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BUG: KASAN: double-free or invalid-free in io_sqe_files_unregister+0x1a0/0x2a0 fs/io_uring.c:3013

CPU: 1 PID: 7653 Comm: syz-executor.0 Not tainted 5.4.0-rc5+ #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+0x113/0x167 lib/dump_stack.c:113
 print_address_description.constprop.8.cold.10+0x9/0x31d mm/kasan/report.c:374
 kasan_report_invalid_free+0x64/0xa0 mm/kasan/report.c:468
 __kasan_slab_free+0x13a/0x150 mm/kasan/common.c:450
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480
 __cache_free mm/slab.c:3425 [inline]
 kfree+0x108/0x2c0 mm/slab.c:3756
 io_sqe_files_unregister+0x1a0/0x2a0 fs/io_uring.c:3013
 io_ring_ctx_free fs/io_uring.c:3825 [inline]
 io_ring_ctx_wait_and_kill+0x2ac/0x610 fs/io_uring.c:3887
 io_uring_release+0x3d/0x50 fs/io_uring.c:3895
 __fput+0x25a/0x770 fs/file_table.c:280
 ____fput+0x9/0x10 fs/file_table.c:313
 task_work_run+0x108/0x180 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x24e/0x2e0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x4e8/0x5d0 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413db1
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffd2c8cb990 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413db1
RDX: 0000001b2dd20000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 00007ffd2c8cba70 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 00000000007605e0 R15: 000000000075bf2c

Allocated by task 7655:
 save_stack+0x21/0x90 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc.constprop.9+0xc7/0xd0 mm/kasan/common.c:510
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524
 __do_kmalloc mm/slab.c:3655 [inline]
 __kmalloc+0x164/0x790 mm/slab.c:3664
 kmalloc_array include/linux/slab.h:618 [inline]
 kcalloc include/linux/slab.h:629 [inline]
 io_sqe_files_register fs/io_uring.c:3201 [inline]
 __io_uring_register+0xb1c/0x2f30 fs/io_uring.c:4297
 __do_sys_io_uring_register fs/io_uring.c:4349 [inline]
 __se_sys_io_uring_register fs/io_uring.c:4331 [inline]
 __x64_sys_io_uring_register+0x162/0x460 fs/io_uring.c:4331
 do_syscall_64+0xca/0x5d0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 7655:
 save_stack+0x21/0x90 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 kasan_set_free_info mm/kasan/common.c:332 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:471
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480
 __cache_free mm/slab.c:3425 [inline]
 kfree+0x108/0x2c0 mm/slab.c:3756
 io_sqe_files_register fs/io_uring.c:3207 [inline]
 __io_uring_register+0xc9b/0x2f30 fs/io_uring.c:4297
 __do_sys_io_uring_register fs/io_uring.c:4349 [inline]
 __se_sys_io_uring_register fs/io_uring.c:4331 [inline]
 __x64_sys_io_uring_register+0x162/0x460 fs/io_uring.c:4331
 do_syscall_64+0xca/0x5d0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff888097814080
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
 32-byte region [ffff888097814080, ffff8880978140a0)
The buggy address belongs to the page:
page:ffffea00025e0500 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff888097814fc1
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea0002825bc8 ffffea00025dd308 ffff8880aa4001c0
raw: ffff888097814fc1 ffff888097814000 000000010000003f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888097813f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888097814000: 00 00 00 fc fc fc fc fc fb fb fb fb fc fc fc fc
>ffff888097814080: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
                   ^
 ffff888097814100: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff888097814180: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
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