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Re: kern/52110: pager assertion fails

The following reply was made to PR kern/52110; it has been noted by GNATS.

From: Martin Husemann <>
Subject: Re: kern/52110: pager assertion fails
Date: Sat, 29 Apr 2017 08:19:37 +0200

 It happened again, similar results...
 panic: kernel diagnostic assertion "uvmexp.swpgonly + npages <= uvmexp.swpginuse
 " failed: file "../../../../uvm/uvm_pager.c", line 472
 db> bt
 0xf60a6ea4: netbsd:vpanic+0xc
 0xf60a6ebc: netbsd:kern_assert+0x40
 0xf60a6f2c: netbsd:uvm_aio_aiodone_pages+0x510
 0xf60a6f7c: netbsd:uvm_aio_aiodone+0x94
 0xf60a6fac: netbsd:workqueue_worker+0xb8
 db> show uvm 
 Current UVM status:
   pagesize=4096 (0x1000), pagemask=0xfff, pageshift=12, ncolors=1
   22897 VM pages: 11260 active, 5740 inactive, 1851 wired, 640 free
   pages  13894 anon, 3813 file, 1144 exec
   freemin=114, free-target=152, wired-max=7632
   resv-pg=1, resv-kernel=5, zeropages=0
     faults=8568655, traps=223332422, intrs=2281677, ctxswitch=1067164
     softint=751516, syscalls=55249527
   fault counts:
     noram=0, noanon=0, pgwait=0, pgrele=0
     ok relocks(total)=1482(1510), anget(retrys)=1198025(0), amapcopy=603423
     neighbor anon/obj pg=987024/8890323, gets(lock/unlock)=1940229/1510
     cases: anon=782926, anoncow=410750, obj=1732691, prcopy=207509, przero=61172
   daemon and swap counts:
     woke=133, revs=133, scans=99286, obscans=62998, anscans=634
     busy=48, freed=63632, reactivate=3101, deactivate=139049
     pageouts=45, pending=621, nswget=0
     nswapdev=1, swpgavail=524411
     swpages=524411, swpginuse=647, swpgonly=645, paging=0

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