Date: Wed, 30 Dec 2009 19:40:02 GMT From: Manuel Tobias Schiller <mala@hinterbergen.de> To: freebsd-sparc64@FreeBSD.org Subject: Re: sparc64/142102: FreeBSD 8.0 kernel panics on sparc64 when accessing NFS Message-ID: <200912301940.nBUJe2KI068337@freefall.freebsd.org>
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The following reply was made to PR sparc64/142102; it has been noted by GNATS. From: Manuel Tobias Schiller <mala@hinterbergen.de> To: Marius Strobl <marius@alchemy.franken.de> Cc: dfr@freebsd.org, FreeBSD-gnats-submit@freebsd.org Subject: Re: sparc64/142102: FreeBSD 8.0 kernel panics on sparc64 when accessing NFS Date: Wed, 30 Dec 2009 20:32:55 +0100 On Wed, 30 Dec 2009 17:36:27 +0100 Marius Strobl <marius@alchemy.franken.de> wrote: > On Wed, Dec 30, 2009 at 01:25:55AM +0100, Manuel Tobias Schiller wrote: > > On Tue, 29 Dec 2009 19:53:58 +0100 > > Marius Strobl <marius@alchemy.franken.de> wrote: > > > Oh, sorry, I had a bug in there, the svc code used a stale > > > pointer to the mbuf with this. Could you please re-fetch > > > and try again? I can't guarantee that this fixes the hang > > > you experienced but at least in theory just re-aligning > > > the data can't make the issue with the unaligned access > > > any worse. Using the LOM or by breaking into the kernel > > > by sending a break you should be able to power-cycle/ > > > reboot the machine without removing the power cord should > > > it hang again though. > > > What NFS client and with which mount options are you > > > using to trigger is problem? > > > > > > Marius > > > > I managed to compile and test a kernel with your updated patch, and > > things seem to work. I'll try to stress-test it over the night by > > copying a few tens of gigabytes over and report back with the results. > > Doug, > > could you please review the following patch? The problem > apparently is that nfsm_srvmtofh_xx() assumes the 4-byte > alignment required by XDR so fha_extract_info() has to > ensure that the mbuf data is aligned accordingly. > http://people.freebsd.org/~marius/fha_extract_info_realign.diff > > Thanks, > Marius Marius, I did a stress-test of the patch by tarring 85 Gigabyte over NFS into a pipe, untarring them in a different NFS-mounted directory. I loaded the server machine by compiling a kernel in parallel for some time. Everything worked perfectly. Thanks for all your help! Manuel -- Homepage: http://www.hinterbergen.de/mala OpenPGP: 0xA330353E (DSA) or 0xD87D188C (RSA)
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