list_add corruption. next->prev should be prev (ffff8881baf92bb0), but was ffff8881d460cff0. (next=ffffffff8a1dca60). ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:25! invalid opcode: 0000 [#1] PREEMPT SMP KASAN kobject: 'loop1' (0000000071082dab): kobject_uevent_env CPU: 1 PID: 6188 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_add_valid.cold.2+0xf/0x2a lib/list_debug.c:23 Code: 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 48 c7 c7 a0 e6 80 88 48 89 de e8 db 1e d2 fd 0f 0b kobject: 'loop1' (0000000071082dab): fill_kobj_path: path = '/devices/virtual/block/loop1' RSP: 0018:ffff8881dad06ce0 EFLAGS: 00010286 RAX: 0000000000000075 RBX: ffffffff8a1dca60 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff816621c5 RDI: 0000000000000005 RBP: ffff8881dad06cf8 R08: ffff88818ffd2340 R09: ffffed103b5a5020 R10: ffffed103b5a5020 R11: ffff8881dad28107 R12: ffff8881bb8de6f0 R13: ffff8881bb8de480 R14: ffffffff8a1dc820 R15: ffffffff8a1dcab0 FS: 000000000198c940(0000) GS:ffff8881dad00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000a40021 CR3: 000000018ffa8000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_add include/linux/list.h:60 [inline] list_add_tail include/linux/list.h:93 [inline] neigh_alloc net/core/neighbour.c:395 [inline] ___neigh_create+0x14b7/0x2600 net/core/neighbour.c:553 kernel msg: ebtables bug: please report to author: Wrong nr of counters __neigh_create+0x30/0x40 net/core/neighbour.c:640 ip6_finish_output2+0xa64/0x2940 net/ipv6/ip6_output.c:117 netlink: 'syz-executor3': attribute type 1 has an invalid length. ip6_finish_output+0x58c/0xc60 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip6_output+0x232/0x9d0 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:444 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] ndisc_send_skb+0x1005/0x1560 net/ipv6/ndisc.c:491 ndisc_send_rs+0x134/0x6e0 net/ipv6/ndisc.c:685 addrconf_rs_timer+0x314/0x690 net/ipv6/addrconf.c:3840 call_timer_fn+0x272/0x920 kernel/time/timer.c:1325 expire_timers kernel/time/timer.c:1362 [inline] __run_timers+0x7e5/0xc70 kernel/time/timer.c:1681 run_timer_softirq+0x52/0xb0 kernel/time/timer.c:1694 __do_softirq+0x308/0xb7e kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x17f/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1cb/0x760 arch/x86/kernel/apic/apic.c:1061 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:766 [inline] RIP: 0010:lock_acquire+0x268/0x520 kernel/locking/lockdep.c:3847 Code: 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 44 02 00 00 48 83 3d f7 2d 10 08 00 0f 84 c3 01 00 00 48 8b bd 20 ff ff ff 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 RSP: 0018:ffff88818ffded38 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff11031ffbdac RCX: 0000000000000000 RDX: 1ffffffff12e4816 RSI: 0000000000000000 RDI: 0000000000000282 RBP: ffff88818ffdee28 R08: ffff88818ffd2c58 R09: 0000000000000008 R10: 00000000000009e7 R11: ffff88818ffd2340 R12: ffff88818ffd2340 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 down_write+0x8a/0x130 kernel/locking/rwsem.c:70 i_mmap_lock_write include/linux/fs.h:511 [inline] dup_mmap kernel/fork.c:547 [inline] dup_mm kernel/fork.c:1314 [inline] copy_mm kernel/fork.c:1369 [inline] copy_process+0x43b7/0x87a0 kernel/fork.c:1913 _do_fork+0x1cb/0x11d0 kernel/fork.c:2212 __do_sys_clone kernel/fork.c:2319 [inline] __se_sys_clone kernel/fork.c:2313 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2313 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455c2a Code: f7 d8 64 89 04 25 d4 02 00 00 64 4c 8b 0c 25 10 00 00 00 31 d2 4d 8d 91 d0 02 00 00 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 f5 00 00 00 85 c0 41 89 c5 0f 85 fc 00 00 RSP: 002b:00007ffea5d04570 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffea5d04570 RCX: 0000000000455c2a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffea5d045b0 R08: 0000000000000001 R09: 000000000198c940 R10: 000000000198cc10 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000004 Modules linked in: ---[ end trace f9af65c262b67c61 ]--- RIP: 0010:__list_add_valid.cold.2+0xf/0x2a lib/list_debug.c:23 Code: 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 48 c7 c7 a0 e6 80 88 48 89 de e8 db 1e d2 fd 0f 0b RSP: 0018:ffff8881dad06ce0 EFLAGS: 00010286 RAX: 0000000000000075 RBX: ffffffff8a1dca60 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff816621c5 RDI: 0000000000000005 RBP: ffff8881dad06cf8 R08: ffff88818ffd2340 R09: ffffed103b5a5020 R10: ffffed103b5a5020 R11: ffff8881dad28107 R12: ffff8881bb8de6f0 kobject: 'loop3' (0000000064f6498f): kobject_uevent_env R13: ffff8881bb8de480 R14: ffffffff8a1dc820 R15: ffffffff8a1dcab0 FS: 000000000198c940(0000) GS:ffff8881dad00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000a40021 CR3: 000000018ffa8000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 kobject: 'loop3' (0000000064f6498f): fill_kobj_path: path = '/devices/virtual/block/loop3'