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diff --git a/Coro-6.49/Coro/State.xs b/Coro-6.49/Coro/State.xs
index 6d631bd..c2cbe7b 100644
...
                           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);

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

...
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 ***
...