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From: Pranith Kumar <bobby.prani@gmail.com>
Date: Thu, 16 Oct 2014 12:05:46 -0400
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Subject: Re: [Qemu-devel] Counting barrier instructions in ARM
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To: Max Filippov <jcmvbkbc@gmail.com>
Cc: qemu-devel <qemu-devel@nongnu.org>

On Wed, Oct 15, 2014 at 10:12 PM, Max Filippov <jcmvbkbc@gmail.com> wrote:
> On Thu, Oct 16, 2014 at 6:00 AM, Pranith Kumar <bobby.prani@gmail.com> wrote:
>>>> +        tcg_gen_add_i32(cpu_fence_count, cpu_fence_count, 1);
>>>
>>> tcg_gen_addi_i32, as you're adding an immediate.
>>> Enabling TCG debug would catch such errors.
>>> Not sure if that will fix crashing, but it should improve accuracy (:
>>
>> I had that before the change to tcg_gen_add_i32 and the crashes were
>> still there. But yes, this needs to be changed to use addi.
>
> Got backtraces of your crashes?
>

These bugs seem to be Heisenbugs. As Peter Maydell pointed out,
apparently multi-threaded user mode execution is not supported.

I will try to use system mode.

Thanks!

-- 
Pranith