list_add corruption. prev->next should be next (ffffffff89fd1320), but was ffff8881bcf962b0. (prev=ffff8881bd2ae270). ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:28! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 7585 Comm: syz-executor5 Not tainted 4.20.0-rc6+ #337 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_add_valid.cold.2+0x23/0x2a lib/list_debug.c:26 Code: e8 d0 6e d2 fd 0f 0b 48 89 d9 48 c7 c7 e0 da 60 88 e8 bf 6e d2 fd 0f 0b 48 89 f1 48 c7 c7 60 db 60 88 48 89 de e8 ab 6e d2 fd <0f> 0b 90 90 90 90 90 55 48 89 e5 41 57 41 56 49 be 00 00 00 00 00 RSP: 0018:ffff8881dae06ce0 EFLAGS: 00010286 RAX: 0000000000000075 RBX: ffffffff89fd1320 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8165e485 RDI: 0000000000000005 RBP: ffff8881dae06cf8 R08: ffff888195c3e280 R09: ffffed103b5c5020 R10: ffffed103b5c5020 R11: ffff8881dae28107 R12: ffff8881b6bb62b0 R13: ffff8881b6bb6040 R14: ffffffff89fd10e0 R15: ffffffff89fd1370 kobject: 'loop4' (0000000054f2451c): kobject_uevent_env FS: 0000000000000000(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004dca3b CR3: 00000001c5e36000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 kobject: 'loop4' (0000000054f2451c): fill_kobj_path: path = '/devices/virtual/block/loop4' DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> __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:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers+0x7e5/0xc70 kernel/time/timer.c:1682 run_timer_softirq+0x52/0xb0 kernel/time/timer.c:1695 __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 </IRQ> RIP: 0010:PageSlab include/linux/page-flags.h:294 [inline] RIP: 0010:page_mapcount+0x130/0x5d0 include/linux/mm.h:631 Code: 89 d6 48 89 95 b0 fe ff ff e8 dc bc cd ff 48 8b 95 b0 fe ff ff 48 8b 85 a8 fe ff ff 48 85 d2 0f 85 6e 03 00 00 e8 90 bb cd ff <4c> 89 f2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f RSP: 0018:ffff8881987fed80 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff888195c3e280 RBX: ffffea0007044540 RCX: ffffffff81b1c8b4 RDX: 0000000000000000 RSI: ffffffff81b1c8d0 RDI: 0000000000000007 RBP: ffff8881987feed8 R08: ffff888195c3e280 R09: ffffed103b5c5b5f R10: 0000000000000003 R11: ffff8881dae2dafb R12: 1ffff110330ffdb2 R13: ffff8881987feeb0 R14: ffffea0007044540 R15: ffffea0007044548 zap_pte_range mm/memory.c:1092 [inline] zap_pmd_range mm/memory.c:1193 [inline] zap_pud_range mm/memory.c:1222 [inline] zap_p4d_range mm/memory.c:1243 [inline] unmap_page_range+0x11cf/0x2930 mm/memory.c:1264 unmap_single_vma+0x19b/0x310 mm/memory.c:1309 unmap_vmas+0x125/0x200 mm/memory.c:1339 exit_mmap+0x2be/0x590 mm/mmap.c:3145 __mmput kernel/fork.c:1045 [inline] mmput+0x247/0x610 kernel/fork.c:1066 exec_mmap fs/exec.c:1043 [inline] flush_old_exec+0xb91/0x21b0 fs/exec.c:1276 load_elf_binary+0xa39/0x5620 fs/binfmt_elf.c:869 search_binary_handler+0x17d/0x570 fs/exec.c:1653 exec_binprm fs/exec.c:1695 [inline] __do_execve_file.isra.33+0x1661/0x25d0 fs/exec.c:1819 do_execveat_common fs/exec.c:1866 [inline] do_execve fs/exec.c:1883 [inline] __do_sys_execve fs/exec.c:1964 [inline] __se_sys_execve fs/exec.c:1959 [inline] __x64_sys_execve+0x8f/0xc0 fs/exec.c:1959 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455ee7 Code: Bad RIP value. RSP: 002b:00007ffd78b32de8 EFLAGS: 00000207 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000455ee7 RDX: 00007ffd78b334e8 RSI: 00007ffd78b32e20 RDI: 00000000004dca3b RBP: 00007ffd78b32fa0 R08: 0000000000000000 R09: 0000000000000037 R10: 0000000000000008 R11: 0000000000000207 R12: 00007ffd78b33228 R13: 00007ffd78b33148 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace bb9ac8147c4f1f22 ]--- RIP: 0010:__list_add_valid.cold.2+0x23/0x2a lib/list_debug.c:26 Code: e8 d0 6e d2 fd 0f 0b 48 89 d9 48 c7 c7 e0 da 60 88 e8 bf 6e d2 fd 0f 0b 48 89 f1 48 c7 c7 60 db 60 88 48 89 de e8 ab 6e d2 fd <0f> 0b 90 90 90 90 90 55 48 89 e5 41 57 41 56 49 be 00 00 00 00 00 RSP: 0018:ffff8881dae06ce0 EFLAGS: 00010286 RAX: 0000000000000075 RBX: ffffffff89fd1320 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8165e485 RDI: 0000000000000005 RBP: ffff8881dae06cf8 R08: ffff888195c3e280 R09: ffffed103b5c5020 R10: ffffed103b5c5020 R11: ffff8881dae28107 R12: ffff8881b6bb62b0 R13: ffff8881b6bb6040 R14: ffffffff89fd10e0 R15: ffffffff89fd1370 FS: 0000000000000000(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000455ebd CR3: 00000001c5e36000 CR4: 00000000001406f0 kobject: 'loop4' (0000000054f2451c): kobject_uevent_env DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 kobject: 'loop4' (0000000054f2451c): fill_kobj_path: path = '/devices/virtual/block/loop4' DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400