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BUG: KASAN: use-after-free in __lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3295
Read of size 8 at addr ffff88809af15220 by task kworker/0:0/5

CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Workqueue: events l2cap_chan_timeout
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
 __lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3295
 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:168
 spin_lock_bh include/linux/spinlock.h:334 [inline]
 lock_sock_nested+0x3b/0x110 net/core/sock.c:2884
 l2cap_sock_teardown_cb+0xa0/0x6d0 net/bluetooth/l2cap_sock.c:1348
 l2cap_chan_del+0xbc/0xa50 net/bluetooth/l2cap_core.c:603
 l2cap_chan_close+0x1b5/0x950 net/bluetooth/l2cap_core.c:761
 l2cap_chan_timeout+0x17e/0x2f0 net/bluetooth/l2cap_core.c:430
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Allocated by task 4696:
 kmem_cache_alloc+0x122/0x370 mm/slab.c:3559
 getname_flags+0xce/0x590 fs/namei.c:140
 user_path_at_empty+0x2a/0x50 fs/namei.c:2609
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0x113/0x210 fs/stat.c:185
 vfs_lstat include/linux/fs.h:3137 [inline]
 __do_sys_newlstat fs/stat.c:350 [inline]
 __se_sys_newlstat+0x96/0x120 fs/stat.c:344
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 4696:
 __cache_free mm/slab.c:3503 [inline]
 kmem_cache_free+0x7f/0x260 mm/slab.c:3765
 putname+0xe1/0x120 fs/namei.c:261
 filename_lookup+0x3d0/0x5a0 fs/namei.c:2358
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0x113/0x210 fs/stat.c:185
 vfs_lstat include/linux/fs.h:3137 [inline]
 __do_sys_newlstat fs/stat.c:350 [inline]
 __se_sys_newlstat+0x96/0x120 fs/stat.c:344
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88809af147c0
 which belongs to the cache names_cache of size 4096
The buggy address is located 2656 bytes inside of
 4096-byte region [ffff88809af147c0, ffff88809af157c0)
The buggy address belongs to the page:
page:ffffea00026bc500 count:1 mapcount:0 mapping:ffff88823b843380 index:0x0 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffffea0001489e08 ffffea0002884f88 ffff88823b843380
raw: 0000000000000000 ffff88809af147c0 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809af15100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809af15180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88809af15200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff88809af15280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809af15300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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