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BUG: KASAN: slab-out-of-bounds in __lock_acquire+0x108/0x5e40 kernel/locking/lockdep.c:4702
Read of size 8 at addr ffff8880763250a0 by task kworker/1:1/34

CPU: 1 PID: 34 Comm: kworker/1:1 Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events l2cap_chan_timeout
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x183/0x22e lib/dump_stack.c:120
 print_address_description+0x5f/0x3b0 mm/kasan/report.c:230
 __kasan_report mm/kasan/report.c:396 [inline]
 kasan_report+0x15e/0x200 mm/kasan/report.c:413
 __lock_acquire+0x108/0x5e40 kernel/locking/lockdep.c:4702
 lock_acquire+0x174/0x6c0 kernel/locking/lockdep.c:5437
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:175
 spin_lock_bh include/linux/spinlock.h:359 [inline]
 lock_sock_nested+0x43/0x110 net/core/sock.c:3049
 l2cap_sock_teardown_cb+0x76/0x360 net/bluetooth/l2cap_sock.c:1520
 l2cap_chan_del+0xaf/0x610 net/bluetooth/l2cap_core.c:618
 l2cap_chan_timeout+0x12c/0x280 net/bluetooth/l2cap_core.c:436
 process_one_work+0x833/0x10c0 kernel/workqueue.c:2275
 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2421
 kthread+0x39a/0x3c0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Allocated by task 4890:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:401 [inline]
 ____kasan_kmalloc+0xbd/0xf0 mm/kasan/common.c:429
 kasan_kmalloc include/linux/kasan.h:219 [inline]
 __kmalloc+0xaf/0x330 mm/slub.c:3970
 kmalloc include/linux/slab.h:557 [inline]
 tomoyo_realpath_from_path+0xd8/0x610 security/tomoyo/realpath.c:254
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x201/0x650 security/tomoyo/file.c:822
 security_inode_getattr+0xc0/0x140 security/security.c:1280
 vfs_getattr fs/stat.c:121 [inline]
 vfs_statx+0x188/0x3d0 fs/stat.c:189
 vfs_fstatat fs/stat.c:207 [inline]
 vfs_lstat include/linux/fs.h:3122 [inline]
 __do_sys_newlstat fs/stat.c:362 [inline]
 __se_sys_newlstat fs/stat.c:356 [inline]
 __x64_sys_newlstat+0xd3/0x150 fs/stat.c:356
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 4890:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x3d/0x70 mm/kasan/common.c:46
 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:356
 ____kasan_slab_free+0xe2/0x110 mm/kasan/common.c:362
 kasan_slab_free include/linux/kasan.h:192 [inline]
 slab_free_hook mm/slub.c:1547 [inline]
 slab_free_freelist_hook+0xd6/0x1a0 mm/slub.c:1580
 slab_free mm/slub.c:3142 [inline]
 kfree+0xd1/0x2a0 mm/slub.c:4124
 tomoyo_realpath_from_path+0x5ce/0x610 security/tomoyo/realpath.c:291
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x201/0x650 security/tomoyo/file.c:822
 security_inode_getattr+0xc0/0x140 security/security.c:1280
 vfs_getattr fs/stat.c:121 [inline]
 vfs_statx+0x188/0x3d0 fs/stat.c:189
 vfs_fstatat fs/stat.c:207 [inline]
 vfs_lstat include/linux/fs.h:3122 [inline]
 __do_sys_newlstat fs/stat.c:362 [inline]
 __se_sys_newlstat fs/stat.c:356 [inline]
 __x64_sys_newlstat+0xd3/0x150 fs/stat.c:356
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff888076324000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 160 bytes to the right of
 4096-byte region [ffff888076324000, ffff888076325000)
The buggy address belongs to the page:
page:000000006b72c6ed refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x76320
head:000000006b72c6ed order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010842140
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888076324f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888076325000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888076325080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                               ^
 ffff888076325100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888076325180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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