The signal handler was executed in last run. This one makes more sense, since the trace is correctly printed.

bash-3.00# dbx sample
For information about new features see `help changes'
To remove this message, put `dbxenv suppress_startup_message 7.5' in your .dbxrc
Reading sample
Reading ld.so.1
Reading libsocket.so.1
Reading libnsl.so.1
Reading libm.so.2
Reading librt.so.1
Reading libpthread.so.1
Reading libc.so.1
Reading libaio.so.1
Reading libmd5.so.1
(dbx) stop in initsig
dbx: warning: 'initsig' has no debugger info -- will trigger on first instruction
(2) stop in initsig
(dbx) run
Running: sample
(process id 19149)
t@1 (l@1) stopped in initsig at 0x08aae794
0x08aae794: initsig       :     pushl    %ebp
(dbx) (dbx)
(dbx) cont
^Cdbx: warning: Interrupt ignored but forwarded to child.
t@1 (l@1) signal INT (Interrupt) in F38_793 at 0x896973a
0x0896973a: F38_793+0x022a:     movl     0xfffffff4(%ebp),%eax
(dbx) cont -sig INT

sample: system execution failed.
Following is the set of recorded exceptions:

******************************** Thread exception *****************************
In thread           Root thread            0x0 (thread id)
*******************************************************************************
-------------------------------------------------------------------------------
Class / Object      Routine                Nature of exception           Effect
-------------------------------------------------------------------------------
APPLICATION         make @1                Interrupt:
<0000000008C57248>                         Operating system signal.      Fail
-------------------------------------------------------------------------------
APPLICATION         make @1
<0000000008C57248>                         Routine failure.              Fail
-------------------------------------------------------------------------------
APPLICATION         root's creation
<0000000008C57248>                         Routine failure.              Exit
-------------------------------------------------------------------------------

execution completed, exit code is 1
(dbx)