This may well turn out to be a glibc bug, but portmap is where the symptoms
appear: when I start portmap (either through the service script or directly with
/sbin/portmap) it immediately segfaults.

Running '/sbin/portmap -d' under gdb gives the backtrace
#0  svc_run () at svc_run.c:81
#1  0x00640bb7 in main (argc=Cannot access memory at address 0x0) at portmap.c:245

The line svc_run.c:81 is 'my_pollfd[i].revents = 0;'

The output of 'strace -f /sbin/portmap' is attached.

This is on a machine running

glibc-2.5.90-8
kernel-2.6.18-1.2849.fc6
portmap-4.0-65.2.2.1