1) No, it is not appropriate to test a non LTS kernel on a LTS distribution.
2) I did you a favor and tested on the previous LTS kernel (linux- image-5.4.0-28-generic) and the latest LTS kernel (linux- image-5.4.0-31-generic) and could not reproduce on either after running dd 3-5 times on each. However, the kernel I reported on (linux-image-5.4.0-29-generic) produced the stack trace after the 2nd attempt. Maybe I didn't collect enough samples, but the point here is the previous kernel was not broken, nor is the latest. Something may be different in linux- image-5.4.0-29-generic. May 22 20:12:39 quad kernel: [ 1088.902612] INFO: task systemd-udevd:451 blocked for more than 120 seconds. May 22 20:12:39 quad kernel: [ 1088.902618] Tainted: P IOE 5.4.0-29-generic #33-Ubuntu May 22 20:12:39 quad kernel: [ 1088.902620] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. May 22 20:12:39 quad kernel: [ 1088.902623] systemd-udevd D 0 451 1 0x00004124 May 22 20:12:39 quad kernel: [ 1088.902626] Call Trace: May 22 20:12:39 quad kernel: [ 1088.902636] __schedule+0x2e3/0x740 May 22 20:12:39 quad kernel: [ 1088.902639] schedule+0x42/0xb0 May 22 20:12:39 quad kernel: [ 1088.902641] schedule_preempt_disabled+0xe/0x10 May 22 20:12:39 quad kernel: [ 1088.902644] __mutex_lock.isra.0+0x182/0x4f0 May 22 20:12:39 quad kernel: [ 1088.902649] ? exact_lock+0x11/0x20 May 22 20:12:39 quad kernel: [ 1088.902652] __mutex_lock_slowpath+0x13/0x20 May 22 20:12:39 quad kernel: [ 1088.902654] mutex_lock+0x2e/0x40 May 22 20:12:39 quad kernel: [ 1088.902658] __blkdev_get+0x78/0x550 May 22 20:12:39 quad kernel: [ 1088.902661] blkdev_get+0x3d/0x140 May 22 20:12:39 quad kernel: [ 1088.902663] ? blkdev_get_by_dev+0x50/0x50 May 22 20:12:39 quad kernel: [ 1088.902665] blkdev_open+0x8f/0xa0 May 22 20:12:39 quad kernel: [ 1088.902670] do_dentry_open+0x143/0x3a0 May 22 20:12:39 quad kernel: [ 1088.902672] vfs_open+0x2d/0x30 May 22 20:12:39 quad kernel: [ 1088.902676] do_last+0x194/0x900 May 22 20:12:39 quad kernel: [ 1088.902679] path_openat+0x8d/0x290 May 22 20:12:39 quad kernel: [ 1088.902682] do_filp_open+0x91/0x100 May 22 20:12:39 quad kernel: [ 1088.902686] ? __alloc_fd+0x46/0x150 May 22 20:12:39 quad kernel: [ 1088.902689] do_sys_open+0x17e/0x290 May 22 20:12:39 quad kernel: [ 1088.902691] __x64_sys_openat+0x20/0x30 May 22 20:12:39 quad kernel: [ 1088.902695] do_syscall_64+0x57/0x190 May 22 20:12:39 quad kernel: [ 1088.902699] entry_SYSCALL_64_after_hwframe+0x44/0xa9 May 22 20:12:39 quad kernel: [ 1088.902702] RIP: 0033:0x7f31ed7bdd1b May 22 20:12:39 quad kernel: [ 1088.902709] Code: Bad RIP value. May 22 20:12:39 quad kernel: [ 1088.902710] RSP: 002b:00007ffdc7cf3f50 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 May 22 20:12:39 quad kernel: [ 1088.902712] RAX: ffffffffffffffda RBX: 00007ffdc7cf4060 RCX: 00007f31ed7bdd1b May 22 20:12:39 quad kernel: [ 1088.902714] RDX: 00000000000a0800 RSI: 000055f3f78a27d0 RDI: 00000000ffffff9c May 22 20:12:39 quad kernel: [ 1088.902715] RBP: 000055f3f78a27d0 R08: 000055f3f66940c0 R09: 0000000000000000 May 22 20:12:39 quad kernel: [ 1088.902716] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800 May 22 20:12:39 quad kernel: [ 1088.902717] R13: 000055f3f78759d0 R14: 00007ffdc7cf4028 R15: ffffffff00000001 -- 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/1879017 Title: dd