Inactive pmap?

[Nathaniel W Filardo]

I've been getting a few of these over the past while.  I don't believe
there's a hardware problem.  The hardware is a stock V240 uniprocessor
machine.

FreeBSD hydra.priv.oc.ietfng.org 8.1-STABLE FreeBSD 8.1-STABLE #18
r211472+d3b8a13: Fri Aug 20 00:54:00 EDT 2010
root at hydra.priv.oc.ietfng.org:/systank/obj/systank/src/sys/NWFKERN  sparc64

panic() at panic+0x1c8
tlb_page_demap() at tlb_page_demap+0x148
pmap_cache_enter() at pmap_cache_enter+0x1dc
pmap_kenter() at pmap_kenter+0x1b4
pmap_qenter() at pmap_qenter+0x78
sf_buf_alloc() at sf_buf_alloc+0x160
zfs_freebsd_read() at zfs_freebsd_read+0x2cc
VOP_READ_APV() at VOP_READ_APV+0x108
VOP_READ_AP() at VOP_READ_AP+0xc
null_bypass() at null_bypass+0x124
VOP_READ_APV() at VOP_READ_APV+0x11c
vn_read() at vn_read+0x240
dofileread() at dofileread+0x74
kern_preadv() at kern_preadv+0x68
pread() at pread+0x50
syscall() at syscall+0x25c
-- syscall (475, FreeBSD ELF64, pread) %o7=0x4022d784 --
userland() at 0x4022fa48
user trace: trap %o7=0x4022d784
pc 0x4022fa48, sp 0x7fdffffd891
pc 0x4022b474, sp 0x7fdffffd9a1
pc 0x4022b6b0, sp 0x7fdffffdcb1
pc 0x4022c84c, sp 0x7fdffffdd71
pc 0x40226e74, sp 0x7fdffffe4d1
done
Uptime: 5d3h53m14s

and

FreeBSD hydra.priv.oc.ietfng.org 8.1-STABLE FreeBSD 8.1-STABLE #17
r210985+7fd3af5: Sat Aug  7 14:25:03 EDT 2010
root at hydra.priv.oc.ietfng.org:/systank/obj/systank/src/sys/NWFKERN  sparc64

panic: tlb_page_demap: inactive pmap?
cpuid = 0
KDB: stack backtrace:
panic() at panic+0x1c8
tlb_page_demap() at tlb_page_demap+0x148
pmap_cache_remove() at pmap_cache_remove+0x1a0
pmap_kremove() at pmap_kremove+0x120
pmap_qremove() at pmap_qremove+0x74
sf_buf_free() at sf_buf_free+0x8
zfs_freebsd_read() at zfs_freebsd_read+0x2f4
VOP_READ_APV() at VOP_READ_APV+0x108
VOP_READ_AP() at VOP_READ_AP+0xc
null_bypass() at null_bypass+0x124
VOP_READ_APV() at VOP_READ_APV+0x11c
vn_read() at vn_read+0x240
dofileread() at dofileread+0x74
kern_preadv() at kern_preadv+0x68
pread() at pread+0x50
syscall() at syscall+0x25c
-- syscall (475, FreeBSD ELF64, pread) %o7=0x4020f784 --
userland() at 0x40211a48
user trace: trap %o7=0x4020f784
pc 0x40211a48, sp 0x7fdffffd891
pc 0x4020d474, sp 0x7fdffffd9a1
pc 0x4020d6b0, sp 0x7fdffffdcb1
pc 0x4020e84c, sp 0x7fdffffdd71
pc 0x40208e74, sp 0x7fdffffe4d1
done
Uptime: 8d4h57m37s

Suggestions?
Thanks much.
--nwf;
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