Running the mono-3-2 branch as of a0fc6ba35b7454425b8ec772b2652730b8030a52 I'm seeing test timeouts in mono/tests/gsharing-valuetype-layout.exe in about 3% of runs.
On investigation, when the tests timeout the mono runtime is hanging.
I can provide more stack traces if it would help.
Running on OpenSuse 12.3,
# uname -a
Linux linux-mono.nirvanix.com 3.7.10-1.1-desktop #1 SMP PREEMPT Thu Feb 28 15:06:29 UTC 2013 (82d3f21) x86_64 x86_64 x86_64 GNU/Linux
Running on a VMware virtual machine with 4 CPUs and 8 GB of RAM.
Note that this can be worked around by using "-O=-aot".
This is also repeatable with the code from git master at change 1269b409b37730a07a050a84fda9086b46437b5f.
Can still be worked around with "-O=-aot".
This is a dup of #8517.
Fixed in master in 9a6510ece63cee1a0416c123f8de84767b3ae2e2.