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diff --git a/erts/doc/src/notes.xml b/erts/doc/src/notes.xml index fb33710340..fcc7ec5b66 100644 --- a/erts/doc/src/notes.xml +++ b/erts/doc/src/notes.xml @@ -31,774 +31,6 @@ </header> <p>This document describes the changes made to the ERTS application.</p> -<section><title>Erts 10.0</title> - - <section><title>Fixed Bugs and Malfunctions</title> - <list> - <item> - <p> - The type specifications for <c>file:posix/0</c> and - <c>inet:posix/0</c> have been updated according to which - errors file and socket operations should be able to - return.</p> - <p> - Own Id: OTP-14019 Aux Id: ERL-550 </p> - </item> - <item> - <p> - Fix error printout from run_erl and a bug that could - cause unintended fds to be leaked into the started - program.</p> - <p> - Own Id: OTP-14537 Aux Id: PR1529 </p> - </item> - <item> - <p> File operations used to accept <seealso - marker="kernel:file#type-name_all">filenames</seealso> - containing null characters (integer value zero). This - caused the name to be truncated and in some cases - arguments to primitive operations to be mixed up. - Filenames containing null characters inside the filename - are now <em>rejected</em> and will cause primitive file - operations to fail. </p> <p> Also environment variable - operations used to accept <seealso - marker="kernel:os#type-env_var_name">names</seealso> and - <seealso - marker="kernel:os#type-env_var_value">values</seealso> of - environment variables containing null characters (integer - value zero). This caused operations to silently produce - erroneous results. Environment variable names and values - containing null characters inside the name or value are - now <em>rejected</em> and will cause environment variable - operations to fail. </p> <p>Primitive environment - variable operations also used to accept the <c>$=</c> - character in environment variable names causing various - problems. <c>$=</c> characters in environment variable - names are now also <em>rejected</em>. </p> <p>Also - <seealso - marker="kernel:os#cmd/1"><c>os:cmd/1</c></seealso> now - reject null characters inside its <seealso - marker="kernel:os#type-os_command">command</seealso>. - </p> <p><seealso - marker="erts:erlang#open_port/2"><c>erlang:open_port/2</c></seealso> - will also reject null characters inside the port name - from now on.</p> - <p> - *** POTENTIAL INCOMPATIBILITY ***</p> - <p> - Own Id: OTP-14543 Aux Id: ERL-370 </p> - </item> - <item> - <p> - Fix bugs related to the bookkeeping of microstate - accounting states.</p> - <p> - Own Id: OTP-14652</p> - </item> - <item> - <p><c>os:putenv</c> and <c>os:getenv</c> no longer access - the process environment directly and instead work on a - thread-safe emulation. The only observable difference is - that it's <em>not</em> kept in sync with libc - <c>getenv(3)</c> / <c>putenv(3)</c>, so those who relied - on that behavior in drivers or NIFs will need to add - manual synchronization.</p> <p>On Windows this means that - you can no longer resolve DLL dependencies by modifying - the <c>PATH</c> just before loading the driver/NIF. To - make this less of a problem, the emulator now adds the - target DLL's folder to the DLL search path.</p> - <p> - *** POTENTIAL INCOMPATIBILITY ***</p> - <p> - Own Id: OTP-14666</p> - </item> - <item> - <p>Corrected <c>erlang:is_builtin(erlang, M, F)</c> to - return <c>true</c> for <c>apply/2</c> and - <c>yield/0</c>.</p> - <p> - Own Id: OTP-14713 Aux Id: ERL-500 </p> - </item> - <item> - <p>Fixed a bug where the PATH environment variable wasn't - updated correctly on a release downgrade, effectively - keeping the PATH of the new release.</p> - <p> - Own Id: OTP-14719</p> - </item> - <item> - <p>A receive optimization that avoids scanning the entire - message queue when receiving a message containing a - freshly created reference could in rare circumstances - (involving recursive calls to the functions that does the - receive) cause the receive to hang. This has been - corrected.</p> - <p> - Own Id: OTP-14782 Aux Id: ERL-511 </p> - </item> - <item> - <p> - Fix building of Erlang/OTP on platforms which have small - data area with short addressing. For example the - PowerPC/RTEMS platform.