writes: > Hi All, > > I have a bunch of C++ application which runs as daemons in Linux. > > Another reason for it to crash might be corrupted input data that it > processes. > > I used --leak-check=yes and --log-file=foo.txt options with Valgrind. > > However, Valgrind did not report any invalid write/read or > uninitialized variable errors which may have caused the crash.
It might be that your daemon is a `true' daemon, in that it does the double fork trick. In that case, you want to make sure you use the command line option "--trace-children=yes". Less like is that you might be hitting the issue that Valgrind cannot detect all possible errors. See: http://www.valgrind.org/docs/manual/mc-manual.html#mc-manual.machine I believe there is a semi-recent paper from a group out of UMass Amherst which also goes into detail about the types of errors dynamic analysis tools can find, and valgrind is one of the tools they evaluate. > FAQ on Valgrind's official website says that this is the nature of > Valgrind that you can not change such that it can not replicate the > native execution environment. I do not think this is an issue with the change in execution environment. That's normally more of an issue with e.g. timed sections of code or threading. > What is the best debugger options to use with Valgrind to debug a > Linux daemon ? Other than the potential lack of --trace-children, your options seem fine. > Should I attach Valgrind to already running process ? or Is it ok to > start the daemon with Valgrind in shell script ? It is not possible to attach valgrind to a process after execution has started, due to the nature of how it works. It'll be obvious when you read the above link: what would the `V' bits get set to when you attach, for example? -tom ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ Valgrind-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/valgrind-users
