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diff --git a/erts/doc/src/notes.xml b/erts/doc/src/notes.xml index 2d396236cf..2c23456ff1 100644 --- a/erts/doc/src/notes.xml +++ b/erts/doc/src/notes.xml @@ -31,6 +31,526 @@ </header> <p>This document describes the changes made to the ERTS application.</p> +<section><title>Erts 10.2.3</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Fix bug where doing a <c>gen_tcp:send</c> on a socket + with <c>delay_send</c> set to true could cause a segfault + if the other side closes the connection.</p> + <p> + Bug was introduced in erts-10.2 (OTP-21.2).</p> + <p> + Own Id: OTP-15536 Aux Id: ERL-827 </p> + </item> + <item> + <p> + Fix a race condition when a port program closes that + could result in the next started port to hang during + startup.</p> + <p> + When this fault happens the following error is normally + (but not always) logged:</p> + <p> + <c> =ERROR REPORT==== 14-Jan-2019::10:45:52.868246 + ===</c><br/><c> Bad input fd in erts_poll()! fd=11, + port=#Port<0.505>, driver=spawn, name=/bin/sh -s + unix:cmd </c></p> + <p> + Bug was introduced in erts-10.0 (OTP-21.0).</p> + <p> + Own Id: OTP-15537</p> + </item> + <item> + <p> + Fix a bug where polling for external events could be + delayed for a very long time if all active schedulers + were 100% loaded.</p> + <p> + Bug was introduced in erts-10.2 (OTP-21.2).</p> + <p> + Own Id: OTP-15538 Aux Id: ERIERL-229 </p> + </item> + </list> + </section> + +</section> + +<section><title>Erts 10.2.2</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p>Fixed a crash when dangling files were closed after + <c>init:restart/0</c>.</p> + <p> + Own Id: OTP-15495 Aux Id: ERL-821 </p> + </item> + <item> + <p> + A bug that could cause dirty schedulers to become + unresponsive has been fixed.</p> + <p> + Own Id: OTP-15509 Aux Id: PR-2027, PR-2093 </p> + </item> + </list> + </section> + +</section> + +<section><title>Erts 10.2.1</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Fixed bug on big endian architectures when changing file + permissions or ownership with <c>file:change_mode</c>, + <c>change_owner</c>, <c>change_group</c> or + <c>write_file_info</c>. Bug exists since OTP-21.0.</p> + <p> + Own Id: OTP-15485</p> + </item> + <item> + <p> + Fixed bug in <c>atomics</c> with option + <c>{signed,false}</c> when returned values are <c>(1 bsl + 63)</c> or larger. Could cause heap corruption leading to + VM crash or other unpleasant symptoms. Bug exists since + OTP-21.2 when module <c>atomics</c> was introduced.</p> + <p> + Own Id: OTP-15486 Aux Id: PR-2061 </p> + </item> + <item> + <p> + Fixed bug in operator <c>band</c> of two negative + operands causing erroneous result if the absolute value + of one of the operands have the lowest <c>N*W</c> bits as + zero and the other absolute value is not larger than + <c>N*W</c> bits. <c>N</c> is an integer of 1 or larger + and <c>W</c> is 32 or 64 depending on word size.</p> + <p> + Own Id: OTP-15487 Aux Id: ERL-804 </p> + </item> + </list> + </section> + +</section> + +<section><title>Erts 10.2</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + When a process was waiting for a TCP socket send + operation to complete, and another process closed the + socket during that send, the sending process could hang. + This bug has now been corrected.</p> + <p> + Own Id: OTP-12242 Aux Id: ERL-561 </p> + </item> + <item> + <p> + Document <c>bit_size</c> in match specifications and + allow it in <c>ets:fun2ms</c>.</p> + <p> + Own Id: OTP-15343 Aux Id: PR-1962 </p> + </item> + <item> + <p> + Fixed bug in <c>ets:select_replace</c> when called with a + fully bound key could cause a following call to + <c>ets:next</c> or <c>ets:prev</c> to crash the emulator + or return invalid result.</p> + <p> + Own Id: OTP-15346</p> + </item> + <item> + <p>When a module has been purged from memory, any + literals belonging to that module will be copied to all + processes that hold references to them. The max heap size + limit would be ignored in the garbage collection + initiated when copying literals to a process. If the max + heap size was exceeded, the process would typically be + terminated in the following garbage collection. Corrected + to terminate the process directly if copying a literal + would exceed the max heap size.