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@xxxxxxxxxxxxxxxxxxxxxxxxx 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 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
