New features:

• The trace() action supports array, struct, and union values.

• The execname built-in variables is now implemented.

• The inet_ntoa() subroutine has been implemented.

• The progenyof() subroutine has been implemented.

• The getmajor() and getminor() subroutines have been implemented.

• The mutex_owned(), mutex_owner(), mutex_type_adaptive(), mutex_type_spin(), rw_read_held(), rw_write_held(), and rw_iswriter() have been implemented.

• The alloca() and bcopy() subroutines have been implemented.

• Associative arrays have been implemented. They are supported for both global and TLS variables.

• Disassembler annotations have been added for associative arrays, register spills, and string constants.

• The translators have been updated to support up to kernel series 5.16.

• Faults will now report the PC (program counter) where the fault is reported.

Bugfixes:

• Register allocation leaks were fixed.

• NULL pointer verification has been optimized to avoid checking the same pointer more than once.

• NULL pointers handling in ternary conditionals are now supported.

• Casting of pointers to integers has been fixed.

• Negative (immediate) values in signed conditionals are now printed correctly.

• Disassembler annotations for TLS variables have been corrected.

• The DIFO strtab handling has been reworked to fix multiple bugs.

Internal changes:

• The strlen() subroutine is now implemented using the bpf_probe_read_str() BPF helper.

• Strings are no longer stored using a length prefix.

• BPF functions that are implemented in C or assembly code are no longer statically listed in the DTrace source code. Their existence is determined at runtime when the dlibs are loaded.

• All load-time constants are now handled by the relocation mechanism.

• New function dt_dis_insn() can be used by developers to disassemble a single instruction..

• The implementation of pre and post arithmetic has been optimized.

• Relocation support for the 'add immediate' instructions has been added.

• The substr() subroutine has been optimized to reduce register pressure.

Testsuite changes:

• Various tests have been moved from XFAIL to PASS status in response to the implementation of new features and in view of some bug fixes.

• Various tests were improved.