I built a kernel without the random device and tried to use the
module.  I loaded it from the bootloader and the machine panic'ed on boot: 

Mounting root from ufs:/dev/da0a
da0 at sym0 bus 0 target 0 lun 0
da0: <SEAGATE ST39140W 1498> Fixed Direct Access SCSI-2 device 
da0: 40.000MB/s transfers (20.000MHz, offset 15, 16bit), Tagged Queueing Enabled
da0: 8683MB (17783240 512 byte sectors: 255H 63S/T 1106C)
Entropy harvesti
fatal kernel trap:

    trap entry = 0x2 (memory management fault)
    a0         = 0xe8c77a27c5265710
    a1         = 0x1
    a2         = 0x0
    pc         = 0xfffffc000042f824
    ra         = 0xfffffc000042f830
    curproc    = 0xfffffe00058c24e0
        pid = 34, comm = sysctl

Stopped at      name2oid+0x104: ldq     a1,0x28(s1) <0xe8c77a27c5265710>        

name2oid() at name2oid+0x104
sysctl_sysctl_name2oid() at sysctl_sysctl_name2oid+0xd0
sysctl_root() at sysctl_root+0x16c
userland_sysctl() at userland_sysctl+0x1c0
__sysctl() at __sysctl+0xa4
syscall() at syscall+0x638
XentSys1() at XentSys1+0x10
db> reboot

Gdb says:

(gdb) l* 0xfffffc000042f824
0xfffffc000042f824 is in name2oid (../../kern/kern_sysctl.c:621).
616                     *p = '\0';
618             oidp = SLIST_FIRST(lsp);
620             while (oidp && *len < CTL_MAXNAME) {
621                     if (strcmp(name, oidp->oid_name)) {
622                             oidp = SLIST_NEXT(oidp, oid_link);
623                             continue;
624                     }
625                     *oid++ = oidp->oid_number;

When I boot into single user mode and try to load the module after boot, this happens:
Enter full pathname of shell or RETURN for /bin/sh: 
# kldload random
panic: cpu_fork: curproc

syncing disks... 
Uptime: 27s

Andrew Gallatin, Sr Systems Programmer  http://www.cs.duke.edu/~gallatin
Duke University                         Email: [EMAIL PROTECTED]
Department of Computer Science          Phone: (919) 660-6590

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