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Date: Fri, 12 Nov 2010 19:06:37 -0500 From: Jody Bruchon <jody@...ritech.com> To: linux-kernel@...r.kernel.org Subject: ACPI+Inspiron 1545 = crash at xrstor_state() I previously reported a boot hang on an Inspiron 1545 laptop which is cured by disabling CONFIG_ACPI. I didn't know about the "earlyprintk" boot option, and upon using it, I was able to see the actual crash. Hopefully the following information will help. Note that I have turned off SMP and APIC/LAPIC support, but the bug persists even with these disabled (I noticed a lot of APIC/IO-APIC code that is eliminated in early boot if they're disabled.) The crash was in function xsave_init with EIP at xstate_enable_boot_cpu (the last normal message output before this was "Initializing CPU#0"). To narrow this down further, I edited xsave.c to be full of printk() messages for each called function. The last printk message indicates that the function in xsave.c which crashes out is: xrstor_state(init_xstate_buf, -1); The result is a general protection fault. xrstor_state is just a tiny piece of asm code, and at this point I've reached the extent of my current capabilities, so I don't know where to go from here. I can manually type out chunks of the crash info on request. I'm clueless as to how the inclusion of ACPI causes this. Please CC my email if you respond since I don't subscribe to LKML. Thanks in advance. Jody Bruchon -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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