Date: Thu, 5 Dec 2013 10:25:56 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: Paolo Pinto <paolo.pinto@netasq.com>, nicolas dumont <nicolas.dumont@netasq.com>, freebsd-geom@freebsd.org Subject: Re: geom_uzip, panic: bio_length in mdstart_vnode() Message-ID: <20131205082556.GA59496@kib.kiev.ua> In-Reply-To: <20131205020742.GU55638@funkthat.com> References: <529F2748.2060900@netasq.com> <20131204162029.GV59496@kib.kiev.ua> <20131205020742.GU55638@funkthat.com>
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[-- Attachment #1 --] On Wed, Dec 04, 2013 at 06:07:43PM -0800, John-Mark Gurney wrote: > Konstantin Belousov wrote this message on Wed, Dec 04, 2013 at 18:20 +0200: > > On Wed, Dec 04, 2013 at 01:59:52PM +0100, Paolo Pinto wrote: > > > Hi list! > > > > > > My kernel is compiled with option INVARIANTS and I get a reproducible > > > kernel panic when trying to read data from a GEOM based compressed > > > memory disk: > > > > > > Unread portion of the kernel message buffer: > > > panic: bio_length 140288 > > > cpuid = 3 > > > KDB: stack backtrace: > > > #0 0xffffffff80909726 at kdb_backtrace+0x66 > > > #1 0xffffffff808d0fa8 at panic+0x1d8 > > > #2 0xffffffff80595949 at mdstart_vnode+0x619 > > > > The issue is that geom_uzip creates bios which are larger than MAXPHYS. > > Shouldn't geom_uzip be fixed to honor MAXPHYS? By all means, fix it. > > > As a workaround, the following patch should be enough. It only fires > > assert when md really uses pbuf, and since geom_uzip knows nothing > > about unmapped bio, the assertion must not trigger. > > Ummm... what's the point of MAXPHYS if we allow IO larger than it? This is rhetorical question, right ? [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (FreeBSD) iQIcBAEBAgAGBQJSoDiTAAoJEJDCuSvBvK1BGcwP/Rocdfagi0MjGmqknHJC3Xg2 X/nG0tr6nY/sga7Hbsip5v/jwp9wt3Pfd3v1q6UQ2qPQgNR+Gbs+4XHnLuFf/Ap1 8YZRn7lvVJ/jEZY8OeM/srOOlEddC9oOPTTQ0XIgpP5z3rlSHiy+8ab+s+suS1X1 H25Fhr9gkNFwNWl489+oitzJldfjp0/7oY2jIaIy4jzTAiwCUuz8hBUbeVZxXM0Y K8KGlsWdgSRWh9JmPKKTr6ycGYxwKkysktwQ+fKXRtm8j/3pQ1fJ11vRLDopDM8d +oj+s075rzylrcLlrrLiUtOZ6ykTZ7RQ3YPQkw5AikbBtFq2xP/jyQRpNKahzED4 vY5FhbH9OFuURb9n2AAtv0YWy/sCl2SmZLI3CkmmhVE8IBLdB/fWBUFGCwhNeyHZ 6J8ZU3jAXoFGcXfEzkJYULYnnPyrOeFp2TJuogjHRA/AUDwoWG5uDjtzjyKLJYBj WY5NiDCn8CpLACX1xw3VjHUBP2Y2OTITUMl5gaicQWd7YzORae1Lf6y3YkzTj627 s0mHwnSGVYvODhuQTav3NwOTitwEuf49q8QrpQ3QDX2ylSnd/WMF3Vf3nuA8pxTk jmNl58/mXSAl7i5ynv3b1+H3vbx2qYjny9nhvKFKwDb3VZVpJS3dUP8/QRK1/H2T OJLBJlwJdEyaVZv0m/ST =MGua -----END PGP SIGNATURE-----
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