On Wed, Jun 03, 2020 at 01:40:14PM +0200, Peter Zijlstra wrote: > The first patch is a fix for x86/entry, I'm quicky runing out of brown paper > bags again :/ > > The rest goes on top of these: > > https://lkml.kernel.org/r/20200602173103.931412...@infradead.org > https://lkml.kernel.org/r/20200602184409.22142-1-el...@google.com > > patches from myself and Marco that enable *SAN builds. So far GCC-KASAN seen > to > behave quite well, I've yet to try UBSAN.
GCC10 + UBSAN: vmlinux.o: warning: objtool: match_held_lock()+0x1b2: call to __ubsan_handle_type_mismatch_v1() leaves .noinstr.text section vmlinux.o: warning: objtool: rcu_nmi_enter()+0x234: call to __ubsan_handle_out_of_bounds() leaves .noinstr.text section vmlinux.o: warning: objtool: __rcu_is_watching()+0x59: call to __ubsan_handle_out_of_bounds() leaves .noinstr.text section All of them are marked noinstr. So I suppose UBSAN is just buggered in GCC :-/
