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Message #05345
[Bug 2078790] Re: jammy qemu x86 int3: 0000 [#1] SMP NOPTI
jammy:linux-lowlatency-hwe-6.8 6.8.0-44.44.1~22.04.1 qemu-x86 QEMU
Standard PC (i440FX + PIIX, 1996) -> ADT:systemd:upstream-1
2564s --x-- Running TEST-13-NSPAWN-SMOKE --x--
2564s make: Entering directory '/tmp/autopkgtest.Nji8tC/build.UBO/src/test/TEST-13-NSPAWN-SMOKE'
2564s Specify build directory with $BUILD_DIR
2565s TEST-13-NSPAWN-SMOKE SETUP: systemd-nspawn smoke test
2565s '/tmp/autopkgtest.Nji8tC/build.UBO/src/test/default.img' -> '/tmp/autopkgtest.Nji8tC/build.UBO/src/test/TEST-13-NSPAWN-SMOKE/../nspawn.img'
2565s Reusing existing cached image /tmp/autopkgtest.Nji8tC/build.UBO/src/test/TEST-13-NSPAWN-SMOKE/../nspawn.img → /tmp/autopkgtest.Nji8tC/build.UBO/src/test/nspawn.img
2565s '/tmp/autopkgtest.Nji8tC/build.UBO/src/test/nspawn.img' -> '/var/tmp/systemd-test.RZ0EoL/nspawn.img'
2566s I: Masking supporting services
2566s '/var/tmp/systemd-test.RZ0EoL/root/etc/systemd/system/systemd-hwdb-update.service' -> '/dev/null'
2566s '/var/tmp/systemd-test.RZ0EoL/root/etc/systemd/system/systemd-journal-catalog-update.service' -> '/dev/null'
2566s '/var/tmp/systemd-test.RZ0EoL/root/etc/systemd/system/systemd-networkd.service' -> '/dev/null'
2566s '/var/tmp/systemd-test.RZ0EoL/root/etc/systemd/system/systemd-networkd.socket' -> '/dev/null'
2566s '/var/tmp/systemd-test.RZ0EoL/root/etc/systemd/system/systemd-resolved.service' -> '/dev/null'
2566s Specify build directory with $BUILD_DIR
2566s TEST-13-NSPAWN-SMOKE RUN: systemd-nspawn smoke test
2566s + /bin/qemu-system-x86_64 -smp 4 -net none -m 512M -nographic -vga none -kernel /boot/vmlinuz-6.8.0-44-lowlatency -drive format=raw,cache=unsafe,file=/var/tmp/systemd-test.RZ0EoL/nspawn.img -initrd /boot/initrd.img-6.8.0-44-lowlatency -append 'root=/dev/sda1 rw raid=noautodetect rd.luks=0 loglevel=2 init=/lib/systemd/systemd console=ttyS0 selinux=0 SYSTEMD_UNIT_PATH=/usr/lib/systemd/tests/testdata/testsuite-13.units:/usr/lib/systemd/tests/testdata/units: systemd.unit=testsuite.target systemd.wants=testsuite-13.service systemd.wants=end.service'
2566s c[?7l[2J[0mSeaBIOS (version 1.15.0-1)
2576s Booting from ROM..c[?7l[2JLoading, please wait...
2577s Starting version 249.11-0ubuntu3.12
2579s Begin: Loading essential drivers ... done.
2579s Begin: Running /scripts/init-premount ... done.
2579s Begin: Mounting root file system ... Begin: Running /scripts/local-top ... done.
2580s Begin: Running /scripts/local-premount ... Scanning for Btrfs filesystems
2580s done.
2580s Begin: Will now check root file system ... fsck from util-linux 2.37.2
2580s [/usr/sbin/fsck.ext4 (1) -- /dev/sda1] fsck.ext4 -a -C0 /dev/sda1
2580s systemd: clean, 2426/115200 files, 47727/115200 blocks
2580s done.
2580s done.
2581s Begin: Running /scripts/local-bottom ... done.
2581s Begin: Running /scripts/init-bottom ... done.
2582s
2582s Welcome to [1mUbuntu 22.04.4 LTS[0m!
