On Tue, 24 Apr 2018 13:04:23 -0700 Linus Torvalds <torva...@linux-foundation.org> wrote:
> On Tue, Apr 24, 2018 at 12:54 PM, Jesper Dangaard Brouer > <bro...@redhat.com> wrote: > > Hi all, > > > > I'm experiencing boot failures with net-next git-tree after it got > > rebased/merged with Linus'es tree at v4.17.0-rc1. > > I suspect it's the global bit stuff that came in very late in the > merge window, and had been developed and tested for a while before, > but showed some problems under some configs. > > The fix is currently in the x86/pti tree in -tip, see: > > x86/pti: Fix boot problems from Global-bit setting > > and I expect it will percolate upstream soon. > > In the meantime, it would be good to verify that merging that x86/pti > branch fixes it for you? Thanks for spotting this so quickly! I have verified that this DOES solve the issue for me :-))) If others are hit by this, and cannot wait for Linus to pull the tip tree, this is the pull command: git pull git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/pti > There is another candidate for boot problems - do you happen to have > CONFIG_DEFERRED_STRUCT_PAGE_INIT enabled? That can under certain > circumstances get a percpu setup page fault because memory hadn't been > initialized sufficiently. CONFIG_DEFERRED_STRUCT_PAGE_INIT is not set > The fix there is to move the mm_init() call one step earlier in > init_main(): start_kernel() (to before trap_init()). > > And if it's neither of the above, I think you'll need to help bisect it. -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat LinkedIn: http://www.linkedin.com/in/brouer
