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

[m.martin]

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

pmutex.c
Description: pmutex.c