2582s
2583s [[0;32m OK [0m] Created slice [0;1;39mSlice /system/modprobe[0m.
2583s [[0;32m OK [0m] Created slice [0;1;39mSlice /system/serial-getty[0m.
2583s [[0;32m OK [0m] Created slice [0;1;39mUser and Session Slice[0m.
2583s [[0;32m OK [0m] Started [0;1;39mDispatch Password …ts to Console Directory Watch[0m.
2583s [[0;32m OK [0m] Started [0;1;39mForward Password R…uests to Wall Directory Watch[0m.
2583s [[0;1;38;5;185mUNSUPP[0m] Starting of [0;1;39mArbitrary Exec…m Automount Point[0m unsupported.
2583s [[0;32m OK [0m] Reached target [0;1;39mLocal Encrypted Volumes[0m.
2583s [[0;32m OK [0m] Reached target [0;1;39mPath Units[0m.
2583s [[0;32m OK [0m] Reached target [0;1;39mSlice Units[0m.
2583s [[0;32m OK [0m] Reached target [0;1;39mSwaps[0m.
2583s [[0;32m OK [0m] Reached target [0;1;39mLocal Verity Protected Volumes[0m.
2583s [[0;32m OK [0m] Listening on [0;1;39mProcess Core Dump Socket[0m.
2583s [[0;32m OK [0m] Listening on [0;1;39minitctl Compatibility Named Pipe[0m.
2583s [[0;32m OK [0m] Listening on [0;1;39mJournal Audit Socket[0m.
2583s [[0;32m OK [0m] Listening on [0;1;39mJournal Socket (/dev/log)[0m.
2583s [[0;32m OK [0m] Listening on [0;1;39mJournal Socket[0m.
2583s [[0;32m OK [0m] Listening on [0;1;39mudev Control Socket[0m.
2583s [[0;32m OK [0m] Listening on [0;1;39mudev Kernel Socket[0m.
2583s [[0;32m OK [0m] Reached target [0;1;39mSockets[0m.
2583s Mounting [0;1;39mHuge Pages File System[0m...
2583s Mounting [0;1;39mPOSIX Message Queue File System[0m...
2583s Mounting [0;1;39mKernel Debug File System[0m...
2583s Mounting [0;1;39mKernel Trace File System[0m...
2583s Starting [0;1;39mJournal Service[0m...
2583s Starting [0;1;39mLoad Kernel Module configfs[0m...
2583s Starting [0;1;39mLoad Kernel Module drm[0m...
2583s Starting [0;1;39mLoad Kernel Module fuse[0m...
2583s Starting [0;1;39mLoad Kernel Modules[0m...
2584s Starting [0;1;39mRemount Root and Kernel File Systems[0m...
2584s Starting [0;1;39mColdplug All udev Devices[0m...
2584s [[0;32m OK [0m] Mounted [0;1;39mHuge Pages File System[0m.
2584s [[0;32m OK [0m] Mounted [0;1;39mPOSIX Message Queue File System[0m.
2584s [[0;32m OK [0m] Mounted [0;1;39mKernel Debug File System[0m.
2584s [[0;32m OK [0m] Mounted [0;1;39mKernel Trace File System[0m.
2584s [[0;32m OK [0m] Finished [0;1;39mLoad Kernel Module configfs[0m.
2584s [[0;32m OK [0m] Finished [0;1;39mLoad Kernel Module drm[0m.
2584s [[0;32m OK [0m] Finished [0;1;39mLoad Kernel Module fuse[0m.
2584s [[0;32m OK [0m] Finished [0;1;39mLoad Kernel Modules[0m.
2584s [[0;32m OK [0m] Finished [0;1;39mRemount Root and Kernel File Systems[0m.
2584s Mounting [0;1;39mFUSE Control File System[0m...
2584s Mounting [0;1;39mKernel Configuration File System[0m...
2584s Starting [0;1;39mLoad/Save Random Seed[0m...
2584s Starting [0;1;39mApply Kernel Variables[0m...
2584s Starting [0;1;39mCreate System Users[0m...
2584s [[0;32m OK [0m] Mounted [0;1;39mFUSE Control File System[0m.
2584s [[0;32m OK [0m] Started [0;1;39mJournal Service[0m.
