unable to install beta6 [amd64] on Dell 2850 with 4 GB RAM,workaround

[Claus Guttesen]

> You need to increase VM_KMEM_SIZE_MAX in your kernel
> config, e.g.
> options VM_KMEM_SIZE_MAX=536870912

Did that, but it panicked, hand-transcribed screen:

vm_fault on nofault entry, addr : ffffffffb091d000
KDB stack backtrace
panic() at 0xffffffff8020bf17 = panic+0x2a7
vm_fault() at 0xffffffff802f57b0 = vm_fault+0x1ce0
trap_pfault() at 0xffffffff80330350 =
trap_pfault+0x2a0
alltraps_with_regs_pushed() at 0xffffffff8031c3fb =
alltraps_with_regs_pushed+0x5
amr_mapcmd() at 0xffffffff80184f34 = amr_mapcmd+0x114
amr_start() at 0xffffffff801850e0 = amr_start+0x170
amr_startio() at 0xffffffff801857ce = amr_startio+0x3e
amr_submit_bio() at 0xffffffff80185bb0 =
amr_submit_bio+0x20
g_disk_start() at 0xffffffff801ed02a =
g_disk_start+0xea
g_io_schedule_down() at 0xffffffff801cf4ca =
g_io_schedule_down+0xea
g_down_procbody() at 0xffffffff801cfa28 =
g_down_procbody+0x28
fork_exit() at 0xffffffff801f17af = fork_exit+0x8f
fork_trampoline() at 0xffffffff8031c5fe =
fork_trampoline+0xe
--- trap 0, rip = 0, rsp = 0xffffffffba13cd00, rbp = 0

Claus