uvm_fault(fffffd805efcbca0,b3987a4d000,0,2) at uvm_fault+0x272
upageflttrap(ffff80003c5c6c10,b3987a4d000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188
usertrap(ffff80003c5c6c10) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x6fd4d90c9430, 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:437
witness_checkorder(fffffd806e63c740,9,0) at witness_checkorder+0x1047
rw_do_enter_write(fffffd806e63c728,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233
rrw_enter(fffffd806e63c728,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616
VOP_LOCK(fffffd80727eb530,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524
vn_lock(fffffd80727eb530,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vfs_getcwd_common(fffffd80727eb530,fffffd80727eb530,0,0,200,0,ccc12e3ae040a113) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287
vn_isunder(fffffd80727eb530,fffffd80727eb530,ffff80002a49c7c8) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694
unp_externalize(fffffd8078c2ef00,ec,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086
soreceive(ffff8000014c5438,ffff80003c5c0668,ffff80003c5c0618,0,ffff80003c5c0658,ffff80003c5c07dc,206ac64e33fe3032) at soreceive+0xc73 sys/kern/uipc_socket.c:1021
recvit(ffff80002a49c7c8,8,ffff80003c5c07b0,0,ffff80003c5c0860) at recvit+0x40a sys/kern/uipc_syscalls.c:1072
sys_recvmsg(ffff80002a49c7c8,ffff80003c5c0910,ffff80003c5c0860) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872
syscall(ffff80003c5c0910) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c5c0910) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x9d120b9d390, count: -14