list_add corruption. next->prev should be prev (ffff8881c0e01d70), but was ffff8881b87302b0. (next=ffffffff8a1dca60). ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:25! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 12529 Comm: blkid 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 kobject: 'loop1' (000000002f6b5f17): kobject_uevent_env 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:ffff8881dac06ce0 EFLAGS: 00010286 RAX: 0000000000000075 RBX: ffffffff8a1dca60 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff816621c5 RDI: 0000000000000005 RBP: ffff8881dac06cf8 R08: ffff8881d7132300 R09: ffffed103b585020 R10: ffffed103b585020 R11: ffff8881dac28107 R12: ffff8881d18b3030 R13: ffff8881d18b2dc0 R14: ffffffff8a1dc820 R15: ffffffff8a1dcab0 FS: 00007fb07921b740(0000) GS:ffff8881dac00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff2a4985518 CR3: 00000001a135f000 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 kobject: 'loop1' (000000002f6b5f17): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (000000000f58bfd2): kobject_uevent_env kobject: 'loop3' (000000000f58bfd2): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (000000006310fb23): kobject_uevent_env kobject: 'loop0' (000000006310fb23): fill_kobj_path: path = '/devices/virtual/block/loop0' __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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:766 [inline] RIP: 0010:kmem_cache_free+0x1ec/0x290 mm/slab.c:3748 Code: 3d 7e 0f 85 f4 fe ff ff e8 a0 71 3c ff e9 ea fe ff ff e8 07 26 c2 ff 48 83 3d 0f 35 ae 07 00 0f 84 9d 00 00 00 4c 89 ef 57 9d <0f> 1f 44 00 00 e9 bf fe ff ff 48 63 73 74 4c 89 e7 e8 4e 25 d0 01 RSP: 0018:ffff888195ac73c8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffff8881da970480 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000282 RBP: ffff888195ac73e8 R08: ffff8881d7132300 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881d8154150 R13: 0000000000000282 R14: ffffffff81b9b590 R15: ffff8881d7ea64c8 anon_vma_chain_free mm/rmap.c:134 [inline] unlink_anon_vmas+0x5f0/0xa60 mm/rmap.c:419 free_pgtables+0x271/0x380 mm/memory.c:393 exit_mmap+0x2cd/0x590 mm/mmap.c:3130 __mmput kernel/fork.c:1041 [inline] mmput+0x247/0x610 kernel/fork.c:1062 exit_mm kernel/exit.c:545 [inline] do_exit+0xdeb/0x2620 kernel/exit.c:854 do_group_exit+0x177/0x440 kernel/exit.c:970 __do_sys_exit_group kernel/exit.c:981 [inline] __se_sys_exit_group kernel/exit.c:979 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:979 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fb078aff1e8 Code: Bad RIP value. RSP: 002b:00007ffe0d495d78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fb078aff1e8 RDX: 0000000000000002 RSI: 000000000000003c RDI: 0000000000000002 RBP: 00007fb078dd4840 R08: 00000000000000e7 R09: ffffffffffffffa8 R10: 00007fb078dda740 R11: 0000000000000246 R12: 00007fb078dd4840 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace c0c8b8a109731894 ]--- 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:ffff8881dac06ce0 EFLAGS: 00010286 RAX: 0000000000000075 RBX: ffffffff8a1dca60 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff816621c5 RDI: 0000000000000005 RBP: ffff8881dac06cf8 R08: ffff8881d7132300 R09: ffffed103b585020 R10: ffffed103b585020 R11: ffff8881dac28107 R12: ffff8881d18b3030 R13: ffff8881d18b2dc0 R14: ffffffff8a1dc820 R15: ffffffff8a1dcab0 FS: 00007fb07921b740(0000) GS:ffff8881dac00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb078aff1be CR3: 00000001a135f000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400