Hi, I noticed that the "-g" option to "bt" seems to have no effect in recent crash versions. And indeed, 5.1.8-to-5.1.9.patch contains the following chunk: --- crash-5.1.8/kernel.c 2011-10-17 14:06:31.000000000 -0400 +++ crash-5.1.9/kernel.c 2011-09-28 15:31:00.000000000 -0400 @@ -1876,10 +1896,10 @@ cmd_bt(void) break; case 'g': -#if defined(GDB_6_0) || defined(GDB_6_1) || defined(GDB_7_0) - bt->flags |= BT_THREAD_GROUP; -#else +#ifdef GDB_5_3 bt->flags |= BT_USE_GDB; +else + bt->flags |= BT_THREAD_GROUP; #endif break; Note that the hash sign is missing, so the pre-processor only leaves the "break" statement... The following patch seems to help. Signed-off-by: Petr Tesarik <ptesarik(a)suse.cz&gt; --- a/kernel.c +++ b/kernel.c @@ -1922,7 +1922,7 @@ cmd_bt(void) case 'g': #ifdef GDB_5_3 bt->flags |= BT_USE_GDB; -else +#else bt->flags |= BT_THREAD_GROUP; #endif break;