Cannot connect to netlink socket??

Any idea what can cause this? The system was working fine earlier, so it is compiled with netlink support, etc.

Last thing someone did was to add 258 mac-vlans on top of an ethernet port. Removing macvlan module did not improve things.

'ifconfig -a' works fine.

This is on a 4.0.4 (+ local hacks) kernel, nothing overly weird in dmesg, and no new dmesg info when this fails to work:

strace ip addr show

...

socket(PF_NETLINK, SOCK_RAW|SOCK_CLOEXEC, NETLINK_ROUTE) = 3
setsockopt(3, SOL_SOCKET, SO_SNDBUF, [32768], 4) = 0
setsockopt(3, SOL_SOCKET, SO_RCVBUF, [1048576], 4) = 0
bind(3, {sa_family=AF_NETLINK, pid=0, groups=00000000}, 12) = 0
getsockname(3, {sa_family=AF_NETLINK, pid=16631, groups=00000000}, [12]) = 0
sendto(3, "(\0\0\0\22\0\1\3%m\251U\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 40, 0, NULL, 0) = -1 ECONNREFUSED (Connection refused)

dup(2)                                  = 4
fcntl(4, F_GETFL)                       = 0x8002 (flags O_RDWR|O_LARGEFILE)
brk(0)                                  = 0x1679000
brk(0x169a000)                          = 0x169a000
brk(0)                                  = 0x169a000

fstat(4, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 3), ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb40d3c9000 write(4, "Cannot send dump request: Connec"..., 45Cannot send dump request: Connection refused ) = 45

close(4)                                = 0
munmap(0x7fb40d3c9000, 4096)            = 0
exit_group(1)                           = ?

+++ exited with 1 +++

A reboot 'fixed' things, and we have not been able to reproduce the problem.

Thanks,
Ben

Ben Greear <[email protected]>
Candela Technologies Inc  http://www.candelatech.com