==================================================================
BUG: KASAN: slab-out-of-bounds in test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline]
BUG: KASAN: slab-out-of-bounds in bitmap_port_gc_test net/netfilter/ipset/ip_set_bitmap_port.c:67 [inline]
BUG: KASAN: slab-out-of-bounds in bitmap_port_gc+0x112/0x4f0 net/netfilter/ipset/ip_set_bitmap_gen.h:277
Read of size 8 at addr ffff88809d99c640 by task syz-executor136/9980

CPU: 1 PID: 9980 Comm: syz-executor136 Not tainted 5.5.0-rc6-next-20200116-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
 __kasan_report.cold+0x1b/0x32 mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:641
 check_memory_region_inline mm/kasan/generic.c:185 [inline]
 check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192
 __kasan_check_read+0x11/0x20 mm/kasan/common.c:95
 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline]
 bitmap_port_gc_test net/netfilter/ipset/ip_set_bitmap_port.c:67 [inline]
 bitmap_port_gc+0x112/0x4f0 net/netfilter/ipset/ip_set_bitmap_gen.h:277
 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0x6c3/0x1790 kernel/time/timer.c:1786
 __do_softirq+0x262/0x98c kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x19b/0x1e0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:clear_page_erms+0x7/0x10 arch/x86/lib/clear_page_64.S:49
Code: 48 89 47 18 48 89 47 20 48 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d9 90 c3 0f 1f 80 00 00 00 00 b9 00 10 00 00 31 c0 <f3> aa c3 cc cc cc cc cc cc 55 48 89 e5 41 57 41 56 41 55 41 54 53
RSP: 0018:ffffc900022a7ba0 EFLAGS: 00010246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: ffff888000000000 RCX: 0000000000000140
RDX: 1ffff110150506a6 RSI: ffffffff81a320c6 RDI: ffff8880898a3ec0
RBP: ffffc900022a7bb8 R08: ffff8880a8282140 R09: ffffed1015d27074
R10: ffffed1015d27073 R11: ffff8880ae93839b R12: ffff8880a8282140
R13: 00000000000000a3 R14: 0000000000000000 R15: 0000000000000000
 process_huge_page mm/memory.c:4627 [inline]
 clear_huge_page+0xb5/0x3e0 mm/memory.c:4687
 __do_huge_pmd_anonymous_page mm/huge_memory.c:606 [inline]
 do_huge_pmd_anonymous_page+0x6a6/0x1a50 mm/huge_memory.c:774
 create_huge_pmd mm/memory.c:3888 [inline]
 __handle_mm_fault+0x3421/0x3c20 mm/memory.c:4098
 handle_mm_fault+0x3b2/0xa50 mm/memory.c:4164
 do_user_addr_fault arch/x86/mm/fault.c:1464 [inline]
 do_page_fault+0x545/0x12e1 arch/x86/mm/fault.c:1539
 page_fault+0x39/0x40 arch/x86/entry/entry_64.S:1203
RIP: 0033:0x400761
Code: 03 00 00 00 be 10 00 00 00 bf 29 00 00 00 e8 36 0d 04 00 48 83 f8 ff 74 07 48 89 05 39 a9 2c 00 48 b8 62 69 74 6d 61 70 3a 70 <48> c7 04 25 40 01 00 20 00 00 00 00 c7 04 25 48 01 00 20 00 00 00
RSP: 002b:00007fff74967650 EFLAGS: 00010213
RAX: 703a70616d746962 RBX: 0000000000000000 RCX: 0000000000441499
RDX: 000000000000000c RSI: 0000000000000003 RDI: 0000000000000010
RBP: 0000000000018eac R08: 0000000000000004 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402210
R13: 00000000004022a0 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 9529:
 save_stack+0x23/0x90 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 __kasan_kmalloc mm/kasan/common.c:515 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:488
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:529
 __do_kmalloc mm/slab.c:3656 [inline]
 __kmalloc+0x163/0x770 mm/slab.c:3665
 kmalloc include/linux/slab.h:560 [inline]
 kzalloc include/linux/slab.h:669 [inline]
 ip_set_alloc+0x38/0x5e net/netfilter/ipset/ip_set_core.c:255
 init_map_port net/netfilter/ipset/ip_set_bitmap_port.c:234 [inline]
 bitmap_port_create+0x3dc/0x7c0 net/netfilter/ipset/ip_set_bitmap_port.c:276
 ip_set_create+0x6f1/0x1500 net/netfilter/ipset/ip_set_core.c:1111
 nfnetlink_rcv_msg+0xcf2/0xfb0 net/netfilter/nfnetlink.c:229
 netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
 nfnetlink_rcv+0x1ba/0x460 net/netfilter/nfnetlink.c:563
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x59e/0x7e0 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:672
 ____sys_sendmsg+0x753/0x880 net/socket.c:2343
 ___sys_sendmsg+0x100/0x170 net/socket.c:2397
 __sys_sendmsg+0x105/0x1d0 net/socket.c:2430
 __do_sys_sendmsg net/socket.c:2439 [inline]
 __se_sys_sendmsg net/socket.c:2437 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2437
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 9252:
 save_stack+0x23/0x90 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 kasan_set_free_info mm/kasan/common.c:337 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:476
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:485
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x10a/0x2c0 mm/slab.c:3757
 single_release+0x95/0xc0 fs/seq_file.c:609
 __fput+0x2ff/0x890 fs/file_table.c:280
 ____fput+0x16/0x20 fs/file_table.c:313
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88809d99c640
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
 32-byte region [ffff88809d99c640, ffff88809d99c660)
The buggy address belongs to the page:
page:ffffea0002766700 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff88809d99cfc1
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00025dc0c8 ffffea00029d1e88 ffff8880aa4001c0
raw: ffff88809d99cfc1 ffff88809d99c000 0000000100000039 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809d99c500: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff88809d99c580: 00 00 fc fc fc fc fc fc fb fb fb fb fc fc fc fc
>ffff88809d99c600: fb fb fb fb fc fc fc fc 04 fc fc fc fc fc fc fc
                                           ^
 ffff88809d99c680: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff88809d99c700: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================