@Julio, Can you open a new bug report, so we can investigate your issue further?
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1741934 Title: Kernel trace with xenial 4.4 (4.4.0-108.131, Candidate kernels for PTI fix) Status in linux package in Ubuntu: Fix Released Status in linux source package in Xenial: Fix Released Bug description: ### HOW TO BOOT INTO PREVIOUS KERNEL IF UNABLE TO BOOT ### If you hit this bug and are unable to boot, you can boot back into the last working kernel. To do that, select that version(Probably 4.4.0-104) from the GRUB menu. The GRUB menu can be accessed by holding the 'Shift' key after powering on the system(Some systems require the 'ESC' key to be held instead of Shift). Detailed information about GRUB can be found here: https://help.ubuntu.com/community/Grub2 [Description] When using PPA https://launchpad.net/~canonical-kernel- team/+archive/ubuntu/pti/ to fetch the candidate kernels for CVE-2017-5754, CVE-2017-5715 and CVE-2017-5753. There is the same kernel trace shown in many different pre-installed Ubuntu images of different platform. So far these platform are known to reproduce this issue: CID 201606-22340 (Dell Vostro 5468) CID 201606-22349 (Dell Inspiron 7560) CID 201606-22365 (Dell Inspiron 5767) [Steps to Reproduce] 1. Install the target pre-installed image (Xenial 4.4-based stack) for the platform. 2. Fetch the kernel 4.4.0-108.131 from this PPA https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/pti/ 3. Update the system by "sudo apt-get dist-upgrade" 4. After the system update, reboot it. 5. Check the syslog after the system is ready to use again. [Expected Result] No kernel trace message. [Actual Result] Kernel trace message as: Jan 9 00:33:33 201606-22365 kernel: [ 37.701226] ------------[ cut here ]------------ Jan 9 00:33:33 201606-22365 kernel: [ 37.701243] kernel BUG at /build/linux-J4_1pC/linux-4.4.0/mm/slub.c:3627! Jan 9 00:33:33 201606-22365 kernel: [ 37.701261] invalid opcode: 0000 [#1] SMP Jan 9 00:33:33 201606-22365 kernel: [ 37.701273] Modules linked in: nvram msr bnep rtsx_usb_ms memstick hid_multitouch uvcvideo i2c_designware_platform i2c_designware_core ath3k videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core v4l2_common videodev media btusb dell_wmi sparse_keymap btrtl snd_hda_codec_hdmi(OE) dell_led snd_hda_codec_realtek(OE) snd_hda_codec_generic(OE) dell_laptop dcdbas snd_hda_intel(OE) snd_hda_codec(OE) snd_hwdep dell_smm_hwmon intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp snd_soc_skl_ipc snd_hda_ext_core(OE) snd_hda_core(OE) snd_soc_sst_ipc snd_soc_sst_dsp snd_soc_core kvm_intel snd_compress kvm irqbypass ac97_bus crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_pcm_dmaengine aesni_intel snd_pcm aes_x86_64 snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq arc4 lrw ath9k ath9k_common snd_seq_device ath9k_hw gf128mul glue_helper snd_timer ath mac80211 cfg80211 hci_uart btbcm btqca btintel ablk_helper joydev input_leds cryptd serio_raw bluetooth snd mei_me soundcore mei tpm_crb shpchp idma64 dw_dmac_core virt_dma dell_rbtn int3403_thermal acpi_pad processor_thermal_device int3402_thermal int340x_thermal_zone int3400_thermal intel_soc_dts_iosf intel_lpss_acpi intel_lpss_pci acpi_thermal_rel intel_lpss mac_hid acpi_als kfifo_buf industrialio parport_pc ppdev lp parport autofs4 btrfs xor raid6_pq dm_mirror dm_region_hash dm_log mmc_block rtsx_usb_sdmmc