will be removed in v5.15!
======================================================
ntfs: (device loop2): ntfs_fill_super(): Not an NTFS volume.
BFS-fs: bfs_fill_super(): loop4 is unclean, continuing
==================================================================
BUG: KASAN: slab-out-of-bounds in find_first_zero_bit+0x84/0x90 lib/find_bit.c:105
Read of size 8 at addr ffff8880a24d7c00 by task syz-executor.4/9581

CPU: 0 PID: 9581 Comm: syz-executor.4 Not tainted 4.14.307-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:251
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:350
 kasan_report mm/kasan/report.c:408 [inline]
 __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:429
 find_first_zero_bit+0x84/0x90 lib/find_bit.c:105
 bfs_create+0xfb/0x620 fs/bfs/dir.c:92
 lookup_open+0x77a/0x1750 fs/namei.c:3241
 do_last fs/namei.c:3334 [inline]
 path_openat+0xe08/0x2970 fs/namei.c:3571
 do_filp_open+0x179/0x3c0 fs/namei.c:3605
 do_sys_open+0x296/0x410 fs/open.c:1081
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f91d76770f9
RSP: 002b:00007f91d5be9168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f91d7796f80 RCX: 00007f91d76770f9
RDX: 0000000000000241 RSI: 0000000020000040 RDI: ffffffffffffff9c
RBP: 00007f91d76d2ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000408 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcf40a06df R14: 00007f91d5be9300 R15: 0000000000022000

Allocated by task 9581:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 __do_kmalloc mm/slab.c:3720 [inline]
 __kmalloc+0x15a/0x400 mm/slab.c:3729
 kmalloc include/linux/slab.h:493 [inline]
 kzalloc include/linux/slab.h:661 [inline]
 bfs_fill_super+0x3d5/0xd80 fs/bfs/inode.c:363
 mount_bdev+0x2b3/0x360 fs/super.c:1134
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2572 [inline]
 do_mount+0xe65/0x2a30 fs/namespace.c:2905
 SYSC_mount fs/namespace.c:3121 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3098
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3

Freed by task 6291:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xc9/0x250 mm/slab.c:3815
 single_release+0x85/0xb0 fs/seq_file.c:609
 close_pdeo.part.0+0xdd/0x2c0 fs/proc/inode.c:165
 close_pdeo fs/proc/inode.c:382 [inline]
 proc_reg_release+0x1fd/0x250 fs/proc/inode.c:376
 __fput+0x25f/0x7a0 fs/file_table.c:210
 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+0x5e/0xd3

The buggy address belongs to the object at ffff8880a24d7c00
 which belongs to the cache kmalloc-32 of size 32
XFS (loop0): Superblock has unknown read-only compatible features (0x8) enabled.
The buggy address is located 0 bytes inside of
 32-byte region [ffff8880a24d7c00, ffff8880a24d7c20)
The buggy address belongs to the page:
page:ffffea00028935c0 count:1 mapcount:0 mapping:ffff8880a24d7000 index:0xffff8880a24d7fc1
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffff8880a24d7000 ffff8880a24d7fc1 000000010000003f
raw: ffffea0002d51020 ffffea000289e520 ffff88813fe741c0 0000000000000000
XFS (loop0): Attempted to mount read-only compatible filesystem read-write.
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a24d7b00: 00 fc fc fc fc fc fc fc 00 00 fc fc fc fc fc fc
 ffff8880a24d7b80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8880a24d7c00: 07 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
                   ^
 ffff8880a24d7c80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880a24d7d00: 07 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================
XFS (loop0): Filesystem can only be safely mounted read only.