Hi, It seems that KDB_REASON_CALL doesn't give a stack backtrace anymore. I noticed kdb_local() used to build a register context with functions like kdb_getcurrentframe() and kdba_setpc(). Now the code just says "kdb() called with no registers, restricted function". Any particular reason? Do I have the wrong patch? I have applied the following patches to the linux-2.4.20 tree: kdb-v2.5-2.4.20-common-1 kdb-v2.5-2.4.20-i386-1 BTW. Great work on the debugger. Thanks, Rob -- Rob Tarte Pacific CodeWorks 1347 Pacific Ave., Suite 202 Santa Cruz, CA 95060 (p) 831-426-7582 (f) 831-426-7584