uvm_fault(fffffd8067755ad8,1b6dc156000,0,2) at uvm_fault+0x272
upageflttrap(ffff8000310a7f50,1b6dc156000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188
usertrap(ffff8000310a7f50) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7c12f1f98bb0, count: -15
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(fffffd806dd48758,9,0) at witness_checkorder+0x1047
rw_do_enter_write(fffffd806dd48740,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233
rrw_enter(fffffd806dd48740,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616
VOP_LOCK(fffffd80691cb438,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524
vn_lock(fffffd80691cb438,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vfs_getcwd_common(fffffd80691cb438,fffffd80691cb360,0,0,200,0,c561656af7f74e53) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287
vn_isunder(fffffd80691cb438,fffffd80691cb360,ffff80003b0e4a78) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694
unp_externalize(fffffd807eb93c00,ec,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086
soreceive(ffff800010fd5b20,ffff80003c50a748,ffff80003c50a6f8,0,ffff80003c50a738,ffff80003c50a8bc,e44970e7bef752d4) at soreceive+0xc73 sys/kern/uipc_socket.c:1021
recvit(ffff80003b0e4a78,5,ffff80003c50a890,0,ffff80003c50a940) at recvit+0x40a sys/kern/uipc_syscalls.c:1072
sys_recvmsg(ffff80003b0e4a78,ffff80003c50a9f0,ffff80003c50a940) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872
syscall(ffff80003c50a9f0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c50a9f0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x861a48a9bd0, count: -14