I'm also affected by this bug:
- 4.15.0-151-generic freezes
- 4.15.0-147-generic does not freeze (previous available kernel in grub)

My CPU:  Intel(R) Core(TM) i7-7700T CPU @ 2.90GHz

The freeze happens generally at the login screenshot (sometimes before,
sometimes after, but shortly after booting in any cases).

I am forced to reboot my computer and select the older kernel in grub to 
properly boot.
In /var/log/kern.log I see Oops:
```
Jul 31 08:02:02 pel-cirrus7 kernel: [    5.760459] usbcore: registered new 
interface driver snd-usb-audio
Jul 31 08:02:02 pel-cirrus7 kernel: [    5.782978] Bluetooth: BNEP (Ethernet 
Emulation) ver 1.3
Jul 31 08:02:02 pel-cirrus7 kernel: [    5.782979] Bluetooth: BNEP filters: 
protocol multicast
Jul 31 08:02:02 pel-cirrus7 kernel: [    5.782981] Bluetooth: BNEP socket layer 
initialized
Jul 31 08:02:02 pel-cirrus7 kernel: [    5.994114] IPv6: ADDRCONF(NETDEV_UP): 
enp0s31f6: link is not ready
Jul 31 08:02:02 pel-cirrus7 kernel: [    6.185403] IPv6: ADDRCONF(NETDEV_UP): 
enp0s31f6: link is not ready
Jul 31 08:02:02 pel-cirrus7 kernel: [    6.190802] IPv6: ADDRCONF(NETDEV_UP): 
enp4s0: link is not ready
Jul 31 08:02:02 pel-cirrus7 kernel: [    6.239802] r8169 0000:04:00.0 enp4s0: 
link down
Jul 31 08:02:02 pel-cirrus7 kernel: [    6.239893] IPv6: ADDRCONF(NETDEV_UP): 
enp4s0: link is not ready
Jul 31 08:02:02 pel-cirrus7 kernel: [    6.242976] IPv6: ADDRCONF(NETDEV_UP): 
wlp2s0: link is not ready
Jul 31 08:02:02 pel-cirrus7 kernel: [    6.248737] ip6_tables: (C) 2000-2006 
Netfilter Core Team
Jul 31 08:02:02 pel-cirrus7 kernel: [    6.270569] Ebtables v2.0 registered
Jul 31 08:02:02 pel-cirrus7 kernel: [    6.337871] IPv6: ADDRCONF(NETDEV_UP): 
wlp2s0: link is not ready
Jul 31 08:02:02 pel-cirrus7 kernel: [    6.405469] IPv6: ADDRCONF(NETDEV_UP): 
wlp2s0: link is not ready
Jul 31 08:02:03 pel-cirrus7 kernel: [    6.774881] bridge: filtering via 
arp/ip/ip6tables is no longer available by default. Update your scripts to load 
br_netfilter if you need this.
Jul 31 08:02:03 pel-cirrus7 kernel: [    6.775624] virbr0: port 1(virbr0-nic) 
entered blocking state
Jul 31 08:02:03 pel-cirrus7 kernel: [    6.775625] virbr0: port 1(virbr0-nic) 
entered disabled state
Jul 31 08:02:03 pel-cirrus7 kernel: [    6.775673] device virbr0-nic entered 
promiscuous mode
Jul 31 08:02:03 pel-cirrus7 kernel: [    6.852658] nf_conntrack version 0.5.0 
(65536 buckets, 262144 max)
Jul 31 08:02:03 pel-cirrus7 kernel: [    7.331935] virbr0: port 1(virbr0-nic) 
entered blocking state
Jul 31 08:02:03 pel-cirrus7 kernel: [    7.331937] virbr0: port 1(virbr0-nic) 
entered listening state
Jul 31 08:02:03 pel-cirrus7 kernel: [    7.372079] virbr0: port 1(virbr0-nic) 
entered disabled state
Jul 31 08:02:06 pel-cirrus7 kernel: [    9.928363] wlp2s0: authenticate with 
ec:8a:4c:94:01:aa
Jul 31 08:02:06 pel-cirrus7 kernel: [    9.932925] wlp2s0: send auth to 
ec:8a:4c:94:01:aa (try 1/3)
Jul 31 08:02:06 pel-cirrus7 kernel: [    9.935089] wlp2s0: authenticated
Jul 31 08:02:06 pel-cirrus7 kernel: [    9.937297] wlp2s0: associate with 
ec:8a:4c:94:01:aa (try 1/3)
Jul 31 08:02:06 pel-cirrus7 kernel: [    9.940968] wlp2s0: RX AssocResp from 
ec:8a:4c:94:01:aa (capab=0x411 status=0 aid=4)
Jul 31 08:02:06 pel-cirrus7 kernel: [    9.943040] wlp2s0: associated
Jul 31 08:02:06 pel-cirrus7 kernel: [    9.976222] IPv6: 
ADDRCONF(NETDEV_CHANGE): wlp2s0: link becomes ready
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143178] BUG: unable to handle kernel 
paging request at ffff8c1a10e5f224
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143192] IP: 
kmem_cache_alloc+0x7a/0x1c0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143195] PGD 22a799067 P4D 22a799067 
PUD 0 
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143201] Oops: 0000 [#1] SMP PTI
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143204] Modules linked in: ccm 
xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat 
nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack 
libcrc32c ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc devlink 
ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter cmac bnep 
snd_hda_codec_hdmi snd_hda_codec_realtek eeepc_wmi asus_wmi 
snd_hda_codec_generic intel_rapl x86_pkg_temp_thermal sparse_keymap 
intel_powerclamp wmi_bmof coretemp mxm_wmi arc4 snd_hda_intel crct10dif_pclmul 
crc32_pclmul snd_usb_audio snd_hda_codec ghash_clmulni_intel snd_hda_core 
snd_usbmidi_lib pcbc snd_hwdep snd_seq_midi snd_seq_midi_event iwlmvm 
snd_rawmidi aesni_intel btusb aes_x86_64 btrtl crypto_simd btbcm glue_helper 
mac80211 joydev uvcvideo cryptd snd_pcm snd_seq
