kernel BUG at mm/vmscan.c:LINE!

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit:    526674536360 Add linux-next specific files for 20180706
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=13853f48400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c8d1cfc0cb798e48
dashboard link: https://syzkaller.appspot.com/bug?extid=93c67806397421af04d5
compiler:       gcc (GCC) 8.0.1 20180413 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+93c67806397421af04d5@xxxxxxxxxxxxxxxxxxxxxxxxx

------------[ cut here ]------------
kernel BUG at mm/vmscan.c:593!
invalid opcode: 0000 [#1] SMP KASAN
CPU: 0 PID: 5039 Comm: syz-executor5 Not tainted 4.18.0-rc3-next-20180706+  
#1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
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 ff f0 48 0f b3 08 e8 3d b8 da ff 48 8b 85 c0 fd ff ff c7  
00 f8 f8 f8 f8 c6 40 04 f8 e9 5d fb ff ff e8 22 b8 da ff <0f> 0b e8 1b b8  
da ff 48 8b 9d d8 fd ff ff 31 ff 48 89 de e8 3a b9
RSP: 0018:ffff88019aa0eb50 EFLAGS: 00010212
RAX: 0000000000040000 RBX: ffff88019aa0eda0 RCX: ffffc90001e24000
RDX: 0000000000000b7a RSI: ffffffff81a1c23e RDI: 0000000000000007
RBP: ffff88019aa0edc8 R08: ffff88019ed86340 R09: ffffed00399ff4b8
R10: ffffed00399ff4b8 R11: ffff8801ccffa5c7 R12: dffffc0000000000
R13: ffff8801cc3231f0 R14: 0000000000000000 R15: ffff88019aa0ebe0
FS:  00007fa51a834700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa51a803008 CR3: 00000001ad011000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 shrink_node+0x429/0x16a0 mm/vmscan.c:2736
 shrink_zones mm/vmscan.c:2965 [inline]
 do_try_to_free_pages+0x3e7/0x1290 mm/vmscan.c:3027
 try_to_free_mem_cgroup_pages+0x49d/0xc90 mm/vmscan.c:3325
 memory_high_write+0x283/0x310 mm/memcontrol.c:5597
 cgroup_file_write+0x31f/0x840 kernel/cgroup/cgroup.c:3500
 kernfs_fop_write+0x2ba/0x480 fs/kernfs/file.c:316
 __vfs_write+0x117/0x9f0 fs/read_write.c:485
 __kernel_write+0x10c/0x370 fs/read_write.c:506
 write_pipe_buf+0x181/0x240 fs/splice.c:798
 splice_from_pipe_feed fs/splice.c:503 [inline]
 __splice_from_pipe+0x38e/0x7c0 fs/splice.c:627
 splice_from_pipe+0x1ea/0x340 fs/splice.c:662
 default_file_splice_write+0x3c/0x90 fs/splice.c:810
 do_splice_from fs/splice.c:852 [inline]
 direct_splice_actor+0x128/0x190 fs/splice.c:1019
 splice_direct_to_actor+0x318/0x8f0 fs/splice.c:974
 do_splice_direct+0x2d4/0x420 fs/splice.c:1062
 do_sendfile+0x62a/0xe20 fs/read_write.c:1440
 __do_sys_sendfile64 fs/read_write.c:1495 [inline]
 __se_sys_sendfile64 fs/read_write.c:1487 [inline]
 __x64_sys_sendfile64+0x15d/0x250 fs/read_write.c:1487
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455ba9
Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7  
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff  
ff 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa51a833c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fa51a8346d4 RCX: 0000000000455ba9
RDX: 0000000020000040 RSI: 0000000000000015 RDI: 0000000000000015
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004c0dc5 R14: 00000000004d0e78 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace 607c0e9f278af1e6 ]---
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 ff f0 48 0f b3 08 e8 3d b8 da ff 48 8b 85 c0 fd ff ff c7  
00 f8 f8 f8 f8 c6 40 04 f8 e9 5d fb ff ff e8 22 b8 da ff <0f> 0b e8 1b b8  
da ff 48 8b 9d d8 fd ff ff 31 ff 48 89 de e8 3a b9
RSP: 0018:ffff88019aa0eb50 EFLAGS: 00010212
RAX: 0000000000040000 RBX: ffff88019aa0eda0 RCX: ffffc90001e24000
RDX: 0000000000000b7a RSI: ffffffff81a1c23e RDI: 0000000000000007
RBP: ffff88019aa0edc8 R08: ffff88019ed86340 R09: ffffed00399ff4b8
R10: ffffed00399ff4b8 R11: ffff8801ccffa5c7 R12: dffffc0000000000
R13: ffff8801cc3231f0 R14: 0000000000000000 R15: ffff88019aa0ebe0
FS:  00007fa51a834700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa51a803008 CR3: 00000001ad011000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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