9.2 + ZFS + i386 = panic: pmap_enter: attempted pmap_enter on 4MB page

[J David]

The "attempted pmap_enter on 4MB page" panic occurred again.  It says
the vmcore "isn't a dump file" for some reason but the core.txt file
contains this, which looks right and has source line numbers:

#0  doadump (textdump=1) at pcpu.h:249
249 pcpu.h: No such file or directory.
in pcpu.h
(kgdb) #0  doadump (textdump=1) at pcpu.h:249
#1  0x80ab0f98 in kern_reboot (howto=260)
    at /usr/src/sys/kern/kern_shutdown.c:449
#2  0x80ab1448 in panic (fmt=<value optimized out>)
    at /usr/src/sys/kern/kern_shutdown.c:637
#3  0x80f0b5bc in pmap_enter (pmap=0x81487c78, va=2296995840,
    m=<value optimized out>, prot=0 '\0')
    at /usr/src/sys/i386/i386/pmap.c:3532
#4  0x80d24f01 in vm_fault_hold (vaddr=808648704, fault_type=7 '\a',
    fault_flags=<value optimized out>, m_hold=<value optimized out>)
    at /usr/src/sys/vm/vm_fault.c:935
#5  0x80d23382 in vm_fault (map=0x81feb000, vaddr=<value optimized out>,
    fault_type=0 '\0', fault_flags=<value optimized out>)
    at /usr/src/sys/vm/vm_fault.c:229
#6  0x80f12aae in trap_pfault (frame=0x8774d9f4, usermode=0,
    eva=<value optimized out>) at /usr/src/sys/i386/i386/trap.c:934
#7  0x80f1213c in trap (frame=0x8774d9f4) at /usr/src/sys/i386/i386/trap.c:555
#8  0x80efb43c in calltrap () at /usr/src/sys/i386/i386/exception.s:170
#9  0x81759322 in avl_last (tree=0x88c5c4e0)
    at /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/common/avl/avl.c:194
#10 0x817bed4b in metaslab_df_alloc (sm=0x885c4b80, size=2560)
    at /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/metaslab.c:493
#11 0x817d8b83 in space_map_alloc (sm=<value optimized out>, size=2560)
    at /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/space_map.c:420
#12 0x817bd9d0 in metaslab_alloc (spa=0x30430000, mc=0x20,
    psize=3825868744137834496, bp=0x3769, txg=4344284791469325298,
    hintbp=0x7ae28e0, flags=<value optimized out>)
    at /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/metaslab.c:1478
#13 0x8180676f in zio_dva_allocate (zio=0x883ca8b8)
    at /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c:2338
#14 0x81803c46 in zio_execute (zio=0x883ca8b8)
    at /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c:1305
#15 0x81765380 in taskq_run_safe (arg=0x883cab70, pending=1)
    at /usr/src/sys/modules/zfs/../../cddl/compat/opensolaris/kern/opensolaris_taskq.c:150
#16 0x80af4ca1 in taskqueue_run_locked (queue=0x883b05c0)
    at /usr/src/sys/kern/subr_taskqueue.c:312
#17 0x80af54a9 in taskqueue_thread_loop (arg=0x882e7170)
    at /usr/src/sys/kern/subr_taskqueue.c:501
#18 0x80a7febc in fork_exit (callout=0x80af5420 <taskqueue_thread_loop>,
    arg=0x88e96c44, frame=0x10) at /usr/src/sys/kern/kern_fork.c:992
#19 0x80efb4e4 in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:279

Hopefully this is helpful.

Thanks!