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143244]  i915 videobuf2_vmalloc 
btintel videobuf2_memops videobuf2_v4l2 input_leds bluetooth videobuf2_core 
videodev media intel_cstate iwlwifi snd_seq_device ecdh_generic intel_rapl_perf 
snd_timer drm_kms_helper snd cfg80211 drm i2c_algo_bit fb_sys_fops mei_me 
syscopyarea sysfillrect serio_raw soundcore mei sysimgblt shpchp wmi video 
acpi_pad mac_hid binfmt_misc kvm_intel kvm irqbypass sch_fq_codel parport_pc 
ppdev lp parport ip_tables x_tables autofs4 hid_apple hid_generic usbhid hid 
e1000e r8169 nvme ahci ptp psmouse pps_core nvme_core mii libahci
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143281] CPU: 1 PID: 1471 Comm: 
udevadm Not tainted 4.15.0-151-generic #157-Ubuntu
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143284] Hardware name: System 
manufacturer System Product Name/Q170T, BIOS 3402 04/07/2017
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143288] RIP: 
0010:kmem_cache_alloc+0x7a/0x1c0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143291] RSP: 0018:ffffa01dc2697c50 
EFLAGS: 00010286
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143295] RAX: ffff8c1a10e5f224 RBX: 
00000000014080c0 RCX: ffff8c789a5834d0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143297] RDX: 0000000000005158 RSI: 
00000000014080c0 RDI: 0000000000027080
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143299] RBP: ffffa01dc2697c80 R08: 
ffff8c78b5c67080 R09: ffffffffffffffc0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143302] R10: ffffa01dc2697eb8 R11: 
0000000000000000 R12: ffff8c1a10e5f224
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143304] R13: 00000000014080c0 R14: 
ffff8c78a5205c80 R15: ffff8c78a5205c80
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143308] FS:  00007f6ccf039680(0000) 
GS:ffff8c78b5c40000(0000) knlGS:0000000000000000
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143310] CS:  0010 DS: 0000 ES: 0000 
CR0: 0000000080050033
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143313] CR2: ffff8c1a10e5f224 CR3: 
00000003f4054003 CR4: 00000000003606e0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143315] DR0: 0000000000000000 DR1: 
0000000000000000 DR2: 0000000000000000
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143318] DR3: 0000000000000000 DR6: 
00000000fffe0ff0 DR7: 0000000000000400
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143320] Call Trace:
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143327]  ? get_empty_filp+0x5c/0x1c0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143332]  get_empty_filp+0x5c/0x1c0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143339]  ? _cond_resched+0x19/0x40
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143344]  path_openat+0x40/0x18b0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143348]  ? mntput+0x24/0x40
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143352]  ? terminate_walk+0xe5/0x100
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143356]  ? path_lookupat+0xaa/0x1f0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143361]  do_filp_open+0x9b/0x110
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143367]  ? 
__check_object_size+0xc8/0x1b0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143373]  ? __alloc_fd+0x46/0x170
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143378]  do_sys_open+0x1ba/0x2c0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143383]  ? do_sys_open+0x1ba/0x2c0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143387]  ? __put_cred+0x51/0x60
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143392]  ? SyS_access+0x147/0x230
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143397]  SyS_openat+0x14/0x20
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143402]  do_syscall_64+0x73/0x130
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143406]  
entry_SYSCALL_64_after_hwframe+0x41/0xa6
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143410] RIP: 0033:0x7f6cceb61d5e
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143413] RSP: 002b:00007fff3caf6260 
EFLAGS: 00000246 ORIG_RAX: 0000000000000101
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143416] RAX: ffffffffffffffda RBX: 
000055ac56143ac0 RCX: 00007f6cceb61d5e
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143418] RDX: 0000000000080000 RSI: 
00007fff3caf6450 RDI: 00000000ffffff9c
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143421] RBP: 000055ac54d58c0b R08: 
0000000000000000 R09: 000055ac54d58c0d
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143423] R10: 0000000000000000 R11: 
