The backtrace unfortunately doesn't provide any information that points to how this could be a systemd problem. The crashing thread appears to be:
Thread 12 (Thread 0x7f50a9f2e640 (LWP 282533) "ThreadPoolServi"): #1 0x00007f50de277845 in buffered_vfprintf (s=0x7f50de41a6a0 <_IO_2_1_stderr_>, format=format@entry=0x7f50c74e8c85 "[%s] %s\n", args=args@entry=0x7f50a9f1c1e0, mode_flags=mode_flags@entry=2) at ./stdio-common/vfprintf-internal.c:2265 #2 0x00007f50de2766de in __vfprintf_internal (s=<optimized out>, format=0x7f50c74e8c85 "[%s] %s\n", ap=ap@entry=0x7f50a9f1c1e0, mode_flags=2) at ./stdio-common/vfprintf-internal.c:1236 #3 0x00007f50de334ec3 in ___fprintf_chk (fp=<optimized out>, flag=<optimized out>, format=<optimized out>) at ./debug/fprintf_chk.c:33 #4 0x00007f50c74cd37e in event_logv_ () at /lib/x86_64-linux-gnu/libevent-2.1.so.7 #5 0x00007f50c74cd549 in event_warn () at /lib/x86_64-linux-gnu/libevent-2.1.so.7 #6 0x00007f50c74d223c in () at /lib/x86_64-linux-gnu/libevent-2.1.so.7 #7 0x00007f50c74c95d1 in event_base_loop () at /lib/x86_64-linux-gnu/libevent-2.1.so.7 #8 0x00007f50d357c624 in () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5 since we don't see the format string arguments, this doesn't tell us what's being printed that's a problem or how it could be systemd- related. I'm attaching the /lib/udev/rules.d/60-persistent-storage.rules from the previous version of systemd, 249.11-0ubuntu3.9. Since this is the only change in the new version affecting udev, even though we don't see how it would break your devices, we should test whether reverting this fixes your problem. Please download the attached file and run the following commands: sudo cp -a /lib/udev/rules.d/60-persistent-storage.rules{,.bak} sudo mv 60-persistent-storage.rules /lib/udev/rules.d/60-persistent-storage.rules Then reboot and report whether this has fixed your problem. If it has not, we can walk you through a full manual rollback of the systemd package on your system. ** Attachment added: "60-persistent-storage.rules" https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/2035406/+attachment/5700985/+files/60-persistent-storage.rules -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/2035406 Title: udev update has broken ubuntu's ability to import photos in digikam, gphoto2 can no longer see usb camera, entangle can no longer see camera Status in systemd package in Ubuntu: Invalid Status in systemd source package in Jammy: Incomplete Status in systemd source package in Lunar: Invalid Status in systemd source package in Mantic: Invalid Bug description: udev update has broken ubuntu's ability to import photos in digikam, gphoto2 can no longer see usb camera, entangle can no longer see camera after Upgrade: udev:amd64 (249.11-0ubuntu3.9, 249.11-0ubuntu3.10), systemd-timesyncd:amd64 (249.11-0ubuntu3.9, 249.11-0ubuntu3.10), libpam-systemd:amd64 (249.11-0ubuntu3.9, 249.11-0ubuntu3.10), libpam-systemd:i386 (249.11-0ubuntu3.9, 249.11-0ubuntu3.10), libsystemd0:amd64 (249.11-0ubuntu3.9, 249.11-0ubuntu3.10), libsystemd0:i386 (249.11-0ubuntu3.9, 249.11-0ubuntu3.10), libnss-systemd:amd64 (249.11-0ubuntu3.9, 249.11-0ubuntu3.10), libudev-dev:amd64 (249.11-0ubuntu3.9, 249.11-0ubuntu3.10), systemd:amd64 (249.11-0ubuntu3.9, 249.11-0ubuntu3.10), libudev1:amd64 (249.11-0ubuntu3.9, 249.11-0ubuntu3.10), libudev1:i386 (249.11-0ubuntu3.9, 249.11-0ubuntu3.10), systemd-sysv:amd64 (249.11-0ubuntu3.9, 249.11-0ubuntu3.10) ubuntu no longer allows gphoto2 or entangle control of my dslr, lsusb sees the camera fine, but the upgrade broke the usage, and cant roll back shows it will break system to roll back please fix ASAP. ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: udev 249.11-0ubuntu3.10 ProcVersionSignature: Ubuntu 6.2.0-1009.9~22.04.1-lowlatency 6.2.13 Uname: Linux 6.2.0-1009-lowlatency x86_64 NonfreeKernelModules: wl ApportVersion: 2.20.11-0ubuntu82.5 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: KDE Date: Wed Sep 13 18:16:14 2023 InstallationDate: Installed on 2023-08-23 (21 days ago) InstallationMedia: Ubuntu-Studio 22.04.3 LTS "Jammy Jellyfish" - Release amd64 (20230807) MachineType: Alienware Alienware 18 ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.2.0-1009-lowlatency root=UUID=17502284-0952-44fe-81f8-54cebffc3800 ro threadirqs quiet splash vt.handoff=1 SourcePackage: systemd UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/22/2019 dmi.bios.vendor: Alienware dmi.bios.version: A15 dmi.board.name: 0FT9KT dmi.board.vendor: Alienware dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Alienware dmi.chassis.version: A15 dmi.ec.firmware.release: 1.1 dmi.modalias: dmi:bvnAlienware:bvrA15:bd07/22/2019:efr1.1:svnAlienware:pnAlienware18:pvrA15:rvnAlienware:rn0FT9KT:rvrA00:cvnAlienware:ct8:cvrA15:skuAlienware18: dmi.product.family: 00 dmi.product.name: Alienware 18 dmi.product.sku: Alienware 18 dmi.product.version: A15 dmi.sys.vendor: Alienware To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/2035406/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp