The vif --list failed to report any interfaces

[Alfred Shen]

On a compute with 46+ VMs, running vif --list failed to report any interface. Did the no buffer space available indicate not enough space allocated?

[<email address hidden> lib64]# strace vif --list
execve("/usr/bin/vif", ["vif", "--list"], [/* 22 vars */]) = 0
brk(0) = 0x61b000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1951a04000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=32589, ...}) = 0
mmap(NULL, 32589, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f19519fc000
close(3) = 0
open("/lib64/libc.so.6", O_RDONLY) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0p\356\1\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1921096, ...}) = 0
mmap(NULL, 3750152, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f1951452000
mprotect(0x7f19515dc000, 2097152, PROT_NONE) = 0
mmap(0x7f19517dc000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x18a000) = 0x7f19517dc000
mmap(0x7f19517e1000, 18696, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f19517e1000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f19519fb000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f19519fa000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f19519f9000
arch_prctl(ARCH_SET_FS, 0x7f19519fa700) = 0
mprotect(0x7f19517dc000, 16384, PROT_READ) = 0
mprotect(0x7f1951a05000, 4096, PROT_READ) = 0
munmap(0x7f19519fc000, 32589) = 0
brk(0) = 0x61b000
brk(0x63c000) = 0x63c000
socket(PF_NETLINK, SOCK_DGRAM, 16) = 3
bind(3, {sa_family=AF_NETLINK, pid=0, groups=00000000}, 12) = 0
sendmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{" \0\0\0\20\0\1\0\0\0\0\0\0\0\0\0\3\0\0\0\f\0\2\0vrouter\0", 32}], msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"X\0\0\0\20\0\0\0\0\0\0\0\233\337\0\0\1\2\0\0\f\0\2\0vrouter\0"..., 4096}], msg_controllen=0, msg_flags=0}, MSG_DONTWAIT) = 88
sendmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"\3\1\0\0\30\0\1\0\1\0\0\0\0\0\0\0\1\0\0\0\357\0\1\0\0\0\0\20vr_i"..., 259}], msg_controllen=0, msg_flags=0}, 0) = 259
recvmsg(3, 0x7fffbe4cbd70, MSG_DONTWAIT) = -1 ENOBUFS (No buffer space available)
exit_group(0) = ?
[<email address hidden> lib64]# ldd /usr/bin/vif
 linux-vdso.so.1 => (0x00007fff85dff000)
 libc.so.6 => /lib64/libc.so.6 (0x00007fee345d1000)
 /lib64/ld-linux-x86-64.so.2 (0x00007fee3496e000)

[Anand H. Krishnan (anandhk)]

One possibility is that memory is really low when the command was run . Can't really say. If you have a system to look at, I could look at and let you know.