[Bug 287482] panic: VERIFY3(zfs_btree_find(tree, node, &where) == NULL) failed

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287482

            Bug ID: 287482
           Summary: panic: VERIFY3(zfs_btree_find(tree, node, &where) ==
                    NULL) failed
           Product: Base System
           Version: 14.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: mike@sentex.net

Created attachment 261203
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=261203&action=edit
full boot log

Using a 14.3 VM image seems to panic when periodic daily runs. This panic
happens in the VM under beehyve as well when the underlying image is
transferred to a disk and booted up on real hardware. 

vmrun.sh -t tap0 -d ./143.raw -E vm0

root@freebsd:~ # periodic daily
panic: VERIFY3(zfs_btree_find(tree, node, &where) == NULL) failed 
(0xfffff8001cc99ba0x == 0x)

cpuid = 1
time = 1749727473
KDB: stack backtrace:
#0 0xffffffff80ba8f1d at kdb_backtrace+0x5d
#1 0xffffffff80b5aa11 at vpanic+0x161
#2 0xffffffff82181c4a at spl_panic+0x3a
#3 0xffffffff821d4aae at zfs_btree_add+0x6e
#4 0xffffffff82315905 at zap_lockdir_impl+0x325
#5 0xffffffff823155a4 at zap_lockdir+0x84
#6 0xffffffff82318b15 at zap_cursor_retrieve+0x175
#7 0xffffffff821a01a3 at zfs_freebsd_readdir+0x383
#8 0xffffffff81112050 at VOP_READDIR_APV+0x20
#9 0xffffffff80c56a19 at kern_getdirentries+0x229
#10 0xffffffff80c56dc9 at sys_getdirentries+0x29
#11 0xffffffff8104e4c7 at amd64_syscall+0x117
#12 0xffffffff8102469b at fast_syscall_common+0xf8
Uptime: 24s
Automatic reboot in 15 seconds - press a key on the console to abort
--> Press a key on the console to reboot,
--> or switch off the system now.

full boot log attached.

discussed in 
https://lists.freebsd.org/archives/freebsd-stable/2025-June/002884.html

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