[Bug 277638] Crash when running devinfo on RPI CM4

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277638

            Bug ID: 277638
           Summary: Crash when running devinfo on RPI CM4
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: hp@tmm.cx

Note: This was also tested on 14.0-RELEASE with the same results.

To boot the CM4 it is necessary to set devmatch_enable="NO". This papers over
the same crash it seems as gets triggered when running "devinfo" with it
enabled.

Doing this results in the following backtrace (obtained using kgdb)

#0  0xffff00000042b1c8 in doadump (textdump=0, textdump@entry=3234298464) at
/usr/src/sys/kern/kern_shutdown.c:403
#1  0xffff0000000efaa4 in db_dump (dummy=<optimized out>, dummy2=<optimized
out>, dummy3=<optimized out>, dummy4=<optimized out>) at
/usr/src/sys/ddb/db_command.c:590
#2  0xffff0000000ef880 in db_command (last_cmdp=<optimized out>,
cmd_table=<optimized out>, dopager=true) at /usr/src/sys/ddb/db_command.c:503
#3  0xffff0000000ef568 in db_command_loop () at
/usr/src/sys/ddb/db_command.c:550
#4  0xffff0000000f3050 in db_trap (type=<optimized out>, code=<optimized out>)
at /usr/src/sys/ddb/db_main.c:267
#5  0xffff00000047a94c in kdb_trap (type=60, code=0, tf=<optimized out>) at
/usr/src/sys/kern/subr_kdb.c:790
#6  <signal handler called>
#7  kdb_enter (why=<optimized out>, msg=<optimized out>) at
/usr/src/sys/kern/subr_kdb.c:556
#8  0xffff00000042b480 in vpanic (fmt=<optimized out>, ap=...) at
/usr/src/sys/kern/kern_shutdown.c:961
#9  0xffff00000042b29c in panic (fmt=0x12 <error: Cannot access memory at
address 0x12>) at /usr/src/sys/kern/kern_shutdown.c:889
#10 0xffff00000077e964 in data_abort (td=0xffff0000c3a86c80,
frame=0xffff0000c0c783b0, esr=2516582404, far=<optimized out>, lower=0) at
/usr/src/sys/arm64/arm64/trap.c:398
#11 <signal handler called>
#12 strlcpy (dst=dst@entry=0xffff0000c0c78570 "", src=0xdeadc0dedeadc0de
<error: Cannot access memory at address 0xdeadc0dedeadc0de>,
dsize=dsize@entry=32) at /usr/src/sys/libkern/strlcpy.c:36
#13 0xffff000000486c4c in sysctl_rman (oidp=<optimized out>, arg1=<optimized
out>, arg2=<optimized out>, req=0xffff0000c0c786d0) at
/usr/src/sys/kern/subr_rman.c:998
#14 0xffff00000043d3e4 in sysctl_root_handler_locked
(oid=oid@entry=0xffff000000a3aa60 <sysctl___hw_bus_rman>,
arg1=arg1@entry=0xffff0000c0c787ac, arg2=arg2@entry=3,
req=req@entry=0xffff0000c0c786d0, 
    tracker=tracker@entry=0xffff0000c0c78658) at
/usr/src/sys/kern/kern_sysctl.c:199
#15 0xffff00000043c754 in sysctl_root (oidp=<optimized out>,
arg1=0xffff0000c0c787ac, arg1@entry=0xffff0000c0c787a0, arg2=3, arg2@entry=6,
req=req@entry=0xffff0000c0c786d0) at /usr/src/sys/kern/kern_sysctl.c:2407
#16 0xffff00000043cdec in userland_sysctl (td=td@entry=0xffff0000c3a86c80,
name=name@entry=0xffff0000c0c787a0, namelen=<optimized out>, old=0x1e0e686d760,
oldlenp=<optimized out>, inkernel=<optimized out>, inkernel@entry=-1060665472, 
    new=<optimized out>, newlen=<optimized out>, retval=0xffff0000c0c78798,
flags=0) at /usr/src/sys/kern/kern_sysctl.c:2564
#17 0xffff00000043cc68 in sys___sysctl (td=0xffff0000c3a86c80,
uap=0xffff0000c3a87080) at /usr/src/sys/kern/kern_sysctl.c:2437
#18 0xffff00000077df4c in syscallenter (td=0xffff0000c3a86c80) at
/usr/src/sys/arm64/arm64/../../kern/subr_syscall.c:186
#19 svc_handler (td=0xffff0000c3a86c80, frame=<optimized out>) at
/usr/src/sys/arm64/arm64/trap.c:198
#20 do_el0_sync (td=0xffff0000c3a86c80, frame=<optimized out>) at
/usr/src/sys/arm64/arm64/trap.c:640
#21 <signal handler called>
#22 0x000001e0e9df9944 in ?? ()
#23 0x000001e0e9d7e888 in ?? ()

After looking at the code a bit it seems that the "rm" entry is invalid at that
point. I don't really know how to continue debugging this.

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