uvm_fault(fffffd8070307528,56ea4bc9000,0,2) at uvm_fault+0x238
upageflttrap(ffff8000297d5f00,56ea4bc9000) at upageflttrap+0x85 sys/arch/amd64/amd64/trap.c:186
usertrap(ffff8000297d5f00) at usertrap+0x204 sys/arch/amd64/amd64/trap.c:438
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x56dc50d7f00, count: -13
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(fffffd806eeb1f80,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline]
witness_checkorder(fffffd806eeb1f80,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105
rw_enter(fffffd806eeb1f70,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250
rrw_enter(fffffd806eeb1f70,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:465
VOP_LOCK(fffffd8069163210,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:518
vn_lock(fffffd8069163210,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:564
uvn_io(fffffd80763b43a0,ffff80002e42b690,1,2b,1) at uvn_io+0x31a sys/uvm/uvm_vnode.c:1263
uvn_put(fffffd80763b43a0,ffff80002e42b690,1,2b) at uvn_put+0xd0 sys/uvm/uvm_vnode.c:926
uvm_pager_put(fffffd80763b43a0,fffffd800753ac00,ffff80002e42b728,ffff80002e42b768,2b,0,99617d7b9cb8cc54) at uvm_pager_put+0x137 sys/uvm/uvm_pager.c:545
uvn_flush(fffffd80763b43a0,0,1000,b) at uvn_flush+0x532 sys/uvm/uvm_vnode.c:725
uvm_map_clean(fffffd8070307a50,20000000,20003000,b) at uvm_map_clean+0x71b sys/uvm/uvm_map.c:4703
syscall(ffff80002e42b960) at syscall+0x555 mi_syscall sys/sys/syscall_mi.h:113 [inline]
syscall(ffff80002e42b960) at syscall+0x555 sys/arch/amd64/amd64/trap.c:626
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xc15148c9ee0, count: -13