[root@undercloudvm ~]# ps -ef | grep virt-customize
root     23465 13339  0 09:59 pts/2    00:00:00 virt-customize -vx --smp 2 -m 2048 -a /home/stack/undercloud.qcow2 --run /home/stack/convert_image.sh
root     23473 23465  0 09:59 pts/2    00:00:00 virt-customize -vx --smp 2 -m 2048 -a /home/stack/undercloud.qcow2 --run /home/stack/convert_image.sh

[root@undercloudvm ~]# ps -ef | grep 23465
root     23465 13339  0 09:59 pts/2    00:00:00 virt-customize -vx --smp 2 -m 2048 -a /home/stack/undercloud.qcow2 --run /home/stack/convert_image.sh
root     23472 23465 99 09:59 pts/2    00:05:22 /usr/libexec/qemu-kvm -global virtio-blk-pci.scsi=off -enable-fips -nodefaults -display none -machine accel=tcg -smp 2 -m 2048 -no-reboot -rtc driftfix=slew -no-hpet -global kvm-pit.lost_tick_policy=discard -kernel /var/tmp/.guestfs-0/appliance.d/kernel -initrd /var/tmp/.guestfs-0/appliance.d/initrd -object rng-random,filename=/dev/urandom,id=rng0 -device virtio-rng-pci,rng=rng0 -device virtio-scsi-pci,id=scsi -drive file=/home/stack/undercloud.qcow2,cache=writeback,discard=unmap,id=hd0,if=none -device scsi-hd,drive=hd0 -drive file=/var/tmp/.guestfs-0/appliance.d/root,snapshot=on,id=appliance,cache=unsafe,if=none,format=raw -device scsi-hd,drive=appliance -device virtio-serial-pci -serial stdio -device sga -chardev socket,path=/tmp/libguestfs9saFcm/guestfsd.sock,id=channel0 -device virtserialport,chardev=channel0,name=org.libguestfs.channel.0 -netdev user,id=usernet,net=169.254.0.0/16 -device virtio-net-pci,netdev=usernet -append panic=1 console=ttyS0 edd=off udevtimeout=6000 udev.event-timeout=6000 no_timer_check lpj=2394000 printk.time=1 cgroup_disable=memory usbcore.nousb cryptomgr.notests tsc=reliable 8250.nr_uarts=1 root=/dev/sdb selinux=0 guestfs_verbose=1 guestfs_network=1 TERM=screen
root     23473 23465  0 09:59 pts/2    00:00:00 virt-customize -vx --smp 2 -m 2048 -a /home/stack/undercloud.qcow2 --run /home/stack/convert_image.sh

[root@undercloudvm ~]# strace -f -p 23473
strace: Process 23473 attached
restart_syscall(<... resuming interrupted nanosleep ...>) = 0
kill(23472, SIG_0)                      = 0
kill(23465, SIG_0)                      = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL, [], SA_RESTORER, 0x7f8582eb2280}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, 0x7ffe6e347eb0)       = 0
kill(23472, SIG_0)                      = 0
kill(23465, SIG_0)                      = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL, [], SA_RESTORER, 0x7f8582eb2280}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, 0x7ffe6e347eb0)       = 0
kill(23472, SIG_0)                      = 0
kill(23465, SIG_0)                      = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL, [], SA_RESTORER, 0x7f8582eb2280}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, 0x7ffe6e347eb0)       = 0
kill(23472, SIG_0)                      = 0
kill(23465, SIG_0)                      = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL, [], SA_RESTORER, 0x7f8582eb2280}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, 0x7ffe6e347eb0)       = 0
kill(23472, SIG_0)                      = 0
kill(23465, SIG_0)                      = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL, [], SA_RESTORER, 0x7f8582eb2280}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, ^Cstrace: Process 23473 detached
 <detached ...>