[Fedora-xen] Re: Xen utilities hanging on Fedora 24

On Tue, May 31, 2016 at 03:42:14PM -0400, W. Michael Petullo wrote:
> 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:

That is most likely to due to:

[Bug 1322625] SELinux is preventing systemd-modules from using the 'sys_module' capabilities.

which causes another issues as well.

>
> 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
> --
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