0000000000000246 R12: 0000000000000008
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143425] R13: 000055ac54d58c0b R14: 
000055ac561537b0 R15: 00007fff3caf6450
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143428] Code: 50 08 65 4c 03 05 0f 
d5 1b 54 49 83 78 10 00 4d 8b 20 0f 84 09 01 00 00 4d 85 e4 0f 84 00 01 00 00 
49 63 47 20 49 8b 3f 4c 01 e0 <48> 8b 18 49 33 9f 40 01 00 00 48 89 c1 48 0f c9 
4c 89 e0 48 31 
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143463] RIP: 
kmem_cache_alloc+0x7a/0x1c0 RSP: ffffa01dc2697c50
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143465] CR2: ffff8c1a10e5f224
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.143468] ---[ end trace 
901cb03a2e22b099 ]---
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.147985] BUG: unable to handle kernel 
paging request at ffff8c1a10e5f224
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.147996] IP: 
kmem_cache_alloc+0x7a/0x1c0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.147998] PGD 22a799067 P4D 22a799067 
PUD 0 
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148004] Oops: 0000 [#2] SMP PTI
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148007] Modules linked in: ccm 
xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat 
nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack 
libcrc32c ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc devlink 
ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter cmac bnep 
snd_hda_codec_hdmi snd_hda_codec_realtek eeepc_wmi asus_wmi 
snd_hda_codec_generic intel_rapl x86_pkg_temp_thermal sparse_keymap 
intel_powerclamp wmi_bmof coretemp mxm_wmi arc4 snd_hda_intel crct10dif_pclmul 
crc32_pclmul snd_usb_audio snd_hda_codec ghash_clmulni_intel snd_hda_core 
snd_usbmidi_lib pcbc snd_hwdep snd_seq_midi snd_seq_midi_event iwlmvm 
snd_rawmidi aesni_intel btusb aes_x86_64 btrtl crypto_simd btbcm glue_helper 
mac80211 joydev uvcvideo cryptd snd_pcm snd_seq
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148042]  i915 videobuf2_vmalloc 
btintel videobuf2_memops videobuf2_v4l2 input_leds bluetooth videobuf2_core 
videodev media intel_cstate iwlwifi snd_seq_device ecdh_generic intel_rapl_perf 
snd_timer drm_kms_helper snd cfg80211 drm i2c_algo_bit fb_sys_fops mei_me 
syscopyarea sysfillrect serio_raw soundcore mei sysimgblt shpchp wmi video 
acpi_pad mac_hid binfmt_misc kvm_intel kvm irqbypass sch_fq_codel parport_pc 
ppdev lp parport ip_tables x_tables autofs4 hid_apple hid_generic usbhid hid 
e1000e r8169 nvme ahci ptp psmouse pps_core nvme_core mii libahci
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148074] CPU: 1 PID: 310 Comm: 
systemd-journal Tainted: G      D          4.15.0-151-generic #157-Ubuntu
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148077] Hardware name: System 
manufacturer System Product Name/Q170T, BIOS 3402 04/07/2017
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148082] RIP: 
0010:kmem_cache_alloc+0x7a/0x1c0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148085] RSP: 0018:ffffa01dc1e8fc50 
EFLAGS: 00010286
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148088] RAX: ffff8c1a10e5f224 RBX: 
00000000014080c0 RCX: ffff8c789aaea9d0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148091] RDX: 0000000000005158 RSI: 
00000000014080c0 RDI: 0000000000027080
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148093] RBP: ffffa01dc1e8fc80 R08: 
ffff8c78b5c67080 R09: fffc400000008000
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148095] R10: ffffa01dc1e8feb8 R11: 
0000000000000000 R12: ffff8c1a10e5f224
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148098] R13: 00000000014080c0 R14: 
ffff8c78a5205c80 R15: ffff8c78a5205c80
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148101] FS:  00007fc2b7a95940(0000) 
GS:ffff8c78b5c40000(0000) knlGS:0000000000000000
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148104] CS:  0010 DS: 0000 ES: 0000 
CR0: 0000000080050033
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148106] CR2: ffff8c1a10e5f224 CR3: 
000000041ba0e005 CR4: 00000000003606e0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148109] DR0: 0000000000000000 DR1: 
0000000000000000 DR2: 0000000000000000
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148111] DR3: 0000000000000000 DR6: 
00000000fffe0ff0 DR7: 0000000000000400
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148113] Call Trace:
