Re: [V9fs-users] [V9fs-developer] rmdir causes warnings

[Jim G. <gar...@gm...>]

I haven't had time to try this on different kernels but as a data point,
this did NOT reproduce for me on Ubuntu kernel 3.2.0-32-generic (i686).

Jim

On Wed, Oct 24, 2012 at 8:48 AM, Marios Titas <red...@gm...> wrote:

> I decided to experiment with 9P and while it overall works fine I
> quite frequently get warnings like the following when I remove
> directories:
>
> [ 1112.863041] ------------[ cut here ]------------
> [ 1112.863046] WARNING: at fs/inode.c:280 drop_nlink+0x43/0x50()
> [ 1112.863047] Hardware name: 0862
> [ 1112.863053] Pid: 8718, comm: rm Tainted: G        W  O 3.5.7 #5
> [ 1112.863055] Call Trace:
> [ 1112.863058]  [<ffffffff81090e8a>] warn_slowpath_common+0x7a/0xb0
> [ 1112.863060]  [<ffffffff81090ed5>] warn_slowpath_null+0x15/0x20
> [ 1112.863062]  [<ffffffff811a6e83>] drop_nlink+0x43/0x50
> [ 1112.863065]  [<ffffffff813761db>] v9fs_remove+0x9b/0x100
> [ 1112.863068]  [<ffffffff8137624e>] v9fs_vfs_rmdir+0xe/0x10
> [ 1112.863071]  [<ffffffff81199c84>] vfs_rmdir+0xd4/0x130
> [ 1112.863073]  [<ffffffff8119b973>] do_rmdir+0x113/0x130
> [ 1112.863076]  [<ffffffff811ab45c>] ? mntput+0x1c/0x30
> [ 1112.863079]  [<ffffffff8118bbc1>] ? filp_close+0x61/0x90
> [ 1112.863082]  [<ffffffff8119d98d>] sys_unlinkat+0x2d/0x40
> [ 1112.863085]  [<ffffffff81aca862>] system_call_fastpath+0x16/0x1b
> [ 1112.863086] ---[ end trace d265f9f4250e3da1 ]---
>
> I get that no matter what server I use (I have tried NPFS/SPFS, diod
> and virtfs under qemu-kvm) so it seems that it is a issue with v9fs. I
> have also tried many different kernel versions (3.5.7, 3.6.3 and
> 3.7-rc2) but that didn't change anything.
>
> Here's how I trigger this behavior:
>
> mount -t 9p -o aname=/tmp/9p,version=9p2000.L 127.0.0.1 /mnt/9p
> cd /mnt/9p
> mkdir -p {1,2,3,4}/{1,2,3,4}/{1,2,3,4}/{1,2,3,4}
> rm -rf {1,2,3,4}
>
> It is the last line that causes it.
>
>
> ------------------------------------------------------------------------------
> Everyone hates slow websites. So do we.
> Make your web apps faster with AppDynamics
> Download AppDynamics Lite for free today:
> http://p.sf.net/sfu/appdyn_sfd2d_oct
> _______________________________________________
> V9fs-developer mailing list
> V9f...@li...
> https://lists.sourceforge.net/lists/listinfo/v9fs-developer
>