uvm_fault(fffffd806c2881d0,634e694000,0,2) at uvm_fault+0x238
upageflttrap(ffff8000279a5600,634e694000) at upageflttrap+0x85 sys/arch/amd64/amd64/trap.c:186
usertrap(ffff8000279a5600) at usertrap+0x204 sys/arch/amd64/amd64/trap.c:438
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7f7ffffc6180, 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(fffffd8065aff2c0,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline]
witness_checkorder(fffffd8065aff2c0,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105
rw_enter(fffffd8065aff2b0,1) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250
rrw_enter(fffffd8065aff2b0,1) at rrw_enter+0x8b sys/kern/kern_rwlock.c:465
VOP_LOCK(fffffd8065e1bde0,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:518
vn_lock(fffffd8065e1bde0,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:564
vn_rdwr(1,fffffd8065e1bde0,ffff800008a43340,e,0,1,e4aa1429f088be69,ffff8000006b6000,fffffd806446deb0,0) at vn_rdwr+0xb1 sys/kern/vfs_vnops.c:320
vndstrategy(fffffd806446deb0) at vndstrategy+0x3c4 sys/dev/vnd.c:341
physio(ffffffff81d41710,2902,0,ffffffff81b20340,ffff8000212a3990) at physio+0x289 sys/kern/kern_physio.c:163
spec_write(ffff8000212a37f0) at spec_write+0xd8 sys/kern/spec_vnops.c:302
VOP_WRITE(fffffd807131d3c0,ffff8000212a3990,1,fffffd807f7d7750) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245
vn_write(fffffd8064df0980,ffff8000212a3990,1) at vn_write+0x1a1 sys/kern/vfs_vnops.c:408
dofilewritev(ffff8000212b38a8,6,ffff8000212a3990,1,ffff8000212a3a80) at dofilewritev+0x19c sys/kern/sys_generic.c:375
sys_pad_pwrite(ffff8000212b38a8,ffff8000212a3a38,ffff8000212a3a80) at sys_pad_pwrite+0x92 sys_pwrite sys/kern/vfs_syscalls.c:3366 [inline]
sys_pad_pwrite(ffff8000212b38a8,ffff8000212a3a38,ffff8000212a3a80) at sys_pad_pwrite+0x92 sys/kern/vfs_syscalls.c:3438
syscall(ffff8000212a3b00) at syscall+0x57c mi_syscall sys/sys/syscall_mi.h:113 [inline]
syscall(ffff8000212a3b00) at syscall+0x57c sys/arch/amd64/amd64/trap.c:626
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x28db83cf940, count: -16