*** This bug is a duplicate of bug 1516216 ***
https://bugs.launchpad.net/bugs/1516216
>From kern.log in comment #6
Aug 10 13:24:50 xxx1 kernel: [ 14.150733] BUG: unable to handle kernel NULL
pointer dereference at (null)
Aug 10 13:24:50 xxx1 kernel: [ 14.150737] IP: [<ffffffff81729f8b>]
__down_common+0x4c/0x144
Aug 10 13:24:50 xxx1 kernel: [ 14.150738] PGD 95f32067 PUD 95f31067 PMD 0
Aug 10 13:24:50 xxx1 kernel: [ 14.150739] Oops: 0002 [#1] SMP
Aug 10 13:24:50 xxx1 kernel: [ 14.150753] Modules linked in: acer_wmi(+)
sparse_keymap intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp
kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel
snd_hda_intel(+) aes_x86_64 arc4 lrw gf128mul snd_hda_codec glue_helper
ablk_helper cryptd snd_hwdep snd_pcm snd_page_alloc ath3k ath9k btusb
snd_seq_midi ath9k_common bluetooth snd_seq_midi_event ath9k_hw snd_rawmidi
joydev ath serio_raw mac80211 snd_seq cfg80211 snd_seq_device nvidia(POX+)
i915(+) snd_timer lpc_ich snd wmi mei_me video drm_kms_helper drm mei soundcore
mac_hid shpchp i2c_algo_bit parport_pc ppdev lp parport hid_generic usbhid hid
tg3 psmouse ahci sdhci_pci ptp libahci sdhci pps_core
Aug 10 13:24:50 xxx1 kernel: [ 14.150755] CPU: 2 PID: 533 Comm:
nvidia-persiste Tainted: P OX 3.13.0-61-generic #100-Ubuntu
Aug 10 13:24:50 xxx1 kernel: [ 14.150755] Hardware name: Acer Aspire
V3-571G/VA50_HC_CR, BIOS V2.07 10/15/2012
Aug 10 13:24:50 xxx1 kernel: [ 14.150756] task: ffff880245d14800 ti:
ffff880093fec000 task.ti: ffff880093fec000
Aug 10 13:24:50 xxx1 kernel: [ 14.150757] RIP: 0010:[<ffffffff81729f8b>]
[<ffffffff81729f8b>] __down_common+0x4c/0x144
Aug 10 13:24:50 xxx1 kernel: [ 14.150758] RSP: 0018:ffff880093fedb48 EFLAGS:
00010096
Aug 10 13:24:50 xxx1 kernel: [ 14.150759] RAX: 0000000000000000 RBX:
ffffffffa0b49430 RCX: 0000000000000000
Aug 10 13:24:50 xxx1 kernel: [ 14.150759] RDX: ffffffffa0b49438 RSI:
ffff880093fedb50 RDI: ffffffffa0b49430
Aug 10 13:24:50 xxx1 kernel: [ 14.150760] RBP: ffff880093fedb98 R08:
0000000000000296 R09: ffffffffa07478eb
Aug 10 13:24:50 xxx1 kernel: [ 14.150760] R10: 0000000000000030 R11:
0000000000000030 R12: 7fffffffffffffff
Aug 10 13:24:50 xxx1 kernel: [ 14.150760] R13: ffff880245d14800 R14:
0000000000000002 R15: 0000000000000000
Aug 10 13:24:50 xxx1 kernel: [ 14.150761] FS: 00007fe20489c740(0000)
GS:ffff88025f280000(0000) knlGS:0000000000000000
Aug 10 13:24:50 xxx1 kernel: [ 14.150762] CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
Aug 10 13:24:50 xxx1 kernel: [ 14.150762] CR2: 0000000000000000 CR3:
0000000095f33000 CR4: 00000000001407e0
Aug 10 13:24:50 xxx1 kernel: [ 14.150763] Stack:
Aug 10 13:24:50 xxx1 kernel: [ 14.150764] ffffffff81224ffd ffffffffa0b49438
0000000000000000 ffff880095fb97f8
Aug 10 13:24:50 xxx1 kernel: [ 14.150765] 0000000000000000 ffffffffa0b49430
ffff880090ae8000 ffff880036b1a300
Aug 10 13:24:50 xxx1 kernel: [ 14.150767] 0000000000000002 00000000000000ff
ffff880093fedba8 ffffffff8172a0a0
Aug 10 13:24:50 xxx1 kernel: [ 14.150767] Call Trace:
Aug 10 13:24:50 xxx1 kernel: [ 14.150771] [<ffffffff81224ffd>] ?
