uvm_fault(fffffd806be38738,f4b42fb0000,0,1) at uvm_fault+0x159 sys/uvm/uvm_fault.c:673
upageflttrap(ffff800031d48b10,f4b42fb08a0) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188
usertrap(ffff800031d48b10) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x794447f70390, 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(fffffd806de89cc0,9,0) at witness_checkorder+0x1047
rw_do_enter_write(fffffd806de89ca8,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233
rrw_enter(fffffd806de89ca8,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616
VOP_LOCK(fffffd806de8acf0,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524
vn_lock(fffffd806de8acf0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vn_closefile(fffffd806b340d18,ffff80002a42af98) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd806b340d18,ffff80002a42af98) at vn_closefile+0x111 sys/kern/vfs_vnops.c:615
fdrop(fffffd806b340d18,ffff80002a42af98) at fdrop+0x126 sys/kern/kern_descrip.c:1265
knote_drop(fffffd806afbe1f0,ffff80002a42af98) at knote_drop+0x1a1 sys/kern/kern_event.c:2142
knote_remove(ffff80002a42af98,fffffd806eb68798,fffffd806eb68820,4,0) at knote_remove+0x239 sys/kern/kern_event.c:2025
knote_fdclose(ffff80002a42af98,4) at knote_fdclose+0xf9 sys/kern/kern_event.c:2049
fdrelease(ffff80002a42af98,4) at fdrelease+0xf9 sys/kern/kern_descrip.c:749
syscall(ffff80003a4d46f0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003a4d46f0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x1272710a360, count: -14