[227042.131536] afs: byte-range locks only enforced for processes on this machine (pid 32550 (procmail), user 537110616, fid 537110616.2944.11346).
[227170.435578] BUG: unable to handle kernel NULL pointer dereference at 0000000000000004
[227170.436323] IP: [<ffffffffa018bb06>] afs_linux_dentry_revalidate+0x2f6/0x520 [openafs]
[227170.437032] PGD 29506d067 PUD 29afd0067 PMD 0 
[227170.437680] Oops: 0000 [#1] SMP 
[227170.438326] Modules linked in: lockd sunrpc coretemp crct10dif_pclmul crc32_pclmul ppdev vmw_balloon crc32c_intel vmxnet3 serio_raw ghash_clmulni_intel shpchp parport_pc i2c_piix4 vmw_vmci 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
[227170.440284] CPU: 4 PID: 26308 Comm: python Tainted: P           OE  3.17.3-200.fc20.x86_64 #1
[227170.440923] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/30/2013
[227170.441553] task: ffff880032d4b110 ti: ffff8802003d4000 task.ti: ffff8802003d4000
[227170.442196] RIP: 0010:[<ffffffffa018bb06>]  [<ffffffffa018bb06>] afs_linux_dentry_revalidate+0x2f6/0x520 [openafs]
[227170.442868] RSP: 0018:ffff8802003d7b10  EFLAGS: 00010246
[227170.443531] RAX: 0000000000000000 RBX: ffff88028049c6c0 RCX: 0000000000000001
[227170.444218] RDX: 0000000adedddedd RSI: 0000000000000009 RDI: ffff8800a9ad0dd8
[227170.444907] RBP: ffff8802003d7b70 R08: 7974697669746361 R09: 8080808080808080
[227170.445607] R10: fefefefefefefeff R11: ffff88028049c6c0 R12: ffff880280405c00
[227170.446317] R13: ffff8800a9ad0d80 R14: ffff8800a9b00400 R15: ffff88029d5147a0
[227170.447039] FS:  00007ffc1a0ce700(0000) GS:ffff8802bfd00000(0000) knlGS:0000000000000000
[227170.447774] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[227170.448514] CR2: 0000000000000004 CR3: 00000001041c5000 CR4: 00000000000007e0
[227170.449307] Stack:
[227170.450070]  ffff8802003d7b68 ffff880280405c00 0000000000000000 0000000000000000
[227170.450855]  ffff880200000001 ffff88020ad2e494 000000002f7df76c ffff8802003d7dc0
[227170.451623]  ffff88028049c6c0 ffff8802003d7c08 ffff8802003d7bf8 ffff88029d5147a0
[227170.452397] Call Trace:
[227170.453173]  [<ffffffff8120c1ed>] lookup_fast+0x26d/0x2f0
[227170.453959]  [<ffffffff812ff27c>] ? security_inode_permission+0x1c/0x30
[227170.454741]  [<ffffffff8120d327>] link_path_walk+0x1a7/0x880
[227170.455515]  [<ffffffff81218414>] ? dput+0x24/0x170
[227170.456278]  [<ffffffff8120d70b>] link_path_walk+0x58b/0x880
[227170.457054]  [<ffffffff8120da6b>] path_lookupat+0x6b/0x790
[227170.457830]  [<ffffffff811e48c5>] ? kmem_cache_alloc+0x35/0x1f0
[227170.458598]  [<ffffffff8120ca0f>] ? getname_flags+0x4f/0x1a0
[227170.459358]  [<ffffffff8120e1bb>] filename_lookup+0x2b/0xc0
[227170.460114]  [<ffffffff81212417>] user_path_at_empty+0x67/0xc0
[227170.460887]  [<ffffffff81206d0f>] ? cp_new_stat+0x14f/0x180
[227170.461650]  [<ffffffff81212481>] user_path_at+0x11/0x20
[227170.462417]  [<ffffffff81206803>] vfs_fstatat+0x63/0xc0
[227170.463176]  [<ffffffff81206d6e>] SYSC_newstat+0x2e/0x60
[227170.463933]  [<ffffffff81131436>] ? __audit_syscall_exit+0x1f6/0x2a0
[227170.464694]  [<ffffffff8120703e>] SyS_newstat+0xe/0x10
[227170.465459]  [<ffffffff817301a9>] system_call_fastpath+0x16/0x1b
[227170.466219] Code: 80 00 00 00 00 48 89 df 48 c7 45 b8 00 00 00 00 e8 70 ca 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 
[227170.467885] RIP  [<ffffffffa018bb06>] afs_linux_dentry_revalidate+0x2f6/0x520 [openafs]
[227170.468726]  RSP <ffff8802003d7b10>
[227170.469554] CR2: 0000000000000004
[227170.472293] ---[ end trace 5bfcc5c20169b249 ]---