list_add corruption. prev->next should be next (ffffffff8a1dca60), but was ffff8881d893e6f0. (prev=ffff8881d8b6bd70). ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:28! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 7559 Comm: syz-executor5 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+0x23/0x2a lib/list_debug.c:26 Code: 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 90 90 90 90 90 55 48 89 e5 41 57 41 56 49 be 00 00 00 00 00 kobject: 'loop0' (00000000ad38b4fb): kobject_uevent_env RSP: 0018:ffff8881dac06dc0 EFLAGS: 00010286 RAX: 0000000000000075 RBX: ffffffff8a1dca60 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff816621c5 RDI: 0000000000000005 RBP: ffff8881dac06dd8 R08: ffff888185f70500 R09: ffffed103b585020 R10: ffffed103b585020 R11: ffff8881dac28107 R12: ffff8881c2052730 R13: ffff8881c20524c0 R14: ffffffff8a1dc820 R15: ffffffff8a1dcab0 kobject: 'loop0' (00000000ad38b4fb): fill_kobj_path: path = '/devices/virtual/block/loop0' FS: 0000000001566940(0000) GS:ffff8881dac00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000063f210 CR3: 00000001b8ddf000 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] mld_sendpack+0xad5/0xfa0 net/ipv6/mcast.c:1683 mld_send_cr net/ipv6/mcast.c:1979 [inline] mld_ifc_timer_expire+0x447/0x8a0 net/ipv6/mcast.c:2478 call_timer_fn+0x272/0x920 kernel/time/timer.c:1325 kobject: 'loop2' (000000008d97b115): kobject_uevent_env kobject: 'loop2' (000000008d97b115): fill_kobj_path: path = '/devices/virtual/block/loop2' 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 kobject: 'loop3' (00000000dd3e2321): kobject_uevent_env kobject: 'loop3' (00000000dd3e2321): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (000000008d97b115): kobject_uevent_env apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 kobject: 'loop2' (000000008d97b115): fill_kobj_path: path = '/devices/virtual/block/loop2' RIP: 0010:PageCompound include/linux/page-flags.h:157 [inline] RIP: 0010:PageHuge+0x9c/0x2b0 mm/hugetlb.c:1339 Code: 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 e8 ec 1f c1 ff 4c 89 e8 48 c1 e8 03 42 80 3c 20 00 0f 85 c2 01 00 00 4d 8b 65 00 31 ff <49> c1 ec 10 41 83 e4 01 4c 89 e6 e8 f4 20 c1 ff 4d 85 e4 0f 84 12 RSP: 0018:ffff888186f9ea00 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffffd4000e2fb28 RBX: 1ffff11030df3d41 RCX: 1ffff11030df3d34 RDX: 0000000000000000 RSI: ffffffff81bed824 RDI: 0000000000000000 kobject: 'loop3' (00000000dd3e2321): kobject_uevent_env RBP: ffff888186f9ead0 R08: ffffed103b585b60 R09: ffffed103b585b5f R10: ffffed103b585b5f R11: ffff8881dac2dafb R12: 02fffc0000000000 R13: ffffea000717d940 R14: ffff888186f9eaa8 R15: 0000000000000000 kobject: 'loop3' (00000000dd3e2321): fill_kobj_path: path = '/devices/virtual/block/loop3' page_remove_file_rmap mm/rmap.c:1222 [inline] page_remove_rmap+0x85d/0x1a30 mm/rmap.c:1304 kobject: 'loop3' (00000000dd3e2321): kobject_uevent_env kobject: 'loop3' (00000000dd3e2321): fill_kobj_path: path = '/devices/virtual/block/loop3' zap_pte_range mm/memory.c:1092 [inline] zap_pmd_range mm/memory.c:1194 [inline] zap_pud_range mm/memory.c:1223 [inline] zap_p4d_range mm/memory.c:1244 [inline] unmap_page_range+0x11c7/0x2930 mm/memory.c:1265 unmap_single_vma+0x19b/0x310 mm/memory.c:1310 kobject: 'loop4' (0000000068bfe3ba): kobject_uevent_env unmap_vmas+0x252/0x3d0 mm/memory.c:1345 kobject: 'loop4' (0000000068bfe3ba): fill_kobj_path: path = '/devices/virtual/block/loop4' exit_mmap+0x2be/0x590 mm/mmap.c:3129 __mmput kernel/fork.c:1041 [inline] mmput+0x247/0x610 kernel/fork.c:1062 exec_mmap fs/exec.c:1046 [inline] flush_old_exec+0xb91/0x21a0 fs/exec.c:1279 load_elf_binary+0xa39/0x5620 fs/binfmt_elf.c:869 search_binary_handler+0x17d/0x570 fs/exec.c:1656 exec_binprm fs/exec.c:1698 [inline] __do_execve_file.isra.35+0x178c/0x2760 fs/exec.c:1818 do_execveat_common fs/exec.c:1865 [inline] do_execve fs/exec.c:1882 [inline] __do_sys_execve fs/exec.c:1963 [inline] __se_sys_execve fs/exec.c:1958 [inline] __x64_sys_execve+0x8f/0xc0 fs/exec.c:1958 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455f07 Code: Bad RIP value. RSP: 002b:00007ffd1c9d74a8 EFLAGS: 00000207 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000455f07 RDX: 00007ffd1c9d7ba8 RSI: 00007ffd1c9d74e0 RDI: 00000000004dca5b RBP: 00007ffd1c9d7660 R08: 0000000000000000 R09: 0000000000000039 R10: 0000000000000008 R11: 0000000000000207 R12: 00007ffd1c9d78d8 R13: 00007ffd1c9d7808 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 963f310cad6fd94e ]--- RIP: 0010:__list_add_valid.cold.2+0x23/0x2a lib/list_debug.c:26 Code: 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 90 90 90 90 90 55 48 89 e5 41 57 41 56 49 be 00 00 00 00 00 RSP: 0018:ffff8881dac06dc0 EFLAGS: 00010286 RAX: 0000000000000075 RBX: ffffffff8a1dca60 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff816621c5 RDI: 0000000000000005 RBP: ffff8881dac06dd8 R08: ffff888185f70500 R09: ffffed103b585020 R10: ffffed103b585020 R11: ffff8881dac28107 R12: ffff8881c2052730 R13: ffff8881c20524c0 R14: ffffffff8a1dc820 R15: ffffffff8a1dcab0 FS: 0000000001566940(0000) GS:ffff8881dac00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000455edd CR3: 00000001b8ddf000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400