2584s [[0;32m OK [0m] Mounted [0;1;39mKernel Configuration File System[0m.
2584s Starting [0;1;39mFlush Journal to Persistent Storage[0m...
2584s [[0;32m OK [0m] Finished [0;1;39mLoad/Save Random Seed[0m.
2584s [[0;32m OK [0m] Finished [0;1;39mApply Kernel Variables[0m.
2584s [[0;32m OK [0m] Finished [0;1;39mCreate System Users[0m.
2584s Starting [0;1;39mCreate Static Device Nodes in /dev[0m...
2584s [[0;32m OK [0m] Finished [0;1;39mFlush Journal to Persistent Storage[0m.
2584s [[0;32m OK [0m] Finished [0;1;39mCreate Static Device Nodes in /dev[0m.
2584s [[0;32m OK [0m] Reached target [0;1;39mPreparation for Local File Systems[0m.
2584s [[0;32m OK [0m] Reached target [0;1;39mLocal File Systems[0m.
2584s Starting [0;1;39mCreate Volatile Files and Directories[0m...
2584s Starting [0;1;39mRule-based Manage…for Device Events and Files[0m...
2585s [[0;32m OK [0m] Finished [0;1;39mColdplug All udev Devices[0m.
2585s [[0;32m OK [0m] Finished [0;1;39mCreate Volatile Files and Directories[0m.
2585s Starting [0;1;39mRecord System Boot/Shutdown in UTMP[0m...
2585s [[0;32m OK [0m] Finished [0;1;39mRecord System Boot/Shutdown in UTMP[0m.
2585s [[0;32m OK [0m] Started [0;1;39mRule-based Manager for Device Events and Files[0m.
2585s [[0;32m OK [0m] Reached target [0;1;39mSystem Initialization[0m.
2585s [[0;32m OK [0m] Started [0;1;39mDaily Cleanup of Temporary Directories[0m.
2585s [[0;32m OK [0m] Reached target [0;1;39mBasic System[0m.
2585s [[0;32m OK [0m] Reached target [0;1;39mTimers[0m.
2585s [[0;32m OK [0m] Listening on [0;1;39mD-Bus System Message Bus Socket[0m.
2585s Starting [0;1;39m/etc/rc.local Compatibility[0m...
2585s Starting [0;1;39mUser Login Management[0m...
2585s [ 16.813561] rc.local[255]: /etc/rc.local: 2: iptables: not found
2585s Starting [0;1;39mPermit User Sessions[0m...
2585s Starting [0;1;39mTEST-13-NSPAWN-SMOKE[0m...
2585s [[0;32m OK [0m] Started [0;1;39m/etc/rc.local Compatibility[0m.
2585s [[0;32m OK [0m] Finished [0;1;39mPermit User Sessions[0m.
2586s [[0;32m OK [0m] Started [0;1;39mD-Bus System Message Bus[0m.
2586s [[0;32m OK [0m] Started [0;1;39mUser Login Management[0m.
2588s [[0;32m OK [0m] Found device [0;1;39m/dev/ttyS0[0m.
2588s [[0;32m OK [0m] Created slice [0;1;39mVirtual Machine and Container Slice[0m.
2588s [[0;32m OK [0m] Started [0;1;39mContainer testsuite-13.bind-tmp-path[0m.
2588s [[0;32m OK [0m] Listening on [0;1;39mLoad/Save RF …itch Status /dev/rfkill Watch[0m.
2588s [[0;32m OK [0m] Started [0;1;39mSerial Getty on ttyS0[0m.
2588s [[0;32m OK [0m] Reached target [0;1;39mLogin Prompts[0m.
2588s [[0;32m OK [0m] Reached target [0;1;39mMulti-User System[0m.
2588s Starting [0;1;39mRecord Runlevel Change in UTMP[0m...
2588s [[0;32m OK [0m] Finished [0;1;39mRecord Runlevel Change in UTMP[0m.
2589s Starting [0;1;39mVirtual Machine a…tainer Registration Service[0m...
2589s [[0;32m OK [0m] Started [0;1;39mVirtual Machine an…ontainer Registration Service[0m.
