RAX: ffffffffffffffda RBX: 00007efd74ad3f60 RCX: 00007efd749cf8d9
RDX: 0000000000000000 RSI: 00000000000002ff RDI: 0000000000000003
RBP: 00007efd727471d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe823712ef R14: 00007efd72747300 R15: 0000000000022000
==================================================================
BUG: KASAN: use-after-free in io_queue_sqe fs/io_uring.c:2514 [inline]
BUG: KASAN: use-after-free in io_queue_link_head+0x37a/0x5c0 fs/io_uring.c:2529
Read of size 8 at addr ffff8881e2cecf50 by task syz-executor.4/16413

CPU: 0 PID: 16413 Comm: syz-executor.4 Not tainted 5.4.125-syzkaller-00029-g12806d81361b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d8/0x24e lib/dump_stack.c:118
 print_address_description+0x9b/0x650 mm/kasan/report.c:384
 __kasan_report+0x182/0x260 mm/kasan/report.c:516
 kasan_report+0x30/0x60 mm/kasan/common.c:653
 io_queue_sqe fs/io_uring.c:2514 [inline]
 io_queue_link_head+0x37a/0x5c0 fs/io_uring.c:2529
 io_ring_submit fs/io_uring.c:2971 [inline]
 __do_sys_io_uring_enter fs/io_uring.c:3853 [inline]
 __se_sys_io_uring_enter+0xbd6/0x1e50 fs/io_uring.c:3814
 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7efd749cf8d9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007efd72747188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 00007efd74ad3f60 RCX: 00007efd749cf8d9
RDX: 0000000000000000 RSI: 00000000000002ff RDI: 0000000000000003
RBP: 00007efd727471d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe823712ef R14: 00007efd72747300 R15: 0000000000022000

Allocated by task 16413:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 __kasan_kmalloc+0x137/0x1e0 mm/kasan/common.c:529
 slab_post_alloc_hook mm/slab.h:584 [inline]
 kmem_cache_alloc_bulk+0x18e/0x290 mm/slub.c:3283
 io_get_req+0x17a/0x590 fs/io_uring.c:652
 io_submit_sqe+0x83/0xe80 fs/io_uring.c:2579
 io_ring_submit fs/io_uring.c:2967 [inline]
 __do_sys_io_uring_enter fs/io_uring.c:3853 [inline]
 __se_sys_io_uring_enter+0x8b6/0x1e50 fs/io_uring.c:3814
 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 16413:
 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+0x18a/0x240 mm/kasan/common.c:487
 slab_free_hook mm/slub.c:1454 [inline]
 slab_free_freelist_hook+0x7b/0x150 mm/slub.c:1492
 slab_free mm/slub.c:3072 [inline]
 kmem_cache_free+0xb8/0x5f0 mm/slub.c:3088
 io_queue_sqe fs/io_uring.c:2513 [inline]
 io_queue_link_head+0x364/0x5c0 fs/io_uring.c:2529
 io_ring_submit fs/io_uring.c:2971 [inline]
 __do_sys_io_uring_enter fs/io_uring.c:3853 [inline]
 __se_sys_io_uring_enter+0xbd6/0x1e50 fs/io_uring.c:3814
 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff8881e2cecf00
 which belongs to the cache io_kiocb of size 264
The buggy address is located 80 bytes inside of
 264-byte region [ffff8881e2cecf00, ffff8881e2ced008)
The buggy address belongs to the page:
page:ffffea00078b3b00 refcount:1 mapcount:0 mapping:ffff8881f0ecd900 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 ffffea00079d5880 0000000a0000000a ffff8881f0ecd900
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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2165 [inline]
 prep_new_page+0x19a/0x380 mm/page_alloc.c:2171
 get_page_from_freelist+0x550/0x8b0 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x3a2/0x880 mm/page_alloc.c:4855
 alloc_slab_page+0x39/0x3e0 mm/slub.c:342
 allocate_slab mm/slub.c:1675 [inline]
 new_slab+0x97/0x460 mm/slub.c:1741
 new_slab_objects mm/slub.c:2498 [inline]
 ___slab_alloc+0x330/0x4c0 mm/slub.c:2659
 kmem_cache_alloc_bulk+0xc7/0x290 mm/slub.c:3257
 io_get_req+0x17a/0x590 fs/io_uring.c:652
 io_submit_sqe+0x83/0xe80 fs/io_uring.c:2579
 io_ring_submit fs/io_uring.c:2967 [inline]
 __do_sys_io_uring_enter fs/io_uring.c:3853 [inline]
 __se_sys_io_uring_enter+0x8b6/0x1e50 fs/io_uring.c:3814
 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1176 [inline]
 __free_pages_ok+0xc60/0xd80 mm/page_alloc.c:1438
 free_the_page mm/page_alloc.c:4917 [inline]
 __free_pages+0x8f/0x250 mm/page_alloc.c:4923
 __free_slab+0x237/0x2f0 mm/slub.c:1766
 free_slab mm/slub.c:1781 [inline]
 discard_slab mm/slub.c:1787 [inline]
 unfreeze_partials+0x14f/0x180 mm/slub.c:2279
 put_cpu_partial+0xb5/0x150 mm/slub.c:2315
 __slab_free mm/slub.c:2963 [inline]
 do_slab_free mm/slub.c:3060 [inline]
 ___cache_free+0x352/0x4e0 mm/slub.c:3079
 qlist_free_all mm/kasan/quarantine.c:167 [inline]
 quarantine_reduce+0x17a/0x1e0 mm/kasan/quarantine.c:260
 __kasan_kmalloc+0x43/0x1e0 mm/kasan/common.c:507
 slab_post_alloc_hook mm/slab.h:584 [inline]
 slab_alloc_node mm/slub.c:2821 [inline]
 slab_alloc mm/slub.c:2829 [inline]
 kmem_cache_alloc+0x115/0x290 mm/slub.c:2834
 getname_flags+0xba/0x640 fs/namei.c:141
 user_path_at_empty+0x28/0x50 fs/namei.c:2683
 user_path_at include/linux/namei.h:49 [inline]
 vfs_statx fs/stat.c:187 [inline]
 vfs_stat include/linux/fs.h:3356 [inline]
 __do_sys_newstat fs/stat.c:341 [inline]
 __se_sys_newstat+0xe4/0x860 fs/stat.c:337
 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Memory state around the buggy address:
 ffff8881e2cece00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881e2cece80: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881e2cecf00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff8881e2cecf80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881e2ced000: fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================