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Re: [Qemu-devel] qemu-system-ppc TCG assert with git master

From: Bastian Koppelmann
Subject: Re: [Qemu-devel] qemu-system-ppc TCG assert with git master
Date: Thu, 12 Mar 2015 16:51:24 +0000
User-agent: Mozilla/5.0 (X11; Linux i686; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

On 03/12/2015 03:41 PM, Richard Henderson wrote:
On 03/12/2015 01:41 AM, Mark Cave-Ayland wrote:
Whilst testing git master in preparation for some OpenBIOS updates, I'm
seeing the following TCG assert in one of my older test images:

$ gdb --args ./qemu-system-ppc -cdrom
/home/build/src/qemu/image/ppc/ubuntu-5.10-live-powerpc.iso -boot d -g
Older, eh?  I can only find 5.04.  ;-)

And, fwiw, that doesn't assert.  I get all the way to

Kernel panic - not syncing: VFS: unable to mount root fs on unknown-block(1,0)

So, I guess I need something different to


to reproduce this.


Hi Richard,

I can reproduce it fine here with http://old-releases.ubuntu.com/releases/5.10/. As far as I see it, the Instruction at 0xc9105830 generates a mov 0 to r30, which is optimized by tcg_opt_gen_mov and r30 is set to TCG_TEMP_CONST. When 0xc9105838 or r0, r30, r30 should be optimized r30 is already in the state TCG_TEMP_CONST and the assert fails.


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