RDX: 000000000001ff60 RSI: 0000000020000080 RDI: 0000000000000016
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000017
R13: 00000000004c2e51 R14: 00000000004d4c30 R15: 0000000000000004
==================================================================
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 ffff8801d7599dd0 by task kswapd0/1530
kernel BUG at mm/vmscan.c:593!

invalid opcode: 0000 [#1] SMP KASAN
CPU: 1 PID: 1530 Comm: kswapd0 Not tainted 4.18.0-rc3-next-20180709+ #2
CPU: 0 PID: 15768 Comm: syz-executor4 Not tainted 4.18.0-rc3-next-20180709+ #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
RIP: 0010:shrink_slab_memcg mm/vmscan.c:593 [inline]
RIP: 0010:shrink_slab+0xb3e/0xdb0 mm/vmscan.c:672
Code: 
8d 
a8 
fd ff 
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
ff 
f0 
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412
48 
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
0f b3 
 find_first_bit+0xf7/0x100 lib/find_bit.c:107
08 
 shrink_slab_memcg mm/vmscan.c:580 [inline]
 shrink_slab+0x5d0/0xdb0 mm/vmscan.c:672
e8 
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 
 kswapd+0x82e/0x12f0 mm/vmscan.c:3790
e9 
5d fb 
ff ff 
e8 
d2 
b5 
da 
ff 
<0f> 
0b 
e8 
 kthread+0x345/0x410 kernel/kthread.c:246
cb 
b5 
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415
da 

ff 
Allocated by task 7603:
48 
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
8b 
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
 __do_kmalloc_node mm/slab.c:3682 [inline]
 __kmalloc_node+0x47/0x70 mm/slab.c:3689
9d 
 kmalloc_node include/linux/slab.h:555 [inline]
 kvmalloc_node+0x65/0xf0 mm/util.c:423
d8 
 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
fd 
 prealloc_memcg_shrinker mm/vmscan.c:185 [inline]
 prealloc_shrinker+0x29e/0x450 mm/vmscan.c:366
ff ff 
 alloc_super+0x8dd/0xb10 fs/super.c:264
31 ff 
 sget_userns+0x276/0x860 fs/super.c:615
48 
 sget+0x10b/0x150 fs/super.c:667
89 
 mount_nodev+0x38/0x120 fs/super.c:1393
de e8 
 fuse_mount+0x34/0x40 fs/fuse/inode.c:1212
ea 
 legacy_get_tree+0x118/0x440 fs/fs_context.c:659
b6 
 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
RSP: 0018:ffff880193696260 EFLAGS: 00010293
 ksys_mount+0x12d/0x140 fs/namespace.c:3105
 __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
RAX: ffff8801ca0ce0c0 RBX: ffff8801936964b0 RCX: ffffffff81a1c182
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
RDX: 0000000000000000 RSI: ffffffff81a1c48e RDI: 0000000000000007
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

RBP: ffff8801936964d8 R08: ffff8801ca0ce0c0 R09: ffffed00399fe088
R10: ffffed00399fe088 R11: ffff8801ccff0447 R12: dffffc0000000000
Freed by task 2797:
R13: ffff8801cc3131f0 R14: 0000000000000000 R15: ffff8801936962f0
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
FS:  00000000013ca940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
CR2: 0000000000ffce80 CR3: 00000001d69a2000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xd9/0x260 mm/slab.c:3813
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
 single_release+0x8f/0xb0 fs/seq_file.c:596
Call Trace:
 __fput+0x35d/0x930 fs/file_table.c:215
 ____fput+0x15/0x20 fs/file_table.c:251
 task_work_run+0x1ec/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:192 [inline]
 exit_to_usermode_loop+0x313/0x370 arch/x86/entry/common.c:166
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8801d7599dc0
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 16 bytes inside of
 32-byte region [ffff8801d7599dc0, ffff8801d7599de0)
 shrink_node+0x429/0x16a0 mm/vmscan.c:2736
The buggy address belongs to the page:
page:ffffea00075d6640 count:1 mapcount:0 mapping:ffff8801da8001c0 index:0xffff8801d7599fc1
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffffea0007599308 ffffea0007528e88 ffff8801da8001c0
raw: ffff8801d7599fc1 ffff8801d7599000 0000000100000035 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d7599c80: 00 01 fc fc fc fc fc fc 00 00 00 fc fc fc fc fc
 ffff8801d7599d00: 00 00 06 fc fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8801d7599d80: 00 00 06 fc fc fc fc fc 00 00 06 fc fc fc fc fc
                                                 ^
 ffff8801d7599e00: fb fb fb fb 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
 ffff8801d7599e80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================