uvm_fault(fffffd807a864750,f4ebea9b000,0,1) at uvm_fault+0xf2 sys/uvm/uvm_fault.c:601
upageflttrap(ffff80002e4acb50,f4ebea9b000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
usertrap(ffff80002e4acb50) at usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7f7ffffe9e50, count: -14
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(fffffd805f68ed58,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline]
witness_checkorder(fffffd805f68ed58,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105
rw_enter(fffffd805f68ed48,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250
rrw_enter(fffffd805f68ed48,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:465
VOP_LOCK(fffffd805fd40490,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:518
vn_lock(fffffd805fd40490,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:564
uvn_io(fffffd8068392698,ffff800021358a60,1,2b,1) at uvn_io+0x31a sys/uvm/uvm_vnode.c:1240
uvm_pager_put(fffffd8068392698,fffffd800715c860,ffff800021358af8,ffff800021358b38,2b,0,de9ba237b79aee9f) at uvm_pager_put+0x137 sys/uvm/uvm_pager.c:545
uvn_flush(fffffd8068392698,0,1000,b) at uvn_flush+0x532 sys/uvm/uvm_vnode.c:725
uvm_map_clean(fffffd8069f86180,20000000,20004000,b) at uvm_map_clean+0x72b sys/uvm/uvm_map.c:4634
syscall(ffff800021358d30) at syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline]
syscall(ffff800021358d30) at syscall+0x435 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd9c131cd220, count: -12