list_del corruption. prev->next should be ffff8881cbfe0ff0, but was ffff8881b8c17930 ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:53! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 10530 Comm: syz-executor4 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 RSP: 0018:ffff888186ad6cd0 EFLAGS: 00010282 RAX: 0000000000000054 RBX: ffff8881cbfe0ff0 RCX: ffffc9000de1e000 RDX: 0000000000000000 RSI: ffffffff816621c5 RDI: 0000000000000005 RBP: ffff888186ad6ce8 R08: ffff88818ba344c0 R09: ffffed103b585020 R10: ffffed103b585020 R11: ffff8881dac28107 R12: ffff8881d93f62b0 R13: ffffffff8a1dca60 R14: ffff888186ad6df0 R15: 1ffff11030d5ada6 FS: 00007fb156fcc700(0000) GS:ffff8881dac00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000072c000 CR3: 00000001cda0e000 CR4: 00000000001406f0 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 neigh_flush_dev+0x3a1/0x960 net/core/neighbour.c:290 __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 kobject: 'loop0' (000000004f89ef6a): kobject_uevent_env kobject: 'loop0' (000000004f89ef6a): fill_kobj_path: path = '/devices/virtual/block/loop0' 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_extack net/core/dev.c:1749 [inline] call_netdevice_notifiers net/core/dev.c:1763 [inline] __dev_notify_flags+0x29b/0x480 net/core/dev.c:7595 kobject: 'loop1' (0000000002571322): kobject_uevent_env dev_change_flags+0x109/0x160 net/core/dev.c:7631 dev_ifsioc+0x7d8/0xa80 net/core/dev_ioctl.c:237 kobject: 'loop1' (0000000002571322): fill_kobj_path: path = '/devices/virtual/block/loop1' 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:00007fb156fcbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457679 RDX: 0000000020000000 RSI: 0000000000008914 RDI: 0000000000000003 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb156fcc6d4 R13: 00000000004c2765 R14: 00000000004d4708 R15: 00000000ffffffff Modules linked in: ---[ end trace 1e3f9f72123dbe96 ]--- 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:ffff888186ad6cd0 EFLAGS: 00010282 RAX: 0000000000000054 RBX: ffff8881cbfe0ff0 RCX: ffffc9000de1e000 RDX: 0000000000000000 RSI: ffffffff816621c5 RDI: 0000000000000005 RBP: ffff888186ad6ce8 R08: ffff88818ba344c0 R09: ffffed103b585020 R10: ffffed103b585020 R11: ffff8881dac28107 R12: ffff8881d93f62b0 R13: ffffffff8a1dca60 R14: ffff888186ad6df0 R15: 1ffff11030d5ada6 FS: 00007fb156fcc700(0000) GS:ffff8881dac00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000072c000 CR3: 00000001cda0e000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400