panic: acquiring blockable sleep lock with spinlock or critical section held (rwlock) vmmaplk
Stopped at      db_enter+0x25:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
 144777  94369      0   0x8001000  0x4080000    0K syz-executor
*498138  41513      0     0x14000      0x200    1  reaper
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff8306e697) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_checkorder(ffffffff835a0308,1,0) at witness_checkorder+0x1197 witness_debugger sys/kern/subr_witness.c:2518 [inline]
witness_checkorder(ffffffff835a0308,1,0) at witness_checkorder+0x1197 sys/kern/subr_witness.c:780
rw_enter_read(ffffffff835a02f8) at rw_enter_read+0xab sys/kern/kern_rwlock.c:112
uvmfault_lookup(ffff800029fe5920,0) at uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1785
uvm_fault_check(ffff800029fe5920,ffff800029fe5958,ffff800029fe5980) at uvm_fault_check+0x47 sys/uvm/uvm_fault.c:672
uvm_fault(ffffffff835a0218,7f86799b9000,0,2) at uvm_fault+0x112 sys/uvm/uvm_fault.c:600
kpageflttrap(ffff800029fe5ac0,7f86799b9108) at kpageflttrap+0x2d0 sys/arch/amd64/amd64/trap.c:279
kerntrap(ffff800029fe5ac0) at kerntrap+0x14a sys/arch/amd64/amd64/trap.c:332
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
pmap_page_remove(fffffd8008326b80) at pmap_page_remove+0x45d _atomic_swap_64 machine/atomic.h:117 [inline]
pmap_page_remove(fffffd8008326b80) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2005
uvm_anfree_list(fffffd805a35c030,0) at uvm_anfree_list+0xd6
amap_wipeout(fffffd806460fcd0) at amap_wipeout+0x248 sys/uvm/uvm_amap.c:502
uvm_unmap_detach(ffff800029fe5cf0,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353
end trace frame: 0xffff800029fe5d30, count: 0
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports.  Insufficient info makes it difficult to find and fix bugs.