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kern/52110: pager assertion fails

>Number:         52110
>Category:       kern
>Synopsis:       pager assertion fails
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Mar 25 13:45:00 +0000 2017
>Originator:     Martin Husemann
>Release:        NetBSD 7.99.66
The NetBSD Foundation, Inc.
System: NetBSD 7.99.66 NetBSD 7.99.66 (GENERIC) #57: Fri Mar 24 19:46:27 CET 2017 shark
Architecture: earmv4
Machine: shark

This happend while trying to run the weekly atf tests on a 96MB ram shark:

panic: kernel diagnostic assertion "uvmexp.swpgonly + npages <= uvmexp.swpginuse" failed: file "../../../../uvm/uvm_pager.c", line 472 
Stopped in pid 0.39 (system) at netbsd:cpu_Debugger+0x4:        mov     pc, r14
db> bt
0xf60a6e9c: netbsd:vpanic+0xc
0xf60a6eb4: netbsd:kern_assert+0x40
0xf60a6f24: netbsd:uvm_aio_aiodone_pages+0x510
0xf60a6f7c: netbsd:uvm_aio_aiodone+0x94
0xf60a6fac: netbsd:workqueue_worker+0xb8

db> ps
PID    LID S CPU     FLAGS       STRUCT LWP *               NAME WAIT
11566    1 2   0         0           f19fd600          t_exhaust

db> show uvm
Current UVM status:
  pagesize=4096 (0x1000), pagemask=0xfff, pageshift=12, ncolors=1
  22899 VM pages: 11245 active, 5733 inactive, 1853 wired, 656 free
  pages  13938 anon, 3665 file, 1228 exec
  freemin=114, free-target=152, wired-max=7633
  resv-pg=1, resv-kernel=5, zeropages=0
    faults=8595173, traps=217318837, intrs=2462884, ctxswitch=1247775
    softint=835513, syscalls=54565076
  fault counts:
    noram=0, noanon=0, pgwait=0, pgrele=0
    ok relocks(total)=1538(1566), anget(retrys)=1220698(0), amapcopy=633310
    neighbor anon/obj pg=985466/8903283, gets(lock/unlock)=1944017/1566
    cases: anon=799827, anoncow=416502, obj=1735942, prcopy=208046, przero=61258
  daemon and swap counts:
    woke=134, revs=134, scans=110945, obscans=62147, anscans=1374
    busy=55, freed=63521, reactivate=3699, deactivate=145607
    pageouts=92, pending=1315, nswget=0
    nswapdev=1, swpgavail=524411
    swpages=524411, swpginuse=1403, swpgonly=1397, paging=0



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