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In the core runtime, we must minimize any calls to external library functions to avoid any kind of recursion. This can happen even though instrumentation is disabled for called functions, but tracing is enabled. Most recently, prandom_u32() added a tracepoint, which can cause problems for KCSAN even if the rcuidle variant is used. For example: kcsan -> prandom_u32() -> trace_prandom_u32_rcuidle -> srcu_read_lock_notrace -> __srcu_read_lock -> kcsan ... While we could disable KCSAN in kcsan_setup_watchpoint(), this does not solve other unexpected behaviour we may get due recursing into functions that may not be tolerant to such recursion: __srcu_read_lock -> kcsan -> ... -> __srcu_read_lock Therefore, switch to using prandom_u32_state(), which is uninstrumented, and does not have a tracepoint. Link: https://lkml.kernel.org/r/20200821063043.1949509-1-elver@google.com Link: https://lkml.kernel.org/r/20200820172046.GA177701@elver.google.com Signed-off-by: Marco Elver <elver@google.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> |
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| .. | ||
| atomic.h | ||
| core.c | ||
| debugfs.c | ||
| encoding.h | ||
| kcsan-test.c | ||
| kcsan.h | ||
| Makefile | ||
| report.c | ||
| selftest.c | ||