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Peter Zijlstra
44b979fa30
Current code has an explicit check for hitting the task stack guard; but overflowing any of the other stacks will get you a non-descript general #DF warning. Improve matters by using get_stack_info_noinstr() to detetrmine if and which stack guard page got hit, enabling a better stack warning. In specific, Michael Wang reported what turned out to be an NMI exception stack overflow, which is now clearly reported as such: [] BUG: NMI stack guard page was hit at 0000000085fd977b (stack is 000000003a55b09e..00000000d8cce1a5) Reported-by: Michael Wang <[email protected]> Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Tested-by: Michael Wang <[email protected]> Link: https://lkml.kernel.org/r/YUTE/[email protected]