Bug ID: 390754
           Summary: unhandled amd64-darwin syscall: unix:216
           Product: valgrind
           Version: 3.13.0
          Platform: Homebrew (Mac OS X)
                OS: OS X
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
  Target Milestone: ---

Here is the traceback up to the first user source file. The user call was to
copyfile(3). Looking in /usr/include/sys/syscall.h this syscall (unix:216) is

--36893-- WARNING: unhandled amd64-darwin syscall: unix:216
--36893-- You may be able to write your own handler.
--36893-- Read the file README_MISSING_SYSCALL_OR_IOCTL.
--36893-- Nevertheless we consider this a bug.  Please report
--36893-- it at
--36893-- UNKNOWN mach_msg unhandled MACH_SEND_TRAILER option (repeated 16
==36893== Syscall param mach_msg("rcv_name") contains uninitialised byte(s)
==36893==    at 0x10169B34A: mach_msg_trap (in
==36893==    by 0x10169A796: mach_msg (in
==36893==    by 0x1018373F2: _os_trace_prefs_and_mode_refresh_slow (in
==36893==    by 0x10183A4D3: os_log_shim_enabled (in
==36893==    by 0x10153CEAC: syslog (in /usr/lib/system/libsystem_asl.dylib)
==36893==    by 0x1013DB774: copyfile (in /usr/lib/system/libcopyfile.dylib)
==36893==    by 0x110CDB9E6: uv__fs_work (fs.c:797)

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