On Fri, Oct 24, 2014 at 08:53:27AM -0400, Prarit Bhargava wrote: > There have been several times where I have had to rebuild a kernel to > cause a panic when hitting a WARN() in the code in order to get a crash > dump from a system. Sometimes this is easy to do, other times (such as > in the case of a remote admin) it is not trivial to send new images to the > user. > > A much easier method would be a switch to change the WARN() over to a > BUG(). This makes debugging easier in that I can now test the actual > image the WARN() was seen on and I do not have to engage in remote > debugging. IMHO this would be better and far more generically done with kdb. You would need two things: - Extend the break point command to run another command on a break point. - Add a command line (or possibly /proc) option to execute some kdb commands at kernel boot. Then just set a break point on the warn function and execute magic sysrq c from kdb. -Andi
