Can you please add kernel parameter "dyndbg='file drivers/base/* +p'" and attach full dmesg here?
-- 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/1886827 Title: Machine hangs when doing a normal reboot Status in linux package in Ubuntu: Incomplete Bug description: Hi, When booting into kernel 4.15.0-99-generic or higher and also kernel 5.3.0-53-generic or higher, the system hangs when issuing the reboot command or CTRL-ALT-DEL from console with the following console messages: ---------- snip ------------ Reached target Final Step. Starting Reboot... < following message repeats indefinetely every 120 seconds > INFO: task systemd-shutdow:1 blocked for more than 120 seconds. Not tainted 4.15.0-99-generic #100 " echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. ---------- snip ------------ I did a git bisect procedure between kernels 4.15.0-96-generic and 4.15.0-99 and it reported the following: ---------- snip ------------ b52be79f3c6cc89bb3834c5174843e34f945f386 is the first bad commit commit b52be79f3c6cc89bb3834c5174843e34f945f386 ---------- snip ------------ Ubuntu version affected: Ubuntu 4.15.0-99.100-generic 4.15.18 First kernel package affected: linux-image-4.15.0-99-generic Necessary debug files will be attached as soon as possible. Quinn To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1886827/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
