BFS-fs: bfs_fill_super(): loop2 is unclean, continuing
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BUG: KASAN: slab-out-of-bounds in find_first_zero_bit+0xa8/0xb0 lib/find_bit.c:125
Read of size 8 at addr ffff8880a3862300 by task syz-executor.2/15770

CPU: 0 PID: 15770 Comm: syz-executor.2 Not tainted 4.19.167-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2fe lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1c7 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
 find_first_zero_bit+0xa8/0xb0 lib/find_bit.c:125
 bfs_create+0xfb/0x610 fs/bfs/dir.c:91
 vfs_create+0x461/0x6c0 fs/namei.c:2913
 do_mknodat.part.0+0x2ff/0x480 fs/namei.c:3768
 do_mknodat fs/namei.c:3789 [inline]
 __do_sys_mknodat fs/namei.c:3792 [inline]
 __se_sys_mknodat fs/namei.c:3789 [inline]
 __x64_sys_mknodat+0x116/0x160 fs/namei.c:3789
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45e219
Code: 0d 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f22c31d2c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000103
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045e219
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000005
RBP: 000000000119bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c
R13: 00007ffe426b735f R14: 00007f22c31d39c0 R15: 000000000119bf8c

Allocated by task 15770:
 __do_kmalloc mm/slab.c:3727 [inline]
 __kmalloc+0x15a/0x3c0 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 kzalloc include/linux/slab.h:709 [inline]
 bfs_fill_super+0x447/0xec0 fs/bfs/inode.c:363
 mount_bdev+0x2fc/0x3b0 fs/super.c:1158
 mount_fs+0xa3/0x30c fs/super.c:1261
 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2469 [inline]
 do_mount+0x113c/0x2f10 fs/namespace.c:2799
 ksys_mount+0xcf/0x130 fs/namespace.c:3015
 __do_sys_mount fs/namespace.c:3029 [inline]
 __se_sys_mount fs/namespace.c:3026 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3026
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 0:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 aa_free_task_ctx security/apparmor/include/task.h:61 [inline]
 apparmor_task_free+0x143/0x1e0 security/apparmor/lsm.c:93
 security_task_free+0x3e/0x70 security/security.c:992
 __put_task_struct+0xea/0x340 kernel/fork.c:688
 put_task_struct include/linux/sched/task.h:98 [inline]
 delayed_put_task_struct+0x1dc/0x320 kernel/exit.c:181
 __rcu_reclaim kernel/rcu/rcu.h:236 [inline]
 rcu_do_batch kernel/rcu/tree.c:2584 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2864 [inline]
 rcu_process_callbacks+0x8ff/0x18b0 kernel/rcu/tree.c:2881
 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292

The buggy address belongs to the object at ffff8880a3862300
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
 32-byte region [ffff8880a3862300, ffff8880a3862320)
The buggy address belongs to the page:
page:ffffea00028e1880 count:1 mapcount:0 mapping:ffff88813bff01c0 index:0xffff8880a3862fc1
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffffea0002bc7388 ffffea0002ccf108 ffff88813bff01c0
raw: ffff8880a3862fc1 ffff8880a3862000 000000010000003f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a3862200: 06 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880a3862280: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8880a3862300: 07 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
                   ^
 ffff8880a3862380: fb fb fb fb fc fc fc fc 00 00 01 fc fc fc fc fc
 ffff8880a3862400: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
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