Date: Mon, 29 Jun 2009 17:59:12 +0400 From: pluknet <pluknet@gmail.com> To: Attilio Rao <attilio@freebsd.org> Cc: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: [nfs] process locks in "bo_wwait" on 6.4 Message-ID: <a31046fc0906290659t44d11818x21dfb560ee509b44@mail.gmail.com> In-Reply-To: <3bbf2fe10906290620r7005f47dtfef8becc7f439515@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>
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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 onl=
y
>>>>> 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 =A0 =A0 =A0 2008/02/13 20:44:18 =A0 =A0=
1.281
> +++ src/sys/nfsclient/nfs_vnops.c =A0 =A0 =A0 2008/03/22 09:15:15 =A0 =A0=
1.282
> @@ -33,7 +33,7 @@
> =A0*/
>
> =A0#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.
--=20
wbr,
pluknet
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