I get a panic from a recent system.  It seems to be memory usage
related and from the following I am wondering if I don't have enough
swap.

(gdb) target kcore netbsd.0.core
panic: pagedaemon: clean anon page without backing store?
#0  0xf021568a in uvm_pageout () at ../../../../uvm/uvm_pdaemon.c:309
309     }
(gdb) bt
#0  0xf021568a in uvm_pageout () at ../../../../uvm/uvm_pdaemon.c:309
#1  0xf021d017 in cpu_reboot (howto=256, bootstr=0x0)
    at ../../../../arch/i386/i386/machdep.c:1350
#2  0xf01793e8 in log (level=-266250614, fmt=0xf0477494 "\004\207>ð\230:Bð")
    at ../../../../kern/subr_prf.c:212
#3  0xf0215941 in uvmpd_scan_inactive (pglst=0xf02cb8f8)
    at ../../../../uvm/uvm_pdaemon.c:514
#4  0xf0215e17 in uvmpd_scan () at ../../../../uvm/uvm_pdaemon.c:998
#5  0xf02155eb in uvm_pageout () at ../../../../uvm/uvm_pdaemon.c:294
#6  0xf0168c84 in start_pagedaemon (arg=0x0)
    at ../../../../kern/init_main.c:581

Here's a swapctl -lk

Device      1K-blocks     Used    Avail Capacity  Priority
/dev/sd0b      262144        4   262140     0%    0
/dev/sd1b      262144        4   262140     0%    0
Total          524288        8   524280     0%

This is for a system with 250 users who mostly maintain mailboxes with
some shell access and a bunch of web pages.

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