Dustin J. Mitchell wrote at 09:46 -0500 on Jan  7, 2008:
 > On Jan 7, 2008 9:03 AM, Mister Olli <mister.olli AT googlemail DOT com> 
 > wrote:
 > > (gdb) bt
 > > #0  0x281ece17 in shmget () from /lib/libc.so.6
 > > #1  0x080520f4 in attach_buffers ()
 > > #2  0x0804b872 in main ()
 > 
 > Eek -- this is where the taper is allocating the memory that it will
 > share with the tape-writer process.  Have any FreeBSD folks seen this
 > error before?

SIGSYS (non-existent system call) might happen when you have a
mismatching userland and kernel.  Your first step is to make sure you
have updated your world (via the buildworld/buildkernel processed
documented in /usr/src/UPDATING).