</p> - <p> - Own Id: OTP-14909 Aux Id: PR-1692 </p> - </item> - <item> - <p>Fixed a crash when <c>enif_make_binary</c> is called - with a binary produced by <c>enif_inspect_binary</c> in a - different environment.</p> - <p> - Own Id: OTP-14931</p> - </item> - <item> - <p>Fixed a crash when <c>enif_make_binary</c> is called - more than once with a binary that had previously been - added to an <c>enif_ioq</c>.</p> - <p> - Own Id: OTP-14932</p> - </item> - <item> - <p> - The erl_child_setup program now ignores SIGTERM signals.</p> - <p> - Own Id: OTP-14943 Aux Id: ERL-576 </p> - </item> - <item> - <p> - Force 64-bit alignment on pre-allocators on architectures - which needs it.</p> - <p> - Own Id: OTP-14977</p> - </item> - <item> - <p> - Fixed a bug where dirty scheduler picked up non-dirty - work.</p> - <p> - Own Id: OTP-14978</p> - </item> - <item> - <p> - Calls to gen_tcp:send/2 on closed sockets now returns - <c>{error, closed}</c> instead of - <c>{error,enotconn}</c>.</p> - <p> - Own Id: OTP-15001</p> - </item> - <item> - <p> - <c>erlang:monotonic_time/1</c> failed with <c>badarg</c> - when passing the <c>perf_counter</c> time unit as - argument.</p> - <p> - Own Id: OTP-15008</p> - </item> - <item> - <p> - Fix bug where rapid <c>init:restart()</c> calls would - sometimes crash because a code load request leaked in - between the restarts.</p> - <p> - Own Id: OTP-15013</p> - </item> - <item> - <p> - Improve <c>float_to_list(F, [{decimals,D}])</c> to closer - conform with <c>io_lib:format("~.*f", [D,F])</c>.</p> - <p> - There are however, still cases when <c>float_to_list</c> - does not produce the exact same result as - <c>io_lib:format</c>, especially for large values - <c>F</c> and/or many decimals <c>D</c>.</p> - <p> - Own Id: OTP-15015 Aux Id: OTP-14890 </p> - </item> - <item> - <p>Fixed a deadlock that would occur on certain - allocators when a reallocation failed with <c>+ramv</c> - enabled.</p> - <p> - Own Id: OTP-15024</p> - </item> - <item> - <p> - Fix bug that made it impossible to use an erl_tracer as - the seq_trace trace receiver.</p> - <p> - Own Id: OTP-15029</p> - </item> - <item> - <p> - Fix bug where a large (> 1 GB) emulator generated error - logger message would cause the emulator to crash.</p> - <p> - Own Id: OTP-15032</p> - </item> - </list> - </section> - - - <section><title>Improvements and New Features</title> - <list> - <item> - <p>It is now possible to open device files and FIFOs with - <c>file:open/2</c>.</p> - <p> - Own Id: OTP-11462</p> - </item> - <item> - <p> - The erlang:system_flag(scheduler_wall_time,Bool) call is - now reference counted and will be turned off if the - (last) process that started the performance statistics - dies. Thus it is no longer possible to start the - statistics with rpc:call(Node, erlang, system_flag, - [scheduler_wall_time, true]) since it will be turned off - directly afterwards when the rpc process dies.</p> - <p> - *** POTENTIAL INCOMPATIBILITY ***</p> - <p> - Own Id: OTP-11694</p> - </item> - <item> - <p> - A new logging API is added to OTP. This is implemented in - the Kernel application, module logger.</p> - <p> - Legacy calls to error_logger will be automatically - redirected to the new API.</p> - <p> - See the reference manual for module logger, and the - User's Guide for the Kernel application for more - information.</p> - <p> - Own Id: OTP-13295</p> - </item> - <item> - <p> - <c>gen_sctp:connect_init/4</c> or rather connect in - <c>inet_drv.c</c> for SCTP has been fixed to not check - the write file descriptor for writeability after a - connect, since for SCTP (SOCK_SEQPACKET) that property - does not seem to be any kind of indicator for when a - connect has finished. This fixes connects that the OS - returned as "in progress" that was misinterpreted by - <c>gen_sctp:connect_init</c> as failed.