Happened to me on a 2012 Mac Mini. Have been running 14.04 for the past
few years with very few issues and going back to 4.4.0-112-generic
#135~14.04.1 fixes the issues I had.


-------------------------------------------------------
Feb  9 10:57:56 mini1 udisksd[2155]: Acquired the name org.freedesktop.UDisks2 
on the system message bus
Feb  9 10:58:08 mini1 kernel: [   43.098930] BUG: unable to handle kernel NULL 
pointer dereference at 0000000000000020
Feb  9 10:58:08 mini1 kernel: [   43.098970] IP: [<ffffffff813f6d54>] 
csum_and_copy_from_iter+0x14/0x4a0
Feb  9 10:58:08 mini1 kernel: [   43.099000] PGD 800000004e95b067 PUD 4e9a9067 
PMD 0
Feb  9 10:58:08 mini1 kernel: [   43.099023] Oops: 0000 [#1] SMP
Feb  9 10:58:08 mini1 kernel: [   43.099040] Modules linked in: autofs4 nfsd 
auth_rpcgss nfs_acl nfs rfcomm bnep lockd grace sunrpc fscache b43 mac80211 
cfg80211 ssb ir_sharp_decoder ir_lirc_codec ir_sanyo_decoder ir_jvc_decoder 
ir_rc5_decoder lirc_dev ir_rc6_decoder ir_mce_kbd_decoder ir_nec_decoder 
ir_sony_decoder ir_xmp_decoder rc_rc6_mce btusb applesmc btrtl mceusb btbcm 
btintel input_polldev rc_core intel_rapl bluetooth snd_hda_codec_hdmi 
x86_pkg_temp_thermal intel_powerclamp hid_appleir coretemp input_leds joydev 
snd_hda_codec_cirrus snd_hda_codec_generic kvm_intel snd_hda_intel kvm 
snd_hda_codec snd_hda_core snd_hwdep irqbypass i915 snd_pcm snd_seq_midi 
snd_seq_midi_event snd_rawmidi snd_seq crct10dif_pclmul snd_seq_device 
drm_kms_helper drm i2c_algo_bit crc32_pclmul snd_timer ghash_clmulni_intel 
fb_sys_fops syscopyarea sysfillrect snd sysimgblt soundcore apple_gmux bcma 
parport_pc cryptd ppdev mei_me apple_bl lp video mei shpchp mac_hid lpc_ich 
parport hid_generic usbhid hid firewire_ohci tg3 ahci firewire_core sdhci_pci 
libahci ptp sdhci crc_itu_t pps_core fjes
Feb  9 10:58:08 mini1 kernel: [   43.099613] CPU: 3 PID: 2277 Comm: ping Not 
tainted 4.4.0-113-generic #136~14.04.1-Ubuntu
Feb  9 10:58:08 mini1 kernel: [   43.099654] Hardware name: Apple Inc. 
Macmini5,1/Mac-8ED6AF5B48C039E1, BIOS MM51.88Z.0075.B00.1106271442 06/27/2011
Feb  9 10:58:08 mini1 kernel: [   43.099714] task: ffff880058a48000 ti: 
ffff88004ea5c000 task.ti: ffff88004ea5c000
Feb  9 10:58:08 mini1 kernel: [   43.099757] RIP: 0010:[<ffffffff813f6d54>]  
[<ffffffff813f6d54>] csum_and_copy_from_iter+0x14/0x4a0
Feb  9 10:58:08 mini1 kernel: [   43.099816] RSP: 0018:ffff88004ea5f980  
EFLAGS: 00010282
Feb  9 10:58:08 mini1 kernel: [   43.099847] RAX: 0000000000000000 RBX: 
0000000000000010 RCX: 0000000000000010
Feb  9 10:58:08 mini1 kernel: [   43.099890] RDX: ffff88004ea5f9f4 RSI: 
0000000000000040 RDI: ffff88005dbfc024
Feb  9 10:58:08 mini1 kernel: [   43.099931] RBP: ffff88004ea5f9e0 R08: 
0000000000000000 R09: ffff88004e96cc00
Feb  9 10:58:08 mini1 kernel: [   43.099974] R10: ffff88005dbfc024 R11: 
0000000000000040 R12: 0000000000000040
Feb  9 10:58:08 mini1 kernel: [   43.100015] R13: 0000000000000000 R14: 
ffff880058a48920 R15: ffff88005dbfc024
Feb  9 10:58:08 mini1 kernel: [   43.100059] FS:  00007f4c9232b740(0000) 
GS:ffff8801002c0000(0000) knlGS:0000000000000000
Feb  9 10:58:08 mini1 kernel: [   43.100106] CS:  0010 DS: 0000 ES: 0000 CR0: 
0000000080050033
