100% CPU Usage, unable to boot VMs on kernel 3.19

[rfkrocktk-oracle]

I'm on Ubuntu 14.04 on kernel 3.19 as part of the Vivid HWE stack. I'm on the latest 5.0 release from your repository.

Regardless of the operating system, I've found a really nasty bug that keeps recurring. After installing an operating system, as soon as I reboot, the CPU locks to 100% and the machine never boots. I've demonstrated this with Windows 7 guests and Linux guests. I basically cannot use VirtualBox for this reason and it's incredibly annoying.

Happy to provide debugging information.

[Frank Mehnert]

Please provide a VBox.log file for such a VM session when the CPU locks 100%.

[rfkrocktk-oracle]

strace gives me the following:

mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7d6016f000
write(1, "Waiting for VM \"Gentoo\" to power"..., 39Waiting for VM "Gentoo" to power on...
) = 39
write(7, "8", 1)                        = 1
futex(0x1ef3e80, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x1ef4dfc, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 19, {1450145664, 820932000}, ffffffff) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x1ef4e48, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x1ef569c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1ef5698, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1
sched_yield()                           = 0
futex(0x1ef509c, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 13, {1451698946, 47121000}, ffffffff) = 0
futex(0x1ef50e8, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x1ef509c, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 15, {1451698946, 47373000}, ffffffff) = 0
futex(0x1ef50e8, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x1ef569c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1ef5698, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1
sched_yield()                           = 0
futex(0x1ef509c, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 17, {1451698946, 47514000}, ffffffff) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x1ef509c, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 18, {1451698946, 47514000}, ffffffff) = 0
futex(0x1ef50e8, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x1ef5098, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x1ef509c, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 22, {1451698946, 47815000}, ffffffff) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x1ef50e8, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x1ef509c, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 25, {1451698946, 47985000}, ffffffff^CProcess 731 detached

It blocks forever on that call and never returns. CPU utilization is at 100%.

[Frank Mehnert]

Sorry, I was asking for the VBox.log file, not for an strace dump. The VBox.log file can be found in ~/VirtualBox VMs/VM_NAME/Logs/VBox.log