</p> - <p> - Own Id: OTP-13760 Aux Id: PR-1592 </p> - </item> - <item> - <p>The file driver has been rewritten as a NIF, - decreasing the latency of file operations. Two notable - incompatibilities are:</p> <list> <item><p>The - <c>use_threads</c> option for <c>file:sendfile/5</c> no - longer has any effect; we either use non-blocking - <c>sendfile(2)</c> or fall back to <c>file:read</c> + - <c>gen_tcp:send</c>. </p></item> <item><p>The - file-specific DTrace probes have been removed. The same - effect can be achieved with normal tracing together with - the <c>nif__entry</c>/<c>nif__return</c> probes to track - scheduling.</p></item> </list> - <p> - *** POTENTIAL INCOMPATIBILITY ***</p> - <p> - Own Id: OTP-14256</p> - </item> - <item> - <p>The I/O polling functionality of erts has been - re-written to better make use of the OSs polling - mechanisms. This change means that erts will now always - prefer to use a kernel-polling mechanism if possible. - Also all of the I/O polling has been moved to dedicated - threads instead of being placed in the scheduler - loops.</p> <p>As a result of this, the <c>erl</c> options - <c>+K</c> and <c>+secio</c> have been removed. It is - still possible to disable kernel-poll, but it has to be - done at compile time through the configure option - <c>--disable-kernel-poll</c>.</p> <p>The new <c>erl</c> - options <seealso marker="erl#+IOt"><c>+IOt</c></seealso> - and <seealso marker="erl#+IOp"><c>+IOp</c></seealso> can - be used to change how many IO poll threads and poll sets - that erts should use. See their respective documentation - for more details.</p> - <p> - Own Id: OTP-14346</p> - </item> - <item> - <p>Truly asynchronous auto-connect. Earlier, when - <c>erlang:send</c> was done toward an unconnected node, - the function would not return until the connection setup - had completed (or failed). Now the function returns - directly after the signal has been enqueued and the - connection setup started.</p> - <p>The same applies to all distributed operations that - may trigger auto-connect, i.e. <c>'!'</c>, <c>send</c>, - <c>link</c>, <c>monitor</c>, <c>monitor_node</c>, - <c>exit/2</c> and <c>group_leader</c>.</p> - <p>The interface for all these functions are unchanged as - they do not return connection failures. The only - exception is <c>erlang:monitor</c> where a <em>possible - incompatibility</em> is introduced: An attempt to monitor - a process on a primitive node (such as erl_interface or - jinterface), where remote process monitoring is not - implemented, will no longer fail with <c>badarg</c> - exception. Instead a monitor will be created, but it will - only supervise the connection to the node.</p> - <p> - *** POTENTIAL INCOMPATIBILITY ***</p> - <p> - Own Id: OTP-14370</p> - </item> - <item> - <p>Changed the default behaviour of <c>.erlang</c> - loading: <c>.erlang</c> is no longer loaded from the - current directory. <c>c:erlangrc(PathList)</c> can be - used to search and load an <c>.erlang</c> file from user - specified directories.</p> <p><c>escript</c>, - <c>erlc</c>, <c>dialyzer</c> and <c>typer</c> no longer - load an <c>.erlang</c> at all.</p> - <p> - *** POTENTIAL INCOMPATIBILITY ***</p> - <p> - Own Id: OTP-14439</p> - </item> - <item> - <p> - New functionality for implementation of alternative - carriers for the Erlang distribution has been introduced. - This mainly consists of support for usage of distribution - controller processes (previously only ports could be used - as distribution controllers). For more information see - <seealso marker="erts:alt_dist#distribution_module">ERTS - User's Guide ➜ How to implement an Alternative Carrier - for the Erlang Distribution ➜ Distribution - Module</seealso>.</p> - <p> - Own Id: OTP-14459</p> - </item> - <item> - <p> - Add support for the lcc compiler and in extension the - Elbrus 2000 platform.</p> - <p> - Own Id: OTP-14492</p> - </item> - <item> - <p>Support for "tuple calls" have been removed from the - run-time system. Tuple calls was an undocumented and - unsupported feature which allowed the module argument for - an apply operation to be a tuple: <c>Var = dict:new(), - Var:size()</c>. This "feature" frequently caused - confuses, especially when such call failed. The - stacktrace would point out functions that don't exist in - the source code.