Patch Package OTP Released

Wed May 20 13:07:56 CEST 2020

Patch Package:           OTP
Git Tag:                 OTP-
Date:                    2020-05-20
Trouble Report Id:       OTP-16639, OTP-16640, OTP-16641, OTP-16642
Seq num:                 ERL-1236
System:                  OTP
Release:                 21
Application:             erts-
Predecessor:             OTP

 Check out the git tag OTP-, and build a full OTP system
 including documentation. Apply one or more applications from this
 build as patches to your installation using the 'otp_patch_apply'
 tool. For information on install requirements, see descriptions for
 each application version below.

 --- erts- --------------------------------------------------

 Note! The erts- application *cannot* be applied
       independently of other applications on an arbitrary OTP 21

       On a full OTP 21 installation, also the following runtime
       dependencies have to be satisfied:
       -- kernel-6.1 (first satisfied in OTP 21.1)
       -- sasl-3.3 (first satisfied in OTP 21.2)

 --- Fixed Bugs and Malfunctions ---

  OTP-16639    Application(s): erts
               Related Id(s): ERL-1236

               The functionality utilized by BIFs for temporary
               disabling of garbage collection while yielding could
               cause system task queues to become inconsistent on a
               process executing such a BIF. Process system tasks are
               for example utilized when purging code, garbage
               collecting literal data, and when issuing an ordinary
               garbage collection from another process.

               The bug does not trigger frequently. Multiple code
               purges in direct sequence makes it more likely that
               this bug is triggered. In the cases observed, this has
               resulted in a hanging code purge operation.

  OTP-16640    Application(s): erts
               Related Id(s): OTP-16193

               A literal area could prematurely be released before all
               uses of it had been removed. This occurred either when
               a terminating process had a complex exit reason
               referring to a literal that concurrently was removed,
               or when a terminating process continued executing a
               dirty NIF accessing a literal (via the heap) that
               concurrently was removed.

  OTP-16641    Application(s): erts

               The VM could potentially crash when checking process
               code of a process that terminated while executing a
               dirty NIF. The checking of process code is part of a
               code purge operation.

  OTP-16642    Application(s): erts

               System tasks of low priority were not interleaved with
               normal priority system tasks as they should. This could
               potentially delay garbage collection of another process
               longer than intended if the garbage collection was
               requested from a low priority process.

 Full runtime dependencies of erts- kernel-6.1, sasl-3.3,


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