BUG: unable to handle kernel NULL pointer dereference at 0000000000000098
IP: [<ffffffff811ea734>] tty_reopen+0x3a/0x9e
PGD 139ea8067 PUD 139e81067 PMD 0
Oops: 0000 [#1] SMP
CPU 0
Modules linked in: snd_hda_codec_analog sr_mod cdrom powernow_k8 mperf freq_table kvm_amd ehci_hcd snd_hda_intel snd_hda_codec snd_pcm pata_amd kvm forcedeth ohci_amd usbcore usb_common k8temp snd_page_alloc snd_timer snd soundcore

Pid: 1287, comm: devfs Not tainted 3.5.0-rc7-ija1+ #94 System manufacturer System Product Name/M2N-E
RIP: 0010:[<ffffffff811ea734>]  [<ffffffff811ea734>] tty_reopen+0x3a/0x9e
RSP: 0018:ffff880139ea1bc8  EFLAGS: 00010246
RAX: 00000000fffffffb RBX: ffff880139e4e800 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff880139e4e838 RDI: ffff880139d8c000
RBP: ffff880139ea1bd8 R08: ffff880139ea1e58 R09: 00007fffffffffff
R10: 00007fffffffffff R11: ffff880139ea1de0 R12: ffff880139d8c000
R13: 0000000000200001 R14: ffff88013a18b690 R15: 0000000000008002
FS:  00007f80396d6700(0000) GS:ffff88013fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000098 CR3: 0000000139ea2000 CR4: 00000000000007f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process devfs (pid: 1287, threadinfo ffff880139ea0000, task ffff88013a18b690)
Stack:
  ffff880139e4e800 ffff88013a80abf8 ffff880139ea1c48 ffffffff811ed0d7
  ffff880139d8c000 ffff880139e4e838 fffffffb39ea1c28 ffff88013a813c00
  0000000000000072 0000000100000000 ffff880139ea1c48 ffff88013a80abf8
Call Trace:
 [<ffffffff811ed0d7>] tty_open+0x132/0x37a
 [<ffffffff810dd841>] chrdev_open+0x120/0x149
 [<ffffffff810dd721>] ? cdev_put+0x20/0x20
 [<ffffffff810d8f22>] do_dentry_open.isra.18+0x162/0x231
 [<ffffffff810d9bb1>] nameidata_to_filp+0x3d/0x7f
 [<ffffffff810e594e>] do_last+0x546/0x6f1
 [<ffffffff810e61ff>] path_openat+0xc7/0x359
 [<ffffffff810c27f3>] ? handle_mm_fault+0x162/0x177
 [<ffffffff810e657a>] do_filp_open+0x33/0x81
 [<ffffffff810effe5>] ? alloc_fd+0x6d/0xfc
 [<ffffffff810d9cf3>] do_sys_open+0x100/0x192
 [<ffffffff810d9da1>] sys_open+0x1c/0x1e
 [<ffffffff813efa22>] system_call_fastpath+0x16/0x1b
Code: 48 8b 8f 28 01 00 00 48 8b 57 10 80 e1 80 75 7a 48 8b 8f 28 01 00 00 f7 c1 00 00 20 00 75 6b 48 8b 8f 28 01 00 00 80 e5 04 75 5f <81> ba 98 00 00 00 04 00 01 00 75 16 83 bf 30 01 00 00 00 75 4a
RIP  [<ffffffff811ea734>] tty_reopen+0x3a/0x9e
 RSP <ffff880139ea1bc8>
CR2: 0000000000000098
---[ end trace 9bcec26548bea90d ]---