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BUG: KASAN: use-after-free in __lock_acquire+0x2c57/0x3f20 kernel/locking/lockdep.c:3369
Read of size 8 at addr ffff88809191c9e0 by task kworker/0:2/29109

CPU: 0 PID: 29109 Comm: kworker/0:2 Not tainted 4.14.278-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events sco_sock_timeout
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x191 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 include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152
 spin_lock include/linux/spinlock.h:317 [inline]
 sco_sock_timeout+0x7b/0x1a0 net/bluetooth/sco.c:95
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Allocated by task 7998:
 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
 __do_kmalloc_node mm/slab.c:3682 [inline]
 __kmalloc_node+0x4c/0x70 mm/slab.c:3689
 kmalloc_node include/linux/slab.h:530 [inline]
 kvmalloc_node+0x46/0xd0 mm/util.c:397
 kvmalloc include/linux/mm.h:531 [inline]
 kvmalloc_array include/linux/mm.h:547 [inline]
 alloc_fdtable+0xc7/0x270 fs/file.c:120
 dup_fd+0x5f2/0xaf0 fs/file.c:315
 copy_files kernel/fork.c:1305 [inline]
 copy_process.part.0+0x1b4f/0x71c0 kernel/fork.c:1779
 copy_process kernel/fork.c:1606 [inline]
 _do_fork+0x184/0xc80 kernel/fork.c:2092
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

Freed by task 28364:
 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
 kvfree+0x45/0x50 mm/util.c:416
 __free_fdtable fs/file.c:36 [inline]
 put_files_struct fs/file.c:425 [inline]
 put_files_struct+0x259/0x340 fs/file.c:418
 exit_files+0x7e/0xa0 fs/file.c:450
 do_exit+0xa18/0x2850 kernel/exit.c:863
 do_group_exit+0x100/0x2e0 kernel/exit.c:965
 get_signal+0x38d/0x1ca0 kernel/signal.c:2412
 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:792
 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

The buggy address belongs to the object at ffff88809191c940
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 160 bytes inside of
 2048-byte region [ffff88809191c940, ffff88809191d140)
The buggy address belongs to the page:
page:ffffea0002464700 count:1 mapcount:0 mapping:ffff88809191c0c0 index:0xffff88809191c0c0 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffff88809191c0c0 ffff88809191c0c0 0000000100000001
raw: ffffea000278d820 ffffea0002a3aea0 ffff88813fe74c40 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809191c880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88809191c900: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>ffff88809191c980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff88809191ca00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809191ca80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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