It was bisected to
https://github.com/rakudo/rakudo/commit/f590863e1736c75207c9ce0335ea646e3529060e

Example (before and after):
https://gist.github.com/Whateverable/2a9088ddcff37fd6f748b77ba3339af2

On 2017-08-10 14:54:24, jdv79 wrote:
> I updated to:
>
>
> [jdv@localhost ~]$ perl6 -v
> This is Rakudo version 2017.07-144-gec7bc25 built on MoarVM version
> 2017.07-365-gc0f7a3b
> implementing Perl 6.c.
> [jdv@localhost ~]$
>
>
> from a build from last weekend or so and the json tiny tests failed
> and
> spit out some bad bytes:
>
>
> # Failed test 'JSON string «["̥̞ͫͩ̉̎͊ỏ̟͙̞̻̻̹̹r̵̨͇̫̦̺̮̼ͭ,̷̧̬̲͈̤̤̅̉͛ͫ͠
> ̣͕̝̳̗̲̩̣͗̋͘e̼ͩ̔̿̾̋̾͘a̸̙͙͔̜͙̳̻͊ͯͪͤͬ͊͆͠c̦̃̓̈̾͗́͝͝ḩ͉͓̦̯̞̆
>
̵͇͍ͪ̀́w̷ͩ͗̃͒͏̲̼̯̕i̞̫̜̮̣̰͎̅̂͋̀ͅń̢̨̪̭̠̼͕͎̐́͆̅ͅd̰̤̝͎̹͕ͩ̃̏̃̍͊̔ȏ̶̼̺̪̾ͨ̈̄ͤ̄̚̕w̙̻̱̙̺͎͚̙ͧͪ̊̒̕͝
> ̴̼̰̱͈̠ͤ̋̏̇͛&̠̺̟̞͎̳̻̙̽̓́̔̇ͩ͛ͧ̚ ̡̡̫̻͐̌̐̌ͬͦ̂͞"]» parsed'
> # at t/01-parse.t line 208
> # Looks like you failed 1 test of 93
> Input (2 characters) is not a valid JSON string
> in sub from-json at
>
/Users/ugexe/.zef/store/json.git/957740bb22b122b711363328e224b56935873a61/lib/JSON/Tiny.pm
> (JSON::Tiny) line 59
> in block <unit> at t/03-unicode.t line 15
>
> and then this happens:
>
> Aug 10 14:29:48 localhost.localdomain gnome-terminal-server[3375]: **
> Aug 10 14:29:48 localhost.localdomain gnome-terminal-server[3375]:
> Pango:ERROR:pango-glyph-
> item.c:319:pango_glyph_item_iter_next_cluster:
> assertion failed: (iter->start_char < iter->end_char)
> Aug 10 14:29:48 localhost.localdomain audit[3375]: ANOM_ABEND
> auid=1000
> uid=1000 gid=1000 ses=5 pid=3375 comm="gnome-terminal-"
> exe="/usr/libexec/gnome-terminal-server" sig=6 res=1
> Aug 10 14:29:48 localhost.localdomain abrt-hook-ccpp[3910]: Process
> 3375 (gnome-terminal-server) of user 1000 killed by SIGABRT - dumping
> core
> Aug 10 14:29:48 localhost.localdomain systemd[2268]:
> gnome-terminal-server.service: Main process exited, code=dumped,
> status=6/ABRT
> Aug 10 14:29:48 localhost.localdomain systemd[2268]:
> gnome-terminal-server.service: Unit entered failed state.
> Aug 10 14:29:48 localhost.localdomain systemd[2268]:
> gnome-terminal-server.service: Failed with result 'core-dump'.
>
> which is the log version of "all my gnome-terminal instances just
> vanished...:(".

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