proc_alloc_inode+0x1d/0xb0
Aug 10 13:24:50 xxx1 kernel: [ 14.150773] [<ffffffff8172a0a0>]
__down+0x1d/0x1f
Aug 10 13:24:50 xxx1 kernel: [ 14.150775] [<ffffffff810b0f71>] down+0x41/0x50
Aug 10 13:24:50 xxx1 kernel: [ 14.150832] [<ffffffffa0747cc7>]
nvidia_open+0x467/0x930 [nvidia]
Aug 10 13:24:50 xxx1 kernel: [ 14.150875] [<ffffffffa0752bb9>]
nvidia_frontend_open+0x49/0xa0 [nvidia]
Aug 10 13:24:50 xxx1 kernel: [ 14.150877] [<ffffffff811c2ccf>]
chrdev_open+0x9f/0x1d0
Aug 10 13:24:50 xxx1 kernel: [ 14.150879] [<ffffffff811bb803>]
do_dentry_open+0x233/0x2e0
Aug 10 13:24:50 xxx1 kernel: [ 14.150880] [<ffffffff811c2c30>] ?
cdev_put+0x30/0x30
Aug 10 13:24:50 xxx1 kernel: [ 14.150882] [<ffffffff811bbb39>]
vfs_open+0x49/0x50
Aug 10 13:24:50 xxx1 kernel: [ 14.150884] [<ffffffff811ccee4>]
do_last+0x564/0x1240
Aug 10 13:24:50 xxx1 kernel: [ 14.150885] [<ffffffff811ca9a1>] ?
link_path_walk+0x71/0x880
Aug 10 13:24:50 xxx1 kernel: [ 14.150887] [<ffffffff81315ebb>] ?
apparmor_file_alloc_security+0x5b/0x180
Aug 10 13:24:50 xxx1 kernel: [ 14.150889] [<ffffffff811cdc7b>]
path_openat+0xbb/0x650
Aug 10 13:24:50 xxx1 kernel: [ 14.150891] [<ffffffff811ce232>] ?
final_putname+0x22/0x50
Aug 10 13:24:50 xxx1 kernel: [ 14.150892] [<ffffffff811ce439>] ?
putname+0x29/0x40
Aug 10 13:24:50 xxx1 kernel: [ 14.150894] [<ffffffff811cef8f>] ?
user_path_at_empty+0x5f/0x90
Aug 10 13:24:50 xxx1 kernel: [ 14.150895] [<ffffffff811cf07a>]
do_filp_open+0x3a/0x90
Aug 10 13:24:50 xxx1 kernel: [ 14.150897] [<ffffffff811dbf17>] ?
__alloc_fd+0xa7/0x130
Aug 10 13:24:50 xxx1 kernel: [ 14.150898] [<ffffffff811bd659>]
do_sys_open+0x129/0x280
Aug 10 13:24:50 xxx1 kernel: [ 14.150900] [<ffffffff811bd7ce>]
SyS_open+0x1e/0x20
Aug 10 13:24:50 xxx1 kernel: [ 14.150902] [<ffffffff817342dd>]
system_call_fastpath+0x1a/0x1f
Aug 10 13:24:50 xxx1 kernel: [ 14.150911] Code: 54 49 89 d4 48 8d 57 08 53 48
89 fb 48 83 e4 f0 48 83 ec 28 48 8b 47 10 48 8d 74 24 08 48 89 54 24 08 48 89
44 24 10 48 89 77 10 <48> 89 30 4c 89 f0 4c 89 6c 24 18 83 e0 01 c6 44 24 20 00
48 89
Aug 10 13:24:50 xxx1 kernel: [ 14.150912] RIP [<ffffffff81729f8b>]
__down_common+0x4c/0x144
Aug 10 13:24:50 xxx1 kernel: [ 14.150913] RSP <ffff880093fedb48>
Aug 10 13:24:50 xxx1 kernel: [ 14.150913] CR2: 0000000000000000
Aug 10 13:24:50 xxx1 kernel: [ 14.150914] ---[ end trace 7f8b15657dfb454a ]---
** This bug has been marked a duplicate of bug 1516216
X fails to start, starting with kernel version 3.13.0-66 including 3.13.0-68
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https://bugs.launchpad.net/bugs/1483388
Title:
System randomly won't complete boot
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