[Gc] libgc-7.6 in GNU/Hurd

Hello,
I'm testing libgc-7.6 in GNU/Hurd systems, in the check phase "gctest"  
there is a deadlock:

      gnu/store/1h7p18gpn84kdww5i542k93arw4hhgs8-libgc-7.6.0/lib
      make[2]: Leaving directory  
'/tmp/guix-build-libgc-7.6.0.drv-0/gc-7.6.0'
      make  check-TESTS
      make[2]: Entering directory  
'/tmp/guix-build-libgc-7.6.0.drv-0/gc-7.6.0'
      make[3]: Entering directory  
'/tmp/guix-build-libgc-7.6.0.drv-0/gc-7.6.0'
      PASS: cordtest
      building of  
`/gnu/store/y3icscjhkk7pa7dg21xqy46riysi36rn-libgc-7.6.0.drv' timed
      out after 3600 seconds of silence
      @ build-failed  
/gnu/store/y3icscjhkk7pa7dg21xqy46riysi36rn-libgc-7.6.0.drv - tim
      eout

A small  analysis of the bug on the bug-hurd mailing lists is:
https://lists.gnu.org/archive/html/bug-hurd/2017-01/msg00008.html

Any ideas that can help us understand the problem?
Thanks