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<p>This document describes the changes made to the ERTS application.</p>
+<section><title>Erts 7.3.1</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ <c>process_info(Pid, last_calls)</c> did not work for
+ <c>Pid /= self()</c>.</p>
+ <p>
+ Own Id: OTP-13418</p>
+ </item>
+ <item>
+ <p>
+ Make sure to create a crash dump when running out of
+ memory. This was accidentally removed in the erts-7.3
+ release.</p>
+ <p>
+ Own Id: OTP-13419</p>
+ </item>
+ <item>
+ <p>
+ Schedulers could be woken by a premature timeout on
+ Linux. This premature wakeup was however harmless.</p>
+ <p>
+ Own Id: OTP-13420</p>
+ </item>
+ <item>
+ <p>
+ A process communicating with a port via one of the
+ <c>erlang:port_*</c> BIFs could potentially end up in an
+ inconsistent state if the port terminated during the
+ communication. When this occurred the process could later
+ block in a <c>receive</c> even though it had messages
+ matching in its message queue.</p>
+ <p>
+ This bug was introduced in erts version 5.10 (OTP R16A).</p>
+ <p>
+ Own Id: OTP-13424 Aux Id: OTP-10336 </p>
+ </item>
+ <item>
+ <p>
+ The reference count of a process structure could under
+ rare circumstances be erroneously managed. When this
+ happened invalid memory accesses occurred.</p>
+ <p>
+ Own Id: OTP-13446</p>
+ </item>
+ <item>
+ <p>
+ Fix race between <c>process_flag(trap_exit,true)</c> and
+ a received exit signal.</p>
+ <p>
+ A process could terminate due to exit signal even though
+ <c>process_flag(trap_exit,true)</c> had returned. A very
+ specific timing between call to <c>process_flag/2</c> and
+ exit signal from another scheduler was required for this
+ to happen.</p>
+ <p>
+ Own Id: OTP-13452</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 7.3</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ The '-path' flag to 'erl' has been documented. This flag
+ replaces the path specified in the boot script. It has
+ always existed, but was earlier only documented in SASL
+ (script).</p>
+ <p>
+ Own Id: OTP-13060</p>
+ </item>
+ <item>
+ <p>
+ The <c>call_time</c> tracing functionality internally
+ used a time based on OS system time in order to measure
+ call time which could cause erroneous results if OS
+ system time was changed during tracing.</p>
+ <p>
+ This functionality now use Erlang monotonic time in order
+ to measure time. Besides fixing the erroneous results due
+ to OS system time being used, the results are often also
+ better since Erlang monotonic time often has better
+ accuracy and precision.</p>
+ <p>
+ Own Id: OTP-13216</p>
+ </item>
+ <item>
+ <p>
+ Fix behaviour of -delay_write command line switch of
+ epmd, which is used for debugging - in some cases epmd
+ was sleeping twice the requested amount of time.</p>
+ <p>
+ Own Id: OTP-13220</p>
+ </item>
+ <item>
+ <p>
+ Fix race between timeout and exit signal that could cause
+ a process to ignore the exit signal and continue
+ execution. Bug exist since OTP 18.0.</p>
+ <p>
+ Own Id: OTP-13245</p>
+ </item>
+ <item>
+ <p>
+ Fix bug in <c>erlang:halt/1,2</c> for large exit status
+ values, causing either <c>badarg</c> (on 32-bit) or exit
+ with a crash dump and/or core dump (on 64-bit). Make
+ <c>erlang:halt/1,2</c> tolerate any non negative integer
+ as exit status and truncate high order bits if the OS
+ does not support it.</p>
+ <p>
+ Own Id: OTP-13251 Aux Id: ERL-49 </p>
+ </item>
+ <item>
+ <p>
+ <seealso
+ marker="kernel:gen_tcp#accept/2"><c>gen_tcp:accept/2</c></seealso>
+ was not <seealso
+ marker="erts:time_correction#Time_Warp_Safe_Code">time
+ warp safe</seealso>. This since it used the same time as
+ returned by <seealso
+ marker="erts:erlang#now/0"><c>erlang:now/0</c></seealso>
+ when calculating timeout. This has now been fixed.</p>
+ <p>
+ Own Id: OTP-13254 Aux Id: OTP-11997, OTP-13222 </p>
+ </item>
+ <item>
+ <p>
+ Fix faulty error handling when writing to a compressed
+ file.</p>
+ <p>
+ Own Id: OTP-13270</p>
+ </item>
+ <item>
+ <p>
+ Fix sendfile usage for large files on FreeBSD</p>
+ <p>
+ Own Id: OTP-13271</p>
+ </item>
+ <item>
+ <p>
+ Fix bug that could cause
+ <c>process_info(P,current_location)</c> to crash emulator
+ for hipe compiled modules.</p>
+ <p>
+ Own Id: OTP-13282 Aux Id: ERL-79 </p>
+ </item>
+ <item>
+ <p>
+ Out of memory errors have been changed to cause an exit
+ instead of abort.</p>
+ <p>
+ Own Id: OTP-13292</p>
+ </item>
+ <item>
+ <p>
+ When calling <c>garbage_collect/[1,2]</c> or
+ <c>check_process_code/[2,3]</c> from a process with a
+ higher priority than the priority of the process operated
+ on, the run queues could end up in an inconsistent state.
