Hi, we are encountering reboot freezes on the current 5.4.66-rt38 kernel with PREEMPT_RT enabled on i.mx8mm hardware. Unfortunately, debugging is difficult in this situation as the only related output we get during reboot (via serial console) is: Rebooting... Segmentation fault However, the second line is not shown on every reboot; the freeze happens everytime. We already tried various kernel command line options (print-fatal-signals=1 oops=panic), earlyprintk/earlycon and a lot of debug printk's in the kernel source. However it seems that there is no output after `kernel_restart_prepare(cmd);` in kernel/reboot.c. When using the same kernel version without PREEMPT_RT, the issue does not occur. Do you have any hints for further debugging? Thank you very much in advance. Regards, Aaron Marcher
