DebuggingNetworkManager
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== A Testcase == A good testcase is a step by step instruction to reproduce your bug starting with driver unloaded and NetworkManager stopped. With Karmic and above: Stop NetworkManager {{{ sudo stop network-manager }}} Prior to Karmic (9.10): Kill NetworkManager {{{ sudo killall NetworkManager }}} To unload your driver {{{ sudo modprobe -r DRIVER }}}. Then load the driver {{{ sudo modprobe DRIVER }}} and start NetworkManager: With Karmic and up: {{{ sudo start network-manager }}} Up until Karmic: {{{ sudo NetworkManager }}} === Capture Log === |
== Getting debug logs == First, make sure you have the debug helper script: [[http://cgit.freedesktop.org/NetworkManager/NetworkManager/tree/test/debug-helper.py]]. You can then follow developers' intructions on a bug report for the exact command line to use; or run it directly as such: * Getting NetworkManager debug logs {{{ sudo python debug-helper.py --nm debug }}} Then get the logs which will be written to /var/log/syslog. To disable it, pass '''info''' instead of '''debug''' in the above command, or reboot. In the above command, you can also include specific domains to enable logging for, see ''''sudo /usr/sbin/NetworkManager --help'''': {{{ sudo python debug-helper.py --nm debug --domains core ip4 ip6 }}} * Getting ModemManager debug logs {{{ sudo python debug-helper.py --mm debug }}} Then get the logs which will be written to /var/log/syslog. To disable it, pass '''info''' instead of '''debug''' in the above command, or reboot. * Getting wpasupplicant debug logs {{{ sudo python debug-helper.py --wpa debug }}} Then get the logs which will be written to /var/log/syslog. To disable it, pass '''info''' instead of '''debug''' in the above command, or reboot. Mixing and mashing the above is perfectly acceptable as well if you want to see how NetworkManager and other parts of the stack interact together. |
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=== Serial Log (Mobile Broadband) === ==== With ModemManager ==== {{{ # become root sudo -i # stop NM stop network-manager # stop ModemManager killall -TERM modem-manager # start ModemManager in debug mode modem-manager --debug 2>&1 | tee ~/modemmanager.log # In another terminal, start NetworkManager: NM_PPP_DEBUG=1 /usr/sbin/NetworkManager --no-daemon 2>&1 | tee ~/networkmanager.log }}} Then retrieve both networkmanager.log and modemmanager.log from your home directory and attach them to your bug report. ==== Before ModemManager ==== {{{ # become root sudo su # stop NM /etc/init.d/NetworkManager stop # start with serial log and tee it in a log file NM_SERIAL_DEBUG=1 NetworkManager --no-daemon 2>&1 | tee /tmp/nm-serial.txt }}} ... reproduce and attach the nm-serial.txt |
== Handling 3G / modem issues == An few extra things that are very helpful to add in case of issues with 3G: The output of udevadm for tty devices, and output of lsusb: {{{ $ udevadm info --query=all --path=/sys/class/tty/... --attribute-walk }}} {{{ $ lsusb }}} == A Testcase == A good testcase is a step by step instruction to reproduce your bug starting with driver unloaded and NetworkManager stopped. Stop NetworkManager {{{ sudo stop network-manager }}} To unload your driver {{{ sudo modprobe -r DRIVER }}}. Then load the driver {{{ sudo modprobe DRIVER }}} and start NetworkManager: {{{ sudo start network-manager }}} |
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deb http://ddebs.ubuntu.com/~ubuntu-archive/ddebs/ hardy main universe | deb http://ddebs.ubuntu.com/ natty main universe |
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deb http://ddebs.ubuntu.com/~ubuntu-archive/ddebs/ intrepid main universe | deb http://ddebs.ubuntu.com/ oneiric main universe |
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sudo apt-get install network-manager-dbgsym libnm-util0-dbgsym libnm-glib0-dbgsym libglib2.0-0-dbgsym or from jaunty on: sudo apt-get install network-manager-dbgsym libnm-util1-dbgsym libnm-glib0-dbgsym libglib2.0-0-dbgsym }}} Then stop NetworkManager (hardy): {{{ sudo /etc/dbus-1/event.d/25NetworkManager stop }}} or stop NetworkManager (intrepid): {{{ sudo /etc/init.d/NetworkManager stop |
sudo apt-get install network-manager-dbgsym libnm-util2-dbgsym libnm-glib4-dbgsym libglib2.0-0-dbgsym }}} Then stop NetworkManager: {{{ sudo stop network-manager |