Feb  9 10:58:08 mini1 kernel: [   43.100141] CR2: 0000000000000020 CR3: 
000000004e96e000 CR4: 0000000000060670
Feb  9 10:58:08 mini1 kernel: [   43.100182] Stack:
Feb  9 10:58:08 mini1 kernel: [   43.100197]  ffffffff816ff48e ffff88004e96cc00 
ffff88004ea5fa0f 00000000024000c0
Feb  9 10:58:08 mini1 kernel: [   43.100249]  00000000000001c0 00000000ffffffff 
ffff88004ea5f9f0 ffff88004e96cc00
Feb  9 10:58:08 mini1 kernel: [   43.100300]  0000000000000040 0000000000000000 
ffff880058a48920 ffff88005dbfc024
Feb  9 10:58:08 mini1 kernel: [   43.100350] Call Trace:
Feb  9 10:58:08 mini1 kernel: [   43.100371]  [<ffffffff816ff48e>] ? 
__alloc_skb+0x7e/0x280
Feb  9 10:58:08 mini1 kernel: [   43.100409]  [<ffffffff81752f17>] 
ip_generic_getfrag+0x47/0xd0
Feb  9 10:58:08 mini1 kernel: [   43.100446]  [<ffffffff8177aecd>] 
raw_getfrag+0xad/0x100
Feb  9 10:58:08 mini1 kernel: [   43.100481]  [<ffffffff817547a2>] 
__ip_append_data.isra.46+0x832/0xa30
Feb  9 10:58:08 mini1 kernel: [   43.100520]  [<ffffffff8177ae20>] ? 
raw_recvmsg+0x1b0/0x1b0
Feb  9 10:58:08 mini1 kernel: [   43.100557]  [<ffffffff81752e17>] ? 
ip_setup_cork+0xc7/0x120
Feb  9 10:58:08 mini1 kernel: [   43.100592]  [<ffffffff8177ae20>] ? 
raw_recvmsg+0x1b0/0x1b0
Feb  9 10:58:08 mini1 kernel: [   43.100628]  [<ffffffff817553f3>] 
ip_append_data+0x83/0xf0
Feb  9 10:58:08 mini1 kernel: [   43.100663]  [<ffffffff8177bb4e>] 
raw_sendmsg+0x71e/0xb60
Feb  9 10:58:08 mini1 kernel: [   43.100699]  [<ffffffff8138a528>] ? 
aa_sk_perm+0x78/0x230
Feb  9 10:58:08 mini1 kernel: [   43.100734]  [<ffffffff8138aded>] ? 
aa_sock_msg_perm+0x5d/0x140
Feb  9 10:58:08 mini1 kernel: [   43.100771]  [<ffffffff8178b01d>] 
inet_sendmsg+0x6d/0xa0
Feb  9 10:58:08 mini1 kernel: [   43.100806]  [<ffffffff816f6b8e>] 
sock_sendmsg+0x3e/0x50
Feb  9 10:58:08 mini1 kernel: [   43.100840]  [<ffffffff816f74c6>] 
___sys_sendmsg+0x276/0x290
Feb  9 10:58:08 mini1 kernel: [   43.100876]  [<ffffffff81197537>] ? 
lru_cache_add_active_or_unevictable+0x27/0x90
Feb  9 10:58:08 mini1 kernel: [   43.100924]  [<ffffffff811b79be>] ? 
handle_pte_fault+0xbae/0x1440
Feb  9 10:58:08 mini1 kernel: [   43.100963]  [<ffffffff818195ae>] ? 
_raw_spin_unlock_bh+0x1e/0x20
Feb  9 10:58:08 mini1 kernel: [   43.101003]  [<ffffffff816f7e22>] 
__sys_sendmsg+0x42/0x80
Feb  9 10:58:08 mini1 kernel: [   43.101038]  [<ffffffff816f7e72>] 
SyS_sendmsg+0x12/0x20
Feb  9 10:58:08 mini1 kernel: [   43.101072]  [<ffffffff81819b5f>] 
entry_SYSCALL_64_fastpath+0x1c/0x97
Feb  9 10:58:08 mini1 kernel: [   43.101110] Code: e7 e8 04 ec 01 00 48 89 d8 
e9 5d fe ff ff 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 41 55 41 54 
53 48 89 cb 48 83 ec 38 <4c> 8b 61 10 48 89 55 c0 4c 39 e6 4c 0f 46 e6 4d 85 e4 
0f 84 f2
Feb  9 10:58:08 mini1 kernel: [   43.101341] RIP  [<ffffffff813f6d54>] 
csum_and_copy_from_iter+0x14/0x4a0
Feb  9 10:58:08 mini1 kernel: [   43.101386]  RSP <ffff88004ea5f980>
Feb  9 10:58:08 mini1 kernel: [   43.101408] CR2: 0000000000000020
Feb  9 10:58:08 mini1 kernel: [   43.109948] ---[ end trace 20d7163eb1bfbc83 
]---
-------------------------------------------------------

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Title:
  Ping hangs with kernel oops

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