Date: Mon, 29 Jun 2009 16:06:11 +0200 From: Attilio Rao <attilio@freebsd.org> To: pluknet <pluknet@gmail.com> Cc: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: [nfs] process locks in "bo_wwait" on 6.4 Message-ID: <3bbf2fe10906290706q349211c1pe00cc57cc18a1315@mail.gmail.com> In-Reply-To: <a31046fc0906290659t44d11818x21dfb560ee509b44@mail.gmail.com> References: <a31046fc0906260944h68eed26bs256dcad1f29871ff@mail.gmail.com> <a31046fc0906260951i66c239e1yfac9048d69784209@mail.gmail.com> <a31046fc0906290329p3e9cff1dwa89c8bb88736fed7@mail.gmail.com> <3bbf2fe10906290458v3d57441ar44c4ed8f36c957f@mail.gmail.com> <a31046fc0906290555ib9abf4fy90502eb01e2ef8d3@mail.gmail.com> <3bbf2fe10906290611j683a0ddawbd524e406e832d54@mail.gmail.com> <a31046fc0906290618r31e5bfb0h9e267fadef53408a@mail.gmail.com> <3bbf2fe10906290620r7005f47dtfef8becc7f439515@mail.gmail.com> <a31046fc0906290659t44d11818x21dfb560ee509b44@mail.gmail.com>
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2009/6/29 pluknet <pluknet@gmail.com>: > 2009/6/29 Attilio Rao <attilio@freebsd.org>: >> 2009/6/29 pluknet <pluknet@gmail.com>: >>> 2009/6/29 Attilio Rao <attilio@freebsd.org>: >>>> 2009/6/29 pluknet <pluknet@gmail.com>: >>>>> 2009/6/29 Attilio Rao <attilio@freebsd.org>: >>>>>> 2009/6/29 pluknet <pluknet@gmail.com>: >>>>>>> 2009/6/26 pluknet <pluknet@gmail.com>: >>>>>>>> 2009/6/26 pluknet <pluknet@gmail.com>: >>>>>>>>> Hello. >>>>>>>>> >>>>>>>>> While building a module on nfs mounted /usr/src >>>>>>>>> I got an unkillable process waiting forever in bo_wwait. >>>>>>>> >>>>>>>> Small note: iface on NFS server has mtu changed from 1500 to 1450. >>>>>>>> Can this be a source of the problem? >>>>>>> >>>>>>> This is 100% reproducible. Lock in the same place. Any hints? >>>>>> >>>>>> Can you also show the value of ps? >>>>>> A precise map of what processes are doing would give an help. >>>>>> Also would be useful to printout traces for other threads and not only >>>>>> the stucked one. >>>>>> >>>>> >>>>> >From another run: >>>> >>>> I'm unable to see who would be locking the buffer object in question. >>>> Do you have INVARIANT_SUPPORT/INVARIANTS on? >>> >>> Yes, I do both. >>> >>>> What revision of /usr/src/sys/kern/vfs_bio.c are you running with? >>>> >>> >>> As of 6.4-R: CVS rev 1.491.2.12.4.1 / SVN rev 183531. >> >> Please try this patch and report. >> >> Thanks, >> Attilio >> >> --- src/sys/nfsclient/nfs_vnops.c 2008/02/13 20:44:18 1.281 >> +++ src/sys/nfsclient/nfs_vnops.c 2008/03/22 09:15:15 1.282 >> @@ -33,7 +33,7 @@ >> */ >> >> #include <sys/cdefs.h> >> -__FBSDID("$FreeBSD: >> /usr/local/www/cvsroot/FreeBSD/src/sys/nfsclient/nfs_vnops.c,v 1.281 >> 2008/02/13 20:44:18 attilio Exp $"); >> +__FBSDID("$FreeBSD: >> /usr/local/www/cvsroot/FreeBSD/src/sys/nfsclient/nfs_vnops.c,v 1.282 >> 2008/03/22 09:15:15 jeff Exp $"); >> > > Do you refer to the whole svn r177493, or is its nfs part will be enough? > This only vfs_vnops.c diff seems not applicable without underneath > kernel part changes. > > I'll try. Thanks. The NFS part should be enough, though I don't understand why it doesn't trigger a panic on STABLE_6 as long as, at least in my revision, there is an assert for the buffer object lock to be held in bufobj_wwait(). What's your sys/kern/vfs_bio.c rev? Thanks, Attilio -- Peace can only be achieved by understanding - A. Einstein
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