kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 30960 Comm: syz-executor4 Not tainted 4.19.0-rc2+ #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ovl_free_fs+0x504/0x690 fs/overlayfs/super.c:226
Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 78 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 67 01 00 00 49 8b 3c 24 e8 c9 0a 01 00 e9 0c fc
RSP: 0018:ffff8801b8c87798 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff8801cbdb7400 RCX: ffffc900078f9000
RDX: 0000000000000000 RSI: ffffffff828cb065 RDI: 0000000000000001
RBP: ffff8801b8c877f0 R08: ffff8801d8b30440 R09: ffffed003b5c4732
R10: ffffed003b5c4732 R11: ffff8801dae23993 R12: 0000000000000000
R13: ffff8801cbdb7420 R14: fffffffffffffff4 R15: ffff8801cbdb7400
FS:  00007f7807591700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001414008 CR3: 00000001c5c9b000 CR4: 00000000001426e0
Call Trace:
 ovl_fill_super+0x4f4/0x40a3 fs/overlayfs/super.c:1508
kobject: 'loop7' (000000009e1f5c95): kobject_uevent_env
kobject: 'loop7' (000000009e1f5c95): fill_kobj_path: path = '/devices/virtual/block/loop7'
kobject: 'input29' (00000000822b7fdc): kobject_cleanup, parent           (null)
kobject: 'input29' (00000000822b7fdc): calling ktype release
 mount_nodev+0x6b/0x110 fs/super.c:1204
 ovl_mount+0x2c/0x40 fs/overlayfs/super.c:1516
kobject: 'input29': free name
 mount_fs+0xae/0x31d fs/super.c:1261
 vfs_kern_mount.part.35+0xdc/0x4f0 fs/namespace.c:961
kobject: 'loop3' (00000000b23d8554): kobject_uevent_env
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2457 [inline]
 do_mount+0x581/0x31f0 fs/namespace.c:2787
kobject: 'loop3' (00000000b23d8554): fill_kobj_path: path = '/devices/virtual/block/loop3'
 ksys_mount+0x12d/0x140 fs/namespace.c:3003
 __do_sys_mount fs/namespace.c:3017 [inline]
 __se_sys_mount fs/namespace.c:3014 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3014
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457099
Code: fd b4 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 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f7807590c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f78075916d4 RCX: 0000000000457099
RDX: 00000000200000c0 RSI: 0000000020000080 RDI: 0000000000000000
RBP: 0000000000930140 R08: 0000000020000100 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 00000000004d3300 R14: 00000000004c8241 R15: 0000000000000018
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
kobject: 'loop5' (000000005c1b25dc): kobject_uevent_env
kobject: 'loop5' (000000005c1b25dc): fill_kobj_path: path = '/devices/virtual/block/loop5'
netlink: 8 bytes leftover after parsing attributes in process `syz-executor6'.
kobject: '9p-11' (000000009afac654): kobject_add_internal: parent: 'bdi', set: 'devices'
kobject: '9p-11' (000000009afac654): kobject_uevent_env
kobject: '9p-11' (000000009afac654): fill_kobj_path: path = '/devices/virtual/bdi/9p-11'
---[ end trace 94e889166c60adf7 ]---
kobject: 'loop0' (00000000d9392f9c): kobject_uevent_env
RIP: 0010:ovl_free_fs+0x504/0x690 fs/overlayfs/super.c:226
kobject: 'loop0' (00000000d9392f9c): fill_kobj_path: path = '/devices/virtual/block/loop0'
Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 78 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 67 01 00 00 49 8b 3c 24 e8 c9 0a 01 00 e9 0c fc
RSP: 0018:ffff8801b8c87798 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff8801cbdb7400 RCX: ffffc900078f9000
RDX: 0000000000000000 RSI: ffffffff828cb065 RDI: 0000000000000001
RBP: ffff8801b8c877f0 R08: ffff8801d8b30440 R09: ffffed003b5c4732
R10: ffffed003b5c4732 R11: ffff8801dae23993 R12: 0000000000000000
kobject: '9p-12' (00000000f5170198): kobject_add_internal: parent: 'bdi', set: 'devices'
R13: ffff8801cbdb7420 R14: fffffffffffffff4 R15: ffff8801cbdb7400
kobject: 'loop1' (00000000541aabc6): kobject_uevent_env
FS:  00007f7807591700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
kobject: '9p-12' (00000000f5170198): kobject_uevent_env
kobject: '9p-12' (00000000f5170198): fill_kobj_path: path = '/devices/virtual/bdi/9p-12'
kobject: 'loop1' (00000000541aabc6): fill_kobj_path: path = '/devices/virtual/block/loop1'
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kobject: '9p-12' (00000000f5170198): kobject_uevent_env
CR2: 0000001b2d223000 CR3: 00000001c5c9b000 CR4: 00000000001426f0
kobject: 'loop7' (000000009e1f5c95): kobject_uevent_env
kobject: '9p-12' (00000000f5170198): fill_kobj_path: path = '/devices/virtual/bdi/9p-12'