I have something similar in /var/log/messages:

May 14 17:45:06 ulthar kernel: [78489.312979] PGD a1358067 PUD 61f22067 PMD 0
May 14 17:45:06 ulthar kernel: [78489.312984] CPU 1
May 14 17:45:06 ulthar kernel: [78489.312986] Modules linked in: af_packet binfmt_misc rfcomm l2cap nfsd auth_rpcgss exportfs ppdev autofs4 ipv6 acpi_cpufreq cpufreq_powersave cpufreq_stats cpufreq_userspace cpufreq_ondemand cpufreq_conservative freq_table video output container dock sbs sbshc battery nfs lockd nfs_acl sunrpc iptable_filter ip_tables x_tables ext2 aes_x86_64 dm_crypt ac coretemp it87 hwmon_vid sbp2 lp loop hci_usb bluetooth snd_hda_intel snd_pcm_oss snd_mixer_oss sr_mod cdrom snd_pcm snd_page_alloc snd_hwdep nvidia(P) i2c_core snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device button snd iTCO_wdt iTCO_vendor_support shpchp parport_pc parport pci_hotplug intel_agp soundcore pcspkr evdev ext3 jbd mbcache usb_storage libusual sg usbhid hid sd_mod pata_jmicron pata_acpi ata_piix floppy ohci1394 ata_generic ieee1394 r8169 libata scsi_mod uhci_hcd ehci_hcd usbcore dm_mirror dm_snapshot dm_mod thermal processor fan fbcon tileblit font bitblit softcur
May 14 17:45:06 ulthar kernel: or fuse
May 14 17:45:06 ulthar kernel: [78489.313046] Pid: 15881, comm: mount.nfs Tainted: P        2.6.24-16-generic #1
May 14 17:45:06 ulthar kernel: [78489.313048] RIP: 0010:[graft_tree+0x4c/0x140]  [graft_tree+0x4c/0x140] graft_tree+0x4c/0x140
May 14 17:45:06 ulthar kernel: [78489.313051] RSP: 0018:ffff8100aff75c48  EFLAGS: 00010246
May 14 17:45:06 ulthar kernel: [78489.313053] RAX: ffff81005a5e3410 RBX: 00000000ffffffec RCX: 0000000000000000
May 14 17:45:06 ulthar kernel: [78489.313055] RDX: ffff810118967700 RSI: ffff8100aff75e58 RDI: ffff810118f63200
May 14 17:45:06 ulthar kernel: [78489.313057] RBP: ffff810118f63200 R08: 0000000000000000 R09: 0000000000000000
May 14 17:45:06 ulthar kernel: [78489.313059] R10: 0000000000000000 R11: ffffffff80310fb0 R12: ffff8100aff75e58
May 14 17:45:06 ulthar kernel: [78489.313060] R13: 0000000000000000 R14: 0000000000000023 R15: 0000000000000023
May 14 17:45:06 ulthar kernel: [78489.313063] FS:  00007f37fd1376e0(0000) GS:ffff81011bc01800(0000) knlGS:0000000000000000
May 14 17:45:06 ulthar kernel: [78489.313065] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
May 14 17:45:06 ulthar kernel: [78489.313066] CR2: 00000000000000b2 CR3: 000000007f805000 CR4: 00000000000006e0
May 14 17:45:06 ulthar kernel: [78489.313068] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
May 14 17:45:06 ulthar kernel: [78489.313070] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
May 14 17:45:06 ulthar kernel: [78489.313072] Process mount.nfs (pid: 15881, threadinfo ffff8100aff74000, task ffff8100ca1bc7c0)
May 14 17:45:06 ulthar kernel: [78489.313074] Stack:  ffff8100aff75e58 ffff8100aff75e60 ffff810118f63200 ffffffff802c5c42
May 14 17:45:06 ulthar kernel: [78489.313078]  0000000000200006 0000000018f63200 ffff810037970000 ffff810059dc9000
May 14 17:45:06 ulthar kernel: [78489.313082]  ffff8100ca0f4000 ffffffff802c6f2a 0000000000000400 0000000000000000
May 14 17:45:06 ulthar kernel: [78489.313085] Call Trace:
May 14 17:45:06 ulthar kernel: [78489.313090]  [nfs:do_add_mount+0xa2/0x1810] do_add_mount+0xa2/0x140
May 14 17:45:06 ulthar kernel: [78489.313095]  [do_mount+0x56a/0x810] do_mount+0x56a/0x810
May 14 17:45:06 ulthar kernel: [78489.313100]  [find_lock_page+0x3d/0xc0] find_lock_page+0x3d/0xc0
May 14 17:45:06 ulthar kernel: [78489.313106]  [nfs:filemap_fault+0x188/0x570] filemap_fault+0x188/0x390
May 14 17:45:06 ulthar kernel: [78489.313114]  [__up_read+0x21/0xb0] __up_read+0x21/0xb0
May 14 17:45:06 ulthar kernel: [78489.313118]  [search_exception_tables+0x1d/0x30] search_exception_tables+0x1d/0x30
May 14 17:45:06 ulthar kernel: [78489.313123]  [do_page_fault+0x242/0x840] do_page_fault+0x242/0x840
May 14 17:45:06 ulthar kernel: [78489.313130]  [zone_statistics+0x7d/0x80] zone_statistics+0x7d/0x80
May 14 17:45:06 ulthar kernel: [78489.313157]  [nfs:__get_free_pages+0x1b/0x12c0] __get_free_pages+0x1b/0x40
May 14 17:45:06 ulthar kernel: [78489.313164]  [sys_mount+0x9b/0x100] sys_mount+0x9b/0x100
May 14 17:45:06 ulthar kernel: [78489.313172]  [system_call+0x7e/0x83] system_call+0x7e/0x83
May 14 17:45:06 ulthar kernel: [78489.313182]
May 14 17:45:06 ulthar kernel: [78489.313183]
May 14 17:45:06 ulthar kernel: [78489.313183] Code: 0f b7 81 b2 00 00 00 25 00 f0 00 00 3d 00 40 00 00 48 8b 47
May 14 17:45:06 ulthar kernel: [78489.313195]  RSP <ffff8100aff75c48>
May 14 17:45:06 ulthar kernel: [78489.313199] ---[ end trace a0d8317e098a7a14 ]-

This is on 64-bit 8.04.