uvm_fault(fffffd806ce4ae18,c86482e5000,0,1) at uvm_fault+0x2f0 sys/uvm/uvm_fault.c:637
upageflttrap(ffff800030983200,c86482e5100) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188
usertrap(ffff800030983200) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x752e921f0a80, count: -13
ddb{0}> machine ddbcpu 1
Stopped at      db_enter+0x25:  addq    $0x8,%rsp
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437
witness_checkorder(fffffd80633ed2c8,9,0) at witness_checkorder+0x1047
rw_enter(fffffd80633ed2b8,1) at rw_enter+0x122
rrw_enter(fffffd80633ed2b8,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464
VOP_LOCK(fffffd805ecafd88,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524
vn_lock(fffffd805ecafd88,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564
vn_rdwr(0,fffffd805ecafd88,ffff800011a26080,1f,0,1,a7b7913f963a516c,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320
vndstrategy(fffffd805fe74d28) at vndstrategy+0x4ff sys/dev/vnd.c:342
physio(ffffffff816958d0,2902,8000,ffffffff81a7c8a0,ffff8000369c17b0) at physio+0x2f6 sys/kern/kern_physio.c:162
spec_read(ffff8000369c15a0) at spec_read+0x155 sys/kern/spec_vnops.c:215
VOP_READ(fffffd806dd79eb8,ffff8000369c17b0,0,fffffd807f7d3478) at VOP_READ+0x102 sys/kern/vfs_vops.c:227
vn_read(fffffd8079f530b8,ffff8000369c17b0,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369
dofilereadv(ffff8000371d4ce8,4,ffff8000369c17b0,0,ffff8000369c1870) at dofilereadv+0x230 sys/kern/sys_generic.c:252
sys_readv(ffff8000371d4ce8,ffff8000369c1920,ffff8000369c1870) at sys_readv+0xd8 sys/kern/sys_generic.c:199
syscall(ffff8000369c1920) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline]
syscall(ffff8000369c1920) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xae581b31fe0, count: -16