[73885.332937] afs: byte-range locks only enforced for processes on this machine (pid 311 (procmail), user 538053610, fid 538053610.13012.1893016).
[75717.446555] BUG: unable to handle kernel NULL pointer dereference at 0000000000000004
[75717.448340] IP: [<ffffffffa018fb06>] afs_linux_dentry_revalidate+0x2f6/0x520 [openafs]
[75717.449957] PGD a2135067 PUD 99286067 PMD 0 
[75717.451527] Oops: 0000 [#1] SMP 
[75717.453052] Modules linked in: lockd sunrpc coretemp crct10dif_pclmul crc32_pclmul crc32c_intel vmw_balloon ppdev vmxnet3 ghash_clmulni_intel serio_raw i2c_piix4 shpchp vmw_vmci parport_pc parport openafs(POE) vmw_pvscsi vmwgfx drm_kms_helper ttm drm ata_generic pata_acpi ip6table_filter ip6_tables xt_owner xt_LOG fuse binfmt_misc
[75717.457718] CPU: 2 PID: 25011 Comm: python Tainted: P           OE  3.17.3-200.fc20.x86_64 #1
[75717.459243] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/30/2013
[75717.460763] task: ffff88021c5cd850 ti: ffff8801f9170000 task.ti: ffff8801f9170000
[75717.462255] RIP: 0010:[<ffffffffa018fb06>]  [<ffffffffa018fb06>] afs_linux_dentry_revalidate+0x2f6/0x520 [openafs]
[75717.463761] RSP: 0018:ffff8801f9173ba0  EFLAGS: 00010246
[75717.465220] RAX: 0000000000000000 RBX: ffff88027e320900 RCX: 0000000000000001
[75717.466669] RDX: 0000000822152215 RSI: 0000000000000007 RDI: ffff8800a83e9658
[75717.468086] RBP: ffff8801f9173c00 R08: 696d2f6d2f67726f R09: 8080808080808080
[75717.469487] R10: fefefefefefefeff R11: ffff88027e320900 R12: ffff88027e393400
[75717.470877] R13: ffff8800a83e9600 R14: ffff88027e1ac800 R15: ffff8802b07617e0
[75717.472247] FS:  00007f50635e0700(0000) GS:ffff8802bfc80000(0000) knlGS:0000000000000000
[75717.473620] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[75717.474948] CR2: 0000000000000004 CR3: 000000007e26e000 CR4: 00000000000007e0
[75717.476313] Stack:
[75717.477590]  ffff8801f9173bf8 ffff88027e393400 0000000000000000 0000000000000000
[75717.478877]  0000000000000001 ffff88006fa69034 0000000021222284 ffff8801f9173dc0
[75717.480143]  ffff88027e320900 ffff8801f9173c98 ffff8801f9173c88 ffff8802b07617e0
[75717.481390] Call Trace:
[75717.482590]  [<ffffffff8120c1ed>] lookup_fast+0x26d/0x2f0
[75717.483771]  [<ffffffff812ff27c>] ? security_inode_permission+0x1c/0x30
[75717.484920]  [<ffffffff8120d327>] link_path_walk+0x1a7/0x880
[75717.486036]  [<ffffffff8120da6b>] path_lookupat+0x6b/0x790
[75717.487130]  [<ffffffff811e48c5>] ? kmem_cache_alloc+0x35/0x1f0
[75717.488190]  [<ffffffff8120ca0f>] ? getname_flags+0x4f/0x1a0
[75717.489226]  [<ffffffff8120e1bb>] filename_lookup+0x2b/0xc0
[75717.490236]  [<ffffffff81212417>] user_path_at_empty+0x67/0xc0
[75717.491209]  [<ffffffff811269f2>] ? from_kgid_munged+0x12/0x20
[75717.492155]  [<ffffffff81206d0f>] ? cp_new_stat+0x14f/0x180
[75717.493069]  [<ffffffff81212481>] user_path_at+0x11/0x20
[75717.493982]  [<ffffffff81206803>] vfs_fstatat+0x63/0xc0
[75717.494847]  [<ffffffff81206d6e>] SYSC_newstat+0x2e/0x60
[75717.495698]  [<ffffffff81131436>] ? __audit_syscall_exit+0x1f6/0x2a0
[75717.496584]  [<ffffffff8120703e>] SyS_newstat+0xe/0x10
[75717.497424]  [<ffffffff817301a9>] system_call_fastpath+0x16/0x1b
[75717.498256] Code: 80 00 00 00 00 48 89 df 48 c7 45 b8 00 00 00 00 e8 70 8a 08 e1 4c 8b 70 30 49 89 c5 49 8b 84 24 28 03 00 00 41 8b 8e a4 02 00 00 <39> 48 04 0f 84 af 00 00 00 e8 1c f5 f9 ff 48 8b 73 28 48 8d 55 
[75717.500021] RIP  [<ffffffffa018fb06>] afs_linux_dentry_revalidate+0x2f6/0x520 [openafs]
[75717.500924]  RSP <ffff8801f9173ba0>
[75717.501794] CR2: 0000000000000004
[75717.504579] ---[ end trace a6c42d7f95ecf668 ]---