==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x2c57/0x3f20 kernel/locking/lockdep.c:3369
Read of size 8 at addr ffff888090febca0 by task kworker/u4:1/22

CPU: 1 PID: 22 Comm: kworker/u4:1 Not tainted 4.14.196-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: tipc_rcv tipc_recv_work
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430
 __lock_acquire+0x2c57/0x3f20 kernel/locking/lockdep.c:3369
 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:176
 spin_lock_bh include/linux/spinlock.h:322 [inline]
 tipc_subscrp_subscribe net/tipc/subscr.c:299 [inline]
 tipc_subscrb_rcv_cb+0x4d4/0xa40 net/tipc/subscr.c:338
 tipc_receive_from_sock+0x25c/0x450 net/tipc/server.c:273
 tipc_recv_work+0x75/0xd0 net/tipc/server.c:547
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Allocated by task 2342:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 kmem_cache_alloc_trace+0x131/0x3d0 mm/slab.c:3618
 kmalloc include/linux/slab.h:488 [inline]
 kzalloc include/linux/slab.h:661 [inline]
 tipc_subscrb_create net/tipc/subscr.c:223 [inline]
 tipc_subscrb_connect_cb+0x40/0x150 net/tipc/subscr.c:344
 tipc_accept_from_sock+0x25b/0x400 net/tipc/server.c:313
 tipc_recv_work+0x75/0xd0 net/tipc/server.c:547
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Freed by task 2342:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xc9/0x250 mm/slab.c:3815
 tipc_subscrb_kref_release net/tipc/subscr.c:155 [inline]
 kref_put include/linux/kref.h:70 [inline]
 tipc_subscrb_put+0x22/0x30 net/tipc/subscr.c:160
 tipc_close_conn+0x16a/0x200 net/tipc/server.c:203
 tipc_send_to_sock net/tipc/server.c:538 [inline]
 tipc_send_work+0x41e/0x520 net/tipc/server.c:564
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

The buggy address belongs to the object at ffff888090febc80
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 32 bytes inside of
 96-byte region [ffff888090febc80, ffff888090febce0)
The buggy address belongs to the page:
page:ffffea000243fac0 count:1 mapcount:0 mapping:ffff888090feb000 index:0xffff888090feb000
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffff888090feb000 ffff888090feb000 0000000100000019
raw: ffffea00023aaa20 ffffea00024221e0 ffff88812fe524c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888090febb80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888090febc00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff888090febc80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                               ^
 ffff888090febd00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888090febd80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================