2590s [[0;32m OK [0m] Started [0;1;39mContainer testsuite-13.norbind-path[0m.
2591s [[0;32m OK [0m] Started [0;1;39mContainer testsuite-13.nc-container[0m.
2594s
2607s H login: [ 39.204860] int3: 0000 [#1] PREEMPT SMP NOPTI
2607s [ 39.204860] CPU: 2 PID: 538 Comm: ip Not tainted 6.8.0-44-lowlatency #44.1~22.04.1-Ubuntu
2607s [ 39.204860] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
2607s [ 39.204860] RIP: 0010:get_any_partial+0x5f/0x1d0
2607s [ 39.204860] Code: 2d 01 00 00 83 e6 0f b8 22 01 32 01 49 89 fd 8d 0c 36 d3 f8 89 c1 65 48 8b 04 25 40 43 03 00 48 89 45 c8 83 e1 03 41 89 ce 0f <1f> 44 00 00 c7 45 d4 00 00 00 00 41 8b 1c 24 e8 9d af 02 00 c1 eb
2607s [ 39.204860] RSP: 0018:ffffad70c0a7b878 EFLAGS: 00000202
2607s [ 39.204860] RAX: ffff904994a2cf00 RBX: ffffad70c0a7b8e0 RCX: 0000000000000002
2607s [ 39.204860] RDX: 0000000000000017 RSI: 0000000000000000 RDI: ffff904981054600
2607s [ 39.204860] RBP: ffffad70c0a7b8b0 R08: 00000000ffffffff R09: 0000000000000246
2607s [ 39.204860] R10: 0000000000000246 R11: 0000000000000000 R12: ffffad70c0a7b8e0
2607s [ 39.204860] R13: ffff904981054600 R14: 0000000000000002 R15: ffff904981054600
2607s [ 39.204860] FS: 00007e585fc45b80(0000) GS:ffff90499b100000(0000) knlGS:0000000000000000
2607s [ 39.204860] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
2607s [ 39.204860] CR2: 00007ffe6da69e88 CR3: 0000000003d84000 CR4: 00000000000006f0
2607s [ 39.204860] Call Trace:
2607s [ 39.204860] <TASK>
2607s [ 39.204860] ? show_regs+0x6d/0x80
2607s [ 39.204860] ? die+0x37/0xa0
2607s [ 39.204860] ? exc_int3+0xe2/0xf0
2607s [ 39.204860] ? asm_exc_int3+0x3a/0x40
2607s [ 39.204860] ? get_any_partial+0x5f/0x1d0
2607s [ 39.204860] ? get_any_partial+0x5f/0x1d0
2607s [ 39.204860] ? namecmp+0x26/0x40
2607s [ 39.204860] ___slab_alloc+0x735/0x8d0
2607s [ 39.204860] ? __mod_memcg_lruvec_state+0xa9/0x1b0
2607s [ 39.204860] ? __register_sysctl_table+0x3f/0x180
2607s [ 39.204860] ? mod_memcg_lruvec_state+0x2b/0x60
2607s [ 39.204860] ? __register_sysctl_table+0x3f/0x180
2607s [ 39.204860] __kmalloc+0x3e7/0x480
2607s [ 39.204860] ? string+0x5e/0x110
2607s [ 39.204860] __register_sysctl_table+0x3f/0x180
2607s [ 39.204860] ? __register_sysctl_table+0x3f/0x180
2607s [ 39.204860] register_net_sysctl_sz+0x62/0x80
2607s [ 39.204860] __devinet_sysctl_register+0x109/0x220
2607s [ 39.204860] devinet_sysctl_register+0x9c/0xd0
2607s [ 39.204860] inetdev_init+0xee/0x200
2607s [ 39.204860] inetdev_event+0x32d/0x3f0
2607s [ 39.204860] notifier_call_chain+0x61/0xe0
2607s [ 39.204860] raw_notifier_call_chain+0x16/0x30
2607s [ 39.204860] call_netdevice_notifiers_info+0x52/0xa0
2607s [ 39.204860] register_netdevice+0x716/0x8d0
2607s [ 39.204860] register_netdev+0x1e/0x40
2607s [ 39.204860] loopback_net_init+0x50/0xb0
2607s [ 39.204860] ops_init+0x3c/0xe0
2607s [ 39.204860] setup_net+0x12e/0x2a0
2607s [ 39.204860] copy_net_ns+0x13d/0x2b0
2607s [ 39.204860] create_new_namespaces+0x11c/0x300
