>From the -current sources, about a day or so old (I'm trying to get
new ones to try again)....


H/W: SS2, 16MB, 2 disks, sync mode turned *on* (an attempt to see what
state it was in....) going to one disk and doing make on the /usr/src
tree....

panic: pmap_page_protect !PG_V
syncing disks... 2 2 done
Frame pointer is at 0xf9c2bc08
Call traceback:
  pc = f80fa4f0  args = (0, 11900fe1, f8126400, f9c2bd28, 11000081, f9c5bfb0, f9c2bc70) fp = 0xf9c2bc70
  pc = f802a98c  args = (100, 0, 1, f12a2, 32a, 100b0060, f9c2bcd8) fp = 0xf9c2bcd8
  pc = f80fe124  args = (100, f813a000, f8002000, 0, 0, 30000000, f9c2bd40) fp = 0xf9c2bd40
  pc = f80d9770  args = (f812983c, 20, f813a000, f814ea40, 0, 0, f9c2bdb0) fp = 0xf9c2bdb0
  pc = f80d96b4  args = (f817b958, f860c400, 3f, f814d510, 0, 0, f9c2be18) fp = 0xf9c2be18
  pc = f80d9aec  args = (55, 3f, 447, 2, ffffffff, 3, f9c2be80) fp = 0xf9c2be80
  pc = f801a848  args = (f801a813, f85bcede, ffffffff, f8130320, 0, 0, f9c2bee8) fp = 0xf9c2bee8
  pc = f8007800  args = (f85bce00, 0, f8041700, f85b7600, 1, f9c29ba4, f9c2bf50) fp = 0xf9c2bf50
  pc = 0  args = (0, 0, 0, 0, 0, 0, 0) fp = 0x0

dumping to dev 701, offset 17572
dump succeeded

which is:

#0  0xf80fa744 in dumpsys ()
#1  0xf80fa4f8 in cpu_reboot ()
#2  0xf802a994 in panic ()
#3  0xf80fe12c in pmap_page_protect4_4c ()
#4  0xf80d9778 in vm_pageout_page ()
#5  0xf80d96bc in vm_pageout_scan ()
#6  0xf80d9af4 in vm_pageout ()
#7  0xf801a850 in start_pagedaemon ()

core files are in ftp://remler.nas.nasa.gov/~ftp/pub/netbsd/coredumps/sparc/05.23.97/netbsd.0.{core}

I'll rebuild with the latest and greatest and try to reproduce...

btw- the sync mode and disco/reco stuff seems to work , althought I got:

scsibus0 at esp0: 8 targets
probe(esp0:1:0): max sync rate 4.03Mb/s
sd0 at scsibus0 targ 1 lun 0: <MAXTOR, LXT-213S SUN0207, 4.20> SCSI1 0/direct fixed
sd0: 202MB, 1310 cyl, 7 head, 45 sec, 512 bytes/sec
probe(esp0:2:0): max sync rate 4.03Mb/s
sd1 at scsibus0 targ 2 lun 0: <MICROP, 1598-15MD1066701, DD24> SCSI1 0/direct fixed
sd1: 994MB, 1928 cyl, 15 head, 70 sec, 512 bytes/sec
esp0: !TC [intr 10, stat 87, step 1] prevphase 6, resid 0
esp0: illegal command: 0x90 (state 4, phase 6, prevphase 6)
esp0: illegal command: 0x90 (state 4, phase 6, prevphase 6)