On Sun, Jan 13, 2013 at 10:29:58PM +0000, Andrew Clayton wrote:
> When running qemu-kvm under 64but Fedora 16 under current 3.8, it just
> hangs at start up. Dong a ps -ef hangs the process at the point where it
> would display the qemu process (trying to list the qemu-kvm /proc pid
> directory contents just hangs ls).
>
> I also noticed some other weirdness at this point like Firefox hanging
> for many seconds at a time and increasing load average.
>
> The qemu command I was trying to run was
>
> $ qemu-kvm -m 512 -smp 2 -vga vmware -k en-gb -drive
> file=/home/andrew/machines/qemu/f16-i386.img,if=virtio
>
> Here's the last few lines of a strace on it at start up.
>
> open("/home/andrew/machines/qemu/f16-i386.img", O_RDWR|O_DSYNC|O_CLOEXEC) = 8
> lseek(8, 0, SEEK_END) = 9100722176
> pread(8,
> "QFI\373\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\20\0\0\0\2\200\0\0\0"..., 512,
> 0) = 512
> pread(8,
> "\200\0\0\0\0\4\0\0\200\0\0\0\0\10\0\0\200\0\0\0\2\210\0\0\200\0\0\0\2\233\0\0"...,
> 512, 65536) = 512
> brk(0) = 0x7faf12db0000
> brk(0x7faf12ddd000
>
> It's hanging in that brk syscall. The load average also then starts to
> increase.
>
>
> However. I can make it run fine, if I enable CONFIG_LOCKDEP. But the only
> thing in dmesg I get is the usual.
>
> kvm: SMP vm created on host with unstable TSC; guest TSC will not be reliable
>
> I've attached both working and non-working .configs. The only difference being
> the lock checking enabled in config.good.
>
> The most recent kernel I had it working in was 3.7.0
>
> System is a Quad Core Intel running 64bit Fedora 16.
>
Can you run "echo t > /proc/sysrq-trigger" and see where it hangs?
--
Gleb.
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