[Bug 241403] debugnet_mbuf_reinit panics with "m_getzone: invalid cluster size 0"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241403

            Bug ID: 241403
           Summary: debugnet_mbuf_reinit panics with "m_getzone: invalid
                    cluster size 0"
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: np at FreeBSD.org
                CC: cem at freebsd.org

I updated multiple systems to r353877 today and two of them (out of 5) panicked
on reboot.  The rest booted up properly.

panic: m_getzone: invalid cluster size 0
cpuid = 1
time = 1571705154
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe006df2b930
vpanic() at vpanic+0x17e/frame 0xfffffe006df2b990
panic() at panic+0x43/frame 0xfffffe006df2b9f0
debugnet_mbuf_reinit() at debugnet_mbuf_reinit+0x21b/frame 0xfffffe006df2ba30
debugnet_any_ifnet_update() at debugnet_any_ifnet_update+0xfa/frame
0xfffffe006df2ba80
do_link_state_change() at do_link_state_change+0x1eb/frame 0xfffffe006df2bad0
taskqueue_run_locked() at taskqueue_run_locked+0x103/frame 0xfffffe006df2bb30
taskqueue_run() at taskqueue_run+0x6f/frame 0xfffffe006df2bb50
ithread_loop() at ithread_loop+0x1db/frame 0xfffffe006df2bbb0
fork_exit() at fork_exit+0x7e/frame 0xfffffe006df2bbf0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe006df2bbf0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic
[ thread pid 12 tid 100020 ]
Stopped at      kdb_enter+0x37: movq    $0,0x106feb6(%rip)

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