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== Debugging 3G modems == '''Note:''' since karmic NM does not handle modems on its own, but uses modem-manager: follow the DebuggingModemmanager instructions. In case your modem is not detected, open a bug and attach the following information: if a modem is not detected, but the driver is loaded and so on, you should have /sys/class/tty/ttyUSB or ttyACM or other entries run {{{ $ /lib/udev/nm-modem-probe --verbose --export /sys/class/tty/ttyUSB }}} or {{{ $ /lib/udev/nm-modem-probe --verbose --export /sys/class/tty/ttyACM }}} to see if it detects GSM or CDMA capabilities File a bug by running {{{ $ ubuntu-bug network-manager }}} and add the output of the previous nm-modem-probe command, complete syslog, output of {{{ $ udevadm info --query=all --path=/sys/class/tty/... --attribute-walk }}} and {{{ $ lshal }}} |
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sudo apt-get install --reinstall network-manager libnm-util0 libnm-glib0 or from jaunty on sudo apt-get install --reinstall network-manager libnm-util1 libnm-glib0 |
sudo apt-get install --reinstall network-manager libnm-util2 libnm-glib4 |
This page is part of the debugging series — pages with debugging details for a variety of Ubuntu packages. |
Bug Summary
If a network-manager bug report is about not being able to connect the title or summary should be in the format:
"[CHIPSET] cannot connect to (ENCRYPT_METHOD)"
where the CHIPSET is the wireless driver used and ENCRYPT_METHOD is the encryption method used by your wireless network.
Understanding your bug and getting more information
There is a lot of debugging information available on the GNOME Live wiki: NetworkManager/Debugging.
You can also take a look at Darren Albers' FAQ.
There is additional information on DebuggingNetworkManager/ReasonCodes for disconnection and network changes available.
Getting debug logs
First, make sure you have the debug helper script: http://cgit.freedesktop.org/NetworkManager/NetworkManager/tree/test/debug-helper.py.
You can then follow developers' intructions on a bug report for the exact command line to use; or run it directly as such:
Getting NetworkManager debug logs
sudo python debug-helper.py --nm debug
Then get the logs which will be written to /var/log/syslog. To disable it, pass info instead of debug in the above command, or reboot.
In the above command, you can also include specific domains to enable logging for, see 'sudo /usr/sbin/NetworkManager --help':
sudo python debug-helper.py --nm debug --domains core ip4 ip6
Getting ModemManager debug logs
sudo python debug-helper.py --mm debug
Then get the logs which will be written to /var/log/syslog. To disable it, pass info instead of debug in the above command, or reboot.
- Getting wpasupplicant debug logs
sudo python debug-helper.py --wpa debug
Then get the logs which will be written to /var/log/syslog. To disable it, pass info instead of debug in the above command, or reboot.
Mixing and mashing the above is perfectly acceptable as well if you want to see how NetworkManager and other parts of the stack interact together.
In order to understand whats going on and track down issues, its good to have a full log. To do so, capture the complete test case and submit the whole file (don't cut out what you think is important). Please add markers in the log file so the bug triager can easily see what actions the user takes at what point of time (this isn't essential, but helps a lot).
To capture the syslog, do:
tail -n0 -f /var/log/syslog > /tmp/syslog
and to stop capturing do Ctrl-C (you will have to type your other commands in an other window or tab)
Adding markers is just like adding new lines with an editor that show the triager what happened at what point of time. You can also do this on the fly as you test with the command logger "[ clicked on wireless network 'ubuntu']" .
Example marker:
Sep 6 08:12:30 ... [ clicked on wireless network 'ubuntu'] Sep 6 08:12:31 ... ...
Handling 3G / modem issues
An few extra things that are very helpful to add in case of issues with 3G:
The output of udevadm for tty devices, and output of lsusb:
$ udevadm info --query=all --path=/sys/class/tty/... --attribute-walk
$ lsusb
A Testcase
A good testcase is a step by step instruction to reproduce your bug starting with driver unloaded and NetworkManager stopped.
