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BUG: KASAN: slab-out-of-bounds in __lock_acquire+0x42db/0x5780 kernel/locking/lockdep.c:4315
Read of size 8 at addr ffff8880a812d0a8 by task kworker/1:11/5267

CPU: 1 PID: 5267 Comm: kworker/1:11 Not tainted 5.9.0-rc6-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:77 [inline]
 dump_stack+0x198/0x1fd lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 __lock_acquire+0x42db/0x5780 kernel/locking/lockdep.c:4315
 lock_acquire+0x1f3/0xaf0 kernel/locking/lockdep.c:5029
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:175
 spin_lock_bh include/linux/spinlock.h:359 [inline]
 lock_sock_nested+0x3b/0x110 net/core/sock.c:3041
 l2cap_sock_teardown_cb+0x88/0x400 net/bluetooth/l2cap_sock.c:1520
 l2cap_chan_del+0xad/0x1300 net/bluetooth/l2cap_core.c:618
 l2cap_chan_close+0x118/0xb10 net/bluetooth/l2cap_core.c:823
 l2cap_chan_timeout+0x173/0x450 net/bluetooth/l2cap_core.c:436
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Allocated by task 31120:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
 slab_post_alloc_hook mm/slab.h:518 [inline]
 slab_alloc mm/slab.c:3312 [inline]
 kmem_cache_alloc+0x13a/0x3f0 mm/slab.c:3482
 kmem_cache_zalloc include/linux/slab.h:656 [inline]
 __kernfs_new_node+0xd4/0x8b0 fs/kernfs/dir.c:627
 kernfs_new_node+0x93/0x120 fs/kernfs/dir.c:689
 __kernfs_create_file+0x51/0x350 fs/kernfs/file.c:1002
 sysfs_add_file_mode_ns+0x226/0x540 fs/sysfs/file.c:305
 create_files fs/sysfs/group.c:64 [inline]
 internal_create_group+0x328/0xb20 fs/sysfs/group.c:149
 add_port drivers/infiniband/core/sysfs.c:1108 [inline]
 ib_setup_port_attrs+0x6f0/0x14f0 drivers/infiniband/core/sysfs.c:1366
 add_one_compat_dev+0x4ab/0x800 drivers/infiniband/core/device.c:917
 rdma_dev_init_net+0x2dc/0x480 drivers/infiniband/core/device.c:1133
 ops_init+0xaf/0x470 net/core/net_namespace.c:151
 setup_net+0x2d8/0x850 net/core/net_namespace.c:341
 copy_net_ns+0x2cf/0x5e0 net/core/net_namespace.c:482
 create_new_namespaces+0x3f6/0xb10 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:231
 ksys_unshare+0x445/0x8e0 kernel/fork.c:2921
 __do_sys_unshare kernel/fork.c:2989 [inline]
 __se_sys_unshare kernel/fork.c:2987 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:2987
 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 ffff8880a812d000
 which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 0 bytes to the right of
 168-byte region [ffff8880a812d000, ffff8880a812d0a8)
The buggy address belongs to the page:
page:00000000f1b86fbc refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa812d
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea0000cb9e48 ffffea00005e3408 ffff8880aa221a00
raw: 0000000000000000 ffff8880a812d000 0000000100000011 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a812cf80: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
 ffff8880a812d000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880a812d080: 00 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 00
                                  ^
 ffff8880a812d100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880a812d180: 00 00 fc fc fc fc fc fc fc fc 00 00 00 00 00 00
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