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SubjectRe: [LKP] [x86LKP] PANIC: double fault, error_code: 0xffffffffffffffff
Hi Andi,

On Mon, Oct 06, 2014 at 01:37:31PM -0700, Andi Kleen wrote:
>
> I cannot reproduce with the config/kvm script.
>
> Well the user space in your initrd hangs after boot, but I presume that's some
> different issue.

It should not be hang, but is taking some time to do the tests, and will reboot
after about 1 minute:

[ 1.047088] Write protecting the kernel read-only data: 10240k
[ 1.050967] Freeing unused kernel memory: 1248K (ffff8800014c8000 - ffff880001600000)
[ 1.056489] Freeing unused kernel memory: 1936K (ffff88000181c000 - ffff880001a00000)
[ 1.061008] random: init urandom read with 3 bits of entropy available
[ 62.208919] reboot: Restarting system

As the table shows, it's not an easily reproducible bug -- the possibility is
less than 10%:

+------------------------------------------+------------+------------+------------+
| | 598d570a05 | b8a868e9ea | 8048975233 |
+------------------------------------------+------------+------------+------------+
| boot_successes | 900 | 280 | 79 |
| boot_failures | 0 | 20 | 2 |
| PANIC:double_fault, | 0 | 12 | 2 |
| Kernel_panic-not_syncing:Machine_halted | 0 | 11 | 2 |
| BUG:unable_to_handle_kernel | 0 | 5 | |
| Oops | 0 | 3 | |
| RIP:pgd_free | 0 | 1 | |
| BUG:kernel_boot_crashed | 0 | 4 | |
| RIP:show_stack_log_lvl | 0 | 1 | |
| Kernel_panic-not_syncing:Fatal_exception | 0 | 1 | |
+------------------------------------------+------------+------------+------------+

> Do you have a different config or setup that shows it too?

The next email report titled "[x86] double fault: ffff [#1]" happens on another
config and it has much better reproduce ratio:

+-------------------------------------------------------+------------+------------+------------------+
| | 598d570a05 | b8a868e9ea | v3.17-rc7_100409 |
+-------------------------------------------------------+------------+------------+------------------+
| boot_successes | 207 | 24 | 17 |
| boot_failures | 3 | 46 | 4 |
| BUG:kernel_boot_crashed | 3 | | |
| double_fault:ffff | 0 | 39 | 4 |
| RIP:trace_hardirqs_off_thunk | 0 | 22 | 1 |
| BUG:unable_to_handle_kernel | 0 | 17 | 1 |
| Oops | 0 | 15 | 1 |
| RIP:show_stack_log_lvl | 0 | 14 | 1 |
| Kernel_panic-not_syncing:Fatal_exception_in_interrupt | 0 | 20 | 2 |
| RIP:trace_hardirqs_off_caller | 0 | 6 | 1 |
| BUG:kernel_boot_hang | 0 | 23 | 2 |
| backtrace:rescuer_thread | 0 | 1 | |
+-------------------------------------------------------+------------+------------+------------------+

You can use the same script to reproduce it. Only the kernel needs
rebuild with the attached config in that email.

Thanks,
Fengguang


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