WARNING: at /build/buildd/linux-3.2.0/fs/dcache.c:1287 d_set_d_op+0x6e/0xa0()

[agenkin]

The following is displayed in dmesg. Not sure exactly what this warning is telling me.

[28867.043692] ------------[ cut here ]------------
[28867.043707] WARNING: at /build/buildd/linux-3.2.0/fs/dcache.c:1287 d_set_d_op+0x6e/0xa0()
[28867.043712] Hardware name: H8DG6/H8DGi
[28867.043715] Modules linked in: tcp_diag inet_diag autofs4 nfsd nfs lockd fscache auth_rpcgss nfs_acl binfmt_misc sunrpc sp5100_tco psmouse joydev ati_agp serio_raw mac_hid k10temp fam15h_power i2c_piix4 raid10 raid456 async_raid6_recov async_pq usbhid hid pata_atiixp raid6_pq async_xor igb xor async_memcpy dca async_tx raid1 raid0 multipath linear
[28867.043772] Pid: 23987, comm: mount.nfs Not tainted 3.2.0-25-generic-pae #40-Ubuntu
[28867.043777] Call Trace:
[28867.043788] [<c1592f2e>] ? printk+0x2d/0x2f
[28867.043798] [<c105a5e2>] warn_slowpath_common+0x72/0xa0
[28867.043805] [<c115733e>] ? d_set_d_op+0x6e/0xa0
[28867.043811] [<c115733e>] ? d_set_d_op+0x6e/0xa0
[28867.043818] [<c105a632>] warn_slowpath_null+0x22/0x30
[28867.043824] [<c115733e>] d_set_d_op+0x6e/0xa0
[28867.043850] [<f86c260c>] __rpc_lookup_create+0x4c/0x80 [sunrpc]
[28867.043872] [<f86c32f0>] rpc_mkpipe+0x90/0x1d0 [sunrpc]
[28867.043881] [<c10fde97>] ? __get_free_pages+0x27/0x30
[28867.043889] [<c1133037>] ? kmalloc_order_trace+0x27/0xa0
[28867.043918] [<f87a30af>] nfs_idmap_new+0x5f/0xe0 [nfs]
[28867.043934] [<f87773b1>] nfs4_init_client+0x81/0x180 [nfs]
[28867.043950] [<f8775fad>] nfs_get_client+0x15d/0x230 [nfs]
[28867.043967] [<f87760d8>] nfs4_set_client.isra.19+0x58/0xc0 [nfs]
[28867.043983] [<f87765da>] nfs4_init_server+0xba/0x250 [nfs]
[28867.044003] [<f86b4bba>] ? __rpc_init_priority_wait_queue+0x6a/0x80 [sunrpc]
[28867.044069] [<f86b4b01>] ? __rpc_add_timer+0x71/0xa0 [sunrpc]
[28867.044086] [<f87774e7>] nfs4_create_server+0x37/0xe0 [nfs]
[28867.044104] [<f87811df>] nfs4_remote_mount+0x3f/0x2b0 [nfs]
[28867.044117] [<c1147cc6>] mount_fs+0x36/0x180
[28867.044129] [<c11124ff>] ? __alloc_percpu+0xf/0x20
[28867.044136] [<c115e9de>] ? alloc_vfsmnt+0xae/0x130
[28867.044142] [<c115eaf1>] vfs_kern_mount+0x51/0xa0
[28867.044160] [<f878152c>] nfs_do_root_mount+0x7c/0xc0 [nfs]
[28867.044191] [<f8781dc8>] nfs4_try_mount.isra.15+0x48/0xe0 [nfs]
[28867.044221] [<f8782d09>] nfs_fs_mount+0x189/0x1e0 [nfs]
[28867.044238] [<c1147cc6>] mount_fs+0x36/0x180
[28867.044256] [<c11124ff>] ? __alloc_percpu+0xf/0x20
[28867.044274] [<c115e9de>] ? alloc_vfsmnt+0xae/0x130
[28867.044293] [<c115eaf1>] vfs_kern_mount+0x51/0xa0
[28867.044309] [<c115fc1e>] do_kern_mount+0x3e/0xe0
[28867.044328] [<c1161314>] do_mount+0x164/0x200
[28867.044346] [<c116174b>] sys_mount+0x6b/0xa0
[28867.044366] [<c15afedf>] sysenter_do_call+0x12/0x28
[28867.044378] ---[ end trace ca0af56ffc0cfd30 ]---
[28867.044389] ------------[ cut here ]------------
[28867.044402] WARNING: at /build/buildd/linux-3.2.0/fs/dcache.c:1291 d_set_d_op+0x8f/0xa0()
[28867.044414] Hardware name: H8DG6/H8DGi
[28867.044424] Modules linked in: tcp_diag inet_diag autofs4 nfsd nfs lockd fscache auth_rpcgss nfs_acl binfmt_misc sunrpc sp5100_tco psmouse joydev ati_agp serio_raw mac_hid k10temp fam15h_power i2c_piix4 raid10 raid456 async_raid6_recov async_pq usbhid hid pata_atiixp raid6_pq async_xor igb xor async_memcpy dca async_tx raid1 raid0 multipath linear
[28867.044722] Pid: 23987, comm: mount.nfs Tainted: G W 3.2.0-25-generic-pae #40-Ubuntu
[28867.044733] Call Trace:
[28867.044752] [<c1592f2e>] ? printk+0x2d/0x2f
[28867.044774] [<c105a5e2>] warn_slowpath_common+0x72/0xa0
[28867.044792] [<c115735f>] ? d_set_d_op+0x8f/0xa0
[28867.044807] [<c115735f>] ? d_set_d_op+0x8f/0xa0
[28867.044826] [<c105a632>] warn_slowpath_null+0x22/0x30
[28867.044842] [<c115735f>] d_set_d_op+0x8f/0xa0
[28867.044873] [<f86c260c>] __rpc_lookup_create+0x4c/0x80 [sunrpc]
[28867.044905] [<f86c32f0>] rpc_mkpipe+0x90/0x1d0 [sunrpc]
[28867.044924] [<c10fde97>] ? __get_free_pages+0x27/0x30
[28867.044943] [<c1133037>] ? kmalloc_order_trace+0x27/0xa0
[28867.044979] [<f87a30af>] nfs_idmap_new+0x5f/0xe0 [nfs]
[28867.045006] [<f87773b1>] nfs4_init_client+0x81/0x180 [nfs]
[28867.045034] [<f8775fad>] nfs_get_client+0x15d/0x230 [nfs]
[28867.045062] [<f87760d8>] nfs4_set_client.isra.19+0x58/0xc0 [nfs]
[28867.045090] [<f87765da>] nfs4_init_server+0xba/0x250 [nfs]
[28867.045121] [<f86b4bba>] ? __rpc_init_priority_wait_queue+0x6a/0x80 [sunrpc]
[28867.045152] [<f86b4b01>] ? __rpc_add_timer+0x71/0xa0 [sunrpc]
[28867.045182] [<f87774e7>] nfs4_create_server+0x37/0xe0 [nfs]
[28867.045213] [<f87811df>] nfs4_remote_mount+0x3f/0x2b0 [nfs]
[28867.045232] [<c1147cc6>] mount_fs+0x36/0x180
[28867.045247] [<c11124ff>] ? __alloc_percpu+0xf/0x20
[28867.045265] [<c115e9de>] ? alloc_vfsmnt+0xae/0x130
[28867.045282] [<c115eaf1>] vfs_kern_mount+0x51/0xa0
[28867.045314] [<f878152c>] nfs_do_root_mount+0x7c/0xc0 [nfs]
[28867.045345] [<f8781dc8>] nfs4_try_mount.isra.15+0x48/0xe0 [nfs]
[28867.045376] [<f8782d09>] nfs_fs_mount+0x189/0x1e0 [nfs]
[28867.045396] [<c1147cc6>] mount_fs+0x36/0x180
[28867.045411] [<c11124ff>] ? __alloc_percpu+0xf/0x20
[28867.045427] [<c115e9de>] ? alloc_vfsmnt+0xae/0x130
[28867.045445] [<c115eaf1>] vfs_kern_mount+0x51/0xa0
[28867.045464] [<c115fc1e>] do_kern_mount+0x3e/0xe0
[28867.045483] [<c1161314>] do_mount+0x164/0x200
[28867.045500] [<c116174b>] sys_mount+0x6b/0xa0
[28867.045517] [<c15afedf>] sysenter_do_call+0x12/0x28
[28867.045528] ---[ end trace ca0af56ffc0cfd31 ]---