</p> - <p>For legacy code that need to use parameterized modules - or tuple calls for some other reason, there is a new - compiler option called <c>tuple_calls</c>. When this - option is given, the compiler will generate extra code - that emulates the old behavior for calls where the module - is a variable.</p> - <p> - *** POTENTIAL INCOMPATIBILITY ***</p> - <p> - Own Id: OTP-14497</p> - </item> - <item> - <p>Creation of small maps with literal keys has been - optimized to be faster and potentially use less memory . - The keys are combined into a literal key tuple which is - put into the literal pool. The key tuple can be shared - between many instances of maps having the same keys.</p> - <p> - Own Id: OTP-14502</p> - </item> - <item> - <p> - When an exception is thrown, include the arguments of the - call in the stacktrace for BIFs <c>band</c>, <c>bor</c>, - <c>bsl</c>, <c>bsr</c>, <c>bxor</c>, <c>div</c>, - <c>rem</c> and the operators <c>+</c>, <c>-</c>, <c>*</c> - and <c>/</c>.</p> - <p> - *** POTENTIAL INCOMPATIBILITY ***</p> - <p> - Own Id: OTP-14508</p> - </item> - <item> - <p> - The non-smp emulators have been removed. This means that - the configure options <c>--disable-threads</c> and - <c>--enable-plain-emulator</c> have been removed and - configure will now refuse to build Erlang/OTP on - platforms without thread support.</p> - <p> - In order to achieve a similar setup as the non-smp - emulator, it is possible to start Erlang/OTP with the - <c>+S 1</c> option.</p> - <p> - *** POTENTIAL INCOMPATIBILITY ***</p> - <p> - Own Id: OTP-14518</p> - </item> - <item> - <p>Modules that use floating point constants compiled - with R15 or earlier will need to be re-compiled before - they can be loaded.</p> - <p> - Own Id: OTP-14575</p> - </item> - <item> - <p> - Implementation of true asynchronous signaling between - processes in order to improve scalability. Signals - affected include exit, monitor, demonitor, monitor - triggered, link, unlink, and group leader.</p> - <p> - Own Id: OTP-14589</p> - </item> - <item> - <p> - Added a PGO (profile guided optimization) pass to the - build step of erts. This can be disabled by passing - --disable-pgo to configure.</p> - <p> - Own Id: OTP-14604</p> - </item> - <item> - <p> - Improved the performance of <c>binary:split</c> and - <c>binary:match</c>.</p> - <p> - Own Id: OTP-14610 Aux Id: PR-1480 </p> - </item> - <item> - <p> - It is not longer possible to disable dirty schedulers - when building erlang.</p> - <p> - Own Id: OTP-14613</p> - </item> - <item> - <p>Loaded BEAM code in a 64-bit system requires less - memory because of better packing of operands for - instructions.</p> - <p>These memory savings were achieved by major - improvements to the <c>beam_makeops</c> scripts used when - building the run time system and BEAM compiler. There is - also new for documentation for <c>beam_makeops</c> that - describes how new BEAM instructions and loader - transformations can be implemented. The documentation is - found in here in a source directory or git repository: - erts/emulator/internal_doc/beam_makeops.md. An online - version can be found here: - https://github.com/erlang/otp/blob/master/erts/emulator/internal_doc/beam_makeops.md</p> - <p> - Own Id: OTP-14626</p> - </item> - <item> - <p><c>file:read_file</c> has been changed to read the - content of files that report a size of 0 even when data - can be read from them. An example of such a file is - /proc/cpuinfo on Linux.</p> - <p> - Own Id: OTP-14637 Aux Id: ERL-327 PR-1524 </p> - </item> - <item> - <p> - It is no longer possible to disable the temp_alloc - allocator. Disabling it caused serious performance - degradations and was never what was wanted.</p> - <p> - Own Id: OTP-14651</p> - </item> - <item> - <p>The reduction cost of sending messages is now - constant. It will no longer scale according to the length - of the receiving process' message queue.</p> - <p> - Own Id: OTP-14667</p> - </item> - <item> - <p> - Improved loading of modules with <c>-on_load</c> - directive, to no longer block all schedulers when the - load operation is completed.