linux/kernel/kcsan/Makefile, branch v5.8

kcsan, trace: Make KCSAN compatible with tracing

2020-03-21T08:44:41Z

Previously the system would lock up if ftrace was enabled together with KCSAN. This is due to recursion on reporting if the tracer code is instrumented with KCSAN. To avoid this for all types of tracing, disable KCSAN instrumentation for all of kernel/trace. Furthermore, since KCSAN relies on udelay() to introduce delay, we have to disable ftrace for udelay() (currently done for x86) in case KCSAN is used together with lockdep and ftrace. The reason is that it may corrupt lockdep IRQ flags tracing state due to a peculiar case of recursion (details in Makefile comment). Reported-by: Qian Cai Tested-by: Qian Cai Acked-by: Steven Rostedt (VMware) Signed-off-by: Marco Elver Signed-off-by: Paul E. McKenney Signed-off-by: Ingo Molnar

kcsan, ubsan: Make KCSAN+UBSAN work together

2020-01-07T15:47:23Z

Context: http://lkml.kernel.org/r/fb7e25d8-aba4-3dcf-7761-cb7ecb3ebb71@infradead.org Reported-by: Randy Dunlap Signed-off-by: Marco Elver Acked-by: Randy Dunlap # build-tested Signed-off-by: Paul E. McKenney

kcsan: Add Kernel Concurrency Sanitizer infrastructure

2019-11-16T15:23:13Z

Kernel Concurrency Sanitizer (KCSAN) is a dynamic data-race detector for kernel space. KCSAN is a sampling watchpoint-based data-race detector. See the included Documentation/dev-tools/kcsan.rst for more details. This patch adds basic infrastructure, but does not yet enable KCSAN for any architecture. Signed-off-by: Marco Elver Acked-by: Paul E. McKenney Signed-off-by: Paul E. McKenney