Bug#901834: systemd-networkd fails to start the network service because of race condition to dbus

[tobias.karnat at remondis.de]

Package: systemd
Version: 232-25+deb9u2
Severity: important

Hello,

we see the following output in syslog after reboots:
systemd-networkd[288]: Could not connect to bus: Permission denied
systemd[1]: systemd-networkd.service: Main process exited, code=exited, 
status=1/FAILURE
systemd[1]: Failed to start Network Service.
systemd[1]: systemd-networkd.service: Unit entered failed state.
systemd[1]: systemd-networkd.service: Failed with result 'exit-code'.
systemd[1]: systemd-networkd.service: Service has no hold-off time, 
scheduling restart.
systemd[1]: Stopped Network Service

After we patched systemd with the following upstream patch, it is starting 
successful again:
https://github.com/systemd/systemd/commit/701afcbf125ee41c82cd49091806f93d24df562a

diff --git a/src/network/networkd-manager.c 
b/src/network/networkd-manager.c
index c28088d3a3c..45f9b3d359b 100644
--- a/src/network/networkd-manager.c
+++ b/src/network/networkd-manager.c
@@ -136,10 +136,9 @@ int manager_connect_bus(Manager *m) {
         assert(m);

         r = sd_bus_default_system(&m->bus);
-        if (r == -ENOENT) {
+        if (r < 0) {
                 /* We failed to connect? Yuck, we must be in early
-                 * boot. Let's try in 5s again. As soon as we have
-                 * kdbus we can stop doing this... */
+                 * boot. Let's try in 5s again. */

                 log_debug_errno(r, "Failed to connect to bus, trying 
again in 5s: %m");

diff --git a/src/resolve/resolved-bus.c b/src/resolve/resolved-bus.c
index 5aa23485761..bf822d3aaa5 100644
--- a/src/resolve/resolved-bus.c
+++ b/src/resolve/resolved-bus.c
@@ -1644,8 +1644,7 @@ int manager_connect_bus(Manager *m) {
         r = sd_bus_default_system(&m->bus);
         if (r < 0) {
                 /* We failed to connect? Yuck, we must be in early
-                 * boot. Let's try in 5s again. As soon as we have
-                 * kdbus we can stop doing this... */
+                 * boot. Let's try in 5s again. */

                 log_debug_errno(r, "Failed to connect to bus, trying 
again in 5s: %m");

Mit freundlichen Grüßen / With kind regards

Tobias Karnat
Infrastructure Operations
Systems Engineer

REMONDIS IT Services GmbH & Co. KG
Brunnenstr. 138 // 44536 Lünen // Deutschland
T +49 2306 106-8869 // F +49 2306 106-399-8869
tobias.karnat at remondis.de // remondis-it.de

REMONDIS IT Services GmbH & Co. KG // Brunnenstr. 138 // 44536 Lünen // 
Deutschland  // Amtsgericht Dortmund, HRA 17891 // Persönlich haftende 
Gesellschafterin: REMONDIS IT Services Verwaltungs GmbH, 44536 Lünen, 
Amtsgericht Dortmund, HRB 26665 // Geschäftsführer: Josef Brösterhaus, 
Lars Karnowsky

-- Package-specific info:

-- System Information:
Debian Release: 9.4
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-6-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), 
LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages systemd depends on:
ii  adduser         3.115
ii  libacl1         2.2.52-3+b1
ii  libapparmor1    2.11.0-3+deb9u2
ii  libaudit1       1:2.6.7-2
ii  libblkid1       2.29.2-1+deb9u1
ii  libc6           2.24-11+deb9u3
ii  libcap2         1:2.25-1
ii  libcryptsetup4  2:1.7.3-4
ii  libgcrypt20     1.7.6-2+deb9u3
ii  libgpg-error0   1.26-2
ii  libidn11        1.33-1
ii  libip4tc0       1.6.0+snapshot20161117-6
ii  libkmod2        23-2
ii  liblz4-1        0.0~r131-2+b1
ii  liblzma5        5.2.2-1.2+b1
ii  libmount1       2.29.2-1+deb9u1
ii  libpam0g        1.1.8-3.6
ii  libseccomp2     2.3.1-2.1
ii  libselinux1     2.6-3+b3
ii  libsystemd0     232-25+deb9u2
ii  mount           2.29.2-1+deb9u1
ii  procps          2:3.3.12-3+deb9u1
ii  util-linux      2.29.2-1+deb9u1

Versions of packages systemd recommends:
ii  dbus            1.10.26-0+deb9u1
ii  libpam-systemd  232-25+deb9u2

Versions of packages systemd suggests:
ii  policykit-1        0.105-18
pn  systemd-container  <none>
pn  systemd-ui         <none>

Versions of packages systemd is related to:
pn  dracut           <none>
ii  initramfs-tools  0.130
ii  udev             232-25+deb9u2

-- Configuration Files:
/etc/systemd/resolved.conf changed [not included]
/etc/systemd/timesyncd.conf changed [not included]

-- no debconf information
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