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SMP, the machine check exception dispatches all logical processors within a physical package to the machine-check exception handler, so the printk within each handler outputs concurrently and makes the output unreadable. Refer to Intel system programming guide Part 1 Section 7.8.5 http://developer.intel.com/design/processor/manuals/253668.pdf Signed-off-by: Min Zhang <mzhang@mvista.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>