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BUG: KASAN: slab-out-of-bounds in find_first_zero_bit+0x84/0x90 lib/find_bit.c:105
Read of size 8 at addr ffff8880a8e6b0c0 by task syz-executor.2/9802

CPU: 1 PID: 9802 Comm: syz-executor.2 Not tainted 4.14.305-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
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: 0033:0x7f936cf630f9
RSP: 002b:00007f936b4d5168 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f936d082f80 RCX: 00007f936cf630f9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200000c0
RBP: 00007f936cfbeae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe1cc438bf R14: 00007f936b4d5300 R15: 0000000000022000

Allocated by task 9802:
 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
NILFS (loop1): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
 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 8031:
 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
 free_workqueue_attrs kernel/workqueue.c:3162 [inline]
 apply_wqattrs_prepare+0x6a0/0x980 kernel/workqueue.c:3748
 apply_workqueue_attrs_locked+0x9d/0x120 kernel/workqueue.c:3810
NILFS error (device loop1): nilfs_check_page: bad entry in directory #12: rec_len is too small for name_len - offset=16, inode=2, rec_len=16, name_len=6
 apply_workqueue_attrs kernel/workqueue.c:3843 [inline]
 alloc_and_link_pwqs kernel/workqueue.c:3958 [inline]
 __alloc_workqueue_key+0x56a/0x1080 kernel/workqueue.c:4040
 hci_register_dev+0x21a/0x920 net/bluetooth/hci_core.c:3127
 __vhci_create_device+0x28d/0x540 drivers/bluetooth/hci_vhci.c:139
 vhci_create_device drivers/bluetooth/hci_vhci.c:163 [inline]
 vhci_get_user drivers/bluetooth/hci_vhci.c:219 [inline]
 vhci_write+0x287/0x420 drivers/bluetooth/hci_vhci.c:299
Remounting filesystem read-only
 call_write_iter include/linux/fs.h:1780 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x44c/0x630 fs/read_write.c:482
 vfs_write+0x17f/0x4d0 fs/read_write.c:544
 SYSC_write fs/read_write.c:590 [inline]
 SyS_write+0xf2/0x210 fs/read_write.c:582
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3

The buggy address belongs to the object at ffff8880a8e6b0c0
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
 32-byte region [ffff8880a8e6b0c0, ffff8880a8e6b0e0)
The buggy address belongs to the page:
page:ffffea0002a39ac0 count:1 mapcount:0 mapping:ffff8880a8e6b000 index:0xffff8880a8e6bfc1
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffff8880a8e6b000 ffff8880a8e6bfc1 000000010000003f
NILFS error (device loop1): nilfs_readdir: bad page in #12
raw: ffffea0002a365a0 ffffea0002a25ba0 ffff88813fe741c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a8e6af80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880a8e6b000: 00 fc fc fc fc fc fc fc 05 fc fc fc fc fc fc fc
>ffff8880a8e6b080: 05 fc fc fc fc fc fc fc 07 fc fc fc fc fc fc fc
                                           ^
 ffff8880a8e6b100: 05 fc fc fc fc fc fc fc 00 00 00 fc fc fc fc fc
 ffff8880a8e6b180: 00 00 fc fc fc fc fc fc 06 fc fc fc fc fc fc fc
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