On Thu, 26 Apr 2018 16:26:19 -0400 Pavel Tatashin <pasha.tatashin@xxxxxxxxxx> wrote: > The following two bugs were reported by Fengguang Wu: > > kernel reboot-without-warning in early-boot stage, last printk: > early console in setup code > > http://lkml.kernel.org/r/20180418135300.inazvpxjxowogyge@xxxxxxxxxxxxxxxxxxxxxx > > ... > > --- a/init/main.c > +++ b/init/main.c > @@ -585,8 +585,8 @@ asmlinkage __visible void __init start_kernel(void) > setup_log_buf(0); > vfs_caches_init_early(); > sort_main_extable(); > - trap_init(); > mm_init(); > + trap_init(); > > ftrace_init(); Gulp. Let's hope that nothing in mm_init() requires that trap_init() has been run. What happens if something goes wrong during mm_init() and the architecture attempts to raise a software exception, hits a bus error, div-by-zero, etc, etc? Might there be hard-to-discover dependencies in such a case?
