linux-image-5.8.0-36-generic seems fine, and all is working well again. Not sure if something was tweaked/fixed or if it is just serendipity, but all is well now.
-- 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/1909782 Title: kernel linux-image-5.8.0-33-generic crashes on boot with low memory corruption, Apple MacBookPro 2,1 Status in linux package in Ubuntu: Confirmed Bug description: booting Ubuntu 20.10 on Apple MacBookPro 2,1 with kernel 5.8.0-31-generic works properly. booting Ubuntu 20.10 on Apple MacBookPro 2,1 with kernel 5.8.0-33-generic crashes with error indicating low memory corruption. Release: 20.10 Dec 20 09:08:36 ken-macbookpro21 bluetoothd[739]: src/main.c:parse_controller_config() Key file does not have group “Controller” Dec 20 09:08:36 ken-macbookpro21 bluetoothd[739]: message repeated 27 times: [ src/main.c:parse_controller_config() Key file does not have group “Controller”] Dec 20 09:08:36 ken-macbookpro21 dbus-daemon[464]: dbus[464]: Unknown group "power" in message bus configuration file Dec 20 09:08:36 ken-macbookpro21 systemd[1]: Started CUPS Scheduler. Dec 20 09:08:37 ken-macbookpro21 systemd[1]: systemd-rfkill.service: Succeeded. Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400078] check: Corrupted low memory at 000000004f63a8a7 (1258 phys) = 82000000 Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400108] check: Corrupted low memory at 000000009e8bc546 (c248 phys) = 82000000 Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400118] ------------[ cut here ]------------ Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400120] Memory corruption detected in low memory Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400138] WARNING: CPU: 1 PID: 177 at arch/x86/kernel/check.c:161 check_for_bios_corruption+0xb1/0xc0 Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400139] Modules linked in: btusb btrtl btbcm btintel bluetooth ecdh_generic ecc joydev snd_hda_codec_idt snd_hda_codec_generic ledtrig_audio snd_hda_intel snd_intel_dspcfg radeon snd_hda_codec snd_hda_core ttm snd_hwdep drm_kms_helper snd_pcm snd_seq_midi cec ath9k rc_core appletouch snd_seq_midi_event ath9k_common applesmc ath9k_hw snd_rawmidi input_leds ath i2c_algo_bit snd_seq mac80211 fb_sys_fops coretemp apple_mfi_fastcharge syscopyarea kvm_intel snd_seq_device sysfillrect snd_timer cfg80211 sysimgblt snd kvm soundcore acpi_als kfifo_buf libarc4 industrialio sbs sbshc mac_hid apple_bl binfmt_misc sch_fq_codel parport_pc ppdev lp parport drm ip_tables x_tables autofs4 hid_appleir hid_apple hid_generic usbhid hid firewire_ohci firewire_core i2c_i801 i2c_smbus lpc_ich pata_acpi crc_itu_t sky2 video Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400223] CPU: 1 PID: 177 Comm: kworker/1:3 Not tainted 5.8.0-33-generic #36-Ubuntu Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400226] Hardware name: Apple Computer, Inc. MacBookPro2,1/Mac-F42189C8, BIOS MBP21.88Z.00A5.B08.0802291403 02/29/08 Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400232] Workqueue: events check_corruption Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400238] RIP: 0010:check_for_bios_corruption+0xb1/0xc0 Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400243] Code: 85 f6 75 0a 5b 41 5c 41 5d 41 5e 5d c3 c3 80 3d dc 3a bb 01 00 75 ed 48 c7 c7 f0 90 d9 98 c6 05 cc 3a bb 01 01 e8 94 7b 02 00 <0f> 0b eb d6 66 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 8b 15 Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400246] RSP: 0018:ffffb489c0207e48 EFLAGS: 00010286 Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400250] RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff97047bd18cd8 Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400253] RDX: 00000000ffffffd8 RSI: 0000000000000027 RDI: ffff97047bd18cd0 Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400256] RBP: ffffb489c0207e68 R08: 0000000000000001 R09: 00000000000003ac Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400258] R10: ffffffff999b69a8 R11: ffffb489c0207c90 R12: ffff9703c0010000 Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400261] R13: ffff9703c0010000 R14: 0000000080000000 R15: ffff970479bcd900 Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400265] FS: 0000000000000000(0000) GS:ffff97047bd00000(0000) knlGS:0000000000000000 Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400268] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400271] CR2: 00007f86e4b62748 CR3: 00000000b011e000 CR4: 00000000000006e0 Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400274] Call Trace: Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400284] check_corruption+0xe/0x3a Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400291] process_one_work+0x1e8/0x3b0 Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400295] worker_thread+0x50/0x370 Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400300] kthread+0x12f/0x150 Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400305] ? process_one_work+0x3b0/0x3b0 Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400309] ? __kthread_bind_mask+0x70/0x70 Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400315] ret_from_fork+0x22/0x30 Dec 20 09:08:40 ken-macbookpro21 kernel: [ 62.400320] ---[ end trace 5592cbdcb2b953b6 ]--- Dec 20 09:08:40 ken-macbookpro21 grub-common[469]: * Recording successful boot for GRUB Dec 20 09:08:40 ken-macbookpro21 apport[461]: * Starting automatic crash report generation: apport Dec 20 09:08:41 ken-macbookpro21 apport[461]: ...done. Dec 20 09:08:41 ken-macbookpro21 systemd[1]: Started LSB: automatic crash report generation. Dec 20 09:08:41 ken-macbookpro21 mono-xsp4[476]: * Starting XSP 4.0 WebServer mono-xsp4 --- ProblemType: Bug ApportVersion: 2.20.11-0ubuntu50.3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: cunningh 1069 F.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME DistroRelease: Ubuntu 20.10 InstallationDate: Installed on 2020-11-01 (59 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) MachineType: Apple Computer, Inc. MacBookPro2,1 Package: linux (not installed) ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-31-generic root=UUID=b293fe41-b105-4220-b563-0b4c9231b082 ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 5.8.0-31.33-generic 5.8.17 RelatedPackageVersions: linux-restricted-modules-5.8.0-31-generic N/A linux-backports-modules-5.8.0-31-generic N/A linux-firmware 1.190.2 Tags: groovy Uname: Linux 5.8.0-31-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 02/29/08 dmi.bios.release: 0.1 dmi.bios.vendor: Apple Inc. dmi.bios.version: MBP21.88Z.00A5.B08.0802291403 dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: Mac-F42189C8 dmi.board.vendor: Apple Computer, Inc. dmi.board.version: PVT dmi.chassis.asset.tag: Asset Tag dmi.chassis.type: 8 dmi.chassis.vendor: Apple Inc. dmi.chassis.version: Mac-F42189C8 dmi.modalias: dmi:bvnAppleInc.:bvrMBP21.88Z.00A5.B08.0802291403:bd02/29/08:br0.1:svnAppleComputer,Inc.:pnMacBookPro2,1:pvr1.0:rvnAppleComputer,Inc.:rnMac-F42189C8:rvrPVT:cvnAppleInc.:ct8:cvrMac-F42189C8: dmi.product.family: MacBook Pro dmi.product.name: MacBookPro2,1 dmi.product.sku: System SKUNumber dmi.product.version: 1.0 dmi.sys.vendor: Apple Computer, Inc. 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