[Thread debugging using libthread_db enabled]
[New Thread -1214974288 (LWP 16430)]
Unknown format dispatch character,  

Program received signal SIGABRT, Aborted.
[Switching to Thread -1214974288 (LWP 16430)]
0xffffe410 in __kernel_vsyscall ()
(gdb) when
Undefined command: "when".  Try "help".
(gdb) where
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7986875 in raise () from /lib/tls/i686/cmov/libc.so.6
#2  0xb7988201 in abort () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7cc410f in dylanZdylan_visceraZinvoke_debugger_METH ()
   from /usr/local/lib/dylan/2.4.0/x86-linux-gcc/libdylan-dylan.so.0
#4  0x080d1008 in ?? ()
#5  0xb7cdbfa0 in ?? () from /usr/local/lib/dylan/2.4.0/x86-linux-gcc/libdylan-dylan.so.0
#6  0x00000001 in ?? ()
#7  0x0809fb30 in standard_ioZstandard_ioZVstandard_outputV ()
#8  0xb7d09dc0 in ?? () from /usr/local/lib/dylan/2.4.0/x86-linux-gcc/libdylan-dylan.so.0
#9  0x00000000 in ?? ()