</p> - <p> - Own Id: OTP-14680</p> - </item> - <item> - <p> - On platforms with real-time signals available, SIGRTMIN+1 - is now used as the internal scheduler suspend signal - instead of SIGUSR2.</p> - <p> - Own Id: OTP-14682</p> - </item> - <item> - <p>When the value returned from a '<c>catch</c>' - expression is ignored, no stacktrace will be built if an - exception is caught. That will save time and produce less - garbage. There are also some minor optimizations of - '<c>try</c>/<c>catch</c>' both in the compiler and - run-time system.</p> - <p> - Own Id: OTP-14683</p> - </item> - <item> - <p>The guarantees and non-guarantees of - <c>erlang:get_stacktrace/0</c> are now documented.</p> - <p> - Own Id: OTP-14687</p> - </item> - <item> - <p>There is a new syntax in '<c>try/catch</c>' for - retrieving the stacktrace without calling - '<c>erlang:get_stacktrace/0</c>'. See the reference - manual for a description of the new syntax. The - '<c>erlang:get_stacktrace/0</c>' BIF is now - deprecated.</p> - <p> - Own Id: OTP-14692</p> - </item> - <item> - <p> - New 'used' option for <c>binary_to_term/2</c> that will - also return number of bytes actually read from the - binary. This enables easy access to any extra data in the - binary located directly after the returned term.</p> - <p> - Own Id: OTP-14780</p> - </item> - <item> - <p> - Added more statistics for - <c>erlang:system_info({allocator,A})</c> in the - <c>mbcs_pool</c> section.</p> - <p> - Own Id: OTP-14795 Aux Id: ERL-88 </p> - </item> - <item> - <p>Added <c>enif_ioq_peek_head</c> to allow retrieving - Erlang terms from NIF IO queues without having to resort - to copying.</p> - <p> - Own Id: OTP-14797</p> - </item> - <item> - <p>There is a new option '<c>makedep_side_effect</c>' for - the compiler and <c>-MMD</c> for '<c>erlc</c>' that - generates dependencies and continues to compile as - normal.</p> - <p> - Own Id: OTP-14830</p> - </item> - <item> - <p>Added <c>ets:whereis/1</c> for retrieving the table - identifier of a named table.</p> - <p> - Own Id: OTP-14884</p> - </item> - <item> - <p><c>seq_trace</c> labels may now be any erlang - term.</p> - <p> - Own Id: OTP-14899</p> - </item> - <item> - <p> - Optimized the common case of <c>monitor</c> followed by - <c>send</c> to the same local process. The monitor signal - is now delayed in order to be piggybacked with the sent - message and thereby only get one lock operation on the - message queue of the receiver. A delayed monitor signal - is flushed if no <c>send</c> has been done at the latest - when the process is scheduled out.</p> - <p> - Own Id: OTP-14901</p> - </item> - <item> - <p> - Make hipe compiled code work on x86_64 (amd64) with OS - security feature PIE, where executable code can be loaded - into a random location. Old behavior, if hipe was - enabled, was to disable PIE build options for the VM.</p> - <p> - Own Id: OTP-14903</p> - </item> - <item> - <p>The number of driver async threads will now default to - 1 as the standard drivers do not use them anymore. Users - that changed this value to tweak the file driver should - replace <c>+A</c> with <c>+SDio</c> since it now uses - dirty IO schedulers instead of async threads.</p> - <p> - *** POTENTIAL INCOMPATIBILITY ***</p> - <p> - Own Id: OTP-14928</p> - </item> - <item> - <p> - Optimize <c>==</c> and <c>/=</c> for binaries with - different sizes to be constant in time instead of - proportional to the size of their common prefix.</p> - <p> - Own Id: OTP-14934 Aux Id: PR-1708 </p> - </item> - <item> - <p> - Refactorings making some internal process flags available - for other usage.</p> - <p> - Own Id: OTP-14948</p> - </item> - <item> - <p> - Removed need for HiPE to allocate native executable - memory in low 2GB address space on x86_64. Command line - option <c>+MXscs</c> is thereby obsolete and ignored.</p> - <p> - Own Id: OTP-14951</p> - </item> - <item> - <p>Added <c>enif_make_map_from_arrays</c> for creating a - populated map, analogous to - <c>enif_make_list_from_array</c>.