Created attachment 111624 [details]
strace of "systemctl restart postgresql-9.3.service"

Running any systemctl operation like start/stop/restart makes systemctl hang forever not returning to the prompt.

This is not restricted to any specific services but happens for any.

Running systemctl in strace shows this(full log attached):
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\4\1\1Q\0\0\0\22\0\0\0z\0\0\0\1\1o\0\31\0\0\0", 24}], msg_controllen=32, {cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS{pid=1, uid=0, gid=0}}, msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"/org/freedesktop/systemd1\0\0\0\0\0\0\0"..., 201}], msg_controllen=32, {cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS{pid=1, uid=0, gid=0}}, msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 201
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\4\1\1!\2\0\0\23\0\0\0\236\0\0\0\1\1o\0;\0\0\0", 24}], msg_controllen=32, {cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS{pid=1, uid=0, gid=0}}, msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"/org/freedesktop/systemd1/unit/p"..., 697}], msg_controllen=32, {cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS{pid=1, uid=0, gid=0}}, msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 697
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\4\1\1\304\2\0\0\24\0\0\0\236\0\0\0\1\1o\0;\0\0\0", 24}], msg_controllen=32, {cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS{pid=1, uid=0, gid=0}}, msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"/org/freedesktop/systemd1/unit/p"..., 860}], msg_controllen=32, {cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS{pid=1, uid=0, gid=0}}, msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 860
recvmsg(3, 0x7fffe2d419e0, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
ppoll([{fd=3, events=POLLIN}], 1, NULL, NULL, 8
Attaching strace shows first only this line:
ppoll([{fd=3, events=POLLIN}], 1, NULL, NULL, 8


I was able to bisect this down to ebd011d9 (http://cgit.freedesktop.org/systemd/systemd/commit/?id=ebd011d9)
Kernel is 3.18.1 (no kdbus)
dbus version is 1.8.10