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-25-generic-pae 3.2.0-25.40
ProcVersionSignature: Ubuntu 3.2.0-25.40-generic-pae 3.2.18
Uname: Linux 3.2.0-25-generic-pae i686
AlsaDevices:
 total 0
 crw-rw---T 1 root audio 116, 1 Jun 18 15:29 seq
 crw-rw---T 1 root audio 116, 33 Jun 18 15:29 timer
AplayDevices: aplay: device_list:252: no soundcards found...
ApportVersion: 2.0.1-0ubuntu8
Architecture: i386
ArecordDevices: arecord: device_list:252: no soundcards found...
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Date: Tue Jun 19 15:17:41 2012
IwConfig: Error: [Errno 2] No such file or directory
MachineType: Supermicro H8DG6/H8DGi
PciMultimedia:

ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 SHELL=/bin/bash
ProcFB:

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-25-generic-pae root=/dev/md0p1 ro
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-3.2.0-25-generic-pae N/A
 linux-backports-modules-3.2.0-25-generic-pae N/A
 linux-firmware 1.79
RfKill: Error: [Errno 2] No such file or directory
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
WifiSyslog:

dmi.bios.date: 11/10/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2.0a
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: H8DG6/H8DGi
dmi.board.vendor: Supermicro
dmi.board.version: 1.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 17
dmi.chassis.vendor: Supermicro
dmi.chassis.version: 1234567890
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2.0a:bd11/10/2011:svnSupermicro:pnH8DG6/H8DGi:pvr1234567890:rvnSupermicro:rnH8DG6/H8DGi:rvr1.0:cvnSupermicro:ct17:cvr1234567890:
dmi.product.name: H8DG6/H8DGi
dmi.product.version: 1234567890
dmi.sys.vendor: Supermicro

[agenkin (agenkin-p)]

Possibly the same bug in Fedora:
https://bugzilla.redhat.com/show_bug.cgi?id=814938

[Joseph Salisbury (jsalisbury)]

Do you know if this issue happened in a previous version of Ubuntu, or is this a new issue?

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.5kernel[0] (Not a kernel in the daily directory) and install both the linux-image and linux-image-extra .deb packages.

Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag(Only that one tag, please leave the other tags). This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text.

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] hwttp://kernel.ubuntu.com/~kernel-ppa/mainline/v3.5-rc3-quantal/