[Regression][Trusty][3.13.0-37] LP:1376245: Please revert the patch 79605e758aab

[Stefan Bader]

On 18.10.2014 07:03, Pranith Kumar wrote:
> Hello,
> 
> As mentioned in this bug report:
> 
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1376245
> 
> I recently started to see this WARNING on my desktop machine.
> 
> [211141.506974] WARNING: CPU: 0 PID: 7776 at fs/proc/generic.c:511
> remove_proc_entry+0x125/0x180()
> [211141.506974] name 'fs/nfsfs'
> [211141.506974] Modules linked in: pci_stub vboxpci(O) vboxnetadp(O)
> vboxnetflt(O) vboxdrv(O) nvidia(PO) mxm_wmi joydev ghash_clmulni_intel
> aesni_intel aes_x86_64 glue_helper lrw gf128mul ablk_helper cryptd
> lpc_ich serio_raw mfd_core parport_pc parport wmi  firewire_ohci
> firewire_core crc_itu_t e1000e
> [211141.506980] CPU: 0 PID: 7776 Comm: kworker/u16:1 Tainted: P
> W  O 3.13.11.8+ #7
> [211141.506981] Hardware name:                  /DZ77GA-70K, BIOS
> GAZ7711H.86A.0059.2012.1106.1053 11/06/2012
> [211141.506982] Workqueue: netns cleanup_net
> [211141.506982]  0000000000000009 ffff8800cfdebc98 ffffffff817ca2ae
> ffff8800cfdebce0
> [211141.506983]  ffff8800cfdebcd0 ffffffff81045628 0000000000000000
> 0000000000000005
> [211141.506984]  ffffffff819c26b4 ffffffff819c26b7 ffff88040e0059b0
> ffff8800cfdebd30
> [211141.506985] Call Trace:
> [211141.506986]  [<ffffffff817ca2ae>] dump_stack+0x45/0x56
> [211141.506988]  [<ffffffff81045628>] warn_slowpath_common+0x78/0xa0
> [211141.506989]  [<ffffffff81045697>] warn_slowpath_fmt+0x47/0x50
> [211141.506990]  [<ffffffff811ba315>] remove_proc_entry+0x125/0x180
> [211141.506991]  [<ffffffff81233e3d>] nfs_fs_proc_net_exit+0x5d/0x70
> [211141.506992]  [<ffffffff812392fd>] nfs_net_exit+0xd/0x20
> [211141.506993]  [<ffffffff8161dda9>] ops_exit_list.isra.3+0x39/0x60
> [211141.506994]  [<ffffffff8161e600>] cleanup_net+0x100/0x1b0
> [211141.506996]  [<ffffffff8105f7cd>] process_one_work+0x16d/0x450
> [211141.506997]  [<ffffffff8106045d>] worker_thread+0x12d/0x3d0
> [211141.506998]  [<ffffffff81060330>] ? manage_workers.isra.25+0x2c0/0x2c0
> [211141.507000]  [<ffffffff810662a6>] kthread+0xd6/0xf0
> [211141.507001]  [<ffffffff810661d0>] ? kthread_create_on_node+0x180/0x180
> [211141.507002]  [<ffffffff817da6bc>] ret_from_fork+0x7c/0xb0
> [211141.507003]  [<ffffffff810661d0>] ? kthread_create_on_node+0x180/0x180
> [211141.507004] ---[ end trace f415ec98bcbf9058 ]---
> [265425.656507] ------------[ cut here ]------------
> 
> 
> As mentioned in the bug report, it is due to
> 79605e758aab5d9deba094acaa3a91d74787562f. I reverted this commit and
> found that the warning disappears.
> 
> Please revert.
> 
> Thanks!
> 
There was a recent follow-up patch that claims to address the issues you see. It
is proposed for stable but had not enough time to get picked up. You could try
to verify this indeed helps by undoing the revert and adding

commit 2f3169fb18f4643ac9a6a097a6a6c71f0b2cef75
Author: Fabian Frederick <fabf at skynet.be>
Date:   Wed Sep 24 18:56:11 2014 +0200

    nfs: fix duplicate proc entries

from Linus git tree on top instead.

-Stefan

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