uvm_fault(fffffd8069e68460,d8422022000,0,2) at uvm_fault+0x238
upageflttrap(ffff80002e479a80,d8422022000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
usertrap(ffff80002e479a80) at usertrap+0x1aa sys/arch/amd64/amd64/trap.c:417
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7f7ffffef3f0, count: -15
ddb{0}> machine ddbcpu 1
Stopped at      db_enter+0x18:  addq    $0x8,%rsp
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
witness_checkorder(fffffd807c4e01a8,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline]
witness_checkorder(fffffd807c4e01a8,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105
rw_enter(fffffd807c4e0198,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250
rrw_enter(fffffd807c4e0198,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:465
VOP_LOCK(fffffd807c4f60f0,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:518
vn_lock(fffffd807c4f60f0,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:564
uvn_io(fffffd8079bbf298,ffff80002e47ec90,1,23,1) at uvn_io+0x31a sys/uvm/uvm_vnode.c:1263
uvn_put(fffffd8079bbf298,ffff80002e47ec90,1,23) at uvn_put+0xd0 sys/uvm/uvm_vnode.c:926
uvm_pager_put(fffffd8079bbf298,fffffd8007271620,ffff80002e47ed28,ffff80002e47ed68,23,0,6f1503b4046f9d5d) at uvm_pager_put+0x137 sys/uvm/uvm_pager.c:545
uvn_flush(fffffd8079bbf298,0,1000,3) at uvn_flush+0x532 sys/uvm/uvm_vnode.c:725
uvm_map_clean(fffffd8069e68e70,20000000,20001000,3) at uvm_map_clean+0x71b sys/uvm/uvm_map.c:4660
syscall(ffff80002e47ef60) at syscall+0x438 mi_syscall sys/sys/syscall_mi.h:101 [inline]
syscall(ffff80002e47ef60) at syscall+0x438 sys/arch/amd64/amd64/trap.c:599
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x329076ac0c0, count: -13