</p> + <p> + Own Id: OTP-15360</p> + </item> + <item> + <p> + Fix compilation of run_erl on Solaris 11.4 and later.</p> + <p> + Own Id: OTP-15389</p> + </item> + <item> + <p>Fixed a bug where <c>lists:reverse/1-2</c> could use + far too many reductions. This bug was introduced in + <c>OTP 21.1</c>.</p> + <p> + Own Id: OTP-15436</p> + </item> + <item> + <p>Fixed a bug where a dirty scheduler could stay awake + forever if a distribution entry was removed as part of a + dirty GC.</p> + <p> + Own Id: OTP-15446 Aux Id: PR-2024 </p> + </item> + <item> + <p> + Fix microstate accounting handing in various places. Most + importantly the GC states when the GC is run on a dirty + scheduler are now managed correctly.</p> + <p> + Own Id: OTP-15450 Aux Id: ERIERL-229 </p> + </item> + <item> + <p> + Fixed bug in <c>file:sendfile</c> when the send operation + failed. For sockets in <c>active</c> modes it could cause + emulator crash or a hanging call. For sockets with + <c>{active,false}</c> an unexpected <c>{inet_reply, _, + _}</c> message could be sent to the calling process. The + bug exists since OTP-21.0.</p> + <p> + Own Id: OTP-15461 Aux Id: ERL-784 </p> + </item> + <item> + <p> + The erts configure script has been updated to reject any + CFLAGS that does not have <c>-O</c>. This in order to + prevent the common mistake of forgetting to add + <c>-O2</c> to custom CFLAGS.</p> + <p> + Own Id: OTP-15465</p> + </item> + <item> + <p> + Fix reduction count in lists:member/2</p> + <p> + Own Id: OTP-15474 Aux Id: ERIERL-229 </p> + </item> + </list> + </section> + + + <section><title>Improvements and New Features</title> + <list> + <item> + <p> + New <c>counters</c> and <c>atomics</c> modules supplies + access to highly efficient operations on mutable fixed + word sized variables.</p> + <p> + Own Id: OTP-13468</p> + </item> + <item> + <p>There is a new module <c>persistent_term</c> that + implements a term storage suitable for terms that are + frequently used but never or infrequently updated. + Lookups are done in constant time without copying the + terms.</p> + <p> + Own Id: OTP-14669 Aux Id: PR-1989 </p> + </item> + <item> + <p> + A function <c>inet:getifaddrs/1</c> that takes a list + with a namespace option has been added, for platforms + that support that feature, for example Linux (only?).</p> + <p> + Own Id: OTP-15121 Aux Id: ERIERL-189, PR-1974 </p> + </item> + <item> + <p>Added the <c>nopush</c> option for TCP sockets, which + corresponds to <c>TCP_NOPUSH</c> on *BSD and + <c>TCP_CORK</c> on Linux.</p> + <p>This is also used internally in <c>file:sendfile</c> + to reduce latency on subsequent send operations.</p> + <p> + Own Id: OTP-15357 Aux Id: ERL-698 </p> + </item> + <item> + <p>List subtraction (The <c>--</c> operator) will now + yield properly on large inputs.</p> + <p> + Own Id: OTP-15371</p> + </item> + <item> + <p> + Optimize handling of send_delay for tcp sockes to better + work with the new pollthread implementation introduced in + OTP-21.</p> + <p> + Own Id: OTP-15471 Aux Id: ERIERL-229 </p> + </item> + <item> + <p> + Optimize driver_set_timer with a zero timeout to + short-circuit and not create any timer structure, but + instead schedule the timer immediately.</p> + <p> + Own Id: OTP-15472 Aux Id: ERIERL-229 </p> + </item> + <item> + <p> + Add <c>erl_xcomp_code_model_small</c> as a cross + configure variable in order to let the emulator be build + with the assumption that a small code model will be used + on the target machine.</p> + <p> + Own Id: OTP-15473 Aux Id: ERIERL-229 </p> + </item> + <item> + <p> + Add a new pollset that is made to handle sockets that use + <c>{active, true}</c> or <c>{active, N}</c>. The new + pollset will not be polled by a pollthread, but instead + polled by a normal scheduler.</p> + <p> + This change was made because of the overhead associated + with constantly having to re-apply the ONESHOT mechanism + on fds that all input events were interesting.</p> + <p> + The new pollset is only active on platforms that support + concurrent kernel poll updates, i.e. Linux and BSD.</p> + <p> + Own Id: OTP-15475 Aux Id: ERIERL-229 </p> + </item> + <item> + <p> + Fix bug where emulator would segfault if a literal + message was sent when sequence tracing was enabled.