uvm_fault(fffffd8067ce37a8,1b3171f000,0,2) at uvm_fault+0x278 sys/uvm/uvm_fault.c:-1
upageflttrap(ffff8000313e8220,1b3171fffc) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188
usertrap(ffff8000313e8220) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x757eb39d3df0, 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:438
witness_checkorder(fffffd806dc91658,9,0) at witness_checkorder+0x10fb sys/kern/subr_witness.c:-1
rw_do_enter_write(fffffd806dc91640,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233
rrw_enter(fffffd806dc91640,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:606
VOP_LOCK(fffffd806dc9a630,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527
vn_lock(fffffd806dc9a630,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vn_closefile(fffffd8061758c50,ffff8000ffff0a60) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd8061758c50,ffff8000ffff0a60) at vn_closefile+0x111 sys/kern/vfs_vnops.c:615
fdrop(fffffd8061758c50,ffff8000ffff0a60) at fdrop+0x126 sys/kern/kern_descrip.c:1267
knote_remove(ffff8000ffff0a60,fffffd806eb7c460,fffffd806eb7c4f0,4,0) at knote_remove+0x403 sys/kern/kern_event.c:2175
knote_fdclose(ffff8000ffff0a60,4) at knote_fdclose+0xf9 sys/kern/kern_event.c:2210
fdrelease(ffff8000ffff0a60,4) at fdrelease+0xf9 sys/kern/kern_descrip.c:750
syscall(ffff8000380c0bf0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff8000380c0bf0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xbb78d9a6620, count: -13