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BUG: KASAN: use-after-free in __lock_acquire+0x3e6f/0x54c0 kernel/locking/lockdep.c:4770
Read of size 8 at addr ffff8880266ba4d0 by task iou-sqp-8798/8802

CPU: 0 PID: 8802 Comm: iou-sqp-8798 Not tainted 5.11.0-next-20210224-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+0xfa/0x151 lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232
 __kasan_report mm/kasan/report.c:399 [inline]
 kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416
 __lock_acquire+0x3e6f/0x54c0 kernel/locking/lockdep.c:4770
 lock_acquire kernel/locking/lockdep.c:5510 [inline]
 lock_acquire+0x1ab/0x730 kernel/locking/lockdep.c:5475
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159
 try_to_wake_up+0x98/0x14a0 kernel/sched/core.c:3347
 io_wq_destroy+0x74/0x3d0 fs/io-wq.c:1013
 __io_uring_files_cancel+0x195/0x230 fs/io_uring.c:8810
 io_uring_files_cancel include/linux/io_uring.h:47 [inline]
 do_exit+0x299/0x2a60 kernel/exit.c:780
 io_sq_thread+0x1231/0x19a0 fs/io_uring.c:6800
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Allocated by task 8798:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:427 [inline]
 __kasan_slab_alloc+0x75/0x90 mm/kasan/common.c:460
 kasan_slab_alloc include/linux/kasan.h:223 [inline]
 slab_post_alloc_hook mm/slab.h:516 [inline]
 slab_alloc_node mm/slub.c:2907 [inline]
 kmem_cache_alloc_node+0x16d/0x3c0 mm/slub.c:2943
 alloc_task_struct_node kernel/fork.c:170 [inline]
 dup_task_struct kernel/fork.c:860 [inline]
 copy_process+0x613/0x6fd0 kernel/fork.c:1940
 kernel_clone+0xe7/0xab0 kernel/fork.c:2462
 io_wq_fork_thread+0xa7/0xe0 fs/io-wq.c:601
 io_wq_create+0x81c/0xab0 fs/io-wq.c:985
 io_init_wq_offload fs/io_uring.c:7779 [inline]
 io_uring_alloc_task_context+0x185/0x510 fs/io_uring.c:7798
 io_sq_offload_create fs/io_uring.c:7898 [inline]
 io_uring_create fs/io_uring.c:9441 [inline]
 io_uring_setup+0x1e00/0x2c20 fs/io_uring.c:9526
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 8429:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357
 ____kasan_slab_free mm/kasan/common.c:360 [inline]
 ____kasan_slab_free mm/kasan/common.c:325 [inline]
 __kasan_slab_free+0xf5/0x130 mm/kasan/common.c:367
 kasan_slab_free include/linux/kasan.h:199 [inline]
 slab_free_hook mm/slub.c:1562 [inline]
 slab_free_freelist_hook+0x72/0x1b0 mm/slub.c:1600
 slab_free mm/slub.c:3161 [inline]
 kmem_cache_free+0x8b/0x730 mm/slub.c:3177
 __put_task_struct+0x267/0x3f0 kernel/fork.c:742
 put_task_struct include/linux/sched/task.h:111 [inline]
 delayed_put_task_struct+0x1f6/0x340 kernel/exit.c:173
 rcu_do_batch kernel/rcu/tree.c:2559 [inline]
 rcu_core+0x722/0x1280 kernel/rcu/tree.c:2794
 __do_softirq+0x29b/0x9f6 kernel/softirq.c:345

Last potentially related work creation:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345
 __call_rcu kernel/rcu/tree.c:3039 [inline]
 call_rcu+0xb1/0x700 kernel/rcu/tree.c:3114
 put_task_struct_rcu_user+0x7f/0xb0 kernel/exit.c:179
 context_switch kernel/sched/core.c:4327 [inline]
 __schedule+0x914/0x21a0 kernel/sched/core.c:5075
 schedule+0xcf/0x270 kernel/sched/core.c:5154
 freezable_schedule include/linux/freezer.h:172 [inline]
 do_nanosleep+0x268/0x6a0 kernel/time/hrtimer.c:1884
 hrtimer_nanosleep+0x1f9/0x430 kernel/time/hrtimer.c:1937
 common_nsleep+0xa2/0xc0 kernel/time/posix-timers.c:1227
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1267 [inline]
 __se_sys_clock_nanosleep kernel/time/posix-timers.c:1245 [inline]
 __x64_sys_clock_nanosleep+0x2f4/0x430 kernel/time/posix-timers.c:1245
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff8880266b9c00
 which belongs to the cache task_struct of size 6912
The buggy address is located 2256 bytes inside of
 6912-byte region [ffff8880266b9c00, ffff8880266bb700)
The buggy address belongs to the page:
page:0000000030d23d99 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x266b8
head:0000000030d23d99 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888140004000
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880266ba380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880266ba400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880266ba480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff8880266ba500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880266ba580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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