HowToReportABug » History » Revision 1
= How to report a bug =
If you find a bug in lighttpd you can help alot to find a fix for it by following some simple steps:
- [http://en.wikipedia.org/wiki/Don't_panic Don't Panic] * if it is a crash generate a Backtrace * if it behaves in a unexpected way prepare a strace
A backtrace is a trace of the function which have been called before lighttpd died.
The best way to generate such a backtrace is using [http://valgrind.kde.org/ valgrind]:
$ valgrind --tool=memcheck -v --logfile=lighttpd --num-callers=8 lighttpd -D -f ./lighttpd.conf
valgrind does many useful things while it waits for the server to crash:
- checks for uninitialized variables * checks for out-of-bounds access * and many more
If you can't use valgrind there is another way to generate a backtrace:
$ gdb lighttpd
(gdb) r -D -f lighttpd.conf
strace is the name of the syscall-tracer on Linux. Every Unix-like OS provides a utility to collect information about system call like open, write, close and so on.
The have different names like
- strace * truss * ktrace (then kdump to get output)
If strace is available it is prefered as it provides the most useful information. Execute it like:
$ strace -olighttpd.trace -tt -s 4000 lighttpd -D -f ./lighttpd.conf
It will generate a file called lighttpd.trace.Writing a bug report
If you have generated a backtrace or a syscall-trace please make sure that you can reproduce the problem. Otherwise it will be really hard for the developers to fix the problem for you.
If possible open a [http://trac.lighttpd.net/trac/newticket new ticket]
If the report contains sensitive data you might also send it directly to: mailto:email@example.com