uvm_fault(fffffd806964e748,d71562b3000,0,1) at uvm_fault+0x106 sys/uvm/uvm_fault.c:668
upageflttrap(ffff80003c5e1460,d71562b3708) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188
usertrap(ffff80003c5e1460) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7c826ce2dce0, 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(fffffd8065482968,9,0) at witness_checkorder+0x1047
rw_do_enter_write(fffffd8065482950,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233
rrw_enter(fffffd8065482950,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616
VOP_LOCK(fffffd806211e600,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524
vn_lock(fffffd806211e600,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vfs_getcwd_common(fffffd806211e600,fffffd806e5d9b48,0,0,200,0,4bfedcaecc38224e) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287
vn_isunder(fffffd806211e600,fffffd806e5d9b48,ffff80002a495c80) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694
unp_externalize(fffffd8069663b00,33,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086
soreceive(ffff8000015c2b40,ffff80002a43c958,ffff80002a43c908,0,ffff80002a43c948,ffff80002a43cacc,d935564b25959d2b) at soreceive+0xc73 sys/kern/uipc_socket.c:1021
recvit(ffff80002a495c80,9,ffff80002a43caa0,0,ffff80002a43cb50) at recvit+0x40a sys/kern/uipc_syscalls.c:1072
sys_recvmsg(ffff80002a495c80,ffff80002a43cc00,ffff80002a43cb50) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872
syscall(ffff80002a43cc00) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a43cc00) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x8caefb0af10, count: -14