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148119]  ? get_empty_filp+0x5c/0x1c0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148125]  get_empty_filp+0x5c/0x1c0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148130]  ? set_page_dirty+0x5e/0xb0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148134]  path_openat+0x40/0x18b0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148140]  ? put_dec+0x18/0xa0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148144]  ? number+0x30a/0x330
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148150]  ? 
__unlock_page_memcg+0x30/0x50
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148154]  ? ___slab_alloc+0x10b/0x4f0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148158]  ? ___slab_alloc+0x10b/0x4f0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148163]  do_filp_open+0x9b/0x110
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148168]  ? 
__check_object_size+0xc8/0x1b0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148174]  ? __alloc_fd+0x46/0x170
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148179]  do_sys_open+0x1ba/0x2c0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148184]  ? do_sys_open+0x1ba/0x2c0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148189]  SyS_openat+0x14/0x20
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148194]  do_syscall_64+0x73/0x130
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148198]  
entry_SYSCALL_64_after_hwframe+0x41/0xa6
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148202] RIP: 0033:0x7fc2b75c7de9
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148204] RSP: 002b:00007ffe6bb4f540 
EFLAGS: 00000293 ORIG_RAX: 0000000000000101
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148207] RAX: ffffffffffffffda RBX: 
0000000000000105 RCX: 00007fc2b75c7de9
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148210] RDX: 0000000000080002 RSI: 
000055a1444f9c00 RDI: 00000000ffffff9c
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148212] RBP: 00007ffe6bb4f800 R08: 
0000000000000000 R09: 0000000000000000
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148214] R10: 0000000000000000 R11: 
0000000000000293 R12: 00000000ffffffff
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148216] R13: 000055a1444d4e90 R14: 
000055a1444e4660 R15: 00007ffe6bb4f7c0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148220] Code: 50 08 65 4c 03 05 0f 
d5 1b 54 49 83 78 10 00 4d 8b 20 0f 84 09 01 00 00 4d 85 e4 0f 84 00 01 00 00 
49 63 47 20 49 8b 3f 4c 01 e0 <48> 8b 18 49 33 9f 40 01 00 00 48 89 c1 48 0f c9 
4c 89 e0 48 31 
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148255] RIP: 
kmem_cache_alloc+0x7a/0x1c0 RSP: ffffa01dc1e8fc50
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148257] CR2: ffff8c1a10e5f224
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.148260] ---[ end trace 
901cb03a2e22b09a ]---
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223339] BUG: unable to handle kernel 
paging request at ffff8c1a10e5f224
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223356] IP: 
kmem_cache_alloc+0x7a/0x1c0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223360] PGD 22a799067 P4D 22a799067 
PUD 0 
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223368] Oops: 0000 [#3] SMP PTI
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223372] Modules linked in: ccm 
xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat 
nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack 
libcrc32c ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc devlink 
ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter cmac bnep 
snd_hda_codec_hdmi snd_hda_codec_realtek eeepc_wmi asus_wmi 
snd_hda_codec_generic intel_rapl x86_pkg_temp_thermal sparse_keymap 
intel_powerclamp wmi_bmof coretemp mxm_wmi arc4 snd_hda_intel crct10dif_pclmul 
crc32_pclmul snd_usb_audio snd_hda_codec ghash_clmulni_intel snd_hda_core 
snd_usbmidi_lib pcbc snd_hwdep snd_seq_midi snd_seq_midi_event iwlmvm 
snd_rawmidi aesni_intel btusb aes_x86_64 btrtl crypto_simd btbcm glue_helper 
mac80211 joydev uvcvideo cryptd snd_pcm snd_seq
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223424]  i915 videobuf2_vmalloc 
btintel videobuf2_memops videobuf2_v4l2 input_leds bluetooth videobuf2_core 
videodev media intel_cstate iwlwifi snd_seq_device ecdh_generic intel_rapl_perf 
snd_timer drm_kms_helper snd cfg80211 drm i2c_algo_bit fb_sys_fops mei_me 
syscopyarea sysfillrect serio_raw soundcore mei sysimgblt shpchp wmi video 
acpi_pad mac_hid binfmt_misc kvm_intel kvm irqbypass sch_fq_codel parport_pc 
ppdev lp parport ip_tables x_tables autofs4 hid_apple hid_generic usbhid hid 
e1000e r8169 nvme ahci ptp psmouse pps_core nvme_core mii libahci
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223473] CPU: 1 PID: 1475 Comm: 
