Comment 4 for bug 1731031

[ 305.778878] BUG: unable to handle kernel paging request at fffff9cafc000020
[ 305.778915] IP: kfree+0x53/0x160
[ 305.778924] PGD 0
[ 305.778924] P4D 0

[ 305.778939] Oops: 0000 [#1] SMP
[ 305.778948] Modules linked in: rfcomm cmac bnep binfmt_misc intel_spi_platform intel_spi spi_nor mtd joydev applesmc input_polldev intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec_hdmi pcbc snd_hda_codec_cirrus snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep aesni_intel snd_pcm aes_x86_64 crypto_simd glue_helper cryptd intel_cstate intel_rapl_perf wl(POE) snd_seq_midi btusb snd_seq_midi_event btrtl btbcm snd_rawmidi btintel lpc_ich bluetooth thunderbolt cfg80211 snd_seq bdc_pci ecdh_generic input_leds bcm5974 snd_seq_device snd_timer mei_me snd mei sbs shpchp soundcore acpi_als sbshc kfifo_buf industrialio apple_bl mac_hid parport_pc ppdev lp parport ip_tables x_tables autofs4
[ 305.779157] btrfs xor raid6_pq hid_generic hid_apple usbhid hid uas usb_storage i915 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt ahci fb_sys_fops libahci drm video
[ 305.779200] CPU: 3 PID: 777 Comm: cupsd Tainted: P OE 4.13.0-16-generic #19-Ubuntu
[ 305.779220] Hardware name: Apple Inc. MacBookPro11,1/Mac-189A3D4F975D5FFC, BIOS MBP111.88Z.0138.B17.1602221718 02/22/2016
[ 305.779243] task: ffff89855c6c1740 task.stack: ffffb207c1f68000
[ 305.779259] RIP: 0010:kfree+0x53/0x160
[ 305.779268] RSP: 0018:ffffb207c1f6bd30 EFLAGS: 00010286
[ 305.779281] RAX: 0000000000000000 RBX: 00000000000008d0 RCX: 0000000000000006
[ 305.779297] RDX: 0000488250a03468 RSI: 0000000000010080 RDI: 0000767e80000000
[ 305.779313] RBP: ffffb207c1f6bd48 R08: 000000000001f4c0 R09: ffffffff8f3b8819
[ 305.779328] R10: fffff9cafc000000 R11: 0000000001000000 R12: ffff898551025780
[ 305.779344] R13: ffffffff8efa123e R14: 0000000000000000 R15: ffff89851c80da80
[ 305.779361] FS: 00007fd593498040(0000) GS:ffff89856f380000(0000) knlGS:0000000000000000
[ 305.779379] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 305.779392] CR2: fffff9cafc000020 CR3: 000000045a604000 CR4: 00000000001406e0
[ 305.779408] Call Trace:
[ 305.779417] security_sk_free+0x3e/0x50
[ 305.779428] __sk_destruct+0x108/0x190
[ 305.779438] sk_destruct+0x20/0x30
[ 305.779448] __sk_free+0x82/0xa0
[ 305.779456] sk_free+0x19/0x20
[ 305.779466] tcp_close+0x232/0x3f0
[ 305.779476] inet_release+0x3c/0x60
[ 305.779486] inet6_release+0x30/0x40
[ 305.779497] sock_release+0x1f/0x80
[ 305.779506] sock_close+0x12/0x20
[ 305.779516] __fput+0xe7/0x220
[ 305.779524] ____fput+0xe/0x10
[ 305.779534] task_work_run+0x76/0x90
[ 305.779545] exit_to_usermode_loop+0xc4/0xd0
[ 305.779556] syscall_return_slowpath+0x59/0x60
[ 305.779568] entry_SYSCALL_64_fastpath+0xa7/0xa9
[ 305.779579] RIP: 0033:0x7fd591ce6db4
[ 305.779588] RSP: 002b:00007ffe68aaf0e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
[ 305.779605] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fd591ce6db4
[ 305.779621] RDX: 0000000000000000 RSI: 000000000000000d RDI: 000000000000000d
[ 305.779637] RBP: 00007fd591a99359 R08: 00007fd591a99359 R09: 00007fd591cd0a20
[ 305.779653] R10: 00007ffe68aaf0fc R11: 0000000000000246 R12: 000055986a5f4fbf
[ 305.779669] R13: 000055986a5f8c00 R14: 0000000000000001 R15: 0000000000000000
[ 305.779685] Code: 00 80 49 01 da 0f 82 1c 01 00 00 48 c7 c7 00 00 00 80 48 2b 3d f7 e7 c1 00 49 01 fa 49 c1 ea 0c 49 c1 e2 06 4c 03 15 d5 e7 c1 00 <49> 8b 42 20 48 8d 50 ff a8 01 4c 0f 45 d2 49 8b 52 20 48 8d 42
[ 305.779742] RIP: kfree+0x53/0x160 RSP: ffffb207c1f6bd30
[ 305.779754] CR2: fffff9cafc000020
[ 305.791322] ---[ end trace 0524052293a91be8 ]---
[ 305.793377] BUG: unable to handle kernel paging request at fffff9d1b0000020
[ 305.793419] IP: kfree+0x53/0x160
[ 305.793429] PGD 0
[ 305.793430] P4D 0

