'How can I debug SIGSEV in operator new on Linux

I have a case where my application crashes in operator new with SIGSEV when the a certan user action is performed.

It's repeatable for a certain action but it doesn't always crash when the user performs the particular actoin, perhaps crash 20% of the times the action is performed.
The application is written in C++14 and uses Qt for GUI. Can be built for both Linux and Windows
The problem exists only on Linux
valgrind has not revealed any memory issues

The call stack shows

tcache_get
__GI__libc_malloc
operator new(unsigned long)
x = new myobject(arg);

Anyone one that can give a hint on how to identify the issue?

Sources

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