systemd-journal Tainted: G      D          4.15.0-151-generic #157-Ubuntu
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223477] Hardware name: System 
manufacturer System Product Name/Q170T, BIOS 3402 04/07/2017
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223484] RIP: 
0010:kmem_cache_alloc+0x7a/0x1c0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223487] RSP: 0018:ffffa01dc269fc50 
EFLAGS: 00010286
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223492] RAX: ffff8c1a10e5f224 RBX: 
00000000014080c0 RCX: ffff8c7874336700
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223495] RDX: 000000000000516e RSI: 
00000000014080c0 RDI: 0000000000027080
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223499] RBP: ffffa01dc269fc80 R08: 
ffff8c78b5c67080 R09: fffe000000000000
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223502] R10: ffffa01dc269feb8 R11: 
0000000000000000 R12: ffff8c1a10e5f224
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223505] R13: 00000000014080c0 R14: 
ffff8c78a5205c80 R15: ffff8c78a5205c80
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223510] FS:  00007fbd9cf2f940(0000) 
GS:ffff8c78b5c40000(0000) knlGS:0000000000000000
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223513] CS:  0010 DS: 0000 ES: 0000 
CR0: 0000000080050033
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223517] CR2: ffff8c1a10e5f224 CR3: 
000000041bd78006 CR4: 00000000003606e0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223521] DR0: 0000000000000000 DR1: 
0000000000000000 DR2: 0000000000000000
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223524] DR3: 0000000000000000 DR6: 
00000000fffe0ff0 DR7: 0000000000000400
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223526] Call Trace:
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223536]  ? get_empty_filp+0x5c/0x1c0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223543]  get_empty_filp+0x5c/0x1c0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223550]  path_openat+0x40/0x18b0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223556]  ? filename_lookup+0xf2/0x190
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223564]  do_filp_open+0x9b/0x110
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223572]  ? 
__check_object_size+0xc8/0x1b0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223579]  ? __alloc_fd+0x46/0x170
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223587]  do_sys_open+0x1ba/0x2c0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223593]  ? do_sys_open+0x1ba/0x2c0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223601]  SyS_openat+0x14/0x20
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223608]  do_syscall_64+0x73/0x130
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223614]  
entry_SYSCALL_64_after_hwframe+0x41/0xa6
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223619] RIP: 0033:0x7fbd9ca61f83
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223622] RSP: 002b:00007ffd6eb57bb0 
EFLAGS: 00000246 ORIG_RAX: 0000000000000101
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223626] RAX: ffffffffffffffda RBX: 
00005595d5aca9c0 RCX: 00007fbd9ca61f83
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223630] RDX: 00000000000e0800 RSI: 
00005595d5ac0740 RDI: 0000000000000030
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223633] RBP: 00007fbd9cf2f8c0 R08: 
0000000000000001 R09: 0000000000000000
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223636] R10: 0000000000000000 R11: 
0000000000000246 R12: 0000000000000001
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223639] R13: 00005595d5ac0740 R14: 
0000000000000030 R15: 00005595d5acab2b
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223643] Code: 50 08 65 4c 03 05 0f 
d5 1b 54 49 83 78 10 00 4d 8b 20 0f 84 09 01 00 00 4d 85 e4 0f 84 00 01 00 00 
49 63 47 20 49 8b 3f 4c 01 e0 <48> 8b 18 49 33 9f 40 01 00 00 48 89 c1 48 0f c9 
4c 89 e0 48 31 
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223691] RIP: 
kmem_cache_alloc+0x7a/0x1c0 RSP: ffffa01dc269fc50
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223694] CR2: ffff8c1a10e5f224
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.223699] ---[ end trace 
901cb03a2e22b09b ]---
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.253191] BUG: unable to handle kernel 
paging request at ffff8c1a10e5f224
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.253205] IP: 
kmem_cache_alloc+0x7a/0x1c0
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.253207] PGD 22a799067 P4D 22a799067 
PUD 0 
Jul 31 08:02:08 pel-cirrus7 kernel: [   12.253214] Oops: 0000 [#4] SMP PTI
etc.
```

