6:31 a.m.
On Wed, Jul 30, 2014 at 03:58:43PM -0700, Zetan Drableg wrote:
[00183ms] /usr/libexec/qemu-kvm \
-global virtio-blk-pci.scsi=off \
-nodefconfig \
-nodefaults \
-nographic \
-machine accel=kvm:tcg \
-cpu host,+kvmclock \
-m 500 \
-no-reboot \
-kernel /var/tmp/.guestfs-0/kernel.47903 \
-initrd /var/tmp/.guestfs-0/initrd.47903 \
-device virtio-scsi-pci,id=scsi \
-drive file=/tmp/libguestfs-test-tool-sda-Iakpwe,cache=none,format
=raw,id=hd0,if=none \
-device scsi-hd,drive=hd0 \
-drive file=/var/tmp/.guestfs-0/root.47903,snapshot=on,id=appliance,
if=none,cache=unsafe \
-device scsi-hd,drive=appliance \
-device virtio-serial \
-serial stdio \
-device sga \
-chardev socket,path=/tmp/libguestfspx9994/guestfsd.sock,id=channel0
\
-device virtserialport,chardev=channel0,name=org.libguestfs.channel.0
\
-append 'panic=1 console=ttyS0 udevtimeout=600 no_timer_check
acpi=off printk.time=1 cgroup_disable=memory root=/dev/sdb selinux=0
guestfs_verbose=1 TERM=xterm edd=off'
\x1b[1;256r\x1b[256;256H\x1b[6n
Google, Inc.
Serial Graphics Adapter 10/14/11
SGABIOS $Id: sgabios.S 8 2010-04-22 00:03:40Z nlaredo $ (mockbuild@
ca-build44.us.oracle.com) Fri Oct 14 20:04:36 UTC 2011
Term: 80x24
4 0
SeaBIOS (version seabios-0.6.1.2-28.el6)
\x1b[2J
At this point it hangs forever.
These hangs can be tricky to diagnose.
There are a couple of things you can do however:
(1) strace qemu to find out what it is doing, or:
(2) [harder, but much more informative] gdb into the guest to find out
where the guest hangs, or:
(3) Take the command line above, and cut it down to try to isolate the
problematic options. I would concentrate on the following options as
being most likely to cause trouble:
-cpu
-machine
-kernel
-device sga (remove it)
For (1) and (2) you can use a qemu wrapper to modify the qemu command
that the test tool runs.
See also:
http://libguestfs.org/guestfs.3.html#qemu-wrappers
http://rwmj.wordpress.com/2011/10/12/tip-debugging-the-early-boot-process...
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-builder quickly builds VMs from scratch
http://libguestfs.org/virt-builder.1.html
2:12 p.m.
New subject: hang after seabios
Hi Richard thanks for the info.
I took the strace approach and ran into this looping over and over again.
Is it failing to get time?
timer_gettime(0x8, {it_interval={0, 0}, it_value={0, 0}}) = 0
timer_settime(0x8, 0, {it_interval={0, 0}, it_value={0, 250000}}, NULL) = 0
timer_gettime(0x8, {it_interval={0, 0}, it_value={0, 204443}}) = 0
select(16, [0 6 9 13 15], [], [], {1, 0}) = 2 (in [6 13], left {0, 999998})
read(13, "\1\0\0\0\0\0\0\0", 4096) = 8
read(13, 0x7fffa2ed3f70, 4096) = -1 EAGAIN (Resource
temporarily unavailable)
read(6, "\0", 512) = 1
read(6, 0x7fffa2ed4d70, 512) = -1 EAGAIN (Resource
temporarily unavailable)
select(16, [0 6 9 13 15], [], [], {1, 0}) = 1 (in [15], left {0, 999998})
read(15,
"\16\0\0\0\0\0\0\0\376\377\377\377\0\0\0\0\0\0\0\0\0\0\0\0\10\0\0\0\0\0\0\0"...,
128) = 128
rt_sigaction(SIGALRM, NULL, {0x7f6d8b8d17d0, ~[KILL STOP RTMIN RT_1],
SA_RESTORER, 0x7f6d8b211710}, 8) = 0
write(7, "\0", 1) = 1
write(14, "\1\0\0\0\0\0\0\0", 8) = 8
read(15, 0x7fffa2ed4ee0, 128) = -1 EAGAIN (Resource
temporarily unavailable)
timer_gettime(0x8, {it_interval={0, 0}, it_value={0, 0}}) = 0
timer_settime(0x8, 0, {it_interval={0, 0}, it_value={0, 988758000}}, NULL) = 0
select(16, [0 6 9 13 15], [], [], {1, 0}) = 2 (in [6 13], left {0, 999998})
read(13, "\1\0\0\0\0\0\0\0", 4096) = 8
read(13, 0x7fffa2ed3f70, 4096) = -1 EAGAIN (Resource
temporarily unavailable)
read(6, "\0", 512) = 1
read(6, 0x7fffa2ed4d70, 512) = -1 EAGAIN (Resource
temporarily unavailable)
It looks a lot like the bug you filed here.
https://bugzilla.redhat.com/show_bug.cgi?id=553689
There are quite a few hits on this trace but nothing real specific.
