Useful for tracking down segfaults in the daemon. This is not upstreamable right now. Example usage: $ ./run guestfish -v -x -a /dev/null run : debug segv "" [...] libguestfs: trace: launch = 0 libguestfs: trace: debug "segv" "" guestfsd: main_loop: new request, len 0x34 Program received signal SIGSEGV, Segmentation fault. debug_segv (subcmd=0x4687050 "segv", argc=0, argv=0x4687070) at debug.c:223 223\tdebug.c: No such file or directory. #0 debug_segv (subcmd=0x4687050 "segv", argc=0, argv=0x4687070) at debug.c:223 #1 0x000000000042e083 in debug_stub (xdr_in=<optimized out>) at stubs.c:2557 #2 0x0000000000448d5d in dispatch_incoming_message (xdr_in=0x7fffffffe8d0) at stubs.c:15819 #3 0x0000000000428a91 in main_loop (_sock=73953360, _sock@entry=3) at proto.c:192 #4 0x000000000040564d in main (argc=<optimized out>, argv=<optimized out>) at guestfsd.c:344 Rebooting. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://people.redhat.com/~rjones/virt-top