uvm_fault(fffff3806cd1ab90,40ff870f000,0,4) at uvm_fault+0x274 sys/uvm/uvm_fault.c:-1
upageflttrap(ffff800031791f20,40ff870f0c0) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff800031791f20) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7bea60eb3bc0, 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(fffff38068eb7568,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1
rw_do_enter_write(fffff38068eb7550,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234
rrw_enter(fffff38068eb7550,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffff3805f746490,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
vn_lock(fffff3805f746490,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:576
vfs_getcwd_common(fffff3805f746490,fffff3805f746208,0,0,200,0,b201cad1c4717801) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287
vn_isunder(fffff3805f746490,fffff3805f746208,ffff800039bb9ca8) at vn_isunder+0x56 sys/kern/vfs_vnops.c:700
unp_externalize(fffff3806f8cd300,33,0) at unp_externalize+0x26f sys/kern/uipc_usrreq.c:1090
soreceive(ffff80000163fa90,ffff80003539dbb8,ffff80003539db68,0,ffff80003539dba0,ffff80003539dd2c,4e6a9ebc35c1ae0f) at soreceive+0xc24 sys/kern/uipc_socket.c:1029
recvit(ffff800039bb9ca8,1,ffff80003539dd00,0,ffff80003539ddb0) at recvit+0x40b sys/kern/uipc_syscalls.c:1078
sys_recvmsg(ffff800039bb9ca8,ffff80003539de60,ffff80003539ddb0) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878
syscall(ffff80003539de60) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003539de60) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x73f7fa4dd70, count: -14