[Bug 243117] panic: keg dma coherent 32 initialization after use. (MIPS MALTA64)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243117

            Bug ID: 243117
           Summary: panic: keg dma coherent 32 initialization after use.
                    (MIPS MALTA64)
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: arichardson at FreeBSD.org

With today's HEAD I get the following panic when booting a MALTA64 kernel on
QEMU:

Breakpoint 1, panic (fmt=0xffffffff80766a14 "keg %s initialization after use.")
    at /exports/users/alr48/sources/freebsd/sys/kern/kern_shutdown.c:835
835             vpanic(fmt, ap);
(gdb) bt
#0  panic (fmt=0xffffffff80766a14 "keg %s initialization after use.")
    at /exports/users/alr48/sources/freebsd/sys/kern/kern_shutdown.c:835
#1  0xffffffff8068a1f4 in uma_zone_set_allocf (zone=<optimized out>,
    allocf=0xffffffff8070a180 <busdma_bufalloc_alloc_uncacheable>)
    at /exports/users/alr48/sources/freebsd/sys/vm/uma_core.c:4265
#2  0xffffffff80709f68 in busdma_bufalloc_create (name=<optimized out>,
    minimum_alignment=<optimized out>,
    alloc_func=0xffffffff8070a180 <busdma_bufalloc_alloc_uncacheable>,
    free_func=0xffffffff8070a1e0 <busdma_bufalloc_free_uncacheable>,
    zcreate_flags=<optimized out>)
    at /exports/users/alr48/sources/freebsd/sys/kern/subr_busdma_bufalloc.c:110
#3  0xffffffff806e0678 in busdma_init (dummy=<optimized out>)
    at /exports/users/alr48/sources/freebsd/sys/mips/mips/busdma_machdep.c:246
#4  0xffffffff803a3f40 in mi_startup ()
    at /exports/users/alr48/sources/freebsd/sys/kern/init_main.c:314
#5  0xffffffff80100388 in _locore ()
    at /exports/users/alr48/sources/freebsd/sys/mips/mips/locore.S:201

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