"Duplicated clock registration" panic on -CURRENT

I have an old BananaPi M1 (Allwinner A20, dual-core Cortex-A7) that I
am trying to upgrade from FreeBSD 14 to FreeBSD 15-CURRENT and got an
an unexpected panic during boot with my custom kernel.  I tried
building a GENERIC kernel and got the same.  OTOH, I'm not seeing any
problems with the same revision on old RaspberryPi 2 (BCM2836).  The
cause isn't clear to me and I wonder if anyone can suggest where to
look for the cause.

FreeBSD 15.0-CURRENT #0 current-c296623-g9d6043f980a2-dirty: Sun Jan 19 18:01:23 AEDT 2025
    [email protected]:/usr/obj/usr/src/arm.armv7/sys/GENERIC arm
...
panic: Duplicated clock registration: osc32k

cpuid = 0
time = 1
KDB: stack backtrace:
db_trace_self() at db_trace_self
         pc = 0xc060c7d8  lr = 0xc00752c8 (db_trace_self_wrapper+0x30)
         sp = 0xc0e14b48  fp = 0xc0e14c60
db_trace_self_wrapper() at db_trace_self_wrapper+0x30
         pc = 0xc00752c8  lr = 0xc02f9468 (vpanic+0x140)
         sp = 0xc0e14c68  fp = 0xc0e14c88
         r4 = 0x00000100  r5 = 0x00000000
         r6 = 0xc07108b4  r7 = 0xc0b45b04
vpanic() at vpanic+0x140
         pc = 0xc02f9468  lr = 0xc02f9328 (vpanic)
         sp = 0xc0e14c90  fp = 0xc0e14c94
         r4 = 0xd408ea00  r5 = 0xc08e8310
         r6 = 0xc0775126  r7 = 0xd408ea00
         r8 = 0xc095f8b8  r9 = 0xc08e8470
        r10 = 0xd408ea00
vpanic() at vpanic
         pc = 0xc02f9328  lr = 0xc008963c (clknode_create+0x134)
         sp = 0xc0e14c9c  fp = 0xc0e14cf0
         r4 = 0xd408ea00  r5 = 0xc095f8b8
         r6 = 0xc08e8470  r7 = 0xd408ea00
         r8 = 0xc0e14c94  r9 = 0xc02f9328
        r10 = 0xc0e14c9c
clknode_create() at clknode_create+0x134
         pc = 0xc008963c  lr = 0xc008caec (clknode_fixed_register+0x20)
         sp = 0xc0e14cf8  fp = 0xc0e14d08
         r4 = 0xd6d05e80  r5 = 0xc095f8b8
         r6 = 0xd6d05e80  r7 = 0xc095f8e8
         r8 = 0xc0b351a4  r9 = 0xc33ba7c0
        r10 = 0x80040003
clknode_fixed_register() at clknode_fixed_register+0x20
         pc = 0xc008caec  lr = 0xc0648c64 (aw_rtc_attach+0x1c0)
         sp = 0xc0e14d10  fp = 0xc0e14d50
         r4 = 0xd4015b80  r5 = 0xc3330a40
         r6 = 0xd6d05e80 r10 = 0x80040003
aw_rtc_attach() at aw_rtc_attach+0x1c0
         pc = 0xc0648c64  lr = 0xc0338d00 (device_attach+0x5c8)
         sp = 0xc0e14d58  fp = 0xc0e14da0
         r4 = 0xd4015b80  r5 = 0xd4017580
         r6 = 0x387b0459  r7 = 0x00000000
         r8 = 0xc0bbbf24 r10 = 0x80040003
device_attach() at device_attach+0x5c8
         pc = 0xc0338d00  lr = 0xc033b038 (bus_generic_new_pass+0x13c)
         sp = 0xc0e14da8  fp = 0xc0e14dc0
         r4 = 0xd4015b80  r5 = 0xc091595c
         r6 = 0xc0985490  r7 = 0xc075a0c1
         r8 = 0xc0b53234  r9 = 0xc09849d4
        r10 = 0xc0b351a8
bus_generic_new_pass() at bus_generic_new_pass+0x13c
         pc = 0xc033b038  lr = 0xc033afc4 (bus_generic_new_pass+0xc8)
         sp = 0xc0e14dc8  fp = 0xc0e14de0
         r4 = 0xd4017580  r5 = 0xc091595c
         r6 = 0xc0985490  r7 = 0xc075a0c1
         r8 = 0xc0b53234 r10 = 0xc0b351a8
bus_generic_new_pass() at bus_generic_new_pass+0xc8
         pc = 0xc033afc4  lr = 0xc033afc4 (bus_generic_new_pass+0xc8)
         sp = 0xc0e14de8  fp = 0xc0e14e00
         r4 = 0xd4017b00  r5 = 0xc091595c
         r6 = 0xc0985490  r7 = 0xc075a0c1
         r8 = 0xc0b53234 r10 = 0xc0b351a8
bus_generic_new_pass() at bus_generic_new_pass+0xc8
         pc = 0xc033afc4  lr = 0xc033afc4 (bus_generic_new_pass+0xc8)
         sp = 0xc0e14e08  fp = 0xc0e14e20
         r4 = 0xd4017b80  r5 = 0xc091595c
         r6 = 0xc0985490  r7 = 0xc075a0c1
         r8 = 0xc0b53234 r10 = 0xc0b351a8
bus_generic_new_pass() at bus_generic_new_pass+0xc8
         pc = 0xc033afc4  lr = 0xc033d8a4 (root_bus_configure+0x48)
         sp = 0xc0e14e28  fp = 0xc0e14e40
         r4 = 0xc091595c  r5 = 0xd4018000
         r6 = 0xc0b53234  r7 = 0xd403d9e0
         r8 = 0xc0b53258 r10 = 0xc0b351a8
root_bus_configure() at root_bus_configure+0x48
         pc = 0xc033d8a4  lr = 0xc027dcec (mi_startup+0x228)
         sp = 0xc0e14e48  fp = 0xc0e14e88
         r4 = 0xc0b351ac  r5 = 0x03800000
         r6 = 0xc095c3f4  r7 = 0xc0916094
         r8 = 0x00000000 r10 = 0xc0b351a8
mi_startup() at mi_startup+0x228
         pc = 0xc027dcec  lr = 0xc027dcec (mi_startup+0x228)
         sp = 0xc0e14e6c  fp = 0xc0e14e88
KDB: enter: panic

-- 
Peter Jeremy

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