rtsx_usb uas usb_storage i915_bpo intel_ips i2c_algo_bit drm_kms_helper psmouse syscopyarea sysfillrect sysimgblt fb_sys_fops r8169 drm ahci mii libahci wmi i2c_hid hid pinctrl_sunrisepoint video pinctrl_intel fjes Jan 9 00:33:33 201606-22365 kernel: [ 37.701735] CPU: 3 PID: 21 Comm: watchdog/3 Tainted: G OE 4.4.0-108-generic #131-Ubuntu Jan 9 00:33:33 201606-22365 kernel: [ 37.701756] Hardware name: Dell Inc. Inspiron 5767/ , BIOS 1.0.0 07/14/2016 Jan 9 00:33:33 201606-22365 kernel: [ 37.701774] task: ffff880169df6900 ti: ffff880169a1c000 task.ti: ffff880169a1c000 Jan 9 00:33:33 201606-22365 kernel: [ 37.701792] RIP: 0010:[<ffffffff811f00a7>] [<ffffffff811f00a7>] kfree+0x147/0x150 Jan 9 00:33:33 201606-22365 kernel: [ 37.701814] RSP: 0018:ffff880169a1fd58 EFLAGS: 00010246 Jan 9 00:33:33 201606-22365 kernel: [ 37.701827] RAX: ffffea0005bd0120 RBX: ffff88016f404840 RCX: ffff88016f7fa220 Jan 9 00:33:33 201606-22365 kernel: [ 37.701843] RDX: ffffea0005a64420 RSI: ffffea0005a64820 RDI: ffffea0005bd0100 Jan 9 00:33:33 201606-22365 kernel: [ 37.701860] RBP: ffff880169a1fd70 R08: 0000000000000009 R09: ff80003fffffffff Jan 9 00:33:33 201606-22365 kernel: [ 37.701877] R10: ffffea0005bd0100 R11: 0000000000000001 R12: 0000000000000000 Jan 9 00:33:33 201606-22365 kernel: [ 37.701893] R13: ffffffff810104ff R14: ffffffff81f3c840 R15: 0000000000000000 Jan 9 00:33:33 201606-22365 kernel: [ 37.701910] FS: 0000000000000000(0000) GS:ffff88016f580000(0000) knlGS:0000000000000000 Jan 9 00:33:33 201606-22365 kernel: [ 37.701929] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Jan 9 00:33:33 201606-22365 kernel: [ 37.701943] CR2: 0000557a57f940d0 CR3: 0000000002e0a000 CR4: 0000000000360670 Jan 9 00:33:33 201606-22365 kernel: [ 37.701961] Stack: Jan 9 00:33:33 201606-22365 kernel: [ 37.701966] 0000000000000000 0000000000000000 000000000000d440 ffff880169a1fda0 Jan 9 00:33:33 201606-22365 kernel: [ 37.701987] ffffffff810104ff 0000000000000004 0000000000000186 0000000000000003 Jan 9 00:33:33 201606-22365 kernel: [ 37.702007] 0000000000000003 ffff880169a1fdc0 ffffffff8100608f ffff880169a40000 Jan 9 00:33:33 201606-22365 kernel: [ 37.702027] Call Trace: Jan 9 00:33:33 201606-22365 kernel: [ 37.702036] [<ffffffff810104ff>] release_ds_buffers+0xbf/0xd0 Jan 9 00:33:33 201606-22365 kernel: [ 37.702052] [<ffffffff8100608f>] x86_release_hardware+0x8f/0xa0 Jan 9 00:33:33 201606-22365 kernel: [ 37.702067] [<ffffffff810060ae>] hw_perf_event_destroy+0xe/0x20 Jan 9 00:33:33 201606-22365 kernel: [ 37.702082] [<ffffffff81183746>] _free_event+0xb6/0x230 Jan 9 00:33:33 201606-22365 kernel: [ 37.702095] [<ffffffff81183983>] put_event+0xc3/0x100 Jan 9 00:33:33 201606-22365 kernel: [ 37.702108] [<ffffffff811839c9>] perf_event_release_kernel+0x9/0x10 Jan 9 00:33:33 201606-22365 kernel: [ 37.702125] [<ffffffff8113ccae>] watchdog_nmi_disable+0x4e/0x70 Jan 9 00:33:33 201606-22365 kernel: [ 37.702141] [<ffffffff810a4b00>] ? sort_range+0x30/0x30 Jan 9 00:33:33 201606-22365 kernel: [ 37.702154] [<ffffffff8113cd2c>] watchdog_disable+0x5c/0x80 Jan 9 00:33:33 201606-22365 kernel: [ 37.702169] [<ffffffff810a4be8>] smpboot_thread_fn+0xe8/0x160 Jan 9 00:33:33 201606-22365 kernel: [ 37.702184] [<ffffffff810a1845>] kthread+0xe5/0x100 Jan 9 00:33:33 201606-22365 kernel: [ 37.702196] [<ffffffff810a1760>] ? kthread_create_on_node+0x1e0/0x1e0 Jan 9 00:33:33 201606-22365 kernel: [ 