2607s [ 39.204860] unshare_nsproxy_namespaces+0x5a/0xc0
2607s [ 39.204860] ksys_unshare+0x1fc/0x3e0
2607s [ 39.204860] __x64_sys_unshare+0x12/0x20
2607s [ 39.204860] x64_sys_call+0xd8a/0x24b0
2607s [ 39.204860] do_syscall_64+0x81/0x170
2607s [ 39.204860] ? syscall_exit_to_user_mode+0x89/0x260
2607s [ 39.204860] ? do_syscall_64+0x8d/0x170
2607s [ 39.204860] ? do_syscall_64+0x8d/0x170
2607s [ 39.204860] ? irqentry_exit+0x43/0x50
2607s [ 39.204860] entry_SYSCALL_64_after_hwframe+0x78/0x80
2607s [ 39.204860] RIP: 0033:0x7e585fb26e1b
2607s [ 39.204860] Code: 73 01 c3 48 8b 0d 15 30 0f 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e5 2f 0f 00 f7 d8 64 89 01 48
2607s [ 39.204860] RSP: 002b:00007ffe6da6a668 EFLAGS: 00000217 ORIG_RAX: 0000000000000110
2607s [ 39.204860] RAX: ffffffffffffffda RBX: 0000628519178fcb RCX: 00007e585fb26e1b
2607s [ 39.204860] RDX: 0000000000000000 RSI: 00006285191740bf RDI: 0000000040000000
2607s [ 39.204860] RBP: 0000000000000005 R08: 0000000000000000 R09: 00007ffe6da6a4f0
2607s [ 39.204860] R10: 0000000000000000 R11: 0000000000000217 R12: 0000628519173bea
2607s [ 39.204860] R13: 0000000000000000 R14: 00007ffe6da6c880 R15: 0000628519175efe
2607s [ 39.204860] </TASK>
2607s [ 39.204860] Modules linked in: btrfs blake2b_generic xor raid6_pq libcrc32c psmouse i2c_piix4 pata_acpi floppy
2607s [ 39.204860] ---[ end trace 0000000000000000 ]---
2607s [ 39.204860] RIP: 0010:get_any_partial+0x5f/0x1d0
2607s [ 39.204860] Code: 2d 01 00 00 83 e6 0f b8 22 01 32 01 49 89 fd 8d 0c 36 d3 f8 89 c1 65 48 8b 04 25 40 43 03 00 48 89 45 c8 83 e1 03 41 89 ce 0f <1f> 44 00 00 c7 45 d4 00 00 00 00 41 8b 1c 24 e8 9d af 02 00 c1 eb
2607s [ 39.204860] RSP: 0018:ffffad70c0a7b878 EFLAGS: 00000202
2607s [ 39.204860] RAX: ffff904994a2cf00 RBX: ffffad70c0a7b8e0 RCX: 0000000000000002
2607s [ 39.204860] RDX: 0000000000000017 RSI: 0000000000000000 RDI: ffff904981054600
2607s [ 39.204860] RBP: ffffad70c0a7b8b0 R08: 00000000ffffffff R09: 0000000000000246
2607s [ 39.204860] R10: 0000000000000246 R11: 0000000000000000 R12: ffffad70c0a7b8e0
2607s [ 39.204860] R13: ffff904981054600 R14: 0000000000000002 R15: ffff904981054600
2607s [ 39.204860] FS: 00007e585fc45b80(0000) GS:ffff90499b100000(0000) knlGS:0000000000000000
2607s [ 39.204860] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
2607s [ 39.204860] CR2: 00007ffe6da69e88 CR3: 0000000003d84000 CR4: 00000000000006f0
2607s [ 39.204860] Kernel panic - not syncing: Fatal exception in interrupt
2607s [ 39.204860] Kernel Offset: 0x11c00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
2607s [ 39.204860] ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---
