[ 71.450371] FS-Cache: Loaded [ 71.504142] FS-Cache: Netfs 'nfs' registered for caching [ 71.553022] nfs4filelayout_init: NFSv4 File Layout Driver Registering... [ 110.788743] BUG: unable to handle kernel NULL pointer dereference at 0000000000000040 [ 110.788749] IP: [] filelayout_get_stripesize+0x26/0x40 [nfs_layout_nfsv41_files] [ 110.788760] PGD 32b54067 PUD 2321a067 PMD 0 [ 110.788764] Oops: 0000 [#1] SMP [ 110.788766] last sysfs file: /sys/block/sda/sda1/stat [ 110.788769] CPU 0 [ 110.788770] Modules linked in: nfs_layout_nfsv41_files nfs lockd fscache nfs_acl auth_rpcgss sunrpc ipv6 af_packet binfmt_misc dm_mirror dm_multipath scsi_dh video output sbs sbshc pci_slot fan container battery lp ac sg option usb_wwan usbserial thermal thermal_sys button parport_pc serio_raw parport tpm_tis tpm tpm_bios i2c_piix4 e1000 pata_mpiix dm_region_hash dm_log dm_mod [last unloaded: mperf] [ 110.788794] [ 110.788797] Pid: 2162, comm: ls Not tainted 2.6.36-rc6.pnfs.1 #1 /VirtualBox [ 110.788799] RIP: 0010:[] [] filelayout_get_stripesize+0x26/0x40 [nfs_layout_nfsv41_files] [ 110.788804] RSP: 0018:ffff880023219cc8 EFLAGS: 00010296 [ 110.788807] RAX: 0000000000000000 RBX: ffffffffa006fa00 RCX: 7fffffffffffffff [ 110.788809] RDX: 0000000000002726 RSI: ffff880023219cc8 RDI: ffff88003ec892c0 [ 110.788811] RBP: ffff880022851330 R08: 0000000000000000 R09: ffff880022851448 [ 110.788813] R10: 0000000000000001 R11: ffffffffa0228570 R12: ffff8800228513dc [ 110.788815] R13: ffff880023219d50 R14: ffff880022851448 R15: ffff880022851150 [ 110.788823] FS: 00007f9387c5a710(0000) GS:ffff880001800000(0000) knlGS:0000000000000000 [ 110.788826] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 110.788828] CR2: 0000000000000040 CR3: 0000000026f2e000 CR4: 00000000000006f0 [ 110.788834] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 110.788837] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 110.788840] Process ls (pid: 2162, threadinfo ffff880023218000, task ffff880028372e30) [ 110.788841] Stack: [ 110.788842] ffff880000000001 0000000000000000 ffffffffffffffff ffffffff810d7864 [ 110.788845] <0> ffffffffa006fa00 ffffffffa024a28e ffff880023219d78 ffff880022851330 [ 110.788849] <0> ffff88002316a400 ffffffffa024b638 ffff880022851330 ffff880022851330 [ 110.788853] Call Trace: [ 110.788858] [] ? do_lookup+0xb4/0x170 [ 110.788882] [] ? pnfs_getboundary+0x6e/0x80 [nfs] [ 110.788892] [] ? pnfs_pageio_init_write+0x78/0xa0 [nfs] [ 110.788901] [] ? nfs_pageio_init_write+0x3f/0x90 [nfs] [ 110.788909] [] ? nfs_writepages+0x80/0x130 [nfs] [ 110.788913] [] ? path_walk+0x6a/0xd0 [ 110.788917] [] ? __filemap_fdatawrite_range+0x54/0x60 [ 110.788920] [] ? filemap_write_and_wait+0x35/0x50 [ 110.788928] [] ? nfs_getattr+0xf4/0x100 [nfs] [ 110.788932] [] ? vfs_fstatat+0x6a/0x80 [ 110.788935] [] ? sys_newlstat+0x1f/0x50 [ 110.788938] [] ? system_call_fastpath+0x16/0x1b [ 110.788940] Code: 80 00 00 00 00 53 48 83 ec 20 48 89 e6 c7 04 24 01 00 00 00 48 c7 44 24 08 00 00 00 00 48 c7 44 24 10 ff ff ff ff e8 9a d2 1d 00 <8b> 58 40 48 89 c7 e8 0f d6 1d 00 48 83 c4 20 48 89 d8 5b c3 66 [ 110.788965] RIP [] filelayout_get_stripesize+0x26/0x40 [nfs_layout_nfsv41_files] [ 110.788969] RSP [ 110.788971] CR2: 0000000000000040 [ 110.788973] ---[ end trace f509369417b82255 ]---