</p> - <p> - Own Id: OTP-14954</p> - </item> - <item> - <p>Added configuration switches for busy-wait and wake up - thresholds for dirty schedulers, and changing these - settings for normal schedulers will no longer affect - dirty schedulers. </p> <p>Refer to the documentation for - details. The new switches are <seealso - marker="erl#+sbwtdcpu">+sbwtdcpu</seealso>, <seealso - marker="erl#+sbwtdio">+sbwtdio</seealso>, <seealso - marker="erl#+swtdcpu">+swtdcpu</seealso>, and <seealso - marker="erl#+swtdio">+swtdio</seealso>.</p> <p>The - default busy wait threshold for dirty scheduler threads - has also been lowered to <c>short</c>.</p> - <p> - Own Id: OTP-14959</p> - </item> - <item> - <p> - The list of "taints" now also includes dynamic loaded - drivers in addition to NIF libraries. Statically linked - drivers and NIF libraries that are part of erts are not - included. The "taints" are returned by - <c>system_info(taints)</c> and printed in the header of - <c>erl_crash.dump</c> files.</p> - <p> - Own Id: OTP-14960</p> - </item> - <item> - <p>Added <c>instrument:allocations</c> and - <c>instrument:carriers</c> for retrieving information - about memory utilization and fragmentation.</p> - <p>The old <c>instrument</c> interface has been removed, - as have the related options <c>+Mim</c> and - <c>+Mis</c>.</p> - <p> - *** POTENTIAL INCOMPATIBILITY ***</p> - <p> - Own Id: OTP-14961</p> - </item> - <item> - <p>Added the <c>nifs</c> option to - <c>?MODULE:module_info/1</c> for listing a module's - installed NIF functions.</p> - <p> - Own Id: OTP-14965</p> - </item> - <item> - <p> - New implementation of <c>erlang:process_info/[1,2]</c>.</p> - <p> - In the general case when inspecting another process, the - new implementation sends an asynchronous process-info - request signal to the other process and waits for the - result instead of locking the other process and reading - the result directly. In some special cases where no - conflicts occur, signal order wont be violated, and the - amount of data requested is guaranteed to be small, the - inspected process may be inspected directly.</p> - <p> - Appropriate amount of reductions are now also bumped when - inspecting a process.</p> - <p> - Own Id: OTP-14966</p> - </item> - <item> - <p> - Removed process start time from crash dump in order to - save memory in process control block.</p> - <p> - Own Id: OTP-14975 Aux Id: PR-1597 </p> - </item> - <item> - <p> - Optimize <c>erlang:put/2</c> when updating existing key - with a new immediate value (atom, small integer, pid, - port).</p> - <p> - Own Id: OTP-14976</p> - </item> - <item> - <p> - <c>erlang:process_info/1</c> has been changed to no - longer include <c>messages</c> by default. Instead - <c>erlang:process_info/2</c> should be used.</p> - <p> - *** POTENTIAL INCOMPATIBILITY ***</p> - <p> - Own Id: OTP-14986 Aux Id: PR-1745 </p> - </item> - <item> - <p> - New NIF functions: enif_mutex_name, enif_cond_name, - enif_rwlock_name, enif_thread_name, enif_vfprintf, - enif_vsnprintf.</p> - <p> - Own Id: OTP-14994</p> - </item> - <item> - <p>When <c>erlang:system_flag(backtrace_depth, 0)</c> has - been called, all exceptions will now contain the entry - for <em>one</em> function (despite the zero). It used to - be that a hand-made stack backtrace passed to - <c>erlang:raise/3</c> would be be truncated to an empty - list.</p> - <p> - Own Id: OTP-15026</p> - </item> - <item> - <p> - Fixed bug for named <c>ets</c> tables which could cause - unexpected results from matchspec iteration functions - (<c>ets:select*</c> and <c>ets:match*</c>) if the table - was deleted and recreated with the same name during the - iteration. The iteration could incorrectly continue - through the recreated table. The expected correct - behavior is now for the iteration call to fail with a - <c>badarg</c> exception if the table is deleted before - the iteration has completed.</p> - <p> - Own Id: OTP-15031</p> - </item> - <item> - <p>The <c>map_get/2</c> guard BIF has been added. It - works the same way as <c>maps:get/2</c>, except that it - is allowed to use it in guards.</p> - <p> - Own Id: OTP-15037 Aux Id: PR-1784 </p> - </item> - </list> - </section> - -</section> - <section><title>Erts 9.3</title> <section><title>Fixed Bugs and Malfunctions</title> |