uvm_fault(fffffd806c5a7e88,37d56aca000,0,2) at uvm_fault+0x248
upageflttrap(ffff80002e43ef70,37d56aca000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
usertrap(ffff80002e43ef70) at usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x37c961d0c00, 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(fffffd806787e1b0,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline]
witness_checkorder(fffffd806787e1b0,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105
rw_enter(fffffd806787e1a0,1) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250
rrw_enter(fffffd806787e1a0,1) at rrw_enter+0x8b sys/kern/kern_rwlock.c:465
VOP_LOCK(fffffd8074bf08d8,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:534
vn_lock(fffffd8074bf08d8,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:567
vn_rdwr(0,fffffd8074bf08d8,ffff800008943040,f2,0,1,2828dc1b46932506,ffff8000006b6000,fffffd807c62c5e0,0) at vn_rdwr+0xb1 sys/kern/vfs_vnops.c:323
vndstrategy(fffffd807c62c5e0) at vndstrategy+0x3c4 sys/dev/vnd.c:342
physio(ffffffff814e3470,2902,8000,ffffffff81ce2d40,ffff80002e445528) at physio+0x289 sys/kern/kern_physio.c:163
spec_read(ffff80002e445380) at spec_read+0xf5 sys/kern/spec_vnops.c:222
VOP_READ(fffffd806feb73e8,ffff80002e445528,0,fffffd807f7d77e0) at VOP_READ+0xbf sys/kern/vfs_vops.c:227
vn_read(fffffd80686f0398,ffff80002e445528,0) at vn_read+0x126 sys/kern/vfs_vnops.c:372
dofilereadv(ffff8000211e02b0,3,ffff80002e445528,0,ffff80002e445620) at dofilereadv+0x19e sys/kern/sys_generic.c:253
sys_read(ffff8000211e02b0,ffff80002e4455c8,ffff80002e445620) at sys_read+0x83 sys/kern/sys_generic.c:173
syscall(ffff80002e445690) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002e445690) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x989d8bbf750, count: -16