Comment # 2 on bug 929224 from Christian Hueller

this bug very much looks like

http://lists.freedesktop.org/archives/systemd-devel/2015-February/028510.html

so i tried what was suggested in message 2:

---------------snip--------------------

To make this work, can you reproduce the issue, then use gdb:

1. Type "gdb" to start it
2. Type "attach 1" to attach to PID 1
3. Type "b source_dispatch" to set a break point on the source_dispatch
function
4. Type "c" to continue execution
5. This should then break on the next execution of the source_dispatch function
6. This should happen immediately, after all PID 1 is busy looping
   around a timer. Use "p s->description" to get a short description
   string for the event that is being dispatched. In fact, please use
   "p *s" to get all data about the event, and paste it here.

Thanks!

Lennart
---------------snip--------------------

However, when doing so, i get this:


---------------snip--------------------
skaro:/suse/chuller # gdb
GNU gdb (GDB; openSUSE 13.2) 7.8
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-suse-linux".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://bugs.opensuse.org/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word".

warning: /etc/gdbinit.d/gdb-heap.py: No such file or directory
(gdb) attach 1
Attaching to process 1
Reading symbols from /usr/lib/systemd/systemd...warning: the debug information
found in "/usr/lib/debug//usr/lib/systemd/systemd.debug" does not match
"/usr/lib/systemd/systemd" (CRC mismatch).

warning: the debug information found in
"/usr/lib/debug/usr/lib/systemd/systemd.debug" does not match
"/usr/lib/systemd/systemd" (CRC mismatch).

(no debugging symbols found)...done.
Reading symbols from /lib64/libselinux.so.1...(no debugging symbols
found)...done.
Loaded symbols for /lib64/libselinux.so.1
Reading symbols from /lib64/libpam.so.0...(no debugging symbols found)...done.
Loaded symbols for /lib64/libpam.so.0
Reading symbols from /usr/lib64/libaudit.so.1...(no debugging symbols
found)...done.
Loaded symbols for /usr/lib64/libaudit.so.1
Reading symbols from /lib64/libcap.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/libcap.so.2
Reading symbols from /lib64/libkmod.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/libkmod.so.2
Reading symbols from /lib64/libapparmor.so.1...(no debugging symbols
found)...done.
Loaded symbols for /lib64/libapparmor.so.1
Reading symbols from /usr/lib64/libseccomp.so.2...(no debugging symbols
found)...done.
Loaded symbols for /usr/lib64/libseccomp.so.2
Reading symbols from /lib64/librt.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib64/librt.so.1
Reading symbols from /lib64/libpthread.so.0...(no debugging symbols
found)...done.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Loaded symbols for /lib64/libpthread.so.0
Reading symbols from /lib64/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib64/libc.so.6
Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols
found)...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /usr/lib64/libpcre.so.1...(no debugging symbols
found)...done.
Loaded symbols for /usr/lib64/libpcre.so.1
Reading symbols from /lib64/libdl.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/libdl.so.2
Reading symbols from /usr/lib64/liblzma.so.5...(no debugging symbols
found)...done.
Loaded symbols for /usr/lib64/liblzma.so.5
Reading symbols from /lib64/libz.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib64/libz.so.1
Got object file from memory but can't read symbols: File truncated.
0x00007f788ff3ae4d in nanosleep () from /lib64/libc.so.6
Missing separate debuginfos, use: zypper install
systemd-debuginfo-210-25.16.1.x86_64
(gdb) b source_dispatch
Function "source_dispatch" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 1 (source_dispatch) pending.
(gdb) c
Continuing.

--------------------------snip----------------------------------

After that nothing happened anymore for at least 20 minutes.








---------------snip--------------------
skaro:/suse/chuller # gdb
GNU gdb (GDB; openSUSE 13.2) 7.8
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-suse-linux".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://bugs.opensuse.org/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word".

warning: /etc/gdbinit.d/gdb-heap.py: No such file or directory
(gdb) attach 1
Attaching to process 1
Reading symbols from /usr/lib/systemd/systemd...(no debugging symbols
found)...done.
Reading symbols from /lib64/libselinux.so.1...(no debugging symbols
found)...done.
Loaded symbols for /lib64/libselinux.so.1
Reading symbols from /lib64/libpam.so.0...(no debugging symbols found)...done.
Loaded symbols for /lib64/libpam.so.0
Reading symbols from /usr/lib64/libaudit.so.1...(no debugging symbols
found)...done.
Loaded symbols for /usr/lib64/libaudit.so.1
Reading symbols from /lib64/libcap.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/libcap.so.2
Reading symbols from /lib64/libkmod.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/libkmod.so.2
Reading symbols from /lib64/libapparmor.so.1...(no debugging symbols
found)...done.
Loaded symbols for /lib64/libapparmor.so.1
Reading symbols from /usr/lib64/libseccomp.so.2...(no debugging symbols
found)...done.
Loaded symbols for /usr/lib64/libseccomp.so.2
Reading symbols from /lib64/librt.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib64/librt.so.1
Reading symbols from /lib64/libpthread.so.0...(no debugging symbols
found)...done.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Loaded symbols for /lib64/libpthread.so.0
Reading symbols from /lib64/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib64/libc.so.6
Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols
found)...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /usr/lib64/libpcre.so.1...(no debugging symbols
found)...done.
Loaded symbols for /usr/lib64/libpcre.so.1
Reading symbols from /lib64/libdl.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/libdl.so.2
Reading symbols from /usr/lib64/liblzma.so.5...(no debugging symbols
found)...done.
Loaded symbols for /usr/lib64/liblzma.so.5
Reading symbols from /lib64/libz.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib64/libz.so.1
Got object file from memory but can't read symbols: File truncated.
0x00007f788ff3ae4d in nanosleep () from /lib64/libc.so.6
Missing separate debuginfos, use: zypper install
systemd-debuginfo-210-25.16.1.x86_64
---------------snip--------------------

However, I was unable to insta