22327s autopkgtest [14:32:03]: ERROR: timed out on command "su -s /bin/bash root -c set -e; exec /tmp/autopkgtest.Nji8tC/wrapper.sh --artifacts=/tmp/autopkgtest.Nji8tC/upstream-1-artifacts --chdir=/tmp/autopkgtest.Nji8tC/build.UBO/src --env=AUTOPKGTEST_TESTBED_ARCH=amd64 --env=AUTOPKGTEST_TEST_ARCH=amd64 --env=DEB_BUILD_OPTIONS=parallel=4 --env=DEBIAN_FRONTEND=noninteractive --env=LANG=C.UTF-8 --unset-env=LANGUAGE --unset-env=LC_ADDRESS --unset-env=LC_ALL --unset-env=LC_COLLATE --unset-env=LC_CTYPE --unset-env=LC_IDENTIFICATION --unset-env=LC_MEASUREMENT --unset-env=LC_MESSAGES --unset-env=LC_MONETARY --unset-env=LC_NAME --unset-env=LC_NUMERIC --unset-env=LC_PAPER --unset-env=LC_TELEPHONE --unset-env=LC_TIME --script-pid-file=/tmp/autopkgtest_script_pid --source-profile --stderr=/tmp/autopkgtest.Nji8tC/upstream-1-stderr --stdout=/tmp/autopkgtest.Nji8tC/upstream-1-stdout --tmp=/tmp/autopkgtest.Nji8tC/autopkgtest_tmp --env=AUTOPKGTEST_NORMAL_USER=ubuntu --env=ADT_NORMAL_USER=ubuntu '--env=ADT_TEST_TRIGGERS=linux-meta-lowlatency-hwe-6.8/6.8.0-44.44.1~22.04.1 linux-lowlatency-hwe-6.8/6.8.0-44.44.1~22.04.1' --make-executable=/tmp/autopkgtest.Nji8tC/build.UBO/src/debian/tests/upstream-1 -- /tmp/autopkgtest.Nji8tC/build.UBO/src/debian/tests/upstream-1" (kind: test)
22328s autopkgtest [14:32:04]: test upstream-1: -----------------------]
22328s autopkgtest [14:32:04]: test upstream-1: - - - - - - - - - - results - - - - - - - - - -
22328s upstream-1 FAIL timed out
22330s autopkgtest [14:32:06]: test upstream-2: preparing testbed
** Project changed: ubuntu-kernel-tests => qemu
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Package changed: linux (Ubuntu) => linux-lowlatency-hwe-6.8 (Ubuntu)
** Changed in: linux-lowlatency-hwe-6.8 (Ubuntu)
Assignee: (unassigned) => Mehmet Basaran (mehmetbasaran)
--
You received this bug notification because you are a member of Canonical
Platform QA Team, which is subscribed to ubuntu-kernel-tests.
https://bugs.launchpad.net/bugs/2078790
Title:
jammy qemu x86 int3: 0000 [#1] SMP NOPTI
Status in linux-lowlatency-hwe-6.8 package in Ubuntu:
New
Status in qemu package in Ubuntu:
New
Bug description:
jammy:linux-lowlatency-hwe-6.8 6.8.0-44.44.1~22.04.1 qemu-x86 QEMU
Standard PC (i440FX + PIIX, 1996)
Recently (2024.08.05), I have been seeing this issue with ADT:systemd:upstream-1/2 test in which kernel panics/prints a stack. I have seen this with jammy:linux-lowlatency-hwe-6.8 and jammy:linux-ibm-6.8. Stack trace is different everytime because kernel receives an interrupt, drop what it is doing, and crash when handling the interrupt.
I think this is an issue with qemu and not kernel. For jammy, we are
using qemu 6.2 and there are some fixes related to x86 interrupt
handling in 8.x
(https://lore.kernel.org/lkml/20230705215008.GD17440@xxxxxxxxxx/T/). I
propose we create a launchpad bug and trace the issue. If I am
correct, we shouldn't see this in noble. And we should occasionally
see this in 5.15 jammy kernels (and more frequently with lowlantecy
kernels).
Meanwhile see comments below for some stack traces;
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-lowlatency-hwe-6.8/+bug/2078790/+subscriptions
References