Stop NetworkManager
sudo stop network-manager
To unload your driver sudo modprobe -r DRIVER .
Then load the driver sudo modprobe DRIVER and start NetworkManager:
sudo start network-manager
Debugging Crashes
To install debug symbols, add the following line to your /etc/apt/sources.list
deb http://ddebs.ubuntu.com/ natty main universe
or
deb http://ddebs.ubuntu.com/ oneiric main universe
Then install the appropriate dbgsym packages:
sudo apt-get update sudo apt-get install network-manager-dbgsym libnm-util2-dbgsym libnm-glib4-dbgsym libglib2.0-0-dbgsym
Then stop NetworkManager:
sudo stop network-manager
Run NetworkManager in a debugger
sudo gdb /usr/sbin/NetworkManager ... (gdb) run --no-daemon
Once it crashes get a backtrace
(gdb) bt ... (gdb) bt full ... (gdb) thread apply all bt full ...
and attach the backtrace above together with your /var/log/syslog to the bug.
Driver Logs
When a bug appears to be driver related or you are asked by a bug triager to submit a driver enabled log, you need to enable driver logging right before you start to capture your testcase. How to do that depends on the driver you use and whether it has been with compiled with debug support.
Driver Specific Info
IPW (2100,2200, 3945)
Logging
# either during module load: modprobe ipw{2100,2200,3945} debug=65535 # or when already loaded you can change the debug_level through /sys/bus/.../drivers/ echo 65535 > /sys/bus/pci/drivers/ipw{2100,2200,3945}/debug_level
Compiling Module Sources
For debugging purpose or to verify a fix, a developer might ask you to build your driver module from source. for ipwXXXX you can do that by:
# install required headers and build tools sudo apt-get install module-assistant sudo module assistant update sudo module assistant prepare # build the driver cd /path/to/ipw-XXXX make IEEE80211_IGNORE_DUPLICATE=y SHELL=/bin/bash # backup your old ipw driver: sudo cp /lib/modules/$(uname -r)/kernel/drivers/net/wireless/ipw3945/ipw3945.ko $HOME # install the new driver cp ipw3945.ko /lib/modules/$(uname -r)/kernel/drivers/net/wireless/ipw3945/ depmod -a # kill regulatory daemon ipw3945d-$(uname -r) --kill #load new module modprobe ipw3945
Bug Tags
These tags allow isolation of bugs into smaller groups, providing an easier and faster way to work on specific issues.
Tag |
Use case |
Bugs in which the madwifi driver is in use |
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Bugs in which the ndiswrapper driver is in use |
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Bugs related to either openvpn, vpnc or pptp network-manager vpn modules |
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Bugs in which WEP encryption is used |
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Bugs in which WPA encryption is used |
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Bugs in which WPA2 encryption is used |
The previously described tags are specific to the NetworkManager application, if you need more general tags please visit Bugs/Tags page.
Testing a patch
It's often a good idea to check in the NM trunk PPA to see if an updated version of NetworkManager fixes the bugs you see. Be careful though, as those are daily builds that may break other things, and are to be considered unstable.
Sometimes a developer might ask you to test a quick patch he came up with. Below an example how to do that for network-manager. If your bug is for network-manager-applet or some other package, just replace the package name
# get build dependencies sudo apt-get install build-essential fakeroot devscripts sudo apt-get build-dep network-manager # get sources sudo apt-get source network-manager # cd into the source directory cd network-manager-*/ # apply the patch (note that -p1 could also be -p0 if the patch was created without an extra prefix in the diff path) patch -p1 < /tmp/yourdownloadedpatch.diff # build binaries only without signing debuild -b -uc # packages are produced in parent directory cd ../ # install all nm packages sudo dpkg -i network-manager*.deb libnm-*.deb
Note that you didnt change the version of the package. so to get back to the "official" current version you need to do something like:
sudo apt-get install --reinstall network-manager libnm-util2 libnm-glib4
if you installed other packages from the build, do the same for them.
DebuggingNetworkManager (last edited 2023-06-27 20:21:45 by hellsworth)