Re: [Libguestfs] Fwd: [Qemu-devel] debugging qemu-nbd.c
> libguestfs: qemu version 1.4
> libguestfs: command: run:
> /home/skippy/Downloads/qemu/latest-build/install_dir/bin/qemu-system-x86_64
> libguestfs: command: run: \ -nographic
> libguestfs: command: run: \ -machine accel=kvm:tcg
> libguestfs: command: run: \ -device ?
> libguestfs: [00025ms] finished testing qemu features
> libguestfs: [00025ms] r from fork: 13658 \n
> \ libguestfs: error: appliance closed the connection unexpectedly,
> see earlier error messages
Either some output is missing, or something very strange is happening
in the appliance back end. Would advise adding lots more debugging to
the code that starts at this comment:
if (r == 0) { /* Child (qemu). */
I don't think the error has anything to do with qemu-nbd. It doesn't
even get to the point where libguestfs prints the qemu command line.
Maybe I mucked up libguestfs logging with my own logging... don't see
how but it's possible.
Here are the log statements I put in for the qemu-child.
I ended with listing the args in g->app.cmdline just before
this statement:
execv (g->qemu, g->app.cmdline); /* Run qemu. */
in guestfs forked child - pid for qemu process: 29439
qemu child - before if (has_appliance_drive)
qemu child - before Set up virtio-serial
qemu child - before Dump the command line (after setting up stderr)
qemu child - before * Put qemu in a new process group. *
/usr/local/bin/qemu-system-x86_64
-global
virtio-blk-pci.scsi=off
-nodefconfig
-nodefaults
-nographic
-device
virtio-scsi-pci,id=scsi
-drive
file=nbd:localhost:3000,format=raw,id=hd0,if=none
-device
scsi-hd,drive=hd0
-drive
file=../appliance/root,snapshot=on,id=appliance,if=none,cache=unsafe
-device
scsi-hd,drive=appliance
-machine
accel=kvm:tcg
-m
500
-no-reboot
-no-hpet
-device
virtio-serial
-serial
stdio
-device
sga
-chardev
socket,path=/tmp/libguestfsdeuFRl/guestfsd.sock,id=channel0
-device
virtserialport,chardev=channel0,name=org.libguestfs.channel.0
-kernel
../appliance/kernel
-initrd
../appliance/initrd
-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
-Skippy