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https://bugs.launchpad.net/bugs/1938013

Title:
  4.15.0-151 is freezing various CPUs

Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  From: https://askubuntu.com/questions/1353859/ubuntu-18-04-05-lts-
  desktop-hangs-with-since-kernel-4-15-0-151-and-systemd-237-3

  Several crashes in /var/crash, here's the last one:-

  ProblemType: KernelOops
  Annotation: Your system might become unstable now and might need to be 
restarted.
  Date: Fri Jul 23 18:10:54 2021
  Failure: oops
  OopsText:
   BUG: Bad rss-counter state mm:00000000c098a229 idx:2 val:-1
   usblp0: removed
   usblp 1-5:1.0: usblp0: USB Bidirectional printer dev 3 if 0 alt 0 proto 2 
vid 0x04F9 pid 0x02EC
   <44>[   18.329026] systemd-journald[358]: File 
/var/log/journal/b022dca21fd4480baeeb84f47ab439d3/user-1000.journal corrupted 
or uncleanly shut down, renaming and replacing.
   vboxdrv: loading out-of-tree module taints kernel.
   vboxdrv: module verification failed: signature and/or required key missing - 
tainting kernel
   vboxdrv: Found 8 processor cores
   vboxdrv: TSC mode is Invariant, tentative frequency 2303999142 Hz
   vboxdrv: Successfully loaded version 6.1.24 r145767 (interface 0x00300000)
   VBoxNetFlt: Successfully started.
   VBoxNetAdp: Successfully started.
   Bluetooth: RFCOMM TTY layer initialized
   Bluetooth: RFCOMM socket layer initialized
   Bluetooth: RFCOMM ver 1.11
   rfkill: input handler disabled
   [UFW BLOCK] IN=enp3s0f1 OUT= MAC=01:00:5e:00:00:01:80:20:da:95:bc:56:08:00 
SRC=192.168.1.254 DST=224.0.0.1 LEN=36 TOS=0x00 PREC=0x00 TTL=1 ID=0 DF PROTO=2 
   [UFW BLOCK] IN=wlp2s0 OUT= MAC=01:00:5e:00:00:01:80:20:da:95:bc:56:08:00 
SRC=192.168.1.254 DST=224.0.0.1 LEN=36 TOS=0x00 PREC=0x00 TTL=1 ID=0 DF PROTO=2 
   [UFW BLOCK] IN=enp3s0f1 OUT= MAC=01:00:5e:00:00:01:80:20:da:95:bc:56:08:00 
SRC=192.168.1.254 DST=224.0.0.1 LEN=36 TOS=0x00 PREC=0x00 TTL=1 ID=0 DF PROTO=2 
   [UFW BLOCK] IN=wlp2s0 OUT= MAC=01:00:5e:00:00:01:80:20:da:95:bc:56:08:00 
SRC=192.168.1.254 DST=224.0.0.1 LEN=36 TOS=0x00 PREC=0x00 TTL=1 ID=0 DF PROTO=2 
   [UFW BLOCK] IN=enp3s0f1 OUT= MAC=01:00:5e:00:00:01:80:20:da:95:bc:56:08:00 
SRC=192.168.1.254 DST=224.0.0.1 LEN=36 TOS=0x00 PREC=0x00 TTL=1 ID=0 DF PROTO=2 
   [UFW BLOCK] IN=wlp2s0 OUT= MAC=01:00:5e:00:00:01:80:20:da:95:bc:56:08:00 
SRC=192.168.1.254 DST=224.0.0.1 LEN=36 TOS=0x00 PREC=0x00 TTL=1 ID=0 DF PROTO=2 
   
