uvm_fault(fffffd8075ef27b8,4276b9c2000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:656
upageflttrap(ffff80003c445310,4276b9c2000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003c445310) at usertrap+0x42f sys/arch/amd64/amd64/trap.c:622
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7486e1d7cd70, count: -12
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(fffffd806e0b9590,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1
rw_do_enter_write(fffffd806e0b9578,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234
rrw_enter(fffffd806e0b9578,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffffd806e0bc630,2001) at VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527
vn_lock(fffffd806e0bc630,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vn_closefile(fffffd806a5b5870,ffff8000fffe7ca8) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd806a5b5870,ffff8000fffe7ca8) at vn_closefile+0x111 sys/kern/vfs_vnops.c:615
fdrop(fffffd806a5b5870,ffff8000fffe7ca8) at fdrop+0x121 sys/kern/kern_descrip.c:1280
knote_drop(fffffd806a810d38,ffff8000fffe7ca8) at knote_drop+0x1a1 sys/kern/kern_event.c:2296
knote_remove(ffff8000fffe7ca8,fffffd80752181c0,fffffd8075218250,4,0) at knote_remove+0x2f6 sys/kern/kern_event.c:2180
knote_fdclose(ffff8000fffe7ca8,4) at knote_fdclose+0xf9 sys/kern/kern_event.c:2203
fdrelease(ffff8000fffe7ca8,4) at fdrelease+0xf9 sys/kern/kern_descrip.c:760
syscall(ffff80003c41aae0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c41aae0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xc3c8010aad0, count: -14