Re: [lkp-robot] [x86/asm] f5caf621ee: PANIC:double_fault

Ingo Molnar
2017-09-28T07:59:12Z

* kernel test robot <xiaolong.ye@intel.com> wrote:

>
> FYI, we noticed the following commit:
>
> commit: f5caf621ee357279e759c0911daf6d55c7d36f03 ("x86/asm: Fix inline asm call constraints for Clang")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
>
> in testcase: trinity
> with following parameters:
>
> runtime: 300s
>
> test-description: Trinity is a linux system call fuzz tester.
> test-url: http://codemonkey.org.uk/projects/trinity/
>
>
> on test machine: qemu-system-x86_64 -enable-kvm -m 420M
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
> +-----------------------------------------+------------+------------+
> | | 0d0970eef3 | f5caf621ee |
> +-----------------------------------------+------------+------------+
> | boot_successes | 9 | 4 |
> | boot_failures | 0 | 4 |
> | PANIC:double_fault | 0 | 4 |
> | Kernel_panic-not_syncing:Machine_halted | 0 | 4 |
> +-----------------------------------------+------------+------------+

I think a key piece of information is that the test is using GCC 4.4:

export compiler='gcc-4.4'

... which is pretty old compared to what gets tested typically.

GCC 4.4 was released in 2009 (!), the last minor update of 4.4.7 was 5 years ago.

Thanks,

Ingo