</p> + <p> + Own Id: OTP-15478 Aux Id: ERL-741 </p> + </item> + </list> + </section> + +</section> + +<section><title>Erts 10.1.3</title> + + <section><title>Improvements and New Features</title> + <list> + <item> + <p>Added an optional <c>./configure</c> flag to compile + the emulator with spectre mitigation: + <c>--with-spectre-mitigation</c></p> + <p>Note that this requires a recent version of GCC with + support for spectre mitigation and the + <c>--mindirect-branch=thunk</c> flag, such as + <c>8.1</c>.</p> + <p> + Own Id: OTP-15430 Aux Id: ERIERL-237 </p> + </item> + </list> + </section> + +</section> + +<section><title>Erts 10.1.2</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p>Fixed a rare bug where files could be closed on a + normal instead of an IO scheduler, resulting in system + instability if the operation blocked.</p> + <p> + Own Id: OTP-15421</p> + </item> + </list> + </section> + +</section> + +<section><title>Erts 10.1.1</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + A bug where the socket option 'pktoptions' caused a read + of uninitialized memory has been fixed. Would cause + malfunction on FreeBSD.</p> + <p> + Own Id: OTP-14297 Aux Id: OTP-15141 </p> + </item> + <item> + <p>Fixed a memory leak on errors when reading files.</p> + <p> + Own Id: OTP-15318</p> + </item> + <item> + <p>File access through UNC paths works again on Windows. + This regression was introduced in OTP 21.</p> + <p> + Own Id: OTP-15333 Aux Id: ERL-737 </p> + </item> + </list> + </section> + +</section> + +<section><title>Erts 10.1</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Fix the seq_trace token to not be cleared when a process + receives messages sent by erts. Some examples of when + this could happen is all port BIFs, i.e. + <c>open_port</c>, <c>port_command</c> etc etc.</p> + <p> + Fix so that messages sent by nifs can be traced using + normal and <c>seq_trace</c> tracing.</p> + <p> + Own Id: OTP-15038 Aux Id: ERL-602 </p> + </item> + <item> + <p> + Fixed specs and documentation for <c>process_info</c> + item <c>monitored_by</c> to include port identifiers and + nif resources as possible types.</p> + <p> + Own Id: OTP-15180 Aux Id: ERL-648 </p> + </item> + <item> + <p> + Fix bug in generation of erl_crash.dump, which could + cause VM to crash.</p> + <p> + Bug exist since erts-9.2 (OTP-20.2).</p> + <p> + Own Id: OTP-15181</p> + </item> + <item> + <p> + Fix bug where ctrl-break or ctrl-c would not trigger the + break mode properly on Windows. This bug was introduced + in erts-10.0 (OTP-21).</p> + <p> + Own Id: OTP-15205</p> + </item> + <item> + <p> + Fix a performance bug for reception of UDP packages, + where a memory buffer would be reallocated when it should + not have been.</p> + <p> + Introduce a limit on the maximum automatic increase of + the UDP user-space buffer to the theoretical max of the + network PATH, i.e. 65535.</p> + <p> + Own Id: OTP-15206</p> + </item> + <item> + <p> + Fix alignment of erts allocator state internally in erts. + With the improper alignment the emulator would refuse to + start when compiled with clang on 32-bit systems.</p> + <p> + Own Id: OTP-15208 Aux Id: PR-1897 ERL-677 </p> + </item> + <item> + <p> + Fix bug where too many concurrent calls to + <c>erlang:open_port({spawn,"cmd"},...)</c> would result + in the emulator terminating with the reason "Failed to + write to erl_child_setup: ". After this fix the + <c>open_port</c> call will throw an <c>emfile</c> + exception instead.</p> + <p> + Own Id: OTP-15210</p> + </item> + <item> + <p> + Upgraded the ERTS internal PCRE library from version 8.41 + to version 8.42. See <url + href="http://pcre.org/original/changelog.txt">http://pcre.org/original/changelog.txt</url> + for information about changes made to PCRE. This library + implements major parts of the <seealso + marker="stdlib:re"><c>re</c></seealso> regular + expressions module.</p> + <p> + Own Id: OTP-15217</p> + </item> + <item> + <p> + Fix <c>open_port({fd,X,Y}, ...)</c> to release the file + descriptors from the pollset when closing the port. + Without this fix the same file descriptor number could + not be reused when doing multiple open_port and + port_close sequences.</p> + <p> + Own Id: OTP-15236 Aux Id: ERL-692 </p> + </item> + <item> + <p> + Fixed bug in <c>float_to_list/2</c> and + <c>float_to_binary/2</c> with options + <c>[{decimals,0},compact]</c> causing totally wrong + results. Bug exists since OTP-21.0.