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BUG: KASAN: global-out-of-bounds in string_nocheck lib/vsprintf.c:646 [inline]
BUG: KASAN: global-out-of-bounds in string+0x218/0x2b0 lib/vsprintf.c:728
Read of size 1 at addr ffffffff8c53df2a by task syz-executor/5949

CPU: 0 UID: 0 PID: 5949 Comm: syz-executor Not tainted 6.13.0-rc3-next-20241220-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:489
 kasan_report+0x143/0x180 mm/kasan/report.c:602
 string_nocheck lib/vsprintf.c:646 [inline]
 string+0x218/0x2b0 lib/vsprintf.c:728
 vsnprintf+0x1101/0x1da0 lib/vsprintf.c:2848
 vprintk_store+0x485/0x1240 kernel/printk/printk.c:2279
 vprintk_emit+0x271/0xa10 kernel/printk/printk.c:2408
 __warn_printk+0x263/0x360 kernel/panic.c:797
 look_up_lock_class+0xdb/0x170 kernel/locking/lockdep.c:936
 register_lock_class+0x102/0x980 kernel/locking/lockdep.c:1290
 __lock_acquire+0xf3/0x2100 kernel/locking/lockdep.c:5101
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irq+0xd3/0x120 kernel/locking/spinlock.c:170
 spin_lock_irq include/linux/spinlock.h:376 [inline]
 rcu_pending_has_pending_or_armed fs/bcachefs/rcu_pending.c:592 [inline]
 rcu_pending_exit+0x13f/0x7a0 fs/bcachefs/rcu_pending.c:610
 bch2_fs_btree_key_cache_exit+0x98b/0xab0 fs/bcachefs/btree_key_cache.c:769
 __bch2_fs_free fs/bcachefs/super.c:558 [inline]
 bch2_fs_release+0x206/0x7a0 fs/bcachefs/super.c:612
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x22f/0x480 lib/kobject.c:737
 deactivate_locked_super+0xc4/0x130 fs/super.c:473
 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1414
 task_work_run+0x24f/0x310 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7c58787057
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc76689638 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f7c588018f4 RCX: 00007f7c58787057
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc766896f0
RBP: 00007ffc766896f0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc7668a770
R13: 00007f7c588018f4 R14: 00007ffc7668a7b0 R15: 0000000000000022
 </TASK>

The buggy address belongs to the variable:
 .str+0xa/0x20

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xc53d
flags: 0xfff00000002000(reserved|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000002000 ffffea0000314f48 ffffea0000314f48 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffffffff8c53de00: f9 f9 f9 f9 00 05 f9 f9 02 f9 f9 f9 06 f9 f9 f9
 ffffffff8c53de80: 00 00 00 00 f9 f9 f9 f9 00 00 00 00 00 00 00 00
>ffffffff8c53df00: 00 00 00 00 00 01 f9 f9 00 00 00 04 f9 f9 f9 f9
                                  ^
 ffffffff8c53df80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffff8c53e000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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