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BUG: KASAN: use-after-free in __wake_up_common+0x637/0x650 kernel/sched/wait.c:100
Read of size 8 at addr ffff88801e01a670 by task syz-executor.1/5107

CPU: 1 PID: 5107 Comm: syz-executor.1 Not tainted 6.2.0-rc3-next-20230112-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:306 [inline]
 print_report+0x15e/0x45d mm/kasan/report.c:417
 kasan_report+0xc0/0xf0 mm/kasan/report.c:517
 __wake_up_common+0x637/0x650 kernel/sched/wait.c:100
 __wake_up_common_lock+0xd4/0x140 kernel/sched/wait.c:138
 __wake_up kernel/sched/wait.c:160 [inline]
 __wake_up_pollfree+0x1d/0x60 kernel/sched/wait.c:246
 wake_up_pollfree include/linux/wait.h:271 [inline]
 signalfd_cleanup+0x46/0x60 fs/signalfd.c:38
 __cleanup_sighand kernel/fork.c:1688 [inline]
 __cleanup_sighand+0x76/0xb0 kernel/fork.c:1685
 __exit_signal kernel/exit.c:209 [inline]
 release_task+0xbfa/0x1870 kernel/exit.c:255
 wait_task_zombie kernel/exit.c:1198 [inline]
 wait_consider_task+0x306d/0x3ce0 kernel/exit.c:1425
 do_wait_thread kernel/exit.c:1488 [inline]
 do_wait+0x7cd/0xd90 kernel/exit.c:1605
 kernel_wait4+0x150/0x260 kernel/exit.c:1768
 __do_sys_wait4+0x13f/0x150 kernel/exit.c:1796
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f9ebaa89ca7
Code: 89 7c 24 10 48 89 4c 24 18 e8 f5 58 02 00 4c 8b 54 24 18 8b 54 24 14 41 89 c0 48 8b 74 24 08 8b 7c 24 10 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 89 44 24 10 e8 25 59 02 00 8b 44
RSP: 002b:00007ffeeccf7a00 EFLAGS: 00000293 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 00000000000004ed RCX: 00007f9ebaa89ca7
RDX: 0000000040000001 RSI: 00007ffeeccf7a8c RDI: 00000000ffffffff
RBP: 00007ffeeccf7a8c R08: 0000000000000000 R09: 00007ffeecd04080
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032
R13: 000000000014a24b R14: 0000000000000009 R15: 00007ffeeccf7af0
 </TASK>

Allocated by task 14307:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 __kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:325
 kasan_slab_alloc include/linux/kasan.h:186 [inline]
 slab_post_alloc_hook mm/slab.h:769 [inline]
 kmem_cache_alloc_bulk+0x3aa/0x730 mm/slub.c:4033
 __io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062
 io_alloc_req_refill io_uring/io_uring.h:348 [inline]
 io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407
 __do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 7102:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518
 ____kasan_slab_free mm/kasan/common.c:236 [inline]
 ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
 kasan_slab_free include/linux/kasan.h:162 [inline]
 slab_free_hook mm/slub.c:1781 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
 slab_free mm/slub.c:3787 [inline]
 kmem_cache_free+0xec/0x4e0 mm/slub.c:3809
 io_req_caches_free+0x1a9/0x1e6 io_uring/io_uring.c:2737
 io_ring_exit_work+0x2e7/0xc80 io_uring/io_uring.c:2967
 process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293
 worker_thread+0x669/0x1090 kernel/workqueue.c:2440
 kthread+0x2e8/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

The buggy address belongs to the object at ffff88801e01a640
 which belongs to the cache io_kiocb of size 216
The buggy address is located 48 bytes inside of
 216-byte region [ffff88801e01a640, ffff88801e01a718)

The buggy address belongs to the physical page:
page:ffffea0000780680 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1e01a
memcg:ffff88805bc0e181
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffff8881463d08c0 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800c000c 00000001ffffffff ffff88805bc0e181
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 14248, tgid 14247 (syz-executor.3), ts 1289791586052, free_ts 1289735316431
 prep_new_page mm/page_alloc.c:2549 [inline]
 get_page_from_freelist+0x11bb/0x2d50 mm/page_alloc.c:4324
 __alloc_pages+0x1cb/0x5c0 mm/page_alloc.c:5590
 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2281
 alloc_slab_page mm/slub.c:1851 [inline]
 allocate_slab+0x25f/0x350 mm/slub.c:1998
 new_slab mm/slub.c:2051 [inline]
 ___slab_alloc+0xa91/0x1400 mm/slub.c:3193
 __kmem_cache_alloc_bulk mm/slub.c:3951 [inline]
 kmem_cache_alloc_bulk+0x23d/0x730 mm/slub.c:4026
 __io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062
 io_alloc_req_refill io_uring/io_uring.h:348 [inline]
 io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407
 __do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1451 [inline]
 free_pcp_prepare+0x4d0/0x910 mm/page_alloc.c:1501
 free_unref_page_prepare mm/page_alloc.c:3387 [inline]
 free_unref_page+0x1d/0x490 mm/page_alloc.c:3482
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:302
 kasan_slab_alloc include/linux/kasan.h:186 [inline]
 slab_post_alloc_hook mm/slab.h:769 [inline]
 slab_alloc_node mm/slub.c:3452 [inline]
 slab_alloc mm/slub.c:3460 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3467 [inline]
 kmem_cache_alloc+0x175/0x320 mm/slub.c:3476
 getname_flags.part.0+0x50/0x4f0 fs/namei.c:140
 getname_flags+0x9e/0xe0 include/linux/audit.h:320
 user_path_at_empty+0x2f/0x60 fs/namei.c:2876
 do_readlinkat+0xcd/0x2f0 fs/stat.c:477
 __do_sys_readlink fs/stat.c:510 [inline]
 __se_sys_readlink fs/stat.c:507 [inline]
 __x64_sys_readlink+0x78/0xb0 fs/stat.c:507
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff88801e01a500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801e01a580: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
>ffff88801e01a600: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
                                                             ^
 ffff88801e01a680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801e01a700: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
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