RetroArch aborts with "stack smashing detected" when more than 8 controllers are connected on ARM device

Is there an existing issue for this?

• This is a bug in RetroArch frontend
• I have searched the existing issues

Description

$ retroarch
*** stack smashing detected ***: terminated
Aborted

Expected behavior

$ retroarch
# no crash

Steps to reproduce the bug

Connect more than 8 controllers to the system.

Hint: No need to connect real controllers physically; software-only controllers may be created using https://github.com/GrantEdwards/uinput-joystick-demo/

Version/Commit

1.16.0

Bisect Results

No response

Present in the nightly version

I don't know

Platform & operating system

Linux aarch64, Linux armv7l

Affected Cores

No response

Environment information

• Hardware: Raspberry Pi 3 Model B Rev 1.2
• OS: Batocera 42 on aarch64, Batocera 39 on armv7l

The error does not occur on x86_64 platform. The error does not occur when <= 8 controllers are connected.

retroarch.broken.log
retroarch.ok.log
retroarch.strace-broken.log
retroarch.strace-ok.log

Relevant log output

Start by reproducing the crash on the listed ARM platforms with more than 8 software-created controllers, then compare retroarch.broken.log, retroarch.ok.log, and the corresponding strace files attached to the issue. Trace the controller-count handling to identify the failing source area; done means RetroArch launches without aborting when more than 8 controllers are connected.