<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - Long expressions in shaders crash Mesa" href="https://bugs.freedesktop.org/show_bug.cgi?id=71574#c7">Comment # 7</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - Long expressions in shaders crash Mesa" href="https://bugs.freedesktop.org/show_bug.cgi?id=71574">bug 71574</a> from <a class="email" href="mailto:kevin.rogovin@intel.com" title="Kevin Rogovin <kevin.rogovin@intel.com>"> Kevin Rogovin</a> <pre>It is debatable whether the shaders that are crashing Mesa really matter as they would not happen in the wild. The cause is the following. A tree is built via bison generated code. That code implements its own stack. However, the tree is walked via recursion using the OS-provided stack. The crash happens essentially (I think) because of stack overflow. Increasing the stack size of walking the tree will just make the bug happen with even larger expression. The right thing to do is for the Bison generated code to generate a tree depth value for the tree and the code that walks a tree checks the depth value and rejects it as "too complicated" if the tree depth is too great.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>