uvm_fault(fffffd806c654b90,9e4eb456000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:650
upageflttrap(ffff80003aba4ac0,9e4eb456000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003aba4ac0) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7c6596dc40e0, count: -11
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(fffffd806fb3ed70,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1
rw_do_enter_write(fffffd806fb3ed58,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234
rrw_enter(fffffd806fb3ed58,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffffd806fc47010,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
vn_lock(fffffd806fc47010,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:576
vn_closefile(fffffd806c2622e0,ffff8000fffe7cb0) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:298 [inline]
vn_closefile(fffffd806c2622e0,ffff8000fffe7cb0) at vn_closefile+0x111 sys/kern/vfs_vnops.c:621
fdrop(fffffd806c2622e0,ffff8000fffe7cb0) at fdrop+0x121 sys/kern/kern_descrip.c:1281
knote_drop(fffffd8068086880,ffff8000fffe7cb0) at knote_drop+0x1a1 sys/kern/kern_event.c:2296
knote_remove(ffff8000fffe7cb0,fffffd806f469460,fffffd806f4694f0,3,0) at knote_remove+0x215 sys/kern/kern_event.c:-1
knote_fdclose(ffff8000fffe7cb0,3) at knote_fdclose+0xf9 sys/kern/kern_event.c:2203
fdrelease(ffff8000fffe7cb0,3) at fdrelease+0xf9 sys/kern/kern_descrip.c:761
syscall(ffff80003c3e0e20) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3e0e20) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xff1de96e030, count: -14