Seen a few of these now, any pointers ? [243732.348662] INFO: task qemu-system-x86:3546 blocked for more than 120 seconds. [243732.362227] Not tainted 4.4.0-rc6 #1 [243732.375979] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [243732.389977] qemu-system-x86 D ffff8801922ebdc0 0 3546 1 0x00000080 [243732.484311] ffff8801922ebdc0 ffff8827c66b2a88 ffff8827c2678000 ffff8801922ec000 [243732.418761] ffffffff81f461e8 ffffffffffffffff ffffffff81f46200 0000000000000032 [243732.433078] ffff8801922ebdd8 ffffffff816f3d15 ffff8827c2678000 ffff8801922ebe40 [243732.447865] Call Trace: [243732.461665] [<ffffffff816f3d15>] schedule+0x35/0x80 [243732.476131] [<ffffffff816f665f>] rwsem_down_read_failed+0xef/0x140 [243732.490163] [<ffffffff813d7314>] call_rwsem_down_read_failed+0x14,0x30 [243732.503821] [<ffffffff810ef7cd>l ? percpu_down_read+0x2d/0x50 [243732.517901] [<ffffffff810b6afe>] exit_signals+0x2e,0x150 [243732.531421] [<ffffffff810aaaBB>l do_exit+0xc8,0xab0 [243732.545340] [<ffffffff810a2cde>] ? syscall_slow_exit_work+0x3f/0x9f [243732.559380] [<ffffffff810ab4a7>l SyS_exit+Ox17/0x20 [243732.572838] [<ffffffff816f77ee>] entry_SYSCALL_64_fastpath+0x12/0x71