</p> + <p> + Own Id: OTP-15276 Aux Id: PR-1920 </p> + </item> + <item> + <p> + Fixed bug in <c>erlang:memory</c> causing <c>ets</c> to + report too much. This small false memory leak (16 bytes + each time) can only happen when a specific race condition + occurs between scheduler threads on a table with option + <c>write_concurrency</c>.</p> + <p> + Own Id: OTP-15278</p> + </item> + <item> + <p> + Minor <c>configure</c> test fixes</p> + <p> + Own Id: OTP-15282</p> + </item> + <item> + <p> + Improved robustness of distribution connection setup. In + OTP-21.0 a truly asynchronous connection setup was + introduced. This is further improvement on that work to + make the emulator more robust and also be able to recover + in cases when involved Erlang processes misbehave.</p> + <p> + Own Id: OTP-15297 Aux Id: OTP-15279, OTP-15280 </p> + </item> + </list> + </section> + + + <section><title>Improvements and New Features</title> + <list> + <item> + <p> + The socket options <c>recvtos</c>, <c>recvttl</c>, + <c>recvtclass</c> and <c>pktoptions</c> have been + implemented in the socket modules. See the documentation + for the <c>gen_tcp</c>, <c>gen_udp</c> and <c>inet</c> + modules. Note that support for these in the runtime + system is platform dependent. Especially for + <c>pktoptions</c> which is very Linux specific and + obsoleted by the RFCs that defined it.</p> + <p> + Own Id: OTP-15145 Aux Id: ERIERL-187 </p> + </item> + </list> + </section> + +</section> + <section><title>Erts 10.0.8</title> <section><title>Fixed Bugs and Malfunctions</title> @@ -1174,6 +1694,99 @@ </section> +<section><title>Erts 9.3.3.8</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + A bug that could cause dirty schedulers to become + unresponsive has been fixed.</p> + <p> + Own Id: OTP-15509 Aux Id: PR-2027, PR-2093 </p> + </item> + </list> + </section> + +</section> + +<section><title>Erts 9.3.3.7</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Fixed bug in operator <c>band</c> of two negative + operands causing erroneous result if the absolute value + of one of the operands have the lowest <c>N*W</c> bits as + zero and the other absolute value is not larger than + <c>N*W</c> bits. <c>N</c> is an integer of 1 or larger + and <c>W</c> is 32 or 64 depending on word size.</p> + <p> + Own Id: OTP-15487 Aux Id: ERL-804 </p> + </item> + </list> + </section> + +</section> + +<section><title>Erts 9.3.3.6</title> + + <section><title>Improvements and New Features</title> + <list> + <item> + <p>List subtraction (The <c>--</c> operator) will now + yield properly on large inputs.</p> + <p> + Own Id: OTP-15371</p> + </item> + </list> + </section> + +</section> + +<section><title>Erts 9.3.3.5</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + ERTS internal trees of monitor structures could get into + an inconsistent state. This could cause <c>'DOWN'</c> + messages not to be delivered when they should, as well as + delivery of <c>'DOWN'</c> messages that should not be + delivered.</p> + <p> + This bug was introduced in ERTS version 9.0 (OTP 20.0) + and was fixed in ERTS version 10.0 (OTP 21.0) due to a + rewrite of the monitor code. That is, this bug only exist + in the OTP 20 release.</p> + <p> + Own Id: OTP-15399 Aux Id: ERL-751, ERIERL-262, OTP-14205 </p> + </item> + </list> + </section> + +</section> + +<section><title>Erts 9.3.3.4</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Fixed bug in <c>ets:select_replace</c> when called with a + fully bound key could cause a following call to + <c>ets:next</c> or <c>ets:prev</c> to crash the emulator + or return invalid result.</p> + <p> + Own Id: OTP-15346</p> + </item> + </list> + </section> + +</section> + <section><title>Erts 9.3.3.3</title> <section><title>Fixed Bugs and Malfunctions</title> @@ -1478,6 +2091,22 @@ </section> +<section><title>Erts 9.2.0.1</title> + + <section><title>Improvements and New Features</title> + <list> + <item> + <p> + Extra internal consistency checks wrt communication with + erl_child_setup process.</p> + <p> + Own Id: OTP-15488 Aux Id: ERIERL-231 </p> + </item> + </list> + </section> + +</section> + <section><title>Erts 9.2</title> <section><title>Fixed Bugs and Malfunctions</title> @@ -2676,6 +3305,59 @@ </section> +<section><title>Erts 8.3.5.7</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Fixed bug in operator <c>band</c> of two negative + operands causing erroneous result if the absolute value + of one of the operands have the lowest <c>N*W</c> bits as + zero and the other absolute value is not larger than + <c>N*W</c> bits. <c>N</c> is an integer of 1 or larger + and <c>W</c> is 32 or 64 depending on word size.