Add BUG() debugger entry points
PATCH 1/4 Add BUG() debugger entry points
This patch series adds a config option which can be set during compile to direct the compiler to output a breakpoint instruction anywhere a BUG() macro has been placed in the kernel to trigger the system to enter a debugger if a bug is detected by the system. Use of this compile time option also allows conditional breakpoints to be set anywhere in the kernel.
This addition is extremely useful for debugging hard and soft lockups real time and quickly from a console debugger, and other areas of the kernel.
Signed-off-by Jeffrey Merkey <[email protected]>
--- kernel/watchdog.c | 6 ++++++ 1 file changed, 6 insertions(+)
kernel/watchdog.c +6 -0
@@ -358,6 +358,9 @@ static void watchdog_overflow_callback(struct perf_event *event,else dump_stack (); +#ifdef CONFIG_DEBUG_BREAK +BUG (); +#endif /* * Perform all-CPU dump only once to avoid multiple hardlockups * generating interleaving traces
@@ -478,6 +481,9 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)else dump_stack (); +#ifdef CONFIG_DEBUG_BREAK +BUG (); +#endif if (softlockup_all_cpu_backtrace) {/* Avoid generating two back traces for current * given that one is already made above
Signature · 1 line
1.8.3.1