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  1. [1280611.224006] BUG: unable to handle kernel NULL pointer dereference at 00000020
  2. [1280611.224067] IP: [<f83a9b9e>] nfs_lookup_revalidate+0xe/0x480 [nfs]
  3. [1280611.224219] *pde = 39805067
  4. [1280611.224245] Oops: 0000 [#1] SMP
  5. [1280611.224272] Modules linked in: ftdi_sio usbserial sit tunnel4 ip6_queue nf_conntrack_proto_udplite xt_sctp ip6t_LOG ip6t_REJECT nf_conntrack_ipv6 ip6table_raw ip6table_mangle ip6table_filter act_police cls_flow cls_fw cls_u32 sch_tbf sch_prio sch_htb sch_hfsc sch_ingress sch_sfq xt_time xt_connlimit xt_realm xt_addrtype iptable_raw xt_comment xt_recent xt_policy ipt_ULOG ipt_REJECT ipt_REDIRECT ipt_NETMAP ipt_MASQUERADE ipt_ECN ipt_ecn ipt_CLUSTERIP ipt_ah xt_set ip_set nf_nat_tftp nf_nat_snmp_basic nf_conntrack_snmp nf_nat_sip nf_nat_pptp nf_nat_proto_gre nf_nat_irc nf_nat_h323 nf_nat_ftp nf_nat_amanda ts_kmp nf_conntrack_amanda nf_conntrack_sane nf_conntrack_tftp nf_conntrack_sip nf_conntrack_proto_sctp nf_conntrack_pptp nf_conntrack_proto_gre nf_conntrack_netlink nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_irc nf_conntrack_h323 nf_conntrack_ftp xt_TPROXY nf_tproxy_core ip6_tables nf_defrag_ipv6 xt_pkttype xt_physdev xt_owner xt_NFQUEUE xt_NFLOG nfnetlink_log xt_multiport xt_mark xt_mac xt_limit xt_length xt_iprange xt_helper xt_hashlimit xt_DSCP xt_dscp xt_dccp xt_conntrack xt_connmark xt_CLASSIFY xt_AUDIT ipt_LOG xt_state iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack nfnetlink iptable_filter xt_TCPMSS xt_tcpmss xt_tcpudp iptable_mangle ip_tables x_tables pppoe pppox dm_crypt ppdev snd_via82xx gameport snd_ac97_codec ac97_bus snd_pcm snd_page_alloc snd_mpu401_uart bridge snd_seq_midi stp dm_multipath snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device serio_raw cdc_acm snd i2c_viapro soundcore nfsd nfs parport_pc lockd shpchp fscache auth_rpcgss nfs_acl binfmt_misc sunrpc f71805f padlock_sha padlock_aes lp parport raid10 raid456 async_raid6_recov async_pq raid6_pq async_xor xor async_memcpy async_tx raid0 multipath linear firewire_sbp2 raid1 firewire_ohci usb_storage uas via_rhine e1000 firewire_core sata_via pata_via crc_itu_t floppy [last unloaded: ftdi_sio]
  6. [1280611.225377]
  7. [1280611.225398] Pid: 32475, comm: ls Not tainted 3.0.0-16-generic #28-Ubuntu /CN700-8237
  8. [1280611.225449] EIP: 0060:[<f83a9b9e>] EFLAGS: 00010282 CPU: 0
  9. [1280611.225552] EIP is at nfs_lookup_revalidate+0xe/0x480 [nfs]
  10. [1280611.225582] EAX: f6cfa300 EBX: f6cfa300 ECX: f83d6300 EDX: 00000000
  11. [1280611.225613] ESI: cecf9d90 EDI: f56dc680 EBP: cecf9d64 ESP: cecf9d34
  12. [1280611.225644] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
  13. [1280611.225674] Process ls (pid: 32475, ti=cecf8000 task=f694d940 task.ti=cecf8000)
  14. [1280611.225712] Stack:
  15. [1280611.225729] f6cfa824 00000007 cecf9d90 f56dc680 00e1c0fc f56dc680 cecf9d90 cecf9d64
  16. [1280611.225791] c113e3f1 f6cfa300 cecf9d90 f56dc680 cecf9d80 c1132e7a f82e6b6d 00000000
  17. [1280611.225851] 00000000 f56dc680 e9a72b94 cecf9da8 c1132fb4 00000000 cecf9dc4 1b420316
  18. [1280611.225911] Call Trace:
  19. [1280611.225947] [<c113e3f1>] ? d_lookup+0x31/0x60
  20. [1280611.226732] [<c1132e7a>] __lookup_hash.part.13+0x4a/0x90
  21. [1280611.226893] [<f82e6b6d>] ? put_rpccred+0x2d/0x50 [sunrpc]
  22. [1280611.226928] [<c1132fb4>] lookup_one_len+0xf4/0x180
  23. [1280611.226964] [<c11f9330>] ecryptfs_lookup+0x50/0x1b0
  24. [1280611.226995] [<c1132527>] d_alloc_and_lookup+0x37/0x70
  25. [1280611.227027] [<c1134a53>] do_lookup+0x1e3/0x270
  26. [1280611.227057] [<c1135f36>] path_lookupat+0x106/0x650
  27. [1280611.227090] [<c1118d0d>] ? kmem_cache_alloc+0x11d/0x140
  28. [1280611.227228] [<f83a8f79>] ? cache_page_release.isra.28+0x19/0x40 [nfs]
  29. [1280611.227272] [<c1289958>] ? strncpy_from_user+0x38/0x70
  30. [1280611.227304] [<c11364ac>] do_path_lookup+0x2c/0xb0
  31. [1280611.227334] [<c1136c86>] user_path_at_empty+0x46/0x80
  32. [1280611.227368] [<c10ffa9c>] ? handle_pte_fault+0xec/0x220
  33. [1280611.227400] [<c10ffcd8>] ? handle_mm_fault+0x108/0x210
  34. [1280611.227431] [<c1136cdf>] user_path_at+0x1f/0x30
  35. [1280611.227460] [<c112d613>] vfs_fstatat+0x53/0x80
  36. [1280611.227488] [<c112d660>] vfs_lstat+0x20/0x30
  37. [1280611.227517] [<c112d936>] sys_lstat64+0x16/0x30
  38. [1280611.227546] [<c1139734>] ? vfs_readdir+0x84/0xd0
  39. [1280611.227574] [<c1139430>] ? sys_ioctl+0x80/0x80
  40. [1280611.227602] [<c113993e>] ? sys_getdents64+0x9e/0xc0
  41. [1280611.227613] [<c1531bc0>] ? vmalloc_fault+0xee/0xee
  42. [1280611.227613] [<c152eaa4>] syscall_call+0x7/0xb
  43. [1280611.227613] Code: 47 10 05 5c 01 00 00 89 44 24 04 e8 ee 13 17 c9 e9 2d ff ff ff 90 8d b4 26 00 00 00 00 55 89 e5 57 56 53 83 ec 24 3e 8d 74 26 00 <f6> 42 20 40 89 45 f0 89 d6 b8 f6 ff ff ff 0f 85 ce 00 00 00 8b
  44. [1280611.227613] EIP: [<f83a9b9e>] nfs_lookup_revalidate+0xe/0x480 [nfs] SS:ESP 0068:cecf9d34
  45. [1280611.227613] CR2: 0000000000000020
  46. [1280611.228528] ---[ end trace 6303cbd96513faca ]---
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