uvm_fault(fffffd806c6acd78,a0f00f25000,0,4) at uvm_fault+0x274 sys/uvm/uvm_fault.c:-1
upageflttrap(ffff80003a7c4e60,a0f00f25a50) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003a7c4e60) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7b5502103530, count: -14
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(fffffd807be3d698,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1
rw_do_enter_write(fffffd807be3d680,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234
rrw_enter(fffffd807be3d680,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffffd806aa0c480,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
vn_lock(fffffd806aa0c480,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vfs_getcwd_common(fffffd806aa0c480,fffffd806aa0c990,0,0,200,0,c85c7acbc9fc0db2) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287
vn_isunder(fffffd806aa0c480,fffffd806aa0c990,ffff80003c3edcb8) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694
unp_externalize(fffffd806d66b600,33,0) at unp_externalize+0x26f sys/kern/uipc_usrreq.c:1090
soreceive(ffff8000016b29c8,ffff80003c4056f8,ffff80003c4056a8,0,ffff80003c4056e0,ffff80003c40586c,dbb1985650bd4bf2) at soreceive+0xc24 sys/kern/uipc_socket.c:1029
recvit(ffff80003c3edcb8,7,ffff80003c405840,0,ffff80003c4058f0) at recvit+0x40b sys/kern/uipc_syscalls.c:1078
sys_recvmsg(ffff80003c3edcb8,ffff80003c4059a0,ffff80003c4058f0) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878
syscall(ffff80003c4059a0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c4059a0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xb805699c3d0, count: -14