-Zetan
On Thu, Jul 31, 2014 at 4:31 AM, Richard W.M. Jones <rjones(a)redhat.com> wrote:
On Wed, Jul 30, 2014 at 03:58:43PM -0700, Zetan Drableg wrote:
> [00183ms] /usr/libexec/qemu-kvm \
> -global virtio-blk-pci.scsi=off \
> -nodefconfig \
> -nodefaults \
> -nographic \
> -machine accel=kvm:tcg \
> -cpu host,+kvmclock \
> -m 500 \
> -no-reboot \
> -kernel /var/tmp/.guestfs-0/kernel.47903 \
> -initrd /var/tmp/.guestfs-0/initrd.47903 \
> -device virtio-scsi-pci,id=scsi \
> -drive file=/tmp/libguestfs-test-tool-sda-Iakpwe,cache=none,format
> =raw,id=hd0,if=none \
> -device scsi-hd,drive=hd0 \
> -drive file=/var/tmp/.guestfs-0/root.47903,snapshot=on,id=appliance,
> if=none,cache=unsafe \
> -device scsi-hd,drive=appliance \
> -device virtio-serial \
> -serial stdio \
> -device sga \
> -chardev socket,path=/tmp/libguestfspx9994/guestfsd.sock,id=channel0
> \
> -device virtserialport,chardev=channel0,name=org.libguestfs.channel.0
> \
> -append 'panic=1 console=ttyS0 udevtimeout=600 no_timer_check
> acpi=off printk.time=1 cgroup_disable=memory root=/dev/sdb selinux=0
> guestfs_verbose=1 TERM=xterm edd=off'
> \x1b[1;256r\x1b[256;256H\x1b[6n
> Google, Inc.
> Serial Graphics Adapter 10/14/11
> SGABIOS $Id: sgabios.S 8 2010-04-22 00:03:40Z nlaredo $ (mockbuild@
> ca-build44.us.oracle.com) Fri Oct 14 20:04:36 UTC 2011
> Term: 80x24
> 4 0
> SeaBIOS (version seabios-0.6.1.2-28.el6)
> \x1b[2J
>
> At this point it hangs forever.
These hangs can be tricky to diagnose.
There are a couple of things you can do however:
(1) strace qemu to find out what it is doing, or:
(2) [harder, but much more informative] gdb into the guest to find out
where the guest hangs, or:
(3) Take the command line above, and cut it down to try to isolate the
problematic options. I would concentrate on the following options as
being most likely to cause trouble:
-cpu
-machine
-kernel
-device sga (remove it)
For (1) and (2) you can use a qemu wrapper to modify the qemu command
that the test tool runs.
See also:
http://libguestfs.org/guestfs.3.html#qemu-wrappers
http://rwmj.wordpress.com/2011/10/12/tip-debugging-the-early-boot-process...
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-builder quickly builds VMs from scratch
http://libguestfs.org/virt-builder.1.html
2:17 p.m.
New subject: hang after seabios
On Thu, Jul 31, 2014 at 12:12:26PM -0700, Zetan Drableg wrote:
Hi Richard thanks for the info.
I took the strace approach and ran into this looping over and over again.
Is it failing to get time?
timer_gettime(0x8, {it_interval={0, 0}, it_value={0, 0}}) = 0
timer_settime(0x8, 0, {it_interval={0, 0}, it_value={0, 250000}}, NULL) = 0
timer_gettime(0x8, {it_interval={0, 0}, it_value={0, 204443}}) = 0
select(16, [0 6 9 13 15], [], [], {1, 0}) = 2 (in [6 13], left {0, 999998})
read(13, "\1\0\0\0\0\0\0\0", 4096) = 8
read(13, 0x7fffa2ed3f70, 4096) = -1 EAGAIN (Resource
temporarily unavailable)
read(6, "\0", 512) = 1
read(6, 0x7fffa2ed4d70, 512) = -1 EAGAIN (Resource
temporarily unavailable)
select(16, [0 6 9 13 15], [], [], {1, 0}) = 1 (in [15], left {0, 999998})
read(15,
"\16\0\0\0\0\0\0\0\376\377\377\377\0\0\0\0\0\0\0\0\0\0\0\0\10\0\0\0\0\0\0\0"...,
128) = 128
rt_sigaction(SIGALRM, NULL, {0x7f6d8b8d17d0, ~[KILL STOP RTMIN RT_1],
SA_RESTORER, 0x7f6d8b211710}, 8) = 0
write(7, "\0", 1) = 1
write(14, "\1\0\0\0\0\0\0\0", 8) = 8
read(15, 0x7fffa2ed4ee0, 128) = -1 EAGAIN (Resource
temporarily unavailable)
timer_gettime(0x8, {it_interval={0, 0}, it_value={0, 0}}) = 0
timer_settime(0x8, 0, {it_interval={0, 0}, it_value={0, 988758000}}, NULL) = 0
select(16, [0 6 9 13 15], [], [], {1, 0}) = 2 (in [6 13], left {0, 999998})
read(13, "\1\0\0\0\0\0\0\0", 4096) = 8
read(13, 0x7fffa2ed3f70, 4096) = -1 EAGAIN (Resource
temporarily unavailable)
read(6, "\0", 512) = 1
read(6, 0x7fffa2ed4d70, 512) = -1 EAGAIN (Resource
temporarily unavailable)
It looks a lot like the bug you filed here.
https://bugzilla.redhat.com/show_bug.cgi?id=553689
I'm fairly sure this is just qemu running as normal. It's not a
duplicate of that ancient bug, because you can see from the messages
that SeaBIOS is running.
You need to `gdb' into the guest to see where the emulation got to.
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-top is 'top' for virtual machines. Tiny program with many
powerful monitoring features, net stats, disk stats, logging, etc.
http://people.redhat.com/~rjones/virt-top
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2 comments
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participants (2)
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Zetan Drableg