linux-kernel - Re: qemu-kvm hangs at start up under 3.8.0-rc3-00074-gb719f43 (works with CONFIG

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Date:	Mon, 14 Jan 2013 18:24:49 +0000
From:	Andrew Clayton <andrew@...ital-domain.net>
To:	Gleb Natapov <gleb@...hat.com>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: qemu-kvm hangs at start up under 3.8.0-rc3-00074-gb719f43
 (works with CONFIG_LOCKDEP)

On Mon, 14 Jan 2013 15:27:36 +0200, Gleb Natapov wrote:

> 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?

Here you go, here's the bash process, qemu and a kvm bit. (From the
above command)

bash            S ffff88013b2b0d00     0  3203   3133 0x00000000
 ffff880114dabe58 0000000000000082 8000000113558065 ffff880114dabfd8
 ffff880114dabfd8 0000000000004000 ffff88013b0c5b00 ffff88013b2b0d00
 ffff880114dabd88 ffffffff8109067d ffffea0004536670 ffffea0004536640
Call Trace:
 [<ffffffff8109067d>] ? default_wake_function+0xd/0x10
 [<ffffffff8108a315>] ? atomic_notifier_call_chain+0x15/0x20
 [<ffffffff8133d84f>] ? tty_get_pgrp+0x3f/0x50
 [<ffffffff810819ac>] ? pid_vnr+0x2c/0x30
 [<ffffffff8133fe54>] ? tty_ioctl+0x7b4/0xbd0
 [<ffffffff8106bf62>] ? wait_consider_task+0x102/0xaf0
 [<ffffffff815c00e4>] schedule+0x24/0x70
 [<ffffffff8106cb24>] do_wait+0x1d4/0x200
 [<ffffffff8106d9cb>] sys_wait4+0x9b/0xf0
 [<ffffffff8106b9f0>] ? task_stopped_code+0x50/0x50
 [<ffffffff815c1ad2>] system_call_fastpath+0x16/0x1b

qemu-kvm        D ffff88011ab8c8b8     0  3345   3203 0x00000000
 ffff880112129cd8 0000000000000082 ffff880112129c50 ffff880112129fd8
 ffff880112129fd8 0000000000004000 ffff88013b04ce00 ffff880139da1a00
 0000000000000000 00000000000280da ffff880112129d38 ffffffff810d3300
Call Trace:
 [<ffffffff810d3300>] ? __alloc_pages_nodemask+0xf0/0x7c0
 [<ffffffff811273c6>] ? touch_atime+0x66/0x170
 [<ffffffff810cdabf>] ? generic_file_aio_read+0x5bf/0x730
 [<ffffffff815c00e4>] schedule+0x24/0x70
 [<ffffffff815c0cdd>] rwsem_down_failed_common+0xbd/0x150
 [<ffffffff815c0da3>] rwsem_down_write_failed+0x13/0x15
 [<ffffffff812d1be3>] call_rwsem_down_write_failed+0x13/0x20
 [<ffffffff815bf4dd>] ? down_write+0x2d/0x34
 [<ffffffff810f0724>] vma_adjust+0xe4/0x610
 [<ffffffff810f0fa4>] vma_merge+0x1b4/0x270
 [<ffffffff810f1fa6>] do_brk+0x196/0x330
 [<ffffffff810f2217>] sys_brk+0xd7/0x130
 [<ffffffff815c1ad2>] system_call_fastpath+0x16/0x1b
kvm-pit/3345    S 0000000000000000     0  3346      2 0x00000000
 ffff880112149e68 0000000000000046 ffff88013fd91340 ffff880112149fd8
 ffff880112149fd8 0000000000004000 ffff88013b04ce00 ffff88013b2b6e80
 ffff880112149ea8 ffffffff815bfb6c ffff880112149db8 ffff880112149fd8
Call Trace:
 [<ffffffff815bfb6c>] ? __schedule+0x2dc/0x830
 [<ffffffff810904be>] ? try_to_wake_up+0xbe/0x270
 [<ffffffff8109067d>] ? default_wake_function+0xd/0x10
 [<ffffffff815c00e4>] schedule+0x24/0x70
 [<ffffffff81084975>] kthread_worker_fn+0xb5/0x110
 [<ffffffff810848c0>] ? __init_kthread_worker+0x20/0x20
 [<ffffffff810842fb>] kthread+0xbb/0xc0
 [<ffffffff81084240>] ? __kthread_parkme+0x80/0x80
 [<ffffffff815c1a2c>] ret_from_fork+0x7c/0xb0
 [<ffffffff81084240>] ? __kthread_parkme+0x80/0x80

Cheers,
Andrew
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