[Bug 276587] ccp(4) causes 'sysctl -a' to hang when reading OID 'kern.geom.conftxt'

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276587

            Bug ID: 276587
           Summary: ccp(4) causes 'sysctl -a' to hang when reading OID
                    'kern.geom.conftxt'
           Product: Base System
           Version: 14.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: freebsd@kumba.dev

The ccp(4) driver appears to work on my NAS machine's Ryzen 5 2200G a bit
better under 14.0-RELEASE, in that GELI can create encrypted swap w/o hanging
and as far as I can tell, that swap seems to work.  However, attempting to dump
all sysctl values w/ 'sysctl -a' will cause sysctl to do a hard hang when it
gets to OID 'kern.geom.conftxt'.  The process becomes unresponsive and cannot
be exited w/ ctrl+c, or killed by any signals, including SIGKILL.  It goes into
the D+ state and only a reboot can clear it.

Sample output from truss showing the hang-up on 'kern.geom.conftxt':
> 42815: 0.000007549 write(1,"\n",1)               = 1 (0x1)
> 42815: 0.000007590 __sysctl("sysctl.next",5,0x45a51ae7830,0x45a51ae7828,0x0,0) = 0 (0x0)
> 42815: 0.000010670 __sysctl("sysctl.name { 1.2147483316.2147483313 }",5,0x45a51ae6f70,0x45a51ae6af0,0x0,0) = 0 (0x0)
> 42815: 0.000008760 __sysctl("sysctl.oidfmt kern.geom.conftxt",5,0x45a51ae73e0,0x45a51ae6af8,0x0,0) = 0 (0x0)
> ^C^C

Some dmesg/pciconf info, in case it helps:
dmesg:
> # dmesg | grep ccp
> ccp0: <AMD CCP-5a> mem 0xfc700000-0xfc7fffff,0xfc884000-0xfc885fff irq 54 at device 0.2 on pci10

> [26] GEOM_ELI: Device da0p2.eli created.
> [26] GEOM_ELI: Encryption: AES-XTS 256
> [26] GEOM_ELI:     Crypto: hardware

pciconf -lvcV
ccp0@pci0:10:0:2:       class=0x108000 rev=0x00 hdr=0x00 vendor=0x1022
device=0x15df subvendor=0x1043 subdevice=0x876b
    vendor     = 'Advanced Micro Devices, Inc. [AMD]'
    device     = 'Family 17h (Models 10h-1fh) Platform Security Processor'
    class      = encrypt/decrypt
    cap 09[48] = vendor (length 8)
    cap 01[50] = powerspec 3  supports D0 D3  current D0
    cap 10[64] = PCI-Express 2 endpoint max data 256(256) RO NS
                 max read 512
                 link x16(x16) speed 8.0(8.0) ASPM disabled(L0s/L1)
    cap 05[a0] = MSI supports 2 messages, 64 bit
    cap 11[c0] = MSI-X supports 2 messages, enabled
                 Table in map 0x24[0x0], PBA in map 0x24[0x1000]
    ecap 000b[100] = Vendor [1] ID 0001 Rev 1 Length 16

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