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Re: [Qemu-devel] Confusion regarding temporaries with branch conditional

From: Richard Henderson
Subject: Re: [Qemu-devel] Confusion regarding temporaries with branch conditional
Date: Wed, 30 Nov 2016 09:03:21 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0

On 11/30/2016 08:55 AM, Alex Bennée wrote:
> Nikunj A Dadhania <address@hidden> writes:
>> Hi,
>> I was writing one instruction and hit following issue:
>> [snip]/qemu/tcg/tcg.c:2039: tcg fatal error
>> qemu-ppc64le: [snip]/qemu/translate-all.c:175: tb_lock: Assertion 
>> `!have_tb_lock' failed.
>> Segmentation fault (core dumped)
> This is confusing because something is trying to take the tb_lock while
> you are in code generation. tb_lock is held for code generation to
> ensure serialisation of generation.

Yes, I've seen this myself.  I never got around to reporting the "problem"
properly.  It's a confusing side effect of a SIGSEGV arriving during tcg code
generation.  The signal handler longjmps back with unexpected locks held.

Probably we should simply crash earlier and less confusingly.


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