The nightly test:

runtime/threads/LoopTest

is being timed out due to the test hanging.

The test result can be found at:
http://sqeweb.sfbay.sun.com/nfs/tools/gtee/results/JDK7/NIGHTLY/VM/2010-09-04/G1_GC_Baseline/vm/linux-amd64/server/mixed/linux-amd64_vm_server_mixed_vm.runtime.testlist/analysis.html

Machine:
vm-amd64-07 (note you have to use the gtee account to login) but I've also seen it on my workstation. The hang happens quite frequently on the test system.

Test directory:
/net/sqenfs-2.sfbay/export2/results/vm/gtee/JDK7/NIGHTLY/VM/2010-09-04/G1_GC_Baseline/vm/linux-amd64/server/mixed/linux-amd64_vm_server_mixed_vm.runtime.testlist

This test is also being run with +ExplicitInvokesConcurrent.

In the test there is a Java thread that performs System.gc calls in a loop; a thread that just increments a counter in a loop; and a thread that sleeps for a specified period of time, wakes up and sets the loop termination variable for the other 2 threads.