Xen utilities hanging on Fedora 24
by W. Michael Petullo
Has anyone else seen things like "xl list" or xentop hang on Fedora 24?
# rpm -q kernel xen
kernel-4.5.5-300.fc24.x86_64
xen-4.6.1-10.fc24.x86_64
Running "strace xl list" produces the following, which seems to indicate
that the hang occurs when "xl list" writes to /dev/xen/xenbus:
access("/dev/xen/xenbus", F_OK) = 0
stat("/dev/xen/xenbus", {st_mode=S_IFCHR|0600, st_rdev=makedev(10, 62), ...}) = 0
open("/dev/xen/xenbus", O_RDWR) = 6
open("/etc/xen/xl.conf", O_RDONLY) = 7
fstat(7, {st_mode=S_IFREG|0644, st_size=33, ...}) = 0
fstat(7, {st_mode=S_IFREG|0644, st_size=33, ...}) = 0
read(7, "vif.default.script = \"vif-ethos\""..., 4096) = 33
close(7) = 0
ioctl(5, _IOC(0, 0x50, 0x00, 0x30), 0x7ffdafc79e90) = 262150
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_LOCKED, -1, 0) = 0x7fef0d788000
madvise(0x7fef0d788000, 4096, MADV_DONTFORK) = 0
ioctl(5, _IOC(0, 0x50, 0x00, 0x30), 0x7ffdafc79e90) = 0
ioctl(5, _IOC(0, 0x50, 0x00, 0x30), 0x7ffdafc79e90) = 0
ioctl(5, _IOC(0, 0x50, 0x00, 0x30), 0x7ffdafc79e90) = 0
ioctl(5, _IOC(0, 0x50, 0x00, 0x30), 0x7ffdafc79e90) = 0
ioctl(5, _IOC(0, 0x50, 0x00, 0x30), 0x7ffdafc79e90) = 0
ioctl(5, _IOC(0, 0x50, 0x00, 0x30), 0x7ffdafc79e90) = 4096
ioctl(5, _IOC(0, 0x50, 0x00, 0x30), 0x7ffdafc79e90) = 0
mmap(NULL, 102400, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_LOCKED, -1, 0) = 0x7fef0d76f000
madvise(0x7fef0d76f000, 102400, MADV_DONTFORK) = 0
ioctl(5, _IOC(0, 0x50, 0x00, 0x30), 0x7ffdafc61c70) = 0
madvise(0x7fef0d76f000, 102400, MADV_DOFORK) = 0
munmap(0x7fef0d76f000, 102400) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_LOCKED, -1, 0) = 0x7fef0d786000
madvise(0x7fef0d786000, 8192, MADV_DONTFORK) = 0
ioctl(5, _IOC(0, 0x50, 0x00, 0x30), 0x7ffdafc60c70) = 0
madvise(0x7fef0d786000, 8192, MADV_DOFORK) = 0
munmap(0x7fef0d786000, 8192) = 0
fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 4), ...}) = 0
write(1, "Name "..., 73Name ID Mem VCPUs State Time(s)
) = 73
rt_sigaction(SIGPIPE, {SIG_IGN, [], SA_RESTORER, 0x7fef0ca7cc10}, {SIG_DFL, [], 0}, 8) = 0
write(6, "\2\0\0\0\0\0\0\0\0\0\0\0\25\0\0\0", 16) = 16
write(6, "/local/domain/0/name\0", 21 # [ HANGS HERE. ]
--
Mike
:wq
7 years, 10 months
Supported file-backed disk formats
by W. Michael Petullo
What file-backed disk formats are supported by Xen using a Fedora Dom0? I
am testing xen-4.6.1-8.fc24.x86_64, and I have not been able to get the
"qcow2" and "vhd" formats to work. "Qcow" version 1 works fine with:
disk = [ "tap2:qcow:/var/lib/xen/images/test-data.xen-qcow,xvdb,w" ]
However, when I try qcow2, the VM detects the disk, but "fdisk /dev/sdb"
says:
fdisk: cannot open /dev/sdb: No such file or directory
When I try vhd, the VM kernel does not even detect the disk.
--
Mike
:wq
7 years, 10 months
