[Bug 262760] Trying to import certain zpool leads to kernel panic on amd64

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262760

            Bug ID: 262760
           Summary: Trying to import certain zpool leads to kernel panic
                    on amd64
           Product: Base System
           Version: Unspecified
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: beebeetles@posteo.de

After destroying a zfs dataset on my zfs root partition, my machine entered a
boot-reboot cycle. Preliminary investigation appears to show that this was
caused by a kernel panic following a `zpool import`. Attempts to import the
said zpool trigger kernel panics on two different amd64 machines I have tested
on, but this problem does not seem to affect aarch64 machines. 

Below is the kernel stack trace:

```
panic: VERIFY3(l->blk_birth == r->blk_birth) failed (2270319 == 2248100) 

cpuid = 7
time = [...]
KDB: stack backtrace:
db_trace_self_wrapper() at [...]
vpanic() at [...]
spl_panic() at [...]
livelist_compare() at [...]
avl_find() at [...]
dsl_livelist_iterate() at [...]
bpobj_iterate_blkptrs() at [...]
bpobj_iterate_impl() at [...]
dsl_process_sub_livelist() at [...]
spa_livelist_delete_cb() at [...]
zthr_procedure() at [...]
fork_exit() at [...]
fork_trampoline() at [...]
--- trap [...], rip = [...], rsp = [...], rbp = [...] ---
KDB: enter: panic
```

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