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Re: [PULL 00/35] MIPS patches for 2021-01-03

From: Philippe Mathieu-Daudé
Subject: Re: [PULL 00/35] MIPS patches for 2021-01-03
Date: Mon, 4 Jan 2021 18:39:55 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0

On 1/4/21 4:01 PM, Peter Maydell wrote:
> On Mon, 4 Jan 2021 at 13:59, Philippe Mathieu-Daudé <f4bug@amsat.org> wrote:
>> I don't have access to OSX host. I'll see to install an aarch32 chroot and
>> keep testing (not sure what can differ from an i386 guest).
>> If I can't find anything I'll resend the same series without the Loongson-3
>> machine, which is the single part adding QOM objects.
> You might also try using valgrind/address-sanitizer/etc, which can
> sometimes flag up this kind of bug on x86-64 even if by default
> it happens to work.

On 32-bit I hit https://github.com/google/sanitizers/issues/954:

$ qemu-system-mips64el
==18063==ERROR: AddressSanitizer: SEGV on unknown address 0xb7f20e40 (pc
0xb7f20e54 bp 0xbf86556c sp 0xbf86552c T16777215)
==18063==The signal is caused by a WRITE memory access.
    #0 0xb7f20e53  (/lib/ld-linux.so.2+0x11e53)
    #1 0xeb9b59  (/tmp/build/qemu-system-mips64el+0xa86b59)
    #2 0xe9c1c2  (/tmp/build/qemu-system-mips64el+0xa691c2)
    #3 0xb7f1e8ea  (/lib/ld-linux.so.2+0xf8ea)
    #4 0xb7f0fcb9  (/lib/ld-linux.so.2+0xcb9)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/lib/ld-linux.so.2+0x11e53)

What is funny is Aurelien is mentioned in the GCC BZ =)

What libc do you use?

I'll try to downgrade or reinstall an old distrib...

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