list_add corruption. next->prev should be prev (ffff8881ba6722b0), but was ffff8881b80df470. (next=ffffffff8a1dca60). ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:25! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 6092 Comm: syz-executor3 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: 'loop0' (00000000c57956ea): kobject_uevent_env RSP: 0018:ffff8881dac06ce0 EFLAGS: 00010286 RAX: 0000000000000075 RBX: ffffffff8a1dca60 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff816621c5 RDI: 0000000000000005 RBP: ffff8881dac06cf8 R08: ffff8881bff56300 R09: ffffed103b585020 R10: ffffed103b585020 R11: ffff8881dac28107 R12: ffff8881bf4ef470 R13: ffff8881bf4ef200 R14: ffffffff8a1dc820 R15: ffffffff8a1dcab0 FS: 0000000000b9a940(0000) GS:ffff8881dac00000(0000) knlGS:0000000000000000 kobject: 'loop0' (00000000c57956ea): fill_kobj_path: path = '/devices/virtual/block/loop0' CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000a40021 CR3: 00000001bf82c000 CR4: 00000000001406f0 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 __neigh_create+0x30/0x40 net/core/neighbour.c:640 ip6_finish_output2+0xa64/0x2940 net/ipv6/ip6_output.c:117 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:__read_once_size include/linux/compiler.h:182 [inline] RIP: 0010:compound_head include/linux/page-flags.h:143 [inline] RIP: 0010:get_page include/linux/mm.h:1005 [inline] RIP: 0010:copy_one_pte mm/memory.c:793 [inline] RIP: 0010:copy_pte_range mm/memory.c:855 [inline] RIP: 0010:copy_pmd_range mm/memory.c:906 [inline] RIP: 0010:copy_pud_range mm/memory.c:940 [inline] RIP: 0010:copy_p4d_range mm/memory.c:962 [inline] RIP: 0010:copy_page_range+0x14ec/0x3050 mm/memory.c:1025 Code: e8 d9 a1 cb ff 4c 8d ad 58 fe ff ff 4c 89 e8 48 c1 e8 03 c6 04 18 00 49 8d 47 08 48 89 85 38 fa ff ff 48 c1 e8 03 80 3c 18 00 <0f> 85 55 1a 00 00 4c 89 ea 49 8b 47 08 48 c1 ea 03 80 3c 1a 00 0f RSP: 0018:ffff8881bff5e898 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffffd4000da1a51 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81b45637 RDI: 0000000000000006 RBP: ffff8881bff5eec0 R08: ffff8881bff56300 R09: fffff94000e1f246 R10: fffff94000e1f246 R11: ffffea00070f9233 R12: 0000000000000008 R13: ffff8881bff5ed18 R14: 0000000000000008 R15: ffffea0006d0d280 dup_mmap kernel/fork.c:580 [inline] dup_mm kernel/fork.c:1314 [inline] copy_mm kernel/fork.c:1369 [inline] copy_process+0x45ea/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:00007ffc7bcb9450 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffc7bcb9450 RCX: 0000000000455c2a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffc7bcb9490 R08: 0000000000000001 R09: 0000000000b9a940 R10: 0000000000b9ac10 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003 Modules linked in: ---[ end trace b8c8ec1221da1329 ]--- 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: 'loop2' (00000000016bd03f): kobject_uevent_env RSP: 0018:ffff8881dac06ce0 EFLAGS: 00010286 kobject: 'loop2' (00000000016bd03f): fill_kobj_path: path = '/devices/virtual/block/loop2' RAX: 0000000000000075 RBX: ffffffff8a1dca60 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff816621c5 RDI: 0000000000000005 RBP: ffff8881dac06cf8 R08: ffff8881bff56300 R09: ffffed103b585020 R10: ffffed103b585020 R11: ffff8881dac28107 R12: ffff8881bf4ef470 R13: ffff8881bf4ef200 R14: ffffffff8a1dc820 R15: ffffffff8a1dcab0 FS: 0000000000b9a940(0000) GS:ffff8881dac00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000a40021 CR3: 00000001bf82c000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400