[Crash-utility] Crash fails to analyse kernel dump from 4.2-rc4

Hi all, I updated my kernel to 4.2-rc4 but suddenly crash failed to analyse the kernel with the following error message: ------ crash: invalid kernel virtual address: 170000001d type: "possible" WARNING: cannot read cpu_possible_map crash: invalid kernel virtual address: 3800000046 type: "present" WARNING: cannot read cpu_present_map crash: invalid kernel virtual address: 240000002d type: "online" WARNING: cannot read cpu_online_map crash: invalid kernel virtual address: 570000006e type: "active" WARNING: cannot read cpu_active_map crash: cannot determine base kernel version crash: /home/adam/linux-btrfs/vmlinux and vmcore do not match! ------ Crash 7.1.0 and 7.1.2 fails with the same error. Previously I'm testing 4.2-rc1 kernel and 7.1.0 works like a charm. So is there something wrong with the new kernel? Thanks, Qu