Information how to write good bug reports

git-svn-id: http://svn.irssi.org/repos/irssi/trunk@1524 dbcabf3a-b0e7-0310-adc4-f8d773084564

docs/crash.txt

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+How to submit a good bug report?
+
+First you should give the following information:
+ - irssi version, if CVS (or devel. tarball) then which day?
+ - operating system / distribution and it's version
+ - when did it crash? did you do something? can you reproduce the crash?
+
+Getting backtrace of the crash also helps a lot, especially if irssi crashes
+randomly. If after crash you see text:
+
+ "segmentation fault (core dumped)"
+
+It writes a file named "core" to directory where you started irssi. If it
+doesn't print the "(core dumped)" or you can't find the core file, you'll
+have to raise the limit for max. core file size before running irssi. To
+do this, say:
+
+ ulimit -c unlimited
+
+So, if you have the core file and GNU debugger (gdb), you can get the
+backtrace with:
+
+ gdb irssi core
+ bt
+
+Paste all the lines starting from line having #0 at the beginning.
+
+Here's an example session:
+
+[cras@hurina] ~/cvs/m/irssi/src/fe-text$ gdb ./irssi core
+
+GNU gdb 5.0
+Copyright 2000 Free Software Foundation, Inc.
+GDB is free software, covered by the GNU General Public License, and you are
+welcome to change it and/or distribute copies of it under certain conditions.
+Type "show copying" to see the conditions.
+There is absolutely no warranty for GDB.  Type "show warranty" for details.
+This GDB was configured as "i686-pc-linux-gnu"...
+
+Core was generated by ./irssi'.
+Program terminated with signal 11, Segmentation fault.
+#0  0x805e949 in view_scroll (view=0x816cfb5, lines=0x816cfd9, 
+    subline=0x816cfdd, scrollcount=-11, draw_nonclean=1)
+    at textbuffer-view.c:528
+528                             realcount += view->bottom_subline;
+
+(gdb) bt
+
+#0  0x805e949 in view_scroll (view=0x816cfb5, lines=0x816cfd9, 
+    subline=0x816cfdd, scrollcount=-11, draw_nonclean=1)
+    at textbuffer-view.c:528
+#1  0x805ecb4 in textbuffer_view_scroll (view=0x816cfb5, lines=-11)
+    at textbuffer-view.c:669
+#2  0x8058387 in gui_window_scroll (window=0x816cead, lines=-11)
+    at gui-windows.c:128
+#3  0x8056b64 in window_prev_page () at gui-readline.c:109
+#4  0x8057047 in key_scroll_backward () at gui-readline.c:334
+...
+(gdb)