uvm_fault(fffffd80768c8470,15f02e2b000,0,1) at uvm_fault+0x181 sys/uvm/uvm_fault.c:623
upageflttrap(ffff800029635990,15f02e2b000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
usertrap(ffff800029635990) at usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7f7ffffbf2b0, 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(fffffd806e4636f8,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline]
witness_checkorder(fffffd806e4636f8,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105
rw_enter(fffffd806e4636e8,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250
rrw_enter(fffffd806e4636e8,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:465
VOP_LOCK(fffffd80772fa290,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:518
vn_lock(fffffd80772fa290,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:567
uvn_io(fffffd8066391200,ffff8000296516e0,1,2b,1) at uvn_io+0x338 sys/uvm/uvm_vnode.c:1234
uvm_pager_put(fffffd8066391200,fffffd800736a6a0,ffff800029651778,ffff8000296517b8,2b,0,c976beda9e3a7c59) at uvm_pager_put+0x137 sys/uvm/uvm_pager.c:547
uvn_flush(fffffd8066391200,0,2000,b) at uvn_flush+0x532 sys/uvm/uvm_vnode.c:722
uvm_map_clean(fffffd8075501028,20000000,20003000,b) at uvm_map_clean+0x72b sys/uvm/uvm_map.c:4779
syscall(ffff8000296519b0) at syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline]
syscall(ffff8000296519b0) at syscall+0x435 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x9ed35242a20, count: -12