Re: [Qemu-devel] qemu arm emulation not working correctly in debian stretch

[Philippe Mathieu-Daudé]

Cc'ing Linux user maintainers (you can see the entry in the MAINTAINERS
file in the source tree).

On 9/17/18 4:51 PM, address@hidden wrote:
> Hello everyone,
> 
> My name is Michael. I'm working for voestalpine in an embedded software 
> project for railways diagnostics.
> 
> Before filing a bug on Launchpad I wanted to write to this list to get a 
> proper judgement of our problem.
> 
> We use the gcc cross compiler for armhf architecture and qemu to execute some 
> of the built executables on an x86_64 host under Debian Jessie.
> We would like to switch to Debian Stretch for various reasons but found the 
> following problem:
> 
> The qemu-arm emulation delivered by debian > jessie seems to not support the 
> pthread-protocol PTHREAD_PRIO_INHERIT.
> A testcase is attached. The binary can be configured to use recursive mutexes 
> by using the -r flag, and enable the priority inheritance via -p flag. It 
> should not stop regardless the combination of flags.
> Compile natively (amd64/i386):
> gcc pmutex.c -pthread -o pmutex
> compile cross:
> arm-linux-gnueabihf-gcc pmutex.c -pthread -o pmutex.armhf
> As matter of fact, using the -p flag inside the qemu emulation for debian 
> stretch or buster, the application returns the PTHREAD_PRIO_INHERIT as not 
> supported and locks upon recursive usage. Using this binary on a debian 
> jessie installation, it works.
> 
> We need the PTHREAD_PRIO_INHERIT since we use an RT patched kernel (4.1.40).
> 
> I would be very grateful if someone could give a hint how to get this fixed 
> such that we can switch to Debian Stretch.
> Please tell me if I should provide additional information or if I made some 
> mistake by writing to this list.
> 
> Thanks in advance for your help.
> 
> Kind regards
> Michael
>