Re: [x86LKP] PANIC: double fault, error_code: 0xffffffffffffffff

[Andy Lutomirski <luto@amacapital.net>]

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On 10/04/2014 11:38 PM, Andi Kleen wrote:
>> [    5.087621] Freeing unused kernel memory: 1248K (ffff8800014c8000 - ffff880001600000)
>> [    5.136856] Freeing unused kernel memory: 1936K (ffff88000181c000 - ffff880001a00000)
>> [    5.167951] random: init urandom read with 5 bits of entropy available
>> [   19.307116] PANIC: double fault, error_code: 0xffffffffffffffff
>> [   19.309941] Kernel panic - not syncing: Machine halted.
> 
> That's odd. I actually tested it in KVM.
> 
> Will try with your config.

In case it helps, Fengguang's bot seems to use rather old userspace
code.  It's entirely possible that it's doing something different with
arch_prctl than your userspace, causing gs or gsbase to behave differently.

--Andy

> 
>> kvm=(
>> 	qemu-system-x86_64
>> 	-cpu kvm64
>> 	-enable-kvm
>> 	-kernel $kernel
>> 	-initrd $initrd
>> 	-m 320
>> 	-smp 2
>> 	-net nic,vlan=1,model=e1000
>> 	-net user,vlan=1
>> 	-boot order=nc
>> 	-no-reboot
>> 	-watchdog i6300esb
>> 	-rtc base=localtime
>> 	-serial stdio
>> 	-display none
>> 	-monitor null 
>> )
> 
> -Andi
>