+ This bug has now been fixed.</p>
+ <p>
+ Own Id: OTP-13298 Aux Id: OTP-11388 </p>
+ </item>
+ <item>
+ <p>
+ A workaround for an issue with older gcc versions (less
+ than 5) and inline assembly on 32-bit x86 caused an
+ emulator crash when it had been compiled with a newer gcc
+ version. An improved <c>configure</c> test, run when
+ building OTP, now detects whether the workaround should
+ be used or not.</p>
+ <p>
+ Own Id: OTP-13326 Aux Id: ERL-80 </p>
+ </item>
+ </list>
+ </section>
+
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>Introduced new statistics functionality in order to
+ more efficiently retrieve information about run able and
+ active processes and ports. For more information see:</p>
+ <list> <item><seealso
+ marker="erlang#statistics_total_run_queue_lengths"><c>statistics(total_run_queue_lengths)</c></seealso></item>
+ <item><seealso
+ marker="erlang#statistics_run_queue_lengths"><c>statistics(run_queue_lengths)</c></seealso></item>
+ <item><seealso
+ marker="erlang#statistics_total_active_tasks"><c>statistics(total_active_tasks)</c></seealso></item>
+ <item><seealso
+ marker="erlang#statistics_active_tasks"><c>statistics(active_tasks)</c></seealso></item>
+ </list>
+ <p>
+ Own Id: OTP-13201</p>
+ </item>
+ <item>
+ <p>
+ Time warp safety improvements.</p>
+ <p>
+ Introduced the options <c>monotonic_timestamp</c>, and
+ <c>strict_monotonic_timestamp</c> to the trace,
+ sequential trace, and system profile functionality. This
+ since the already existing <c>timestamp</c> option is not
+ time warp safe.</p>
+ <p>
+ Introduced the option <c>safe_fixed_monotonic_time</c> to
+ <c>ets:info/2</c> and <c>dets:info/2</c>. This since the
+ already existing <c>safe_fixed</c> option is not time
+ warp safe.</p>
+ <p>
+ Own Id: OTP-13222 Aux Id: OTP-11997 </p>
+ </item>
+ <item>
+ <p>
+ Fix a register race where down nodes goes undetected in
+ epmd</p>
+ <p>
+ Own Id: OTP-13301</p>
+ </item>
+ <item>
+ <p>
+ Improved the gcc inline assembly implementing double word
+ atomic compare and exchange on x86/x86_64 so that it also
+ can be used when compiling with clang.</p>
+ <p>
+ Own Id: OTP-13336</p>
+ </item>
+ <item>
+ <p>
+ An optimization preventing a long wait for a scheduler
+ thread looking up information about a process executing
+ on another scheduler thread had unintentionally been lost
+ in erts-5.10 (OTP R16A). This optimization has now been
+ reintroduced.</p>
+ <p>
+ Own Id: OTP-13365 Aux Id: OTP-9892 </p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
<section><title>Erts 7.2.1</title>
<section><title>Fixed Bugs and Malfunctions</title>