Re: [Qemu-devel] Bug in mips user-linux

[Yongbok Kim]

On 19/10/2016 09:26, Thomas Huth wrote:
> On 10.10.2016 03:01, Torbjörn Granlund wrote:
>> This is a long-standing issue; I've reproduced it in 2.5.0, 2.6.2, and
>> 2.7.0.
>>
>> Command used:  qemu-mipsn32 ./reuse
>>
>> The binary file 'reuse' is attached.
>>
>> Funnily enough, it does not fail every time.  (I would expect user-level
>> emulation to be pretty deterministic, but alas, this is not.)
>>
>> When it fails, it either says,
>>
>>   qemu: uncaught target signal 11 (Segmentation fault) - core dumped
>>   Segmentation fault
>>
>> or unfrequently,
>>
>>   mipsn: /var/tmp/build.2567/qemu-2.6.2/translate-all.c:1884: 
>> page_set_flags: Assertion `start < end' failed.
>>   qemu: uncaught target signal 6 (Aborted) - core dumped
>>
>> while the same binary runs fine on hardware as well as
>> emulated systems running under qemu-system-mips64.
>>
>> The failures only happen for the n32 ABI (not o32 or 64).
>>
>> This test case comes from GMP (default gcc compile of
>> gmp/tests/mpz/reuse.c).
>>
>> (Host and guest systems all run Debian 8.)
> 
> Could you maybe get a proper backtrace of the crash with gdb? I guess
> that would help to track down the problem.
> And please make sure to copy the MIPS maintainers on CC: when reporting
> such issues (see MAINTAINERS file), otherwise your mail might get lost
> in the high traffic of the qemu-devel mailing list.
> 
>  Thanks,
>   Thomas
> 

Hi I've tested the binary with the upstream but couldn't reproduce the
problem. Would you please provide more details?

Regards,
Yongbok