FYI, we noticed the following commit: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master commit 2647cffb2bc6fbed163d377390eb7ca552c7c1cb ("net: ipconfig: Support using "delayed" DHCP replies") in testcase: boot on test machine: 1 threads qemu-system-x86_64 -enable-kvm -cpu Nehalem with 1G memory caused below changes: +------------------------------------------+------------+------------+ | | 22fc538872 | 2647cffb2b | +------------------------------------------+------------+------------+ | boot_successes | 8 | 0 | | boot_failures | 0 | 6 | | general_protection_fault:#[##]SMP | 0 | 6 | | RIP:strcpy | 0 | 6 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 6 | | backtrace:kernel_init_freeable | 0 | 6 | | backtrace:ret_from_fork | 0 | 6 | +------------------------------------------+------------+------------+ [ 89.061170] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready [ 89.072165] Sending DHCP requests ., OK [ 89.075534] IP-Config: Got DHCP answer from 10.0.2.2, my address is 10.0.2.15 [ 89.078223] general protection fault: 0000 [#1] SMP [ 89.080170] Modules linked in: [ 89.081918] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.7.0-11592-g2647cff #11 [ 89.085318] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014 [ 89.089047] task: ffff8800365c0040 task.stack: ffff8800365c8000 [ 89.091327] RIP: 0010:[] [] strcpy+0x9/0x18 [ 89.094885] RSP: 0018:ffff8800365cbde0 EFLAGS: 00010246 [ 89.097006] RAX: ffff8800365cbe20 RBX: ffff8800365cbe20 RCX: 0000000000000000 [ 89.099452] RDX: 0000000000000000 RSI: 6b6b6b6b6b6b6b6b RDI: ffff8800365cbe20 [ 89.102012] RBP: ffff8800365cbde0 R08: 0000002ba39efe42 R09: 0000000000000001 [ 89.104605] R10: ffff8800365cbd98 R11: ffffffff811ee48d R12: 00000000fffcc43d [ 89.107155] R13: ffff88001d7ea160 R14: ffff8800365c0040 R15: ffff88003d47a650 [ 89.109772] FS: 0000000000000000(0000) GS:ffff880038800000(0000) knlGS:0000000000000000 [ 89.113338] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 89.115610] CR2: 0000000000000000 CR3: 0000000002418000 CR4: 00000000000006f0 [ 89.118156] Stack: [ 89.119552] ffff8800365cbe80 ffffffff82826801 0000000000000000 ffffffff824aad80 [ 89.123531] 0000000000000002 00000000fffcb9b1 0000000100000006 0000000100000002 [ 89.127474] 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 89.131510] Call Trace: [ 89.133014] [] ip_auto_config+0xb79/0xe2e [ 89.135395] [] ? set_debug_rodata+0x12/0x12 [ 89.137629] [] ? ip_auto_config+0xe2e/0xe2e [ 89.140026] [] ? set_debug_rodata+0x12/0x12 [ 89.142296] [] ip_auto_config+0x35/0x37 [ 89.144578] [] ? ip_auto_config+0x35/0x37 [ 89.146849] [] do_one_initcall+0x90/0x123 [ 89.149119] [] ? set_debug_rodata+0x12/0x12 [ 89.151399] [] kernel_init_freeable+0x1cf/0x257 [ 89.153721] [] kernel_init+0xe/0xf5 [ 89.155845] [] ret_from_fork+0x1f/0x40 [ 89.157910] [] ? rest_init+0x13b/0x13b [ 89.160079] Code: c2 43 f6 04 10 01 4c 89 d2 0f b6 c0 41 0f 45 d1 48 ff c1 0f b6 d2 39 d0 75 04 85 c0 75 c6 29 d0 5d c3 55 48 89 f8 31 d2 48 89 e5 <8a> 0c 16 88 0c 10 48 ff c2 84 c9 75 f3 5d c3 55 48 89 f8 31 c9 [ 89.175614] RIP [] strcpy+0x9/0x18 [ 89.177856] RSP [ 89.179687] ---[ end trace 76289f54f362e73f ]--- [ 89.181690] Kernel panic - not syncing: Fatal exception FYI, raw QEMU command line is: qemu-system-x86_64 -enable-kvm -cpu Nehalem -kernel /pkg/linux/x86_64-nfsroot/gcc-6/2647cffb2bc6fbed163d377390eb7ca552c7c1cb/vmlinuz-4.7.0-11592-g2647cff -append 'ip=::::vm-intel12-1G-1::dhcp root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-intel12-1G-1/boot-1-debian-x86_64-2015-02-07.cgz-2647cffb2bc6fbed163d377390eb7ca552c7c1cb-20160809-29283-1s4umfr-0.yaml ARCH=x86_64 kconfig=x86_64-nfsroot branch=linux-devel/devel-catchup-201608091320 commit=2647cffb2bc6fbed163d377390eb7ca552c7c1cb BOOT_IMAGE=/pkg/linux/x86_64-nfsroot/gcc-6/2647cffb2bc6fbed163d377390eb7ca552c7c1cb/vmlinuz-4.7.0-11592-g2647cff max_uptime=600 RESULT_ROOT=/result/boot/1/vm-intel12-1G/debian-x86_64-2015-02-07.cgz/x86_64-nfsroot/gcc-6/2647cffb2bc6fbed163d377390eb7ca552c7c1cb/0 LKP_SERVER=inn debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 systemd.log_level=err ignore_loglevel earlyprintk=ttyS0,115200 console=ttyS0,115200 console=tty0 vga=normal rw' -initrd /fs/KVM/initrd-vm-intel12-1G-1 -m 1024 -smp 1 -device e1000,netdev=net0 -netdev user,id=net0,hostfwd=tcp::23300-:22 -boot order=nc -no-reboot -watchdog i6300esb -watchdog-action debug -rtc base=localtime -drive file=/fs/KVM/disk0-vm-intel12-1G-1,media=disk,if=virtio -drive file=/fs/KVM/disk1-vm-intel12-1G-1,media=disk,if=virtio -drive file=/fs/KVM/disk2-vm-intel12-1G-1,media=disk,if=virtio -drive file=/fs/KVM/disk3-vm-intel12-1G-1,media=disk,if=virtio -drive file=/fs/KVM/disk4-vm-intel12-1G-1,media=disk,if=virtio -drive file=/fs/KVM/disk5-vm-intel12-1G-1,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-vm-intel12-1G-1 -serial file:/dev/shm/kboot/serial-vm-intel12-1G-1 -daemonize -display none -monitor null Thanks, Xiaolong