On Wed, Dec 12, 2018 at 7:36 PM Anders Roxell <anders.roxell@xxxxxxxxxx> wrote: > > When option CONFIG_KASAN is enabled toghether with ftrace, function > ftrace_graph_caller() gets in to a recursion, via functions > kasan_check_read() and kasan_check_write(). > > Breakpoint 2, ftrace_graph_caller () at ../arch/arm64/kernel/entry-ftrace.S:179 > 179 mcount_get_pc x0 // function's pc > (gdb) bt > #0 ftrace_graph_caller () at ../arch/arm64/kernel/entry-ftrace.S:179 > #1 0xffffff90101406c8 in ftrace_caller () at ../arch/arm64/kernel/entry-ftrace.S:151 > #2 0xffffff90106fd084 in kasan_check_write (p=0xffffffc06c170878, size=4) at ../mm/kasan/common.c:105 > #3 0xffffff90104a2464 in atomic_add_return (v=<optimized out>, i=<optimized out>) at ./include/generated/atomic-instrumented.h:71 > #4 atomic_inc_return (v=<optimized out>) at ./include/generated/atomic-fallback.h:284 > #5 trace_graph_entry (trace=0xffffffc03f5ff380) at ../kernel/trace/trace_functions_graph.c:441 > #6 0xffffff9010481774 in trace_graph_entry_watchdog (trace=<optimized out>) at ../kernel/trace/trace_selftest.c:741 > #7 0xffffff90104a185c in function_graph_enter (ret=<optimized out>, func=<optimized out>, frame_pointer=18446743799894897728, retp=<optimized out>) at ../kernel/trace/trace_functions_graph.c:196 > #8 0xffffff9010140628 in prepare_ftrace_return (self_addr=18446743592948977792, parent=0xffffffc03f5ff418, frame_pointer=18446743799894897728) at ../arch/arm64/kernel/ftrace.c:231 > #9 0xffffff90101406f4 in ftrace_graph_caller () at ../arch/arm64/kernel/entry-ftrace.S:182 > Backtrace stopped: previous frame identical to this frame (corrupt stack?) > (gdb) > > Rework so that the kasan implementation isn't traced. Acked-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Thanks! > Signed-off-by: Anders Roxell <anders.roxell@xxxxxxxxxx> > --- > mm/kasan/Makefile | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/mm/kasan/Makefile b/mm/kasan/Makefile > index 0a14fcff70ed..e2bb06c1b45e 100644 > --- a/mm/kasan/Makefile > +++ b/mm/kasan/Makefile > @@ -5,6 +5,7 @@ UBSAN_SANITIZE_generic.o := n > UBSAN_SANITIZE_tags.o := n > KCOV_INSTRUMENT := n > > +CFLAGS_REMOVE_common.o = -pg > CFLAGS_REMOVE_generic.o = -pg > # Function splitter causes unnecessary splits in __asan_load1/__asan_store1 > # see: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63533 > -- > 2.19.2 >
