panic: Too many early devmap mappings

[tech-lists]

On Tue, Jan 12, 2021 at 10:53:00PM -0800, Mark Millard via freebsd-arm wrote:

>I forgot to list the bugzilla for this:
>
>https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252541
>
>I have added the notes, including:
>
>QUOTE
>Turns out that this "too much high kernel memory in use" issue happens for
>a combination of 2 things being true at the same time:
>
>A) Monitor attached (sufficiently large pixel count?)
>B) GDB enabled, per bbfa199cbc16 .
>END QUOTE

Hi,

About a week ago, made new world on this rpi4b, installed it, rebooted
and it didn't come back. It normally runs headless, keyboardless.
If these are plugged in, the pi rebooted, it all comes back.

Same/similar problem? Context is main-c255784-ge83fdf8bb39. Its kernel
config file:

nooptions       INVARIANTS
nooptions       INVARIANT_SUPPORT
nooptions       WITNESS
nooptions       WITNESS_SKIPSPIN
nooptions       DEADLKRES
nooptions       USB_DEBUG
nooptions       COVERAGE
nooptions       KCOV
nooptions       MALLOC_DEBUG_MAXZONES
options         FUSEFS
device          wlan              # 802.11 support
device          wlan_wep          # 802.11 WEP support
device          wlan_ccmp         # 802.11 CCMP support
device          wlan_tkip         # 802.11 TKIP support
device          wlan_amrr         # AMRR transmit rate control algorithm
device          run               # rpi supplied external usb2 wifi
device          runfw             # firmware

thanks,
-- 
J.
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