On Wed, 13 Sep 2006 23:01:33 -0700, Martin Shepherd wrote: > > > On Thu, 14 Sep 2006, D. Michael McIntyre wrote: >> On Wednesday 13 September 2006 10:50 pm, Shelagh Manton wrote: >> >>> Yes indeedy! Unless I'm too impatient? How long should I have waited: I >>> waited about 5 minutes. >> >> No, that's more than adequate.
Just to let you know that I will try your valuable suggestions: but tomorrow. I'm reaching the time of day when tea looms on the horizon, and that my responsibility. Shelagh > Indeed. A couple of suggestions to try: > > 1. Have you seen whether it is possible to switch to a different > virtual console when it locks up? > > To try this, press Alt-Ctrl-F2, and see if you get presented with a > login prompt. If you are, then this means that the X-server has > hung, not the kernel. This usually means that a process has > performed an exclusive grab on the X server and then failed to > release it. > > If this reveals a login prompt, then you should be able to recover > your system, by first killing rosegarden and rosegarden-sequencer, > by typing: > > pkill rosegarden > > or > > pkill -KILL rosegarden > > if the former doesn't work, and/or by killing the X server, and then > by typing Alt-Ctrl-F7 to return to the graphical console. If this > turns out to work, then other useful things to do would be to > reproduce the problem, and then from the other virtual console, > attach to first rosegarden and then rosegarden-sequencer with the > debugger, to see which functions they are executing, and then with > strace, to see what system calls they are making. > > For example, first type: > > pgrep rosegarden > > to see what the process IDs are of rosegarden and > rosegarden-sequencer. If, for example, this revealed that the > process ID of rosegarden was 1234, then to attach the debugger to > the running rosegarden process, you would type: > > gdb rosegarden 1234 > > Once gdb is running, type: > > where > > and this should list the stack of functions that are being called > (unless debugging symbols have all been stripped). > > Similarly, to see what system calls rosegarden is making, you could > type: > > strace -p 1234 > > If rosegarden really is stuck in a system call, then this won't > display anything. If rosegarden is in a loop, however, then there > should be a steady stream of messages, which might be instructive. > > Do the same with rosegarden-sequencer. > > 2. Alternatively, if the kernel really is hanging and you thus can't > get a virtual console, then see if you can start rosegarden from a > terminal that will remain visible when rosegarden appears, and start > rosegarden from it, using strace, so that you can see the final > system calls that rosegarden makes before everything locks up. You > can do this by typing: > > strace -f rosegarden > > If it proves to be impossible to have the terminal window unobscured > by rosegarden, when the system locks up, then try sending the output > of strace to a file, so that you can look at this after you reboot. > This may or may not work, depending on whether the kernel manages to > write the output of strace to the file, before it locks up. But it's > worth a try. You would do this by typing: > > strace -f -o /tmp/rosegarden.trace rosegarden > > Martin > > ------------------------------------------------------------------------- > Using Tomcat but need to do more? Need to support web services, > security? Get stuff done quickly with pre-integrated technology to make > your job easier Download IBM WebSphere Application Server v.1.0.1 based > on Apache Geronimo > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Rosegarden-devel mailing list [email protected] - use the link below to unsubscribe https://lists.sourceforge.net/lists/listinfo/rosegarden-devel
