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    Subject[syzbot] KASAN: use-after-free Read in io_poll_task_func
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    Hello,

    syzbot found the following issue on:

    HEAD commit: 0a093b2893c7 Add linux-next specific files for 20230112
    git tree: linux-next
    console output: https://syzkaller.appspot.com/x/log.txt?x=12fcd936480000
    kernel config: https://syzkaller.appspot.com/x/.config?x=835f3591019836d5
    dashboard link: https://syzkaller.appspot.com/bug?extid=cb95143d1d4d788c1941
    compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

    Unfortunately, I don't have any reproducer for this issue yet.

    Downloadable assets:
    disk image: https://storage.googleapis.com/syzbot-assets/8111a570d6cb/disk-0a093b28.raw.xz
    vmlinux: https://storage.googleapis.com/syzbot-assets/ecc135b7fc9a/vmlinux-0a093b28.xz
    kernel image: https://storage.googleapis.com/syzbot-assets/ca8d73b446ea/bzImage-0a093b28.xz

    IMPORTANT: if you fix the issue, please add the following tag to the commit:
    Reported-by: syzbot+cb95143d1d4d788c1941@syzkaller.appspotmail.com

    ==================================================================
    BUG: KASAN: use-after-free in io_poll_check_events io_uring/poll.c:244 [inline]
    BUG: KASAN: use-after-free in io_poll_task_func+0xf77/0x1220 io_uring/poll.c:327
    Read of size 4 at addr ffff888085e21d6c by task kworker/1:8/5241

    CPU: 1 PID: 5241 Comm: kworker/1:8 Not tainted 6.2.0-rc3-next-20230112-syzkaller #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
    Workqueue: events io_fallback_req_func
    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
    io_poll_check_events io_uring/poll.c:244 [inline]
    io_poll_task_func+0xf77/0x1220 io_uring/poll.c:327
    io_fallback_req_func+0xfd/0x204 io_uring/io_uring.c:252
    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
    </TASK>

    Allocated by task 22336:
    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]
    slab_alloc_node mm/slub.c:3452 [inline]
    kmem_cache_alloc_node+0x183/0x350 mm/slub.c:3497
    alloc_task_struct_node kernel/fork.c:171 [inline]
    dup_task_struct kernel/fork.c:979 [inline]
    copy_process+0x3aa/0x7740 kernel/fork.c:2103
    kernel_clone+0xeb/0x9a0 kernel/fork.c:2687
    __do_sys_clone+0xba/0x100 kernel/fork.c:2828
    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 5241:
    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
    put_task_struct_many include/linux/sched/task.h:125 [inline]
    __io_put_task+0x155/0x1e0 io_uring/io_uring.c:725
    io_put_task io_uring/io_uring.h:328 [inline]
    __io_req_complete_post+0x7ac/0xcd0 io_uring/io_uring.c:978
    io_req_complete_post+0xf1/0x1a0 io_uring/io_uring.c:992
    io_req_task_complete+0x189/0x260 io_uring/io_uring.c:1623
    io_poll_task_func+0xa95/0x1220 io_uring/poll.c:347
    io_fallback_req_func+0xfd/0x204 io_uring/io_uring.c:252
    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

    Last potentially related work creation:
    kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
    __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488
    __call_rcu_common.constprop.0+0x99/0x780 kernel/rcu/tree.c:2622
    put_task_struct_rcu_user+0x83/0xc0 kernel/exit.c:231
    context_switch kernel/sched/core.c:5304 [inline]
    __schedule+0x25d8/0x5a70 kernel/sched/core.c:6619
    preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6788
    preempt_schedule_thunk+0x1a/0x20 arch/x86/entry/thunk_64.S:34
    __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
    _raw_spin_unlock_irq+0x40/0x50 kernel/locking/spinlock.c:202
    spin_unlock_irq include/linux/spinlock.h:400 [inline]
    do_group_exit+0x1c5/0x2a0 kernel/exit.c:1009
    __do_sys_exit_group kernel/exit.c:1023 [inline]
    __se_sys_exit_group kernel/exit.c:1021 [inline]
    __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1021
    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

    Second to last potentially related work creation:
    kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
    __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488
    __call_rcu_common.constprop.0+0x99/0x780 kernel/rcu/tree.c:2622
    put_task_struct_rcu_user+0x83/0xc0 kernel/exit.c:231
    release_task+0xcc8/0x1870 kernel/exit.c:281
    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

    The buggy address belongs to the object at ffff888085e21d40
    which belongs to the cache task_struct of size 7232
    The buggy address is located 44 bytes inside of
    7232-byte region [ffff888085e21d40, ffff888085e23980)

    The buggy address belongs to the physical page:
    page:ffffea0002178800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x85e20
    head:ffffea0002178800 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
    memcg:ffff88802a511441
    anon flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
    raw: 00fff00000010200 ffff8880125ec500 0000000000000000 0000000000000001
    raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88802a511441
    page dumped because: kasan: bad access detected
    page_owner tracks the page as allocated
    page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5140, tgid 5140 (syz-executor.4), ts 940002279505, free_ts 939439685406
    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
    __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292
    __slab_alloc_node mm/slub.c:3345 [inline]
    slab_alloc_node mm/slub.c:3442 [inline]
    kmem_cache_alloc_node+0x136/0x350 mm/slub.c:3497
    alloc_task_struct_node kernel/fork.c:171 [inline]
    dup_task_struct kernel/fork.c:979 [inline]
    copy_process+0x3aa/0x7740 kernel/fork.c:2103
    kernel_clone+0xeb/0x9a0 kernel/fork.c:2687
    __do_sys_clone+0xba/0x100 kernel/fork.c:2828
    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
    __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2637
    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 include/linux/audit.h:320 [inline]
    getname+0x92/0xd0 fs/namei.c:219
    do_sys_openat2+0xf5/0x4c0 fs/open.c:1305
    do_sys_open fs/open.c:1327 [inline]
    __do_sys_openat fs/open.c:1343 [inline]
    __se_sys_openat fs/open.c:1338 [inline]
    __x64_sys_openat+0x143/0x1f0 fs/open.c:1338
    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:
    ffff888085e21c00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
    ffff888085e21c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
    >ffff888085e21d00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
    ^
    ffff888085e21d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
    ffff888085e21e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
    ==================================================================


    ---
    This report is generated by a bot. It may contain errors.
    See https://goo.gl/tpsmEJ for more information about syzbot.
    syzbot engineers can be reached at syzkaller@googlegroups.com.

    syzbot will keep track of this issue. See:
    https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

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