overlayfs: missing 'lowerdir'
overlayfs: filesystem on './bus' not supported as upperdir
BUG: unable to handle kernel paging request at fffffbfffdbfbcb7
IP: __read_once_size include/linux/compiler.h:183 [inline]
IP: atomic_read arch/x86/include/asm/atomic.h:27 [inline]
IP: dqput.part.0+0x9d/0x750 fs/quota/dquot.c:761
PGD 23fff0067 P4D 23fff0067 PUD 23ffef067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 8044 Comm: syz-executor.5 Not tainted 4.14.212-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888055fea180 task.stack: ffff888055ff0000
RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline]
RIP: 0010:atomic_read arch/x86/include/asm/atomic.h:27 [inline]
RIP: 0010:dqput.part.0+0x9d/0x750 fs/quota/dquot.c:761
RSP: 0018:ffff888055ff7a90 EFLAGS: 00010282
RAX: dffffc0000000000 RBX: ffffffffedfde4c4 RCX: 00000000000011a8
RDX: 1ffffffff11c2502 RSI: 0000000000000001 RDI: ffffffff88e12804
RBP: dffffc0000000000 R08: ffffffff8b991800 R09: 00000000000401cd
R10: ffff888055feaa30 R11: ffff888055fea180 R12: 0000000000000007
R13: fffffbfffdbfbcb7 R14: ffffffffedfde5dc R15: ffffffffedfde5bc
FS:  0000000002c89940(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffbfffdbfbcb7 CR3: 0000000055fda000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 dqput fs/quota/dquot.c:748 [inline]
 dqput_all fs/quota/dquot.c:391 [inline]
 __dquot_drop+0x193/0x250 fs/quota/dquot.c:1564
 dquot_drop fs/quota/dquot.c:1589 [inline]
 dquot_drop+0x13e/0x190 fs/quota/dquot.c:1567
 ext4_clear_inode+0x31/0x1d0 fs/ext4/super.c:1110
 ext4_evict_inode+0x1f1/0x1500 fs/ext4/inode.c:347
 evict+0x2c8/0x700 fs/inode.c:555
 dispose_list+0x109/0x1e0 fs/inode.c:590
 evict_inodes+0x2cd/0x3a0 fs/inode.c:640
 generic_shutdown_super+0xb3/0x370 fs/super.c:438
 kill_block_super+0x95/0xe0 fs/super.c:1161
 deactivate_locked_super+0x6c/0xd0 fs/super.c:319
 deactivate_super+0x7f/0xa0 fs/super.c:350
 cleanup_mnt+0x186/0x2c0 fs/namespace.c:1183
 task_work_run+0x11f/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x460b77
RSP: 002b:00007ffdb01087d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000031b91 RCX: 0000000000460b77
RDX: 00000000004032c8 RSI: 0000000000000002 RDI: 00007ffdb0108880
RBP: 000000000000004a R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000005 R11: 0000000000000246 R12: 00007ffdb0109910
R13: 0000000002c8aa60 R14: 0000000000000000 R15: 0000000000031a01
Code: 8d b3 18 01 00 00 49 c1 ed 03 41 83 e4 07 49 01 ed 41 83 c4 03 e8 24 e2 90 01 e8 5f 4a b7 ff 48 c7 c7 00 28 e1 88 e8 53 a5 80 05 <41> 0f b6 45 00 41 38 c4 7c 08 84 c0 0f 85 cf 04 00 00 8b 83 f8 
RIP: __read_once_size include/linux/compiler.h:183 [inline] RSP: ffff888055ff7a90
RIP: atomic_read arch/x86/include/asm/atomic.h:27 [inline] RSP: ffff888055ff7a90
RIP: dqput.part.0+0x9d/0x750 fs/quota/dquot.c:761 RSP: ffff888055ff7a90
CR2: fffffbfffdbfbcb7
---[ end trace ecd32f0c7c47f922 ]---