list_del corruption. prev->next should be ffff8881c2ec3d70, but was ffff8881c492ddb0 ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:53! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 9370 Comm: syz-executor0 Not tainted 4.20.0-rc6-next-20181210+ #164 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_del_entry_valid.cold.1+0x48/0x4a lib/list_debug.c:51 Code: e4 80 88 e8 22 1f d2 fd 0f 0b 48 89 de 48 c7 c7 c0 e5 80 88 e8 11 1f d2 fd 0f 0b 48 89 de 48 c7 c7 60 e5 80 88 e8 00 1f d2 fd <0f> 0b 48 89 d9 48 c7 c7 20 e6 80 88 e8 ef 1e d2 fd 0f 0b 48 89 f1 kobject: 'loop3' (00000000443bca0e): kobject_uevent_env RSP: 0018:ffff8881b953ec60 EFLAGS: 00010282 RAX: 0000000000000054 RBX: ffff8881c2ec3d70 RCX: ffffc900061c0000 RDX: 0000000000000000 RSI: ffffffff816621c5 RDI: 0000000000000005 RBP: ffff8881b953ec78 R08: ffff8881c1088340 R09: ffffed103b5a5020 R10: ffffed103b5a5020 R11: ffff8881dad28107 R12: ffff8881d85dcff0 R13: ffff8881c712b470 R14: ffff8881b953ed80 R15: 1ffff110372a7d98 FS: 00007fc39db65700(0000) GS:ffff8881dad00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kobject: 'loop3' (00000000443bca0e): fill_kobj_path: path = '/devices/virtual/block/loop3' CR2: 0000000000625208 CR3: 00000001bcd80000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry include/linux/list.h:117 [inline] list_del_init include/linux/list.h:159 [inline] neigh_mark_dead+0x13b/0x410 net/core/neighbour.c:125 kobject: 'loop5' (00000000704ab802): kobject_uevent_env kobject: 'loop5' (00000000704ab802): fill_kobj_path: path = '/devices/virtual/block/loop5' neigh_flush_dev+0x3a1/0x960 net/core/neighbour.c:290 kobject: 'loop3' (00000000443bca0e): kobject_uevent_env kobject: 'loop3' (00000000443bca0e): fill_kobj_path: path = '/devices/virtual/block/loop3' __neigh_ifdown+0x44/0x2c0 net/core/neighbour.c:328 neigh_ifdown+0x1f/0x30 net/core/neighbour.c:345 rt6_disable_ip+0x5b8/0x720 net/ipv6/route.c:4046 addrconf_ifdown+0x168/0x1650 net/ipv6/addrconf.c:3669 addrconf_notify+0x6de/0x2770 net/ipv6/addrconf.c:3594 notifier_call_chain+0x17e/0x380 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1737 call_netdevice_notifiers_mtu net/core/dev.c:1786 [inline] dev_set_mtu_ext+0x47f/0x7a0 net/core/dev.c:7687 dev_set_mtu+0x96/0x140 net/core/dev.c:7708 dev_ifsioc+0x8de/0xa80 net/core/dev_ioctl.c:244 dev_ioctl+0x1b5/0xcc0 net/core/dev_ioctl.c:488 sock_do_ioctl+0x1f6/0x420 net/socket.c:974 sock_ioctl+0x313/0x690 net/socket.c:1075 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x1de/0x1790 fs/ioctl.c:696 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457679 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fc39db64c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457679 RDX: 0000000020000040 RSI: 0000000000008922 RDI: 0000000000000005 RBP: 000000000072c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc39db656d4 R13: 00000000004c1191 R14: 00000000004d24a0 R15: 00000000ffffffff Modules linked in: ---[ end trace 46f7a273b14b655e ]--- RIP: 0010:__list_del_entry_valid.cold.1+0x48/0x4a lib/list_debug.c:51 Code: e4 80 88 e8 22 1f d2 fd 0f 0b 48 89 de 48 c7 c7 c0 e5 80 88 e8 11 1f d2 fd 0f 0b 48 89 de 48 c7 c7 60 e5 80 88 e8 00 1f d2 fd <0f> 0b 48 89 d9 48 c7 c7 20 e6 80 88 e8 ef 1e d2 fd 0f 0b 48 89 f1 RSP: 0018:ffff8881b953ec60 EFLAGS: 00010282 RAX: 0000000000000054 RBX: ffff8881c2ec3d70 RCX: ffffc900061c0000 RDX: 0000000000000000 RSI: ffffffff816621c5 RDI: 0000000000000005 RBP: ffff8881b953ec78 R08: ffff8881c1088340 R09: ffffed103b5a5020 R10: ffffed103b5a5020 R11: ffff8881dad28107 R12: ffff8881d85dcff0 R13: ffff8881c712b470 R14: ffff8881b953ed80 R15: 1ffff110372a7d98 FS: 00007fc39db65700(0000) GS:ffff8881dad00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000625208 CR3: 00000001bcd80000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400