmio,reuse,cache>, b_xflags=3D0x2<clean>, b_vflag= s=3D0x0 >> b_error =3D 0, b_bufsize =3D 4096, b_bcount =3D 4096, b_resid =3D 0 >> b_bufobj =3D (0xfd8ba94), b_data =3D 0x5170000, b_blkno =3D -1, b_lblkno= =3D -1, b_dep =3D 0 >> b_kvabase =3D 0x5170000, b_kvasize =3D 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 dou= bt it would fit into Peter's setup? I can add printf()s anywhere you suggest, but I'm not sure how you would ca= tch this case sooner? (For example, I could print out di_extsize at the beginni= ng of ffs_truncate(), if that would help?) rick [more stuff snipped]
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