Comment # 7 on bug 946947 from Dominique Leuenberger

Just to add some noise here: I've been triggering mbedtls in a staging whenever
I saw it 'hanging' (the whole build should not take more than 2 minutes).

Those are the hosts it failed on so far:
>2015-10-09 12:32:47 CET  mbedtls new build        failed               3h  7m 26s   build96:3       
>2015-10-09 12:43:54 CET  mbedtls new build        failed                  10m 33s   build87:10      
>2015-10-09 12:54:03 CET  mbedtls new build        failed                   5m  3s   build97:7       
>2015-10-09 13:01:02 CET  mbedtls new build        failed                   6m 43s   build96:7       
>2015-10-09 13:03:24 CET  mbedtls new build        failed                   2m  1s   build95:4       
>2015-10-09 13:05:40 CET  mbedtls new build        failed                   1m 39s   build96:4       
>2015-10-09 13:10:43 CET  mbedtls new build        failed                   4m 41s   build88:11      
>2015-10-09 13:18:01 CET  mbedtls new build        failed                   7m  8s   build87:2  

so, seen on build87, build88, build95 and build96