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trap in pmap_remove_ptes()

I just got this panic on a NetBSD 3.1_STABLE system (I think I've seen it
fatal page fault in supervisor mode
trap type 6 code 0 eip c030cb22 cs 8 eflags 10206 cr2 38 ilevel 0
panic: trap
Begin traceback...
trap() at netbsd:trap+0x137
--- trap (number 6) ---
pmap_remove_ptes(cc0e9a18,c106eb80,ffc20000,8000000,8400000) at netbsd:pmap_re
pmap_do_remove(cc0e9a18,0,bfeff000,1,9) at netbsd:pmap_do_remove+0x15b
pmap_collect(cc0e9a18,cd891000,ccf2bf3c,c02f27f3,5c) at netbsd:pmap_collect+0x17
uvm_swapout_threads(0,0,c0433620,6,12504) at netbsd:uvm_swapout_threads+0xbb
uvmpd_scan(0,0,aaacf490,124f2,0) at netbsd:uvmpd_scan+0x1c9
uvm_pageout(cc0f331c,51b000,523000,0,c0100321) at netbsd:uvm_pageout+0xdb
End traceback...
syncing disks... [BREAK]Stopped in pid 102.1 (pagedaemon) at    netbsd:cpu_Deb

db> sh uvm
Current UVM status:
  pagesize=4096 (0x1000), pagemask=0xfff, pageshift=12
  256814 VM pages: 150002 active, 75012 inactive, 1111 wired, 0 free
  min  10% (25) anon, 10% (25) file, 5% (12) exec
  max  80% (204) anon, 50% (128) file, 30% (76) exec
  pages  26660 anon, 215979 file, 2491 exec
  freemin=64, free-target=85, inactive-target=74994, wired-max=85604
  faults=1384262176, traps=1697888555, intrs=880522887, ctxswitch=491374407
  softint=1337339371, syscalls=812050363, swapins=128392, swapouts=128427
  fault counts:
    noram=0, noanon=0, pgwait=0, pgrele=0
    ok relocks(total)=195781(195782), anget(retrys)=1480561665(0), 
    neighbor anon/obj pg=74773521/295147509, gets(lock/unlock)=78822860/195782
    cases: anon=1183226928, anoncow=25055941, obj=68387774, prcopy=10435085, 
  daemon and swap counts:
    woke=271969, revs=271882, scans=106862516, obscans=75690186, anscans=0
    busy=880, freed=75690186, reactivate=28505102, deactivate=122564813
    pageouts=0, pending=0, nswget=0
    nswapdev=1, nanon=373798, nanonneeded=373798 nfreeanon=366597
    swpages=133103, swpginuse=0, swpgonly=0 paging=0

Does it ring a bell to someone ?

Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference

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