NetBSD-4 from 17-Jan-2007 tree on a PowerMac 9600 with a 500 MHz PowerPC 
750GX... what else? It was just sitting around, running nothing terribly 
specific...



trap: pid 0.0 (): kernel MCHK trap @ 0x282e00 (SRR1=0x49030)
panic: trap
Begin traceback...
0x004abd90: at trap+0x124
0x004abe10: kernel MCHK trap by rnd_sample_free+0x48: srr1=0x49030
             r1=0x4abed0 cr=0x20009082 xer=0x20000000 ctr=0
0x004abed0: at rnd_sample_free+0x40
0x004abef0: at rnd_timeout+0xf4
0x004abf20: at softclock+0x2c8
0x004abf50: at hardclock+0x130
0x004abf70: at decr_intr+0x108
0x004abfa0: at trapstart+0xbb8
0xd648cad0: at lcsplx+0xc
0xd648cae0: at Idle+0x24
0xd648caf0: at mi_switch+0x180
0xd648cb30: at ltsleep+0x2d4
0xd648cb70: at biowait+0x58
0xd648cb90: at ufs_blkatoff+0x204
0xd648cc50: at ufs_lookup+0x324
0xd648ccf0: at VOP_LOOKUP+0x34
0xd648cd10: at lookup+0x2f0
0xd648cd70: at namei+0x14c
0xd648ce10: at sys___stat30+0x50
0xd648cee0: at syscall_plain+0x1fc
0xd648cf40: user SC trap #387 by 0xefc807c0: srr1=0xf032
             r1=0xffffc130 cr=0x84000088 xer=0 ctr=0xefc87d58
End traceback...
syncing disks... 5 4 3 1 done
dumpsys: TBD
rebooting