  Package: linux-image-4.15.0-151-generic 4.15.0-151.157
  SourcePackage: linux
  Tags: kernel-oops
  Uname: Linux 4.15.0-151-generic x86_64
  
---------------------------------------------------------------------------------------
  The system is a laptop from Entroware based on Clevo and has 8 logical CPUs:-
  Architecture:        x86_64
  CPU op-mode(s):      32-bit, 64-bit
  Byte Order:          Little Endian
  CPU(s):              8
  On-line CPU(s) list: 0-7
  Thread(s) per core:  2
  Core(s) per socket:  4
  Socket(s):           1
  NUMA node(s):        1
  Vendor ID:           GenuineIntel
  CPU family:          6
  Model:               158
  Model name:          Intel(R) Core(TM) i5-8300H CPU @ 2.30GHz
  Stepping:            10
  CPU MHz:             2000.295
  CPU max MHz:         4000.0000
  CPU min MHz:         800.0000
  BogoMIPS:            4599.93
  Virtualisation:      VT-x
  L1d cache:           32K
  L1i cache:           32K
  L2 cache:            256K
  L3 cache:            8192K
  NUMA node0 CPU(s):   0-7
  Flags:               fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca 
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx 
pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl 
xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx 
est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt 
tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch 
cpuid_fault epb invpcid_single pti ssbd ibrs ibpb stibp tpr_shadow vnmi 
flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx 
rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves dtherm ida 
arat pln pts hwp hwp_notify hwp_act_window hwp_epp md_clear flush_l1d

  USB Config:-
  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
  Bus 001 Device 004: ID 5986:2110 Acer, Inc 
  Bus 001 Device 003: ID 04f9:02ec Brother Industries, Ltd MFC-J870DW
  Bus 001 Device 005: ID 8087:07dc Intel Corp. Bluetooth wireless interface
  Bus 001 Device 002: ID 0d8c:0104 C-Media Electronics, Inc. CM103+ Audio 
Controller
  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

  PCI Config:-
  00:00.0 Host bridge: Intel Corporation Device 3e10 (rev 07)
  00:02.0 VGA compatible controller: Intel Corporation Device 3e9b
  00:08.0 System peripheral: Intel Corporation Xeon E3-1200 v5/v6 / E3-1500 v5 
/ 6th/7th Gen Core Processor Gaussian Mixture Model
  00:12.0 Signal processing controller: Intel Corporation Cannon Lake PCH 
Thermal Controller (rev 10)
  00:14.0 USB controller: Intel Corporation Cannon Lake PCH USB 3.1 xHCI Host 
Controller (rev 10)
  00:14.2 RAM memory: Intel Corporation Cannon Lake PCH Shared SRAM (rev 10)
  00:16.0 Communication controller: Intel Corporation Cannon Lake PCH HECI 
Controller (rev 10)
  00:17.0 SATA controller: Intel Corporation Device a353 (rev 10)
  00:1d.0 PCI bridge: Intel Corporation Cannon Lake PCH PCI Express Root Port 9 
(rev f0)
  00:1d.5 PCI bridge: Intel Corporation Device a335 (rev f0)
  00:1d.6 PCI bridge: Intel Corporation Device a336 (rev f0)
  00:1f.0 ISA bridge: Intel Corporation Device a30d (rev 10)
  00:1f.3 Audio device: Intel Corporation Cannon Lake PCH cAVS (rev 10)
  00:1f.4 SMBus: Intel Corporation Cannon Lake PCH SMBus Controller (rev 10)
  00:1f.5 Serial bus controller [0c80]: Intel Corporation Cannon Lake PCH SPI 
Controller (rev 10)
  01:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD 
Controller SM981/PM981
  02:00.0 Network controller: Intel Corporation Wireless 3160 (rev 93)
  03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTL8411B PCI 
Express Card Reader (rev 01)
  03:00.1 Ethernet controller: Realtek Semiconductor Co., Ltd. 
RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 12)

  This has only started happening since using 4.15.0-151. Reverting to
  4.15.0-147 makes the system stable.

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