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BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:71 [inline]
BUG: KASAN: use-after-free in atomic64_read include/asm-generic/atomic-instrumented.h:837 [inline]
BUG: KASAN: use-after-free in atomic_long_read include/asm-generic/atomic-long.h:29 [inline]
BUG: KASAN: use-after-free in __mutex_unlock_slowpath+0x88/0x520 kernel/locking/mutex.c:1227
Read of size 8 at addr ffff88806ebc4008 by task iou-sqp-12398/12399

CPU: 0 PID: 12399 Comm: iou-sqp-12398 Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x176/0x24e lib/dump_stack.c:120
 print_address_description+0x5f/0x3a0 mm/kasan/report.c:232
 __kasan_report mm/kasan/report.c:399 [inline]
 kasan_report+0x15e/0x210 mm/kasan/report.c:416
 check_region_inline mm/kasan/generic.c:135 [inline]
 kasan_check_range+0x2b5/0x2f0 mm/kasan/generic.c:186
 instrument_atomic_read include/linux/instrumented.h:71 [inline]
 atomic64_read include/asm-generic/atomic-instrumented.h:837 [inline]
 atomic_long_read include/asm-generic/atomic-long.h:29 [inline]
 __mutex_unlock_slowpath+0x88/0x520 kernel/locking/mutex.c:1227
 io_sq_thread+0x1510/0x1520 fs/io_uring.c:6773
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Allocated by task 12398:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:427 [inline]
 ____kasan_kmalloc+0xc2/0xf0 mm/kasan/common.c:506
 kasan_kmalloc include/linux/kasan.h:233 [inline]
 kmem_cache_alloc_trace+0x21b/0x350 mm/slub.c:2934
 kmalloc include/linux/slab.h:554 [inline]
 kzalloc include/linux/slab.h:684 [inline]
 io_get_sq_data fs/io_uring.c:7177 [inline]
 io_sq_offload_create fs/io_uring.c:7873 [inline]
 io_uring_create fs/io_uring.c:9401 [inline]
 io_uring_setup fs/io_uring.c:9484 [inline]
 __do_sys_io_uring_setup fs/io_uring.c:9490 [inline]
 __se_sys_io_uring_setup+0x1230/0x2980 fs/io_uring.c:9487
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 270:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x3d/0x70 mm/kasan/common.c:46
 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:357
 ____kasan_slab_free+0x100/0x140 mm/kasan/common.c:360
 kasan_slab_free include/linux/kasan.h:199 [inline]
 slab_free_hook mm/slub.c:1562 [inline]
 slab_free_freelist_hook+0x171/0x270 mm/slub.c:1600
 slab_free mm/slub.c:3161 [inline]
 kfree+0xcf/0x2d0 mm/slub.c:4213
 io_put_sq_data fs/io_uring.c:7116 [inline]
 io_sq_thread_finish+0x56a/0x5c0 fs/io_uring.c:7139
 io_ring_ctx_free fs/io_uring.c:8408 [inline]
 io_ring_exit_work+0x85/0x750 fs/io_uring.c:8539
 process_one_work+0x789/0xfd0 kernel/workqueue.c:2275
 worker_thread+0xac1/0x1300 kernel/workqueue.c:2421
 kthread+0x39a/0x3c0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

The buggy address belongs to the object at ffff88806ebc4000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 8 bytes inside of
 1024-byte region [ffff88806ebc4000, ffff88806ebc4400)
The buggy address belongs to the page:
page:00000000f6820e41 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88806ebc0800 pfn:0x6ebc0
head:00000000f6820e41 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 ffffea0000743c08 ffffea0000b35e08 ffff888010841dc0
raw: ffff88806ebc0000 000000000010000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88806ebc3f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88806ebc3f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88806ebc4000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff88806ebc4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88806ebc4100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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