caused systemd-udevd call trace Status in linux package in Ubuntu: Incomplete Bug description: Using dd to copy an image onto sdcard seems to cause a kernel stack trace. dd seems to hang. [ 3747.220647] INFO: task systemd-udevd:2451 blocked for more than 483 seconds. [ 3747.220652] Tainted: P IOE 5.4.0-29-generic #33-Ubuntu [ 3747.220654] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 3747.220656] systemd-udevd D 0 2451 1 0x00004124 [ 3747.220660] Call Trace: [ 3747.220670] __schedule+0x2e3/0x740 [ 3747.220673] schedule+0x42/0xb0 [ 3747.220675] schedule_preempt_disabled+0xe/0x10 [ 3747.220678] __mutex_lock.isra.0+0x182/0x4f0 [ 3747.220683] ? exact_lock+0x11/0x20 [ 3747.220685] __mutex_lock_slowpath+0x13/0x20 [ 3747.220687] mutex_lock+0x2e/0x40 [ 3747.220692] __blkdev_get+0x78/0x550 [ 3747.220694] blkdev_get+0x3d/0x140 [ 3747.220697] ? blkdev_get_by_dev+0x50/0x50 [ 3747.220699] blkdev_open+0x8f/0xa0 [ 3747.220704] do_dentry_open+0x143/0x3a0 [ 3747.220706] vfs_open+0x2d/0x30 [ 3747.220710] do_last+0x194/0x900 [ 3747.220713] path_openat+0x8d/0x290 [ 3747.220716] do_filp_open+0x91/0x100 [ 3747.220720] ? __alloc_fd+0x46/0x150 [ 3747.220722] do_sys_open+0x17e/0x290 [ 3747.220724] __x64_sys_openat+0x20/0x30 [ 3747.220729] do_syscall_64+0x57/0x190 [ 3747.220735] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 3747.220738] RIP: 0033:0x7f18e48a1d1b [ 3747.220745] Code: Bad RIP value. [ 3747.220746] RSP: 002b:00007ffd19e936a0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 3747.220748] RAX: ffffffffffffffda RBX: 00007ffd19e937b0 RCX: 00007f18e48a1d1b [ 3747.220749] RDX: 00000000000a0800 RSI: 0000558d7f09f470 RDI: 00000000ffffff9c [ 3747.220750] RBP: 0000558d7f09f470 R08: 0000558d7d4740c0 R09: 0000000000000000 [ 3747.220751] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800 [ 3747.220752] R13: 0000558d7f0b2920 R14: 00007ffd19e93778 R15: ffffffff00000001 ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.4.0-29-generic 5.4.0-29.33 ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30 Uname: Linux 5.4.0-29-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu27 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: js1 1209 F.... pulseaudio /dev/snd/controlC1: js1 1209 F.... pulseaudio /dev/snd/controlC0: js1 1209 F.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: LXQt Date: Fri May 15 22:44:18 2020 InstallationDate: Installed on 2020-02-02 (103 days ago) InstallationMedia: Lubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017.1) MachineType: Dell Inc. Precision WorkStation T7500 ProcFB: 0 VESA VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-29-generic root=UUID=93fc02c6-baa4-4282-96d7-ea5ad53b0c78 ro ipv6.disable=1 elevator=deadline splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.4.0-29-generic N/A linux-backports-modules-5.4.0-29-generic N/A linux-firmware 1.187 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 10/15/2018 dmi.bios.vendor: Dell Inc. dmi.bios.version: A18 dmi.board.name: 0D881F dmi.board.vendor: Dell Inc. dmi.board.version: A05 dmi.chassis.type: 7 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA18:bd10/15/2018:svnDellInc.:pnPrecisionWorkStationT7500:pvr:rvnDellInc.:rn0D881F:rvrA05:cvnDellInc.:ct7:cvr: dmi.product.name: Precision WorkStation T7500 dmi.sys.vendor: Dell Inc. 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