[lxc-users] OOMScoreAdjust= in dbus.service on systemd-based

[Christian Brauner]

On Thu, Feb 05, 2015 at 10:19:15PM +0100, Christian Brauner wrote:
> On Thu, Feb 05, 2015 at 10:14:37PM +0100, Christian Brauner wrote:
> > On Thu, Feb 05, 2015 at 09:25:12PM +0100, Christian Brauner wrote:
> > > I hope so, I've just patched my systemd source code and it's currently
> > > compiling. :) One thing I'm currently not clear about is whether the
> > > host or the container systemd needs to be patched... I'll go with the
> > > host. :)
> > > 
> > > Christian
> > 
> > I think this is the patch on cgit for systemd you were talking about,
> > Serge?
> > http://cgit.freedesktop.org/systemd/systemd/patch/?id=d5243d628624038567c576e9b69c1d775eb05a05
> > 
> > I downloaded and succesfully applied it but systemd stills seems to be
> > hanging no matter if I patch the host or the container... I'm just
> > compiling it again to make sure I made no mistake. Did you already have
> > the chance to test it yourself?
> > 
> > Christian
> 
> Starting the container without OOMScoreAdjust commented out gives me
> (when I strace /sbin/init from the host):
> 
> epoll_wait(4, {{EPOLLIN, {u32=3, u64=3}}}, 29, 0) = 1
> clock_gettime(CLOCK_BOOTTIME, {2116, 108967782}) = 0
> read(25, "\1\0\0\0\0\0\0\0", 8)         = 8
> timerfd_settime(25, TFD_TIMER_ABSTIME, {it_interval={0, 0}, it_value={2062, 785850000}}, NULL) = 0
> 
> Christian

If I boot with the OOMScoreAdjust in dbus.service enabled with the patched
applied on the host and in the container and strace /sbin/init again I get:

open("/sys/fs/cgroup/systemd/user.slice/user-1000.slice/session-c1.scope/chb/arch/system.slice/dbus.service/cgroup.procs", O_RDONLY|O_CLOEXEC) = 32
fstat(32, {st_mode=S_IFREG|0644, st_size=5, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa470213000
read(32, "232\n", 4096)                 = 4
close(32)                               = 0
munmap(0x7fa470213000, 4096)            = 0
open("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC) = 32
ioctl(32, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(32, TIOCGWINSZ, {ws_row=49, ws_col=84, ws_xpixel=681, ws_ypixel=747}) = 0
writev(32, [{"[", 1}, {"\33[32m  OK  \33[0m", 15}, {"] ", 2}, {"Started D-Bus System Message Bus"..., 33}, {"\n", 1}], 5) = 52
close(32)                               = 0
sendmsg(30, {msg_name(0)=NULL, msg_iov(9)=[{"PRIORITY=6\nSYSLOG_FACILITY=3\nCOD"..., 131}, {"UNIT=dbus.service", 17}, {"\n", 1}, {"MESSAGE_ID=39f53479d3a045ac8e117"..., 43}, {"\n", 1}, {"MESSAGE=Started D-Bus System Mes"..., 41}, {"\n", 1}, {"RESULT=done", 11}, {"\n", 1}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 247
epoll_ctl(4, EPOLL_CTL_DEL, 3, NULL)    = 0
socket(PF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 32
setsockopt(32, SOL_SOCKET, SO_PASSCRED, [0], 4) = 0
setsockopt(32, SOL_SOCKET, 0x22 /* SO_??? */, [0], 4) = 0
getsockopt(32, SOL_SOCKET, SO_RCVBUF, [212992], [4]) = 0
setsockopt(32, SOL_SOCKET, 0x21 /* SO_??? */, [8388608], 4) = -1 EPERM (Operation not permitted)
setsockopt(32, SOL_SOCKET, SO_RCVBUF, [8388608], 4) = 0
getsockopt(32, SOL_SOCKET, SO_SNDBUF, [212992], [4]) = 0
setsockopt(32, SOL_SOCKET, 0x20 /* SO_??? */, [8388608], 4) = -1 EPERM (Operation not permitted)
setsockopt(32, SOL_SOCKET, SO_SNDBUF, [8388608], 4) = 0
connect(32, {sa_family=AF_LOCAL, sun_path="/var/run/dbus/system_bus_socket"}, 33) = 0
getsockopt(32, SOL_SOCKET, SO_PEERCRED, {pid=1, uid=0, gid=0}, [12]) = 0
fstat(32, {st_mode=S_IFSOCK|0777, st_size=0, ...}) = 0
getsockopt(32, SOL_SOCKET, SO_ACCEPTCONN, [0], [4]) = 0
getsockname(32, {sa_family=AF_LOCAL, NULL}, [2]) = 0
geteuid()                               = 0
sendmsg(32, {msg_name(0)=NULL, msg_iov(3)=[{"\0AUTH EXTERNAL ", 15}, {"30", 2}, {"\r\nNEGOTIATE_UNIX_FD\r\nBEGIN\r\n", 28}], msg_controllen=0, msg_flags=0}, MSG_DONTWAIT|MSG_NOSIGNAL) = 45
recvmsg(32, 0x7fffe704ddd0, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
ppoll([{fd=32, events=POLLIN}], 1, {24, 999780000}, NULL, 8^CProcess 11517 detached
 <detached ...>

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