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2019-02-14Prepare releaseErlang/OTP
2019-02-14Merge branch 'john/erts/spectre-configure-flag-otp_20/OTP-15430/ERIERL-237' ↵Erlang/OTP
into maint-20 * john/erts/spectre-configure-flag-otp_20/OTP-15430/ERIERL-237: Allow disabling retpoline in interpreter loop Add a ./configure flag for spectre mitigation
2019-01-16Prepare releaseErlang/OTP
2019-01-16Merge branch 'rickard/dirty_scheduler_collapse/OTP-15509' into maint-20Erlang/OTP
* rickard/dirty_scheduler_collapse/OTP-15509: Fix bug causing dirty scheduler sleeper list inconsistency
2019-01-11Fix bug causing dirty scheduler sleeper list inconsistencyRickard Green
2018-12-28Prepare releaseErlang/OTP
2018-12-28Merge branch 'sverker/big-band-bug/ERL-804/OTP-15487' into maint-20Erlang/OTP
* sverker/big-band-bug/ERL-804/OTP-15487: erts: Fix bug in 'band' of two negative numbers, one big
2018-12-17erts: Fix bug in 'band' of two negative numbers, one bigSverker Eriksson
Similar bug as for bxor fixed by abc4fd372d476821448dfb9 Ex: 1> io:format("~.16B\n", [-16#1110000000000000000 band (-1)]). -1120000000000000000 Wrong result for (-X bsl WS) band -Y. where X is any positive integer WS is erlang:system_info(wordsize)*8*N where N is 1 or larger Y is any positive integer smaller than (1 bsl WS) Fix: The subtraction of 1 (for 2-complement conversion) must be carried along all the way to the last words.
2018-11-20Merge branch 'john/erts/spectre-configure-flag/OTP-15430/ERIERL-237' into ↵John Högberg
john/erts/spectre-configure-flag-otp_20/OTP-15430/ERIERL-237 * john/erts/spectre-configure-flag/OTP-15430/ERIERL-237: Allow disabling retpoline in interpreter loop Add a ./configure flag for spectre mitigation
2018-11-20Allow disabling retpoline in interpreter loopJohn Högberg
We only do this when the user has explicitly told us it's okay to partially disable mitigation (spectre-mitigation=incomplete). The macro is inert if it isn't.
2018-11-20Add a ./configure flag for spectre mitigationJohn Högberg
Note that the ERTS_NO_RETPOLINE macro introduced by this commit is completely inert unless spectre-mitigation is set to 'incomplete.' This includes when mitigation has been manually enabled through CFLAGS, so it should be impossible for it to unintentionally disable mitigation.
2018-11-05Prepare releaseErlang/OTP
2018-11-05Merge branch 'john/erts/OTP-20.3.8/minusminus_trapping/OTP-15371' into maint-20Erlang/OTP
* john/erts/OTP-20.3.8/minusminus_trapping/OTP-15371: Optimize operator '--' and yield on large inputs
2018-11-02Optimize operator '--' and yield on large inputsJohn Högberg
The removal set now uses a red-black tree instead of an array on large inputs, decreasing runtime complexity from `n*n` to `n*log(n)`. It will also exit early when there are no more items left in the removal set, drastically improving performance and memory use when the items to be removed are present near the head of the list. This got a lot more complicated than before as the overhead of always using a red-black tree was unacceptable when either of the inputs were small, but this compromise has okay-to-decent performance regardless of input size. Co-authored-by: Dmytro Lytovchenko <[email protected]>
2018-10-31Prepare releaseErlang/OTP
2018-10-31Merge branch 'rickard/internal_ref_cmp/OTP-15399/ERL-751' into maint-20Erlang/OTP
* rickard/internal_ref_cmp/OTP-15399/ERL-751: Fix erts_internal_ref_number_cmp()
2018-10-31Fix erts_internal_ref_number_cmp()Rickard Green
2018-10-16Prepare releaseErlang/OTP
2018-10-16Merge branch 'sverker/erts/ets-select_replace-bug/OTP-15346' into maint-20Erlang/OTP
* sverker/erts/ets-select_replace-bug/OTP-15346: erts: Fix bug in ets:select_replace for bound key
2018-10-09erts: Fix bug in ets:select_replace for bound keySverker Eriksson
which may cause following calls to ets:next or ets:prev to fail.
2018-08-09Update release notesErlang/OTP
2018-08-09Update version numbersErlang/OTP
2018-08-09Merge branch 'dotsimon/ref_ordering_bug/OTP-15225' into maint-20Erlang/OTP
* dotsimon/ref_ordering_bug/OTP-15225: Fixed #Ref ordering bug Test #Ref ordering in lists and ets
2018-08-09Merge branch 'rickard/full-cache-nif-env/OTP-15223/ERL-695' into maint-20Erlang/OTP
* rickard/full-cache-nif-env/OTP-15223/ERL-695: Fix caching of NIF environment when executing dirty
2018-08-09Fix caching of NIF environment when executing dirtyRickard Green
2018-08-09Fixed #Ref ordering bugSimon Cornish
2018-08-09Test #Ref ordering in lists and etsSimon Cornish
2018-07-20Prepare releaseErlang/OTP
2018-07-20Merge branch 'sverker/crash-dump-crash-literals/OTP-15181' into maint-20Erlang/OTP
* sverker/crash-dump-crash-literals/OTP-15181: erts: Fix bug in crash dump generation
2018-07-20Merge branch 'john/erts/inet-drv-race/OTP-15158/ERL-654' into maint-20Erlang/OTP
* john/erts/inet-drv-race/OTP-15158/ERL-654: Fix a race condition when generating async operation ids
2018-07-12erts: Fix bug in crash dump generationSverker Eriksson
Symptom: emulator core dumps during crash dump generation. Problem: erts_dump_lit_areas did not grow correctly to always be equal or larger than number of loaded modules. The comment about twice the size to include both curr and old did not seem right. The beam_ranges structure contains *all* loaded module instances until they are removed when purged.
