Re: [Qemu-devel] QEMU TCG issue when executing UEFI

[Ard Biesheuvel]

On 18 August 2016 at 12:40, Peter Maydell <address@hidden> wrote:
> On 16 August 2016 at 13:08, Ard Biesheuvel <address@hidden> wrote:
>> I am hitting this strange issue when executing the UEFI firmware for
>> QEMU mach-virt/AArch64. This only occurs when building the firmware
>> with GCC5 in RELEASE mode, but the failure mode suggests that this may
>> not be relevant.
>
> Yeah, we shouldn't dump core even if the guest binary is doing
> weird stuff...
>

Indeed. What I failed to mention is that this is an LTO build, which
means the individual functions are much larger. Not sure how this
should be relevant, but still worth mentioning, I suppose.

>> Running a aarch64-softmmu QEMU built from today's master, I get
>>
>> $ qemu-system-aarch64 -M virt -nographic -cpu cortex-a53 -bios QEMU_EFI.fd
>
>> Bad ram pointer 0x54
>> Aborted (core dumped)
>>
>> UEFI build is here
>> http://people.linaro.org/~ard.biesheuvel/QEMU_EFI.fd.xz
>
> Thanks for the bug report -- I have reproduced it and will have a look.
>
> This bug is also present in QEMU 2.6, so this isn't a recent regression
> and likely not a blocker for 2.7 release (unless the bug turns out to
> have a simple fix and be of the "how did this ever work" flavour ;-))
>

Thanks. Let me know if you need any more info.

-- 
Ard.