[ 305.793449] Oops: 0000 [#2] SMP
[ 305.793459] Modules linked in: rfcomm cmac bnep binfmt_misc intel_spi_platform intel_spi spi_nor mtd joydev applesmc input_polldev intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec_hdmi pcbc snd_hda_codec_cirrus snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep aesni_intel snd_pcm aes_x86_64 crypto_simd glue_helper cryptd intel_cstate intel_rapl_perf wl(POE) snd_seq_midi btusb snd_seq_midi_event btrtl btbcm snd_rawmidi btintel lpc_ich bluetooth thunderbolt cfg80211 snd_seq bdc_pci ecdh_generic input_leds bcm5974 snd_seq_device snd_timer mei_me snd mei sbs shpchp soundcore acpi_als sbshc kfifo_buf industrialio apple_bl mac_hid parport_pc ppdev lp parport ip_tables x_tables autofs4
[ 305.793676] btrfs xor raid6_pq hid_generic hid_apple usbhid hid uas usb_storage i915 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt ahci fb_sys_fops libahci drm video
[ 305.793731] CPU: 2 PID: 777 Comm: cupsd Tainted: P D OE 4.13.0-16-generic #19-Ubuntu
[ 305.793753] Hardware name: Apple Inc. MacBookPro11,1/Mac-189A3D4F975D5FFC, BIOS MBP111.88Z.0138.B17.1602221718 02/22/2016
[ 305.793780] task: ffff89855c6c1740 task.stack: ffffb207c1f68000
[ 305.793798] RIP: 0010:kfree+0x53/0x160
[ 305.793808] RSP: 0018:ffffb207c1f6bcd0 EFLAGS: 00010286
[ 305.793823] RAX: 0000000000000000 RBX: 000001ad00000002 RCX: ffff898552ad0e20
[ 305.793841] RDX: 0000488250a03468 RSI: 0000000000010080 RDI: 0000767e80000000
[ 305.793859] RBP: ffffb207c1f6bce8 R08: 000000000001f4c0 R09: 0000000000000101
[ 305.793877] R10: fffff9d1b0000000 R11: 0000000000000000 R12: ffff898551023480
[ 305.793895] R13: ffffffff8efa123e R14: ffff8985588daf40 R15: ffff89855443cd68
[ 305.793913] FS: 00007fd593498040(0000) GS:ffff89856f300000(0000) knlGS:0000000000000000
[ 305.793933] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 305.793948] CR2: fffff9d1b0000020 CR3: 0000000314409000 CR4: 00000000001406e0
[ 305.793965] Call Trace:
[ 305.793976] security_sk_free+0x3e/0x50
[ 305.793988] __sk_destruct+0x108/0x190
[ 305.793999] sk_destruct+0x20/0x30
[ 305.794008] __sk_free+0x82/0xa0
[ 305.794018] sk_free+0x19/0x20
[ 305.794028] inet_csk_listen_stop+0xc2/0x1c0
[ 305.794040] tcp_close+0x2b8/0x3f0
[ 305.794051] inet_release+0x3c/0x60
[ 305.794061] inet6_release+0x30/0x40
[ 305.794073] sock_release+0x1f/0x80
[ 305.794083] sock_close+0x12/0x20
[ 305.794093] __fput+0xe7/0x220
[ 305.794102] ____fput+0xe/0x10
[ 305.794113] task_work_run+0x76/0x90
[ 305.794124] do_exit+0x2e0/0xaf0
[ 305.794142] ? exit_to_usermode_loop+0xc4/0xd0
[ 305.794161] rewind_stack_do_exit+0x17/0x20
[ 305.794173] RIP: 0033:0x7fd591ce6db4
[ 305.794182] RSP: 002b:00007ffe68aaf0e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
[ 305.794201] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fd591ce6db4
[ 305.794219] RDX: 0000000000000000 RSI: 000000000000000d RDI: 000000000000000d
[ 305.794236] RBP: 00007fd591a99359 R08: 00007fd591a99359 R09: 00007fd591cd0a20
[ 305.794254] R10: 00007ffe68aaf0fc R11: 0000000000000246 R12: 000055986a5f4fbf
[ 305.794271] R13: 000055986a5f8c00 R14: 0000000000000001 R15: 0000000000000000
[ 305.794289] Code: 00 80 49 01 da 0f 82 1c 01 00 00 48 c7 c7 00 00 00 80 48 2b 3d f7 e7 c1 00 49 01 fa 49 c1 ea 0c 49 c1 e2 06 4c 03 15 d5 e7 c1 00 <49> 8b 42 20 48 8d 50 ff a8 01 4c 0f 45 d2 49 8b 52 20 48 8d 42
[ 305.794352] RIP: kfree+0x53/0x160 RSP: ffffb207c1f6bcd0
[ 305.795901] CR2: fffff9d1b0000020
[ 305.797429] ---[ end trace 0524052293a91be9 ]---
[ 305.797430] Fixing recursive fault but reboot is needed!