do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
==================================================================
BUG: KASAN: use-after-free in io_queue_link_head+0x2d0/0x3d0 fs/io_uring.c:2551
Read of size 8 at addr ffff8881d911aad0 by task syz-executor.0/419

CPU: 1 PID: 419 Comm: syz-executor.0 Not tainted 5.4.265-syzkaller-04832-g4d7b888b5774 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d8/0x241 lib/dump_stack.c:118
 print_address_description+0x8c/0x600 mm/kasan/report.c:384
 __kasan_report+0xf3/0x120 mm/kasan/report.c:516
 kasan_report+0x30/0x60 mm/kasan/common.c:653
 io_queue_link_head+0x2d0/0x3d0 fs/io_uring.c:2551
 io_ring_submit fs/io_uring.c:2980 [inline]
 __do_sys_io_uring_enter fs/io_uring.c:3761 [inline]
 __se_sys_io_uring_enter+0xc35/0x2030 fs/io_uring.c:3722
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Allocated by task 419:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529
 slab_post_alloc_hook mm/slab.h:584 [inline]
 kmem_cache_alloc_bulk+0x1d3/0x2f0 mm/slub.c:3291
 io_get_req+0x16a/0x580 fs/io_uring.c:669
 io_submit_sqe+0x84/0xe90 fs/io_uring.c:2588
 io_ring_submit fs/io_uring.c:2976 [inline]
 __do_sys_io_uring_enter fs/io_uring.c:3761 [inline]
 __se_sys_io_uring_enter+0x8e8/0x2030 fs/io_uring.c:3722
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Freed by task 419:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 kasan_set_free_info mm/kasan/common.c:345 [inline]
 __kasan_slab_free+0x1b5/0x270 mm/kasan/common.c:487
 slab_free_hook mm/slub.c:1455 [inline]
 slab_free_freelist_hook mm/slub.c:1494 [inline]
 slab_free mm/slub.c:3080 [inline]
 kmem_cache_free+0x10b/0x2c0 mm/slub.c:3096
 io_queue_link_head+0x2b2/0x3d0 fs/io_uring.c:2549
 io_ring_submit fs/io_uring.c:2980 [inline]
 __do_sys_io_uring_enter fs/io_uring.c:3761 [inline]
 __se_sys_io_uring_enter+0xc35/0x2030 fs/io_uring.c:3722
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

The buggy address belongs to the object at ffff8881d911aa80
 which belongs to the cache io_kiocb of size 264
The buggy address is located 80 bytes inside of
 264-byte region [ffff8881d911aa80, ffff8881d911ab88)
The buggy address belongs to the page:
page:ffffea0007644680 refcount:1 mapcount:0 mapping:ffff8881f0f56500 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f0f56500
raw: 0000000000000000 0000000080150015 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2165 [inline]
 prep_new_page+0x18f/0x370 mm/page_alloc.c:2171
 get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4891
 alloc_slab_page+0x39/0x3c0 mm/slub.c:343
 allocate_slab mm/slub.c:1683 [inline]
 new_slab+0x97/0x440 mm/slub.c:1749
 new_slab_objects mm/slub.c:2505 [inline]
 ___slab_alloc+0x2fe/0x490 mm/slub.c:2667
 kmem_cache_alloc_bulk+0xe6/0x2f0 mm/slub.c:3265
 io_get_req+0x16a/0x580 fs/io_uring.c:669
 io_submit_sqe+0x84/0xe90 fs/io_uring.c:2588
 io_ring_submit fs/io_uring.c:2976 [inline]
 __do_sys_io_uring_enter fs/io_uring.c:3761 [inline]
 __se_sys_io_uring_enter+0x8e8/0x2030 fs/io_uring.c:3722
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8881d911a980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881d911aa00: fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881d911aa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff8881d911ab00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881d911ab80: fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================