Jonathan: I meant to include a URL to that particular patch. Thanks for pointing it out.
I know next-to-nothing about kernel programming at this level - should I consider this a real fix in that a problem is actually resolved, or should I deploy this patch on my systems knowing that it's more of a band-aid? Thanks for getting back quickly. -- Tom Downes Associate Scientist and Data Center Manager Center for Gravitation, Cosmology and Astrophysics University of Wisconsin-Milwaukee 414.229.2678 On Thu, Dec 13, 2012 at 1:34 PM, Jonathan Nieder <jrnie...@gmail.com> wrote: > tags 695872 + upstream patch unreproducible > quit > > Hi Tom, > > Tom Downes wrote: > >> While running a shell script that looped over a couple hundred >> filesystems accessed via automoutning NFS exports (unmounted prior >> to running the script), there was a kernel panic that prevented >> further automounts from occurring. > > Thanks for reporting. > >> This problem seems very similar to bug #691764 filed under the >> autofs package but I believe the bug is really in the sunrpc module. > > In that report the panic is in different code, so I think they are > distinct. > >> I've found a patch described here, applied it to my system and have >> not experienced a crash since. I only ever experienced one crash, >> however, and unpatched systems are yet to crash. > > For reference: > > v2.6.38-rc1~407^2~38 kernel panic when mount NFSv4, 2010-12-20 > > Trond explains: > > | The panic place is: > | rpc_mkpipe > | __rpc_lookup_create() <=== find pipefile *idmap* > | __rpc_mkpipe() <=== pipefile is *idmap* > | __rpc_create_common() > | ****** BUG_ON(!d_unhashed(dentry)); ****** *panic* > | > | The test is wrong: we can find ourselves with a hashed negative dentry here > | if the idmapper tried to look up the file before we got round to creating > | it. > > It seems like a match and I think you're right that the patch would > fix it. Thanks for finding it. > > Hope that helps, > Jonathan -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
