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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-13 14:11:00 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-13 14:11:00 +0000
commitaf754e596a8dbb05ed8580c342e7fe02e08b28e0 (patch)
treeb2f334c2b55ede42081aa6710a72da784547d8ea /doc/bugs
parentInitial commit. (diff)
downloadfreeradius-af754e596a8dbb05ed8580c342e7fe02e08b28e0.tar.xz
freeradius-af754e596a8dbb05ed8580c342e7fe02e08b28e0.zip
Adding upstream version 3.2.3+dfsg.upstream/3.2.3+dfsg
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+BUGS
+
+0. INTRODUCTION
+
+ The FreeRADIUS web site is at <URL: https://freeradius.org>, and
+ most information referenced in this document can be found there.
+
+ This is primarily for non-developers of the FreeRADIUS server. If you are
+ able to patch the code to work correctly, then we invite you to join the
+ development list to discuss it. If you're the type who know little about
+ how to code, then this is the place for you!
+
+
+1. YOU FOUND A BUG
+
+ Where the server terminates ungracefully due to a bus error,
+ segmentation violation, or other memory error, you should create
+ a new issue in the issue tracker <URL: http://bugs.freeradius.org>,
+ including information from sections 4 and 5.
+
+ For other issues, you should first discuss them on the users list,
+ to see if anyone can reproduce them. Often there's a simple explanation
+ of why the server behaves as it does, and it's not necessarily a bug in
+ the code, so browse the lists' archives of the last two months, and if
+ you don't see messages about it, ask!
+
+ If the behavior is correct but confusing, we think that's a bug too, and
+ you should file a bug against our documentation.
+
+ For more information about the users list, the lists' archives and the
+ faq, please visit https://freeradius.org/support/
+ Please make sure to READ and RESPECT the house-rules. You will get much
+ better response and much faster if you do!
+
+
+2. CORE DUMPS
+
+ If the server, or one of the accompanying programs core dumps, then
+ you should rebuild the server as follows:
+
+ $ ./configure --enable-developer
+ $ make
+ $ make install
+
+ and then run the program again. You may have to to enable core
+ dumps, via:
+
+ $ ulimit -c unlimited
+
+ When it core dumps, do:
+
+ $ gdb /path/to/executable /path/to/core/file
+
+ Enable logging in gdb via the following commands:
+
+ (gdb) set logging file gdb-radiusd.log
+ (gdb) set logging on
+
+ and follow the instructions in section 4, below.
+
+ You can also enable the "panic_action" given in raddb/radiusd.conf.
+ See the comments in that file for more details about automatically
+ collecting gdb debugging information when the server crashes.
+
+
+3. DEBUGGING A LIVE SERVER
+
+ If you can't get a core dump, or the problem doesn't result in a
+ core dump, you may have to run the server under gdb. To do this,
+ ensure that you have symbols in the binaries (i.e. a non-stripped
+ binary) by re-building the server as described in the previous
+ section. Then, run the server under gdb as follows:
+
+ $ gdb radiusd
+
+ Enable logging in gdb via the following commands:
+
+ (gdb) set logging file gdb-radiusd.log
+ (gdb) set logging on
+
+ Tell gdb to pass any necessary command-line arguments to the
+ server:
+
+ (gdb) set args ...
+
+ Where the "..." are the command-line arguments you normally pass to
+ radiusd. For debugging, you probably want to do:
+
+ (gdb) set args -f
+
+ Then, do:
+
+ (gdb) run
+
+ When something interesting happens, you can hit CTRL-C in the
+ window, and you should be back at the gdb prompt:
+
+ (gdb)
+
+ And follow the instructions in section 4, below.
+
+
+4. OBTAINING USEFUL INFORMATION
+
+ Once you have a core dump loaded into gdb, or FreeRADIUS running under
+ gdb, you may use the commands below to get useful information about
+ the state of the server.
+
+ If the server was built with threads, you can do:
+
+ (gdb) info threads
+
+ Which will give you information about the threads. If the server
+ isn't threaded, that command-line will print a message saying so.
+
+ Then, do:
+
+ (gdb) thread apply all bt full
+
+ If the server isn't threaded, the "thread apply" section isn't necessary
+
+ The output should be printed to the screen, and also sent to the
+ gdb-radiusd.log file.
+
+ You should then submit the information from the log file, along with
+ any server output, the output of radiusd -xv, and information about your
+ operating system to:
+
+ http://bugs.freeradius.org/
+
+ Submitting it to the bug database ensures that the bug report won't
+ get forgotten, and that it will be dealt with in due course.
+
+ You should provide the issue number in any mail sent to the user's list.
+
+
+5. VALGRIND
+
+ On Linux systems, "valgrind" is a useful tool that can catch certain
+ classes of bugs. To use it, run the server voa:
+
+$ valgrind --tool=memcheck --leak-check=full radiusd -Xm
+
+ It will print out certain kinds of errors to the screen. There may
+ be a number of errors related to OpenSSL, dlopen(), or libtldl. We
+ cannot do anything about those problems. However, any errors that are
+ inside of the FreeRADIUS source should be brought to our attention.
+
+
+6. RUNNING WITH "SCREEN"
+
+ If the bug is a crash of the server, and it takes a long time for the
+ crash to happen, perform the following steps:
+
+ * log in as root
+ * open a screen session (https://www.gnu.org/software/screen/)
+ $ screen bash
+ * make sure FreeRADIUS is not running
+ * make sure you have all the debug symbols about, or a debugable
+ version of the server installed
+ * configure screen to log to a file; 'Ctrl-A H'
+ * type 'gdb /path/to/radius' (or /path/to/freeradius on Debian)
+ * at the (gdb) prompt, type 'run -X'
+ * detach from screen 'Ctrl-A D'
+ * when you notice FreeRADIUS has died, reconnect to your screen session
+ $ screen -D -r
+ * at the (gdb) prompt type 'where' or for *lots* of info try
+ 'thread apply all bt full'
+ * tell screen to stop logging, 'Ctrl-A H'
+ * logout from screen
+
+--
+
+FreeRADIUS Project, copyright 2014
+$Id$