Running spectest with HARNESS_TYPE=6 and an attached gdb process

gistfile1.txt

dogbert@dogbert-VirtualBox ~/repos/rakudo $ ./perl6-m -Ilib t/harness6 --fudge --tests-from-file=t/spectest.data
t/spec/S01-perl-5-integration/array.rakudo.moar ................... ok  
t/spec/S01-perl-5-integration/basic.rakudo.moar ................... ok  
...[plenty of tests omitted from listing]
t/spec/S32-num/unpolar.t .......................................... ok     
t/spec/S32-scalar/defined.t ....................................... ok  
t/spec/S32-scalar/perl.rakudo.moar ................................ ok 
t/spec/S32-scalar/undef.rakudo.moar ............................... ok  
t/spec/S32-str/append.t ........................................... ok 
t/spec/S32-str/bool.t ............................................. ok  
moar: 3rdparty/libuv/src/unix/stream.c:1499: uv_read_start: Assertion `((stream)->io_watcher.fd) >= 0' failed.
Aborted

gdb output, tried to debug the entire thing

Program received signal SIGABRT, Aborted.
[Switching to Thread 0xb5c5eb40 (LWP 32633)]
0xb776acb0 in ?? ()
(gdb) bt
#0  0xb776acb0 in ?? ()
#1  0xb73c9caa in read_to_buffer (tc=0xb72bf78, data=0xb4b785a0, bytes=65536) at src/io/syncstream.c:71
#2  0xb73c9e20 in MVM_io_syncstream_read_line (tc=0xb72bf78, h=0xb518d484, chomp=0) at src/io/syncstream.c:107
#3  0xb73c694a in MVM_io_readline (tc=0xb72bf78, oshandle=0xb518d484, chomp=0) at src/io/io.c:146
#4  0xb7380768 in MVM_interp_run (tc=0xb72bf78, initial_invoke=0xb73a359b <thread_initial_invoke>, invoke_data=0xb72a360) at src/core/interp.c:3634
#5  0xb73a36dd in start_thread (data=0xb72a360) at src/core/threads.c:77
#6  0xb749d896 in uv__thread_start (arg=0xb72a370) at 3rdparty/libuv/src/unix/thread.c:49
#7  0xb70a9f72 in start_thread (arg=0xb5c5eb40) at pthread_create.c:312
#8  0xb71f1f8e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:129
(gdb) frame 1
#1  0xb73c9caa in read_to_buffer (tc=0xb72bf78, data=0xb4b785a0, bytes=65536) at src/io/syncstream.c:71
71	        if ((r = uv_read_start(data->handle, on_alloc, on_read)) < 0)
(gdb) p MVM_dump_backtrace(tc)
   at <unknown>:1  (./CORE.setting.moarvm:get)
 from SETTING::src/core/IO/Pipe.pm:12  (./CORE.setting.moarvm:)
 from SETTING::src/core/Seq.pm:265  (./CORE.setting.moarvm:)
 from SETTING::src/core/Seq.pm:286  (./CORE.setting.moarvm:pull-one)
 from SETTING::src/core/Any-iterable-methods.pm:458  (./CORE.setting.moarvm:)
 from SETTING::src/core/Any-iterable-methods.pm:454  (./CORE.setting.moarvm:sink-all)
 from SETTING::src/core/Seq.pm:184  (./CORE.setting.moarvm:sink)
 from /home/dogbert/repos/rakudo/lib/TAP.pm6 (TAP):885  (/home/dogbert/repos/rakudo/lib/.precomp/CF0A967EEA40B43E91E75F753ADB5E22B8474B83.1486144735.68594/FB/FB7BC71B84DC9F961E5538C6DC0BFA7D98E5F671:)
 from /home/dogbert/repos/rakudo/lib/TAP.pm6 (TAP):858  (/home/dogbert/repos/rakudo/lib/.precomp/CF0A967EEA40B43E91E75F753ADB5E22B8474B83.1486144735.68594/FB/FB7BC71B84DC9F961E5538C6DC0BFA7D98E5F671:)
 from /home/dogbert/repos/rakudo/lib/TAP.pm6 (TAP):857  (/home/dogbert/repos/rakudo/lib/.precomp/CF0A967EEA40B43E91E75F753ADB5E22B8474B83.1486144735.68594/FB/FB7BC71B84DC9F961E5538C6DC0BFA7D98E5F671:run)
 from /home/dogbert/repos/rakudo/lib/TAP.pm6 (TAP):1039  (/home/dogbert/repos/rakudo/lib/.precomp/CF0A967EEA40B43E91E75F753ADB5E22B8474B83.1486144735.68594/FB/FB7BC71B84DC9F961E5538C6DC0BFA7D98E5F671:)
 from SETTING::src/core/Any-iterable-methods.pm:466  (./CORE.setting.moarvm:)
 from SETTING::src/core/Any-iterable-methods.pm:454  (./CORE.setting.moarvm:sink-all)
 from SETTING::src/core/Seq.pm:184  (./CORE.setting.moarvm:sink)
 from /home/dogbert/repos/rakudo/lib/TAP.pm6 (TAP):1036  (/home/dogbert/repos/rakudo/lib/.precomp/CF0A967EEA40B43E91E75F753ADB5E22B8474B83.1486144735.68594/FB/FB7BC71B84DC9F961E5538C6DC0BFA7D98E5F671:)
 from /home/dogbert/repos/rakudo/lib/TAP.pm6 (TAP):1035  (/home/dogbert/repos/rakudo/lib/.precomp/CF0A967EEA40B43E91E75F753ADB5E22B8474B83.1486144735.68594/FB/FB7BC71B84DC9F961E5538C6DC0BFA7D98E5F671:)
 from SETTING::src/core/Promise.pm:218  (./CORE.setting.moarvm:)
 from SETTING::src/core/ThreadPoolScheduler.pm:284  (./CORE.setting.moarvm:)
 from SETTING::src/core/ThreadPoolScheduler.pm:173  (./CORE.setting.moarvm:)
 from SETTING::src/core/ThreadPoolScheduler.pm:166  (./CORE.setting.moarvm:)
 from SETTING::src/core/ThreadPoolScheduler.pm:163  (./CORE.setting.moarvm:)
 from SETTING::src/core/Thread.pm:30  (./CORE.setting.moarvm:THREAD-ENTRY)
 
 update, attaching strace at a convenient time shows the following
 
[pid 26813] socketpair(PF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC, 0, [1021, 1022]) = 0
[pid 26813] pipe2(0xb5036b18, O_CLOEXEC) = -1 EMFILE (Too many open files)
[pid 26813] close(1021)                 = 0
[pid 26813] close(1022)                 = 0
[pid 26813] write(2, "moar: 3rdparty/libuv/src/unix/st"..., 111) = 111
[pid 26813] mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7250000
[pid 26813] rt_sigprocmask(SIG_UNBLOCK, [ABRT], NULL, 8) = 0
[pid 26813] tgkill(24455, 26813, SIGABRT) = 0
[pid 26813] --- SIGABRT {si_signo=SIGABRT, si_code=SI_TKILL, si_pid=24455, si_uid=1000} ---
[pid 26813] +++ killed by SIGABRT +++