login: spin lock 0xffffffff81f455d8 (smp rendezvous) held by 0xfffff800037cd000 (tid 100024) too long
timeout stopping cpus
panic: spin lock held too long
cpuid = 2
time = 1566949878
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00005d43d0
vpanic() at vpanic+0x19d/frame 0xfffffe00005d4420
panic() at panic+0x43/frame 0xfffffe00005d4480
_mtx_lock_indefinite_check() at _mtx_lock_indefinite_check+0x6d/frame 0xfffffe00005d4490
_mtx_lock_spin_cookie() at _mtx_lock_spin_cookie+0xd5/frame 0xfffffe00005d4500
smp_targeted_tlb_shootdown() at smp_targeted_tlb_shootdown+0x3de/frame 0xfffffe00005d4570
pmap_invalidate_page() at pmap_invalidate_page+0xfd/frame 0xfffffe00005d45e0
pmap_ts_referenced() at pmap_ts_referenced+0x792/frame 0xfffffe00005d4670
vm_pageout_worker() at vm_pageout_worker+0x10c0/frame 0xfffffe00005d4a30
vm_pageout() at vm_pageout+0x176/frame 0xfffffe00005d4a70
fork_exit() at fork_exit+0x83/frame 0xfffffe00005d4ab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00005d4ab0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic
[ thread pid 21 tid 100107 ]
Stopped at      kdb_enter+0x3b: movq    $0,kdb_why
db> 
db>