uvm_fault(fffffd806b8bd1d0,d79008cd000,0,1) at uvm_fault+0x238
upageflttrap(ffff80002e4d6fa0,d79008cdaa3) at upageflttrap+0x85 sys/arch/amd64/amd64/trap.c:186
usertrap(ffff80002e4d6fa0) at usertrap+0x204 sys/arch/amd64/amd64/trap.c:438
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7f7ffffda100, 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(fffffd807aea4b40,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline]
witness_checkorder(fffffd807aea4b40,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105
rw_enter(fffffd807aea4b30,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250
rrw_enter(fffffd807aea4b30,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:465
VOP_LOCK(fffffd8061b10de0,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:518
vn_lock(fffffd8061b10de0,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:564
uvn_io(fffffd8067c72340,ffff800027b87170,1,2b,1) at uvn_io+0x31a sys/uvm/uvm_vnode.c:1263
uvn_put(fffffd8067c72340,ffff800027b87170,1,2b) at uvn_put+0xd0 sys/uvm/uvm_vnode.c:926
uvm_pager_put(fffffd8067c72340,fffffd8007d8bf60,ffff800027b87208,ffff800027b87248,2b,0,1fe4cc2e04f697f2) at uvm_pager_put+0x137 sys/uvm/uvm_pager.c:545
uvn_flush(fffffd8067c72340,0,2000,b) at uvn_flush+0x532 sys/uvm/uvm_vnode.c:725
uvm_map_clean(fffffd806b8bd018,20000000,20002000,b) at uvm_map_clean+0x71b sys/uvm/uvm_map.c:4704
syscall(ffff800027b87440) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline]
syscall(ffff800027b87440) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:625
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe2058c61e20, count: -13