[BUG] term freezes on XEmacs 21.4.* on *-dec-osf*

When larger text is inserted to term (or matlab-shell) it freezes on XEmacs 21.4.* (ev56|ev6|ev67)-dec-osf(4.0d|4.0f|5.0) On XEmacs 21.1.* term (or matlab-shell) does not freeze like this. How to reproduce the problem: --- xemacs -vanilla M-x term <Copy, e.g., with mouse following text to term and press enter> echo foooooooooooooooooooooooooooooooooooooooooooo echo foooooooooooooooooooooooooooooooooooooooooooo echo foooooooooooooooooooooooooooooooooooooooooooo echo foooooooooooooooooooooooooooooooooooooooooooo echo foooooooooooooooooooooooooooooooooooooooooooo echo foooooooooooooooooooooooooooooooooooooooooooo <term executes those echo commands, and after that it beeps, freezes and does not respond to anything (note that XEmacs does not freeze, just the term)> --- Below is example Installation description. Note that same problem appears with and without REGEX_MALLOC. --- uname -a: OSF1 biton.lce.hut.fi V4.0 1229 alpha alpha /proj/ave/xemacs/xemacs-21.4.2/configure '--prefix=/proj/ave/xemacs/' '--srcdir=/proj/ave/xemacs/xemacs-21.4.2' '--site-includes=/usr/local/include' '--site-libraries=/usr/local/lib' '--cppflags=-DREGEX_MALLOC' XEmacs 21.4.2 "Developer-Friendly Unix APIs" configured for `alphaev67-dec-osf4.0f'. Compilation / Installation: Source code location: /proj/ave/xemacs/xemacs-21.4.2 Installation prefix: /proj/ave/xemacs/ Additional header files: /usr/local/include Additional libraries: /usr/local/lib Runtime library search path: /usr/local/lib:/usr/dt/lib Operating system description file: `s/decosf4-0.h' Machine description file: `m/alpha.h' Compiler: cc -O3 Relocating allocator for buffers: yes GNU version of malloc: yes Window System: Compiling in support for the X window system: - X Windows headers location: /usr/dt/include - X Windows libraries location: /usr/dt/lib - Handling WM_COMMAND properly. Using Lucid menubars. Using Lucid scrollbars. Using Motif dialog boxes. Using Motif native widgets. TTY: Images: Compiling in support for GIF images (builtin). Compiling in support for XPM images. Compiling in support for PNG images. Sound: Databases: Compiling in support for Berkeley database. Compiling in support for DBM. Internationalization: Mail: Compiling in support for "flock" mail spool file locking method. Other Features: Compiling in support for ToolTalk. Compiling in support for dynamic shared object modules.