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BUG: KASAN: use-after-free in radix_tree_next_slot include/linux/radix-tree.h:422 [inline]
BUG: KASAN: use-after-free in idr_for_each+0x206/0x220 lib/idr.c:202
Read of size 8 at addr ffff8880685798b8 by task syz-executor.0/11061

CPU: 0 PID: 11061 Comm: syz-executor.0 Not tainted 5.10.0-rc4-syzkaller #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+0x107/0x163 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:385
 __kasan_report mm/kasan/report.c:545 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:562
 radix_tree_next_slot include/linux/radix-tree.h:422 [inline]
 idr_for_each+0x206/0x220 lib/idr.c:202
 io_ring_ctx_wait_and_kill+0x12e/0x450 fs/io_uring.c:8395
 io_uring_release+0x3e/0x50 fs/io_uring.c:8420
 __fput+0x285/0x920 fs/file_table.c:281
 task_work_run+0xdd/0x190 kernel/task_work.c:151
 exit_task_work include/linux/task_work.h:30 [inline]
 do_exit+0xb64/0x29b0 kernel/exit.c:809
 do_group_exit+0x125/0x310 kernel/exit.c:906
 get_signal+0x428/0x1f00 kernel/signal.c:2758
 arch_do_signal+0x82/0x2390 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:161 [inline]
 exit_to_user_mode_prepare+0x100/0x1a0 kernel/entry/common.c:191
 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:266
 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:289
RIP: 0033:0x460889
Code: Unable to access opcode bytes at RIP 0x46085f.
RSP: 002b:00007fd0bb97fdb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000038
RAX: 0000000000000000 RBX: 00007fd0bb980700 RCX: 0000000000460889
RDX: 00007fd0bb9809d0 RSI: 00007fd0bb97fdb0 RDI: 00000000003d0f00
RBP: 00007fff89255570 R08: 00007fd0bb980700 R09: 00007fd0bb980700
R10: 00007fd0bb9809d0 R11: 0000000000000202 R12: 0000000000000000
R13: 00007fff8925540f R14: 00007fd0bb9809c0 R15: 000000000118bfd4

Allocated by task 11057:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
 slab_post_alloc_hook mm/slab.h:526 [inline]
 slab_alloc mm/slab.c:3314 [inline]
 kmem_cache_alloc+0x124/0x500 mm/slab.c:3484
 radix_tree_node_alloc.constprop.0+0x7c/0x350 lib/radix-tree.c:274
 idr_get_free+0x4c5/0x940 lib/radix-tree.c:1504
 idr_alloc_u32+0x170/0x2d0 lib/idr.c:46
 idr_alloc_cyclic+0x102/0x230 lib/idr.c:125
 io_register_personality fs/io_uring.c:9471 [inline]
 __io_uring_register fs/io_uring.c:9700 [inline]
 __do_sys_io_uring_register+0x1203/0x40d0 fs/io_uring.c:9750
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 10605:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56
 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355
 __kasan_slab_free+0xd8/0x120 mm/kasan/common.c:422
 __cache_free mm/slab.c:3420 [inline]
 kmem_cache_free+0x53/0x190 mm/slab.c:3695
 rcu_do_batch kernel/rcu/tree.c:2476 [inline]
 rcu_core+0x5df/0xe80 kernel/rcu/tree.c:2711
 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298

Last call_rcu():
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_record_aux_stack+0x82/0xb0 mm/kasan/generic.c:346
 __call_rcu kernel/rcu/tree.c:2953 [inline]
 call_rcu+0xbb/0x700 kernel/rcu/tree.c:3027
 radix_tree_node_free lib/radix-tree.c:308 [inline]
 delete_node+0x591/0x8c0 lib/radix-tree.c:571
 __radix_tree_delete+0x190/0x370 lib/radix-tree.c:1377
 radix_tree_delete_item+0xe7/0x230 lib/radix-tree.c:1428
 io_remove_personalities+0x1d/0x170 fs/io_uring.c:8351
 idr_for_each+0x113/0x220 lib/idr.c:208
 io_ring_ctx_wait_and_kill+0x12e/0x450 fs/io_uring.c:8395
 io_uring_release+0x3e/0x50 fs/io_uring.c:8420
 __fput+0x285/0x920 fs/file_table.c:281
 task_work_run+0xdd/0x190 kernel/task_work.c:151
 exit_task_work include/linux/task_work.h:30 [inline]
 do_exit+0xb64/0x29b0 kernel/exit.c:809
 do_group_exit+0x125/0x310 kernel/exit.c:906
 get_signal+0x428/0x1f00 kernel/signal.c:2758
 arch_do_signal+0x82/0x2390 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:161 [inline]
 exit_to_user_mode_prepare+0x100/0x1a0 kernel/entry/common.c:191
 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:266
 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:289

Second to last call_rcu():
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_record_aux_stack+0x82/0xb0 mm/kasan/generic.c:346
 __call_rcu kernel/rcu/tree.c:2953 [inline]
 call_rcu+0xbb/0x700 kernel/rcu/tree.c:3027
 xa_node_free lib/xarray.c:258 [inline]
 xas_delete_node lib/xarray.c:494 [inline]
 update_node lib/xarray.c:756 [inline]
 xas_store+0xbcc/0x1bb0 lib/xarray.c:841
 __xa_erase lib/xarray.c:1489 [inline]
 xa_erase+0xb0/0x170 lib/xarray.c:1510
 io_uring_del_task_file fs/io_uring.c:8734 [inline]
 __io_uring_files_cancel+0x10fd/0x1540 fs/io_uring.c:8770
 io_uring_files_cancel include/linux/io_uring.h:51 [inline]
 exit_files+0xe4/0x170 fs/file.c:456
 do_exit+0xb2a/0x29b0 kernel/exit.c:804
 do_group_exit+0x125/0x310 kernel/exit.c:906
 get_signal+0x428/0x1f00 kernel/signal.c:2758
 arch_do_signal+0x82/0x2390 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:161 [inline]
 exit_to_user_mode_prepare+0x100/0x1a0 kernel/entry/common.c:191
 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:266
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff888068579880
 which belongs to the cache radix_tree_node of size 576
The buggy address is located 56 bytes inside of
 576-byte region [ffff888068579880, ffff888068579ac0)
The buggy address belongs to the page:
page:0000000095669a30 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888068579ffb pfn:0x68579
flags: 0xfff00000000200(slab)
raw: 00fff00000000200 ffffea0001b88c08 ffffea0001a15e88 ffff88801006f000
raw: ffff888068579ffb ffff888068579040 0000000100000005 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888068579780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888068579800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888068579880: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff888068579900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888068579980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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