uvm_fault(fffffd806bdf6020,8c8320c6000,0,4) at uvm_fault+0x272
upageflttrap(ffff8000334c8810,8c8320c6b50) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188
usertrap(ffff8000334c8810) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x72984dea2350, 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(fffffd806744a0a0,9,0) at witness_checkorder+0x1047
rw_do_enter_write(fffffd806744a088,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233
rrw_enter(fffffd806744a088,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616
VOP_LOCK(fffffd8079578e88,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524
vn_lock(fffffd8079578e88,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vfs_getcwd_common(fffffd8079578e88,fffffd8079578e88,0,0,200,0,4f8d3d70f2ccd83f) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287
vn_isunder(fffffd8079578e88,fffffd8079578e88,ffff8000ffff87d0) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694
unp_externalize(fffffd807eb95b00,33,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086
soreceive(ffff800010fdf598,ffff80003c5088a8,ffff80003c508858,0,ffff80003c508898,ffff80003c508a1c,f3eb986f3060f6a5) at soreceive+0xc73 sys/kern/uipc_socket.c:1021
recvit(ffff8000ffff87d0,4,ffff80003c5089f0,0,ffff80003c508aa0) at recvit+0x40a sys/kern/uipc_syscalls.c:1072
sys_recvmsg(ffff8000ffff87d0,ffff80003c508b50,ffff80003c508aa0) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872
syscall(ffff80003c508b50) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c508b50) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x4b139ad5940, count: -14