[Bug 267028] kernel panics when booting with ZFS and amdgpu.ko (both are required)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267028

--- Comment #44 from Andriy Gapon <avg@FreeBSD.org> ---
I think that in these frames we clearly see a bogus pointer / address:
#7  <signal handler called>
#8  vtozoneslab (va=18446735277616529408, zone=<optimized out>, 
    slab=<optimized out>) at /usr/src/sys/vm/uma_int.h:635
#9  free (addr=0xfffff80000000007, mtp=0xffffffff824332b0 <M_SOLARIS>)
    at /usr/src/sys/kern/kern_malloc.c:911
#10 0xffffffff8214d251 in nv_mem_free (nvp=<optimized out>, 
    buf=0xfffff80000000007, size=16688648)
    at /usr/src/sys/contrib/openzfs/module/nvpair/nvpair.c:216

I'd recommend poking around frames 11-13 to see from where that address comes.

Also, I don't get an impression that the latest crash is similar to earlier
ones.
kern_reboot / zfs__fini vs dbuf_evict_thread.

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