The problem is related to this change.

I think you also need this patch.

Fixed patch: (The linked ones had line breaks inserted.)

diff --git a/Coro-6.49/Coro/State.xs b/Coro-6.49/Coro/State.xs
index 6d631bd..c2cbe7b 100644
--- a/Coro-6.49/Coro/State.xs
+++ b/Coro-6.49/Coro/State.xs
@@ -1395,7 +1395,18 @@ runops_trace (pTHX)
                           PUSHMARK (SP);
                           PUSHs (&PL_sv_yes);
                           PUSHs (fullname);
-                          PUSHs (CxHASARGS (cx) ? sv_2mortal (newRV_i
+nc ((SV *)cx->blk_sub.argarray)) : &PL_sv_undef);
+                          {
+                            AV *aa;
+# if PERL_VERSION_ATLEAST(5,23,8)
+                            aa = ((AV*)(AvARRAY(MUTABLE_AV(
+                                    PadlistARRAY(CvPADLIST(cx->blk_su
+b.cv))[
+                                    CvDEPTH(cx->blk_sub.cv)]))[0]));
+#else
+                            aa = cx->blk_sub.argarray;
+#endif
+
+                            PUSHs (CxHASARGS (cx) ? sv_2mortal (newRV
+_inc ((SV *)aa)) : &PL_sv_undef);
+                          }
                           PUTBACK;
                           cb = hv_fetch ((HV *)SvRV (coro_current), "
+_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
                           if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | 
+G_VOID | G_DISCARD);
[download]

I tested with:

cd /tmp
curl -sSL 'http://search.cpan.org/CPAN/authors/id/M/ML/MLEHMANN/Coro-6
+.49.tar.gz' | tar xz
cd Coro-6.49
curl -sSL 'http://markmail.org/download.xqy?id=a5n4rqivzbn5zsqp&number
+=1' | patch -p1
curl -sSL 'http://www.perlmonks.org/?abspart=1;displaytype=displaycode
+;node_id=1165171;part=1' | patch -p2
perl Makefile.PL
make test
[download]

I now get:

...
t/07_eval.t ........... 1/5 *** glibc detected *** /home/ikegami/usr/p
+erlbrew/perls/5.24.0t/bin/perl: realloc(): invalid next size: 0x00000
+00000a476d0 ***
...
[download]