uvm_fault(fffffd806eb821d0,400000003000,0,1) at uvm_fault+0x272
kpageflttrap(ffff80003c540b10,400000003000) at kpageflttrap+0x2d0 sys/arch/amd64/amd64/trap.c:279
kerntrap(ffff80003c540b10) at kerntrap+0x14a sys/arch/amd64/amd64/trap.c:332
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
_copyin() at _copyin+0x57
syscall(ffff80003c540f60) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c540f60) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x38133614df0, count: -18
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(fffffd806dc3aa90,9,0) at witness_checkorder+0x1047
rw_do_enter_write(fffffd806dc3aa78,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233
rrw_enter(fffffd806dc3aa78,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616
VOP_LOCK(fffffd806dc3bb40,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524
vn_lock(fffffd806dc3bb40,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vn_closefile(fffffd805e92f578,ffff80002a4514b8) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd805e92f578,ffff80002a4514b8) at vn_closefile+0x111 sys/kern/vfs_vnops.c:615
fdrop(fffffd805e92f578,ffff80002a4514b8) at fdrop+0x126 sys/kern/kern_descrip.c:1265
knote_drop(fffffd807381c698,ffff80002a4514b8) at knote_drop+0x1a1 sys/kern/kern_event.c:2142
knote_remove(ffff80002a4514b8,fffffd806ea7f798,fffffd806ea7f820,5,0) at knote_remove+0x239 sys/kern/kern_event.c:2025
knote_fdclose(ffff80002a4514b8,5) at knote_fdclose+0xf9 sys/kern/kern_event.c:2049
fdrelease(ffff80002a4514b8,5) at fdrelease+0xf9 sys/kern/kern_descrip.c:749
syscall(ffff80003acb8340) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003acb8340) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xf9d62a58700, count: -14