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BUG: KASAN: use-after-free in __lock_acquire+0x3f2d/0x5780 kernel/locking/lockdep.c:4311
Read of size 8 at addr ffff888218633818 by task io_wqe_worker-0/8905

CPU: 0 PID: 8905 Comm: io_wqe_worker-0 Not tainted 5.9.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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+0x3f2d/0x5780 kernel/locking/lockdep.c:4311
 lock_acquire+0x1f3/0xaf0 kernel/locking/lockdep.c:5029
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
 _raw_spin_lock_irq+0x94/0xd0 kernel/locking/spinlock.c:167
 spin_lock_irq include/linux/spinlock.h:379 [inline]
 io_wqe_worker+0xdb6/0x10e0 fs/io-wq.c:589
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Allocated by task 8892:
 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
 kmem_cache_alloc_node_trace+0x17b/0x430 mm/slab.c:3598
 kmalloc_node include/linux/slab.h:572 [inline]
 kzalloc_node include/linux/slab.h:677 [inline]
 io_wq_create+0x57b/0xa10 fs/io-wq.c:1064
 io_init_wq_offload fs/io_uring.c:7457 [inline]
 io_sq_offload_start fs/io_uring.c:7529 [inline]
 io_uring_create fs/io_uring.c:8652 [inline]
 io_uring_setup+0x1836/0x28e0 fs/io_uring.c:8721
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 7:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56
 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355
 __kasan_slab_free+0xd8/0x120 mm/kasan/common.c:422
 __cache_free mm/slab.c:3422 [inline]
 kfree+0x10e/0x2b0 mm/slab.c:3760
 __io_wq_destroy fs/io-wq.c:1138 [inline]
 io_wq_destroy+0x2af/0x460 fs/io-wq.c:1146
 io_finish_async fs/io_uring.c:6861 [inline]
 io_ring_ctx_free fs/io_uring.c:7895 [inline]
 io_ring_exit_work+0x1e4/0x6d0 fs/io_uring.c:7979
 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

The buggy address belongs to the object at ffff888218633800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 24 bytes inside of
 1024-byte region [ffff888218633800, ffff888218633c00)
The buggy address belongs to the page:
page:0000000018882ac5 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x218633
flags: 0x57ffe0000000200(slab)
raw: 057ffe0000000200 ffffea0008575188 ffffea00085a0908 ffff8880aa040700
raw: 0000000000000000 ffff888218633000 0000000100000002 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888218633700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888218633780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888218633800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff888218633880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888218633900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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