================================================================== BUG: KASAN: slab-out-of-bounds in find_first_bit+0xf7/0x100 lib/find_bit.c:107 ------------[ cut here ]------------ Read of size 8 at addr ffff8801d687a390 by task kswapd0/1531 kernel BUG at mm/vmscan.c:593! invalid opcode: 0000 [#1] SMP KASAN CPU: 1 PID: 1531 Comm: kswapd0 Not tainted 4.18.0-rc3-next-20180709+ #2 CPU: 0 PID: 12502 Comm: syz-executor5 Not tainted 4.18.0-rc3-next-20180709+ #2 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: RIP: 0010:shrink_slab_memcg mm/vmscan.c:593 [inline] RIP: 0010:shrink_slab+0xb3e/0xdb0 mm/vmscan.c:672 __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 Code: 8d a8 fd ff ff f0 48 print_address_description+0x6c/0x20b mm/kasan/report.c:256 0f b3 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412 08 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 e8 find_first_bit+0xf7/0x100 lib/find_bit.c:107 shrink_slab_memcg mm/vmscan.c:580 [inline] shrink_slab+0x5d0/0xdb0 mm/vmscan.c:672 ed b5 da ff 48 8b shrink_node+0x429/0x16a0 mm/vmscan.c:2736 85 c0 fd ff ff c7 00 f8 f8 f8 f8 kswapd_shrink_node mm/vmscan.c:3458 [inline] balance_pgdat+0x7ca/0x1010 mm/vmscan.c:3568 c6 40 04 f8 e9 kswapd+0x82e/0x12f0 mm/vmscan.c:3790 5d fb ff ff e8 d2 b5 da ff <0f> 0b e8 kthread+0x345/0x410 kernel/kthread.c:246 cb b5 da ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415 ff 48 Allocated by task 8993: 8b save_stack+0x43/0xd0 mm/kasan/kasan.c:448 9d set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 d8 __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node+0x47/0x70 mm/slab.c:3689 kmalloc_node include/linux/slab.h:555 [inline] kvmalloc_node+0x65/0xf0 mm/util.c:423 fd kvmalloc include/linux/mm.h:557 [inline] memcg_expand_one_shrinker_map mm/memcontrol.c:341 [inline] memcg_expand_shrinker_maps+0x1b1/0x3c0 mm/memcontrol.c:416 ff prealloc_memcg_shrinker mm/vmscan.c:185 [inline] prealloc_shrinker+0x29e/0x450 mm/vmscan.c:366 alloc_super+0x8dd/0xb10 fs/super.c:264 ff sget_fc+0x269/0x960 fs/super.c:540 31 vfs_get_super+0x6e/0x270 fs/super.c:1263 ff hugetlbfs_get_tree+0x21/0x30 fs/hugetlbfs/inode.c:1273 48 89 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1751 do_new_mount fs/namespace.c:2567 [inline] do_mount+0x6c1/0x1fb0 fs/namespace.c:2889 de ksys_mount+0x12d/0x140 fs/namespace.c:3105 e8 __do_sys_mount fs/namespace.c:3119 [inline] __se_sys_mount fs/namespace.c:3116 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3116 ea do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 b6 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 7546: RSP: 0018:ffff880199d15e60 EFLAGS: 00010246 save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 RAX: 0000000000040000 RBX: ffff880199d160b0 RCX: ffffc90002c0b000 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 RDX: 0000000000040000 RSI: ffffffff81a1c48e RDI: 0000000000000007 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 RBP: ffff880199d160d8 R08: ffff8801c9c40540 R09: ffffed0039821d18 kvfree+0x61/0x70 mm/util.c:442 R10: ffffed0039821d18 R11: ffff8801cc10e8c7 R12: dffffc0000000000 __vunmap+0x326/0x460 mm/vmalloc.c:1529 R13: ffff8801cc31b1f0 R14: 0000000000000000 R15: ffff880199d15ef0 vfree+0x68/0x100 mm/vmalloc.c:1593 FS: 00007fd6b2fad700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 __do_replace+0x8c9/0xad0 net/ipv6/netfilter/ip6_tables.c:1113 do_replace net/ipv6/netfilter/ip6_tables.c:1160 [inline] do_ip6t_set_ctl+0x49c/0x64b net/ipv6/netfilter/ip6_tables.c:1684 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000607304 CR3: 0000000196060000 CR4: 00000000001406f0 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x7d/0xd0 net/netfilter/nf_sockopt.c:115 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 ipv6_setsockopt+0x105/0x170 net/ipv6/ipv6_sockglue.c:937 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 tcp_setsockopt+0x93/0xe0 net/ipv4/tcp.c:3059 Call Trace: sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:3083 __sys_setsockopt+0x1c5/0x3b0 net/socket.c:1912 __do_sys_setsockopt net/socket.c:1923 [inline] __se_sys_setsockopt net/socket.c:1920 [inline] __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1920 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801d687a380 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 16 bytes inside of 32-byte region [ffff8801d687a380, ffff8801d687a3a0) The buggy address belongs to the page: shrink_node+0x429/0x16a0 mm/vmscan.c:2736 page:ffffea00075a1e80 count:1 mapcount:0 mapping:ffff8801da8001c0 index:0xffff8801d687afc1 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea00073537c8 ffff8801da801248 ffff8801da8001c0 raw: ffff8801d687afc1 ffff8801d687a000 000000010000003f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d687a280: 05 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc ffff8801d687a300: 00 00 00 fc fc fc fc fc fb fb fb fb fc fc fc fc >ffff8801d687a380: 00 00 06 fc fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff8801d687a400: 00 00 00 fc fc fc fc fc fb fb fb fb fc fc fc fc shrink_zones mm/vmscan.c:2965 [inline] do_try_to_free_pages+0x3e7/0x1290 mm/vmscan.c:3027 ffff8801d687a480: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================