PR 252541: Early kernel panic on RPi4B (Too many early devmatch mappings)

[Mark Millard]

On 2021-Jan-11, at 12:47, Gordon Bergling <gbe at freebsd.org> wrote:

> Hi,
> 
> I am currently investigating PR 252541 (Too many early devmatch mappings) [1].
> 
> The kernel panic happends on the RPi4B. Has anyone successfully booted a rivision
> on the RPi4B after:
> 
> ---------------------------------------------------------------------------------
> commit e83fdf8bb391579fa422d34663cd8c1f82a00dc0
> Author:     Chuck Tuffli <chuck at FreeBSD.org>
> AuthorDate: 2021-01-08 22:36:37 +0000
> Commit:     Chuck Tuffli <chuck at FreeBSD.org>
> CommitDate: 2021-01-08 22:41:45 +0000
> 
>   fix big-endian platforms after 6733401935f8
> 
>   The NVMe byte-swap routines for big-endian platforms used memcpy() to
>   move the unaligned 64-bit value into a temp register to byte swap it.
>   Instead of introducing a dependency, manually byte-swap the values in
>   place.
> ---------------------------------------------------------------------------------
> 
> --Gordon
> 
> [1] https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252541

I do my own builds but I'm running based on 19cca0b9613d
with CommitDate 2021-01-09 16:21:33 -0800 :

# ~/fbsd-based-on-what-freebsd-main.sh mm-src
19cca0b9613d7c3058e41baf0204245119732235
CommitDate: 2021-01-09 16:21:33 -0800
5d333ee67ac3 19cca0b9613d (HEAD -> mm-src) mm-src snapshot for mm's patched build in git context.
FreeBSD RPi4B 13.0-CURRENT FreeBSD 13.0-CURRENT mm-src-c255807-g5d333ee67ac3 GENERIC-NODBG  arm64 aarch64 1300134 1300134

In other words, the history spanned for e83fdf8bb391 and
after is:

* 	aio: fix the tests when ZFS is not available	Alan Somers	46 hours	2	-0/+5
* 	linuxkpi: Fix the "error: unknown type name 'u32'" compilation issue when	Neel Chauhan	47 hours	1	-0/+1
* 	netmap: vtnet: stop krings during interface reset	Vincenzo Maffione	48 hours	1	-1/+7
* 	netmap: refactor netmap_reset	Vincenzo Maffione	2 days	1	-45/+20
* 	netmap: iflib: fix asserts in netmap_fl_refill()	Vincenzo Maffione	2 days	1	-1/+2
* 	netmap: iflib: stop krings during interface reset	Vincenzo Maffione	2 days	2	-1/+10
* 	fileargs: add tests	Mariusz Zaborski	2 days	3	-0/+625
* 	tcp: don't use KTLS socket option on listening sockets	Michael Tuexen	4 days	1	-0/+10
* 	arm: revert MAXDSIZ change from 202aea9c82ea	Kyle Evans	2 days	1	-1/+1
* 	kevent(2): Bugfix for wrong EVFILT_TIMER timeouts	Jan Kokemüller	2 days	1	-1/+1
* 	ldd: renumber executable type constants	Ed Maste	2 days	1	-2/+2
* 	diff: honour flags with -q	Ed Maste	2 days	2	-1/+13
* 	sysctl: improve debug.kdb.panic_str description	Warner Losh	2 days	1	-1/+1
* 	last(1): Add EXAMPLES section	Fernando Apesteguía	2 days	1	-4/+22
* 	man(1): Bump .Dd	Fernando Apesteguía	2 days	1	-1/+1
* 	man(1): Add EXAMPLES section	Fernando Apesteguía	2 days	1	-0/+35
* 	mvneta: Acquire the softc lock before clearing the MIB	Mark Johnston	2 days	1	-0/+2
* 	Add fib lookup testing module.	Alexander V. Chernikov	2 days	2	-0/+548
* 	Bring DPDK route lookups to FreeBSD.	Alexander V. Chernikov	2 days	17	-0/+6030
* 	Fix LINT kernel build after 01f2e864f79584c0cd250a8e7cfb501a9985768a.	Hans Petter Selasky	3 days	1	-1/+4
* 	certctl: factor out certname resolution	Kyle Evans	3 days	1	-2/+17
* 	certctl: replace hardcoded uses of /usr/local	Kyle Evans	3 days	1	-2/+3
* 	fix big-endian platforms after 6733401935f8	Chuck Tuffli	3 days	1	-5/+9

The RPi4B is a 8 GiByte one, booted directly from a USB3 SSD,
no microsd card involved. I can boot either u-boot style or
UEFI/ACPI style from the same media, just switching config.txt
content.

I do not have MMCCAM or the like:

# more /usr/fbsd/mm-src/sys/arm64/conf/GENERIC-NODBG 
#
# GENERIC -- Custom configuration for the arm64/aarch64
#

include "GENERIC"

ident   GENERIC-NODBG

makeoptions     DEBUG=-g                # Build kernel with gdb(1) debug symbols

options         ALT_BREAK_TO_DEBUGGER

options         KDB                     # Enable kernel debugger support

# For minimum debugger support (stable branch) use:
#options        KDB_TRACE               # Print a stack trace for a panic
options         DDB                     # Enable the kernel debugger

# Extra stuff:
#options        VERBOSE_SYSINIT=0       # Enable verbose sysinit messages
#options        BOOTVERBOSE=1
#options        BOOTHOWTO=RB_VERBOSE
#options        KTR
#options        KTR_MASK=KTR_TRAP
##options       KTR_CPUMASK=0xF
#options        KTR_VERBOSE

# Disable any extra checking for. . .
nooptions       DEADLKRES               # Enable the deadlock resolver
nooptions       INVARIANTS              # Enable calls of extra sanity checking
nooptions       INVARIANT_SUPPORT       # Extra sanity checks of internal structures, required by INVARIANTS
nooptions       WITNESS                 # Enable checks to detect deadlocks and cycles
nooptions       WITNESS_SKIPSPIN        # Don't run witness on spinlocks for speed
nooptions       DIAGNOSTIC
nooptions       MALLOC_DEBUG_MAXZONES   # Separate malloc(9) zones
nooptions       BUF_TRACKING
nooptions       FULL_BUF_TRACKING

===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)