On Mon, 30 Apr 2018 16:26:58 -0700 Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: > 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? I mentioned the same thing. -- Steve