37.702214] [<ffffffff81844a0f>] ret_from_fork+0x3f/0x70 Jan 9 00:33:33 201606-22365 kernel: [ 37.702228] [<ffffffff810a1760>] ? kthread_create_on_node+0x1e0/0x1e0 Jan 9 00:33:33 201606-22365 kernel: [ 37.702243] Code: 4c 89 d7 e8 9c 83 fa ff eb 8c 41 b8 01 00 00 00 48 89 d9 48 89 da 4c 89 d6 e8 06 fc ff ff e9 73 ff ff ff 49 8b 42 20 a8 01 75 c7 <0f> 0b 0f 1f 80 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 57 41 Jan 9 00:33:33 201606-22365 kernel: [ 37.702339] RIP [<ffffffff811f00a7>] kfree+0x147/0x150 Jan 9 00:33:33 201606-22365 kernel: [ 37.702354] RSP <ffff880169a1fd58> Jan 9 00:33:33 201606-22365 kernel: [ 37.706621] ---[ end trace ffe2cc0d7dbd1511 ]--- [More Information] - Similar kernel oops was found with 4.4.0-108.131~14.04.1 - Package info: ubuntu@201606-22365:~$ uname -a Linux 201606-22365 4.4.0-108-generic #131-Ubuntu SMP Sun Jan 7 14:34:49 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux ubuntu@201606-22365:~$ dpkg -l *4.4.0-108* Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Architecture Description +++-=============================================-===========================-===========================-=============================================================================================== ii linux-headers-4.4.0-108 4.4.0-108.131 all Header files related to Linux kernel version 4.4.0 ii linux-headers-4.4.0-108-generic 4.4.0-108.131 amd64 Linux kernel headers for version 4.4.0 on 64 bit x86 SMP ii linux-image-4.4.0-108-generic 4.4.0-108.131 amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP ii linux-image-extra-4.4.0-108-generic 4.4.0-108.131 amd64 Linux kernel extra modules for version 4.4.0 on 64 bit x86 SMP ii linux-signed-image-4.4.0-108-generic 4.4.0-108.131 amd64 Signed kernel image generic ii linux-tools-4.4.0-108 4.4.0-108.131 amd64 Linux kernel version specific tools for version 4.4.0-108 ii linux-tools-4.4.0-108-generic 4.4.0-108.131 amd64 Linux kernel version specific tools for version 4.4.0-108 ubuntu@201606-22365:~$ --- ApportVersion: 2.20.1-0ubuntu2.15 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: ubuntu 1829 F.... pulseaudio DistributionChannelDescriptor: # This is a distribution channel descriptor # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor canonical-oem-somerville-xenial-amd64-20160624-2 DistroRelease: Ubuntu 16.04 HibernationDevice: RESUME=UUID=5fe63e33-b771-4a7d-a00e-e1d4d3c541dc InstallationDate: Installed on 2018-01-08 (0 days ago) InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 20160624-10:47 MachineType: Dell Inc. Inspiron 7560 NonfreeKernelModules: nvidia_drm nvidia_modeset nvidia Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-108-generic.efi.signed root=UUID=4c76b3fe-0760-4b25-ae25-5fde1ea8f828 ro automatic-oem-config quiet splash ProcVersionSignature: Ubuntu 4.4.0-108.131-generic 4.4.98 RelatedPackageVersions: linux-restricted-modules-4.4.0-108-generic N/A linux-backports-modules-4.4.0-108-generic N/A linux-firmware 1.157.15 Tags: xenial Uname: Linux 4.4.0-108-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 07/18/2016 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.0.1 dmi.board.vendor: Dell Inc. dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.0.1:bd07/18/2016:svnDellInc.:pnInspiron7560:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct9:cvr: dmi.product.name: Inspiron 7560 dmi.sys.vendor: Dell Inc. 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