libMicro hangs during mprotect test on Red Hat Enterprise Linux 6 Beta 2

Issue

The mprotect test from the LibMicro set of benchmarks hangs on kernel-2.6.32-31 and kernel-2.6.32-37

The sysrq-t output is

Jul 28 17:28:25 etc758290a kernel: mprotect      R  running task        0  4506   4505 0x00000080
Jul 28 17:28:25 etc758290a kernel: ffff8809010efec8 ffffffff814d7f86 0000000000000000 ffff880900000160
Jul 28 17:28:25 etc758290a kernel: ffff880900000000 ffff8809010efe50 ffffffff81055690 ffff8809051fa138
Jul 28 17:28:25 etc758290a kernel: ffff88094fc368b0 0000000000000000 ffffea001f7e5d60 ffff88090308c700
Jul 28 17:28:25 etc758290a kernel: Call Trace:
Jul 28 17:28:25 etc758290a kernel: [<ffffffff814d7f86>] ? thread_return+0x4e/0x778
Jul 28 17:28:25 etc758290a kernel: [<ffffffff81055690>] ? __dequeue_entity+0x30/0x50
Jul 28 17:28:25 etc758290a kernel: [<ffffffff81013c8e>] ? apic_timer_interrupt+0xe/0x20
Jul 28 17:28:25 etc758290a kernel: [<ffffffff81013c8e>] ? apic_timer_interrupt+0xe/0x20
Jul 28 17:28:25 etc758290a kernel: [<ffffffff81133f4d>] ? handle_mm_fault+0x1ed/0x2b0
Jul 28 17:28:25 etc758290a kernel: [<ffffffff814dd284>] ? do_page_fault+0x154/0x3a0
Jul 28 17:28:25 etc758290a kernel: [<ffffffff814dac45>] ? page_fault+0x25/0x30