I write a module, and find kdump can't boot in this case. kernel version is 3.12, Intel(R) Xeon(R) CPU E5620
struct timer_list g_timer; void tmrhnd_invtssfault(unsigned long data) { long __res; printk(KERN_EMERG "invalid TSS fault in interrupt context.\n"); __asm__ volatile("int $0x0A" : "=a"(__res):); } { ... init_timer(&g_timer); g_timer.expires = jiffies + 10; g_timer.data = 0; g_timer.function = tmrhnd_invtssfault; add_timer(&g_timer); ... } If access NULL pointer instead of "__asm__ volatile("int $0x0A" : "=a"(__res):);" in tmrhnd_invtssfault(), kdump can boot. And if not use timer, just do "__asm__ volatile("int $0x0A" : "=a"(__res):);" only once in module, kdump can boot too. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/