I've seen this on a brand new edgy installation with the /home drive mounted over nfs using nfs-user-server on kernels 2.6.17-10-386, 2.6.17-10-server and 2.6.17-10-generic.
Whenever load is put on nfs by starting e.g. openoffice and firefox, then after a few seconds I see the kernel messages below and one or more of the programs accessing the home drive freeze up. Can't use the kernel-nfs as it causes other problems with gnome panels freezing!! I haven't found a fix yet. Dapper workstations on the same network work without problems. For information here is my kernel messages:- Nov 11 20:16:33 os-i03 kernel: [42949573.900000] BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000 Nov 11 20:16:33 os-i03 kernel: [42949573.900000] printing eip: Nov 11 20:16:33 os-i03 kernel: [42949573.900000] c0119a92 Nov 11 20:16:33 os-i03 kernel: [42949573.900000] *pde = 07acb001 Nov 11 20:16:33 os-i03 kernel: [42949573.900000] Oops: 0000 [#1] Nov 11 20:16:33 os-i03 kernel: [42949573.900000] SMP Nov 11 20:16:33 os-i03 kernel: [42949573.900000] Modules linked in: binfmt_misc rfcomm l2cap bluetooth mga drm speedstep_lib cpufreq_userspace cpufreq_stats freq_table cpufreq_powersave cpufreq_ondemand cpufreq_conservative video tc1100_wmi sbs sony_acpi pcc_acpi i2c_ec i2c_core hotkey dev_acpi button battery container ac asus_acpi ipv6 nfs lockd sunrpc af_packet lp snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_pcm_oss sg snd_pcm e100 snd_mixer_oss snd_seq_dummy snd_seq_oss matrox_w1 wire snd_seq_midi snd_rawmidi snd_seq_midi_event mii tsdev snd_seq snd_timer snd_seq_device serio_raw snd soundcore snd_page_alloc intel_agp agpgart hw_random shpchp pci_hotplug psmouse evdev parport_pc parport floppy pcspkr ext3 jbd sd_mod uhci_hcd usbcore ide_generic aic7xxx scsi_transport_spi scsi_mod ide_cd cdrom piix generic thermal processor fan fbcon tileblit font bitblit softcursor vesafb capability commoncap Nov 11 20:16:33 os-i03 kernel: [42949573.900000] CPU: 0 Nov 11 20:16:33 os-i03 kernel: [42949573.900000] EIP: 0060:[kmap_atomic+34/224] Not tainted VLI Nov 11 20:16:33 os-i03 kernel: [42949573.900000] EFLAGS: 00210202 (2.6.17-10-server #2) Nov 11 20:16:33 os-i03 kernel: [42949573.900000] EIP is at kmap_atomic+0x22/0xe0 Nov 11 20:16:33 os-i03 kernel: [42949573.900000] eax: 00000000 ebx: 00000000 ecx: cd5da000 edx: 00000003 Nov 11 20:16:33 os-i03 kernel: [42949573.900000] esi: 00000003 edi: 0000036e ebp: cf765ba4 esp: cd5dbd6c Nov 11 20:16:33 os-i03 kernel: [42949573.900000] ds: 007b es: 007b ss: 0068 Nov 11 20:16:33 os-i03 kernel: [42949573.900000] Process firefox-bin (pid: 5071, threadinfo=cd5da000 task=d25b7560) Nov 11 20:16:33 os-i03 kernel: [42949573.900000] Stack: 00000003 cf765b4c 00000649 00000c92 0000036e cf765ba4 e0bafc78 000009b7 Nov 11 20:16:33 os-i03 kernel: [42949573.900000] c064bc80 00001000 cf765ba4 e0bb0c12 00000004 00200206 00200286 00200096 Nov 11 20:16:33 os-i03 kernel: [42949573.900000] 00200082 cf765c50 00000000 c01e12f0 00000001 c01e1b8a 00000000 00000000 Nov 11 20:16:33 os-i03 kernel: [42949573.900000] Call Trace: Nov 11 20:16:33 os-i03 kernel: [42949573.900000] <e0bafc78> nfs_readpage_truncate_uninitialised_page+0xe8/0x130 [nfs] <e0bb0c12> nfs_readpage+0x272/0x4f0 [nfs] Nov 11 20:16:33 os-i03 kernel: [42949573.900000] <c01e12f0> radix_tree_node_alloc+0x10/0x60 <c01e1b8a> radix_tree_insert+0x1ca/0x210 Nov 11 20:16:33 os-i03 kernel: [42949573.900000] <c014b305> do_generic_mapping_read+0x4e5/0x570 <c014bd58> __generic_file_aio_read+0xf8/0x270 Nov 11 20:16:33 os-i03 kernel: [42949573.900000] <c014a530> file_read_actor+0x0/0xf0 <e0baa14e> nfs_revalidate_mapping+0x9e/0x160 [nfs] Nov 11 20:16:33 os-i03 kernel: [42949573.900000] <c014bf15> generic_file_aio_read+0x45/0x60 <c0169e34> do_sync_read+0xc4/0x100 Nov 11 20:16:33 os-i03 kernel: [42949573.900000] <c0135020> autoremove_wake_function+0x0/0x50 <c01740de> sys_fstat64+0x1e/0x30 Nov 11 20:16:33 os-i03 kernel: [42949573.900000] <c016ac11> remote_llseek+0x41/0xf0 <c016a8cc> vfs_read+0xbc/0x180 Nov 11 20:16:33 os-i03 kernel: [42949573.900000] <c0169d70> do_sync_read+0x0/0x100 <c016ae41> sys_read+0x41/0x70 Nov 11 20:16:33 os-i03 kernel: [42949573.900000] <c0102f8b> sysenter_past_esp+0x54/0x75 Nov 11 20:16:33 os-i03 kernel: [42949573.900000] Code: 90 90 90 90 90 90 90 90 90 83 ec 18 b9 00 e0 ff ff 89 5c 24 08 89 c3 89 74 24 0c 89 d6 89 7c 24 10 89 6c 24 14 21 e1 83 41 14 01 <8b> 00 c1 e8 1e 8b 14 85 04 71 3e c0 8b 82 0c 06 00 00 05 80 13 Nov 11 20:16:33 os-i03 kernel: [42949573.900000] EIP: [kmap_atomic+34/224] kmap_atomic+0x22/0xe0 SS:ESP 0068:cd5dbd6c Nov 11 20:16:33 os-i03 kernel: [42949573.900000] <6>note: firefox-bin[5071] exited with preempt_count 1 -- Oops in NFS code https://launchpad.net/bugs/66876 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
