linux-kernel - kernel BUG at mm/internal.h:LINE! (2)

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Date:   Wed, 29 Jul 2020 13:04:21 -0700
From:   syzbot <syzbot+f62749569eab36774dc5@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, syzkaller-bugs@...glegroups.com
Subject: kernel BUG at mm/internal.h:LINE! (2)

Hello,

syzbot found the following issue on:

HEAD commit:    68845a55 Merge branch 'akpm' into master (patches from And..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17c86c54900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f87a5e4232fdb267
dashboard link: https://syzkaller.appspot.com/bug?extid=f62749569eab36774dc5
compiler:       gcc (GCC) 10.1.0-syz 20200507

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f62749569eab36774dc5@...kaller.appspotmail.com

vma ffff888000153210 start 0007700000077000 end 0000000000077000
next 0007700000000000 prev 0000000007070707 mm 0007700000000000
prot 77700000077000 anon_vma 0000000000000000 vm_ops ffffffff885cecc0
pgoff 0 file ffff88809e09a7c0 private_data 0000000000000000
flags: 0x0()
------------[ cut here ]------------
kernel BUG at mm/internal.h:401!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 1676 Comm: kswapd0 Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:vma_address mm/internal.h:401 [inline]
RIP: 0010:vma_address mm/internal.h:393 [inline]
RIP: 0010:rmap_walk_file+0x6a4/0xbf0 mm/rmap.c:1921
Code: e8 91 20 cc ff 48 83 eb 01 48 89 e8 48 29 d8 48 c1 f8 06 48 01 44 24 18 e9 1a fb ff ff e8 74 20 cc ff 4c 89 e7 e8 95 e3 f9 ff <0f> 0b e8 65 20 cc ff 48 8b 44 24 10 4c 8d 68 78 4c 89 ef e8 b4 8a
RSP: 0018:ffffc90006987598 EFLAGS: 00010287
RAX: 000000000000010f RBX: 000770000019e000 RCX: 0000000000000000
RDX: ffff8880a425e540 RSI: ffffffff815d4eb7 RDI: fffff52000d30e8e
RBP: ffffea00021eac40 R08: 000000000000010f R09: ffff8880ae6318e7
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888000153210
R13: dffffc0000000000 R14: 0007700000077000 R15: 0000000000077000
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000788070 CR3: 000000020b00c000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 rmap_walk+0x105/0x190 mm/rmap.c:1946
 page_referenced+0x417/0x4b0 mm/rmap.c:888
 shrink_active_list+0x3a6/0x1350 mm/vmscan.c:2061
 shrink_list mm/vmscan.c:2167 [inline]
 shrink_lruvec+0x842/0x10f0 mm/vmscan.c:2467
 shrink_node_memcgs mm/vmscan.c:2656 [inline]
 shrink_node+0x4b0/0x1b60 mm/vmscan.c:2770
 kswapd_shrink_node mm/vmscan.c:3517 [inline]
 balance_pgdat+0x72f/0x10d0 mm/vmscan.c:3675
 kswapd+0x5a5/0xe70 mm/vmscan.c:3932
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
Modules linked in:
---[ end trace aecaf7276f5d1d16 ]---
RIP: 0010:vma_address mm/internal.h:401 [inline]
RIP: 0010:vma_address mm/internal.h:393 [inline]
RIP: 0010:rmap_walk_file+0x6a4/0xbf0 mm/rmap.c:1921
Code: e8 91 20 cc ff 48 83 eb 01 48 89 e8 48 29 d8 48 c1 f8 06 48 01 44 24 18 e9 1a fb ff ff e8 74 20 cc ff 4c 89 e7 e8 95 e3 f9 ff <0f> 0b e8 65 20 cc ff 48 8b 44 24 10 4c 8d 68 78 4c 89 ef e8 b4 8a
RSP: 0018:ffffc90006987598 EFLAGS: 00010287
RAX: 000000000000010f RBX: 000770000019e000 RCX: 0000000000000000
RDX: ffff8880a425e540 RSI: ffffffff815d4eb7 RDI: fffff52000d30e8e
RBP: ffffea00021eac40 R08: 000000000000010f R09: ffff8880ae6318e7
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888000153210
R13: dffffc0000000000 R14: 0007700000077000 R15: 0000000000077000
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000788070 CR3: 000000020b00c000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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