Phew. That makes sense. :) -----Original Message----- From: <tao.peng@xxxxxxx> Date: Wed, 14 Sep 2011 11:56:27 To: <bhalevy@xxxxxxxxxx> Cc: <rees@xxxxxxxxx>; <linux-nfs@xxxxxxxxxxxxxxx> Subject: RE: NULL pointer dereference during mount Hi, Benny, OK, I found the problem. It is because I was building nfs module, instead of rebuilding the whole kernel. commit bea6cd74 in pnfs-all-latest branch changes struct super_block by adding s_pnfs_op pointer. Then sb->s_security of the new module is translated into accessing sb->s_xattr, which is NULL, and causes the oops. After rebuilding the kernel, I don't get it any more. Sorry for the noise... Cheers, Tao ________________________________________ From: linux-nfs-owner@xxxxxxxxxxxxxxx [linux-nfs-owner@xxxxxxxxxxxxxxx] On Behalf Of tao.peng@xxxxxxx [tao.peng@xxxxxxx] Sent: Wednesday, September 14, 2011 3:53 PM To: bhalevy@xxxxxxxxxx Cc: rees@xxxxxxxxx; linux-nfs@xxxxxxxxxxxxxxx Subject: RE: NULL pointer dereference during mount > -----Original Message----- > From: linux-nfs-owner@xxxxxxxxxxxxxxx [mailto:linux-nfs-owner@xxxxxxxxxxxxxxx] > On Behalf Of Benny Halevy > Sent: Wednesday, September 14, 2011 2:29 PM > To: Peng, Tao > Cc: rees@xxxxxxxxx; linux-nfs@xxxxxxxxxxxxxxx > Subject: Re: NULL pointer dereference during mount > > I couldn't reproduce this with selinux neither disabled nor enforcing. > What's your selinux configuration? I didn't changed selinux config so it is the default on Fedora15 /etc/selinux/config: SELINUX=enforcing SELINUXTYPE=targeted /etc/selinux/semanage.conf: module-store = direct expand-check=0 usepasswd=False Cheers, Tao > > Benny > > On 2011-09-13 18:43, tao.peng@xxxxxxx wrote: > > > > ________________________________________ > > From: Jim Rees [rees@xxxxxxxxx] > > Sent: Tuesday, September 13, 2011 8:42 PM > > To: Peng, Tao > > Cc: bhalevy@xxxxxxxxxx; linux-nfs@xxxxxxxxxxxxxxx > > Subject: Re: NULL pointer dereference during mount > > > > tao.peng@xxxxxxx wrote: > > > > After rebasing to your pnfs-all-latest branch, I always got bellow NULL > > pointer dereference for both nfsv4 and pnfs. Do you know of any recent > > change that can cause this? > > > > "git diff" shows no change in the nfs client between my for-benny branch and > > benny's pnfs-all-latest branch. And the mount works for me. But the first > > thing I always do on a fresh Fedora install is disable selinux. Maybe > > something changed in selinux? > > [PT] Just tested 3.1-rc6 and it is working properly. So I think it should be caused by > nfs changes.-- > > To unsubscribe from this list: send the line "unsubscribe linux-nfs" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- > To unsubscribe from this list: send the line "unsubscribe linux-nfs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html ÿôèº{.nÇ+?·?®??+%?Ëÿ±éݶ¥?wÿº{.nÇ+?·¥?{±þwìþ)í?æèw* jg¬±¨ ¶????Ý¢jÿ¾«þG«?éÿ¢¸ ¢·¦j:+v?¨?wèjØm¶?ÿþø ¯ù ®w¥þ?àþf£¢·h??â?úÿ?Ù¥