</p> + <p> + Own Id: OTP-15487 Aux Id: ERL-804 </p> + </item> + </list> + </section> + + + <section><title>Improvements and New Features</title> + <list> + <item> + <p>Added an optional <c>./configure</c> flag to compile + the emulator with spectre mitigation: + <c>--with-spectre-mitigation</c></p> + <p>Note that this requires a recent version of GCC with + support for spectre mitigation and the + <c>--mindirect-branch=thunk</c> flag, such as + <c>8.1</c>.</p> + <p> + Own Id: OTP-15430 Aux Id: ERIERL-237 </p> + </item> + </list> + </section> + +</section> + +<section><title>Erts 8.3.5.6</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Fixed small memory leak that could occur when sending to + a terminating port.</p> + <p> + Own Id: OTP-14609 Aux Id: ERIERL-238 </p> + </item> + </list> + </section> + +</section> + <section><title>Erts 8.3.5.5</title> <section><title>Fixed Bugs and Malfunctions</title> @@ -4560,6 +5242,37 @@ </section> +<section><title>Erts 7.3.1.6</title> + + <section><title>Improvements and New Features</title> + <list> + <item> + <p>List subtraction (The <c>--</c> operator) will now + yield properly on large inputs.</p> + <p> + Own Id: OTP-15371</p> + </item> + </list> + </section> + +</section> + +<section><title>Erts 7.3.1.5</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Fixed small memory leak that could occur when sending to + a terminating port.</p> + <p> + Own Id: OTP-14609 Aux Id: ERIERL-238 </p> + </item> + </list> + </section> + +</section> + <section><title>Erts 7.3.1.4</title> <section><title>Fixed Bugs and Malfunctions</title> <list> @@ -6052,6 +6765,103 @@ </section> +<section><title>Erts 6.4.1.7</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <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> + Calls to <c>erl_drv_send_term()</c> or + <c>erl_drv_output_term()</c> from a non-scheduler thread + while the corresponding port was invalid caused the + emulator to enter an inconsistent state which eventually + caused an emulator crash.</p> + <p> + Own Id: OTP-13866</p> + </item> + <item> + <p>Driver and NIF operations accessing processes or ports + could cause an emulator crash when used from + non-scheduler threads. Those operations are:</p> <list> + <item><c>erl_drv_send_term()</c></item> + <item><c>driver_send_term()</c></item> + <item><c>erl_drv_output_term()</c></item> + <item><c>driver_output_term()</c></item> + <item><c>enif_send()</c></item> + <item><c>enif_port_command()</c></item> </list> + <p> + Own Id: OTP-13869</p> + </item> + <item> + <p> + Fix bug in <c>binary_to_term</c> for binaries created by + <c>term_to_binary </c> with option <c>compressed</c>. The + bug can cause <c>badarg</c> exception for a valid binary + when Erlang VM is linked against a <c>zlib</c> library of + version 1.2.9 or newer. Bug exists since OTP 17.0.</p> + <p> + Own Id: OTP-14159 Aux Id: ERL-340 </p> + </item> + <item> + <p> + Fixed bug in operator <c>bxor</c> causing erroneuos + result when one operand is a big <em>negative</em> + integer with the lowest <c>N*W</c> bits as zero and the + other operand not larger than <c>N*W</c> bits. <c>N</c> + is an integer of 1 or larger and <c>W</c> is 32 or 64 + depending on word size.</p> + <p> + Own Id: OTP-14514</p> + </item> + <item> + <p> + Fixed bug in <c>binary_to_term</c> and + <c>binary_to_atom</c> that could cause VM crash. + Typically happens when the last character of an UTF8 + string is in the range 128 to 255, but truncated to only + one byte. Bug exists in <c>binary_to_term</c> since ERTS + version 5.10.2 (OTP_R16B01) and <c>binary_to_atom</c> + since ERTS version 9.0 (OTP-20.0).</p> + <p> + Own Id: OTP-14590 Aux Id: ERL-474 </p> + </item> + </list> + </section> + +</section> + +<section><title>Erts 6.4.1.6</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <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> + </list> + </section> + +</section> + <section><title>Erts 6.4.1.5</title> <section><title>Fixed Bugs and Malfunctions</title> @@ -18878,4 +19688,3 @@ </section> </section> </chapter> - |