2018-06-28Prepare releaseErlang/OTP
2018-06-28Merge branch 'john/erts/fix-process-schedule-after-free/OTP-15067/ERL-573' ↵Erlang/OTP
into maint-20 * john/erts/fix-process-schedule-after-free/OTP-15067/ERL-573: Don't enqueue system tasks if target process is in fail_state Fix erroneous schedule of freed/exiting processes Fix deadlock in run queue evacuation Fix memory leak of processes that died in the run queue
2018-06-28Fix a race condition when generating async operation idsJohn Högberg
The counter used for generating async operation ids was a plain int shared between all ports, which was incorrect but mostly worked fine since the ids only had to be unique on a per-port basis. However, some compilers (notably GCC 8.1.1) generated code that assumed that this value didn't change between reads. Using a shortened version of enq_async_w_tmo as an example: int id = async_ref++; op->id = id; //A return id; //B In GCC 7 and earlier, `async_ref` would be read once and assigned to `id` before being incremented, which kept the values at A and B consistent. In GCC 8, `async_ref` was read when assigned at A and read again at B, and then incremented, which made them inconsistent if we raced with another port. This commit fixes the issue by removing `async_ref` altogether and replacing it with a per-port counter which makes it impossible to race with someone else.
2018-06-14Don't enqueue system tasks if target process is in fail_stateJohn Högberg
The fail state wasn't re-checked in the state change loop; only the FREE state was checked. In addition to that, we would leave the task in the queue when bailing out which could lead to a double-free. This commit backports active_sys_enqueue from master to make it easier to merge onwards.
2018-06-14Fix erroneous schedule of freed/exiting processesJohn Högberg
When scheduled out, the process was never checked for the FREE state before rescheduling, which meant that a system task could sneak in and cause a double-free later on.
2018-06-13Prepare releaseErlang/OTP
2018-06-13Merge branch 'sverker/ets-auto-unfix-delete-race/OTP-15109' into maint-20Erlang/OTP
* sverker/ets-auto-unfix-delete-race/OTP-15109: erts: Fix race between ets table deletion and auto-unfix
2018-06-05Prepare releaseErlang/OTP
2018-06-05Merge branch 'sverker/system-profile-bug/OTP-15085' into maint-20Erlang/OTP
* sverker/system-profile-bug/OTP-15085: erts: Fix bug in system_profile
2018-06-05Merge branch 'sverker/enif_binary_to_term-bug/OTP-15080' into maint-20Erlang/OTP
* sverker/enif_binary_to_term-bug/OTP-15080: erts: Fix bug in enif_binary_to_term for immediates
2018-06-04erts: Fix race between ets table deletion and auto-unfixSverker Eriksson
Problem: 1. Process A fixates table T. 2. Process B starts deleting table T (either by ets:delete or exit) and does tid_clear(). 3. Process A exits and does proc_cleanup_fixed_table() and get NULL from btid2tab() and deallocates DbFixation. 4. Process B continues deleting table in free_fixations_locked() and finds the deallocated DbFixation in the fixing_procs tree. Solution: Wait with tid_clear() until after free_fixations_locked() has traversed the fixing_procs tree.
2018-05-21Fix deadlock in run queue evacuationJohn Högberg
2018-05-21Fix memory leak of processes that died in the run queueJohn Högberg
2018-05-18erts: Fix bug in system_profileSverker Eriksson
seen to cause redundant {profile,_,active,_,_} messages when process is terminating.
2018-05-16erts: Fix bug in enif_binary_to_term for immediatesSverker Eriksson
Symptom: Heap corruption Expanded test case to provoke this bug and test some more term types.
2018-05-02Update release notesErlang/OTP
2018-05-02Update version numbersErlang/OTP
2018-05-02Merge branch 'john/erts/fix-heart-command-overflow/OTP-15034/ERIERL-166' ↵Erlang/OTP
into maint-20 * john/erts/fix-heart-command-overflow/OTP-15034/ERIERL-166: heart: Use ntohs instead of manual conversion # Conflicts: # lib/kernel/test/heart_SUITE.erl
2018-04-24heart: Use ntohs instead of manual conversionJohn Högberg
Multiplying a signed char by 256 is undefined behavior and caused problems on some platforms when the length was long enough. We could cast it to an unsigned int to make it work, but it's best not to reinvent the wheel. Fixes OTP-15034