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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+0x1a8/0x1c4 lib/idr.c:202
Read of size 8 at addr ffff000039a439f8 by task syz-executor.1/22220

CPU: 1 PID: 22220 Comm: syz-executor.1 Not tainted 5.11.0-syzkaller-11646-g5695e5161974 #0
Hardware name: linux,dummy-virt (DT)
Call trace:
 dump_backtrace+0x0/0x3e0 arch/arm64/include/asm/pointer_auth.h:76
 show_stack+0x18/0x70 arch/arm64/kernel/stacktrace.c:191
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x110/0x188 lib/dump_stack.c:120
 print_address_description.constprop.0+0x2c/0x300 mm/kasan/report.c:232
 __kasan_report mm/kasan/report.c:399 [inline]
 kasan_report+0x1ec/0x200 mm/kasan/report.c:416
 __asan_report_load8_noabort+0x34/0x60 mm/kasan/report_generic.c:309
 radix_tree_next_slot include/linux/radix-tree.h:422 [inline]
 idr_for_each+0x1a8/0x1c4 lib/idr.c:202
 io_ring_ctx_wait_and_kill+0xdc/0x2d0 fs/io_uring.c:8567
 io_uring_release+0x34/0x54 fs/io_uring.c:8591
 __fput+0x1a0/0x6b0 fs/file_table.c:280
 ____fput+0x10/0x20 fs/file_table.c:313
 task_work_run+0xd4/0x20c kernel/task_work.c:140
 exit_task_work include/linux/task_work.h:30 [inline]
 do_exit+0x900/0x2290 kernel/exit.c:825
 do_group_exit+0xcc/0x23c kernel/exit.c:922
 get_signal+0x354/0x1924 kernel/signal.c:2773
 do_signal arch/arm64/kernel/signal.c:882 [inline]
 do_notify_resume+0x2b8/0x25fc arch/arm64/kernel/signal.c:936
 work_pending+0xc/0x35c

Allocated by task 22216:
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:121
 kasan_save_stack+0x28/0x60 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:427 [inline]
 __kasan_slab_alloc+0x60/0x84 mm/kasan/common.c:460
 kasan_slab_alloc include/linux/kasan.h:223 [inline]
 slab_post_alloc_hook mm/slab.h:516 [inline]
 slab_alloc_node mm/slub.c:2907 [inline]
 slab_alloc mm/slub.c:2915 [inline]
 kmem_cache_alloc+0x1c0/0x584 mm/slub.c:2920
 radix_tree_node_alloc.constprop.0+0xec/0x3a0 lib/radix-tree.c:274
 idr_get_free+0x2e8/0x910 lib/radix-tree.c:1504
 idr_alloc_u32+0x120/0x280 lib/idr.c:46
 idr_alloc_cyclic+0xe8/0x1b4 lib/idr.c:125
 io_register_personality fs/io_uring.c:9626 [inline]
 __io_uring_register fs/io_uring.c:9839 [inline]
 __do_sys_io_uring_register fs/io_uring.c:9891 [inline]
 __se_sys_io_uring_register fs/io_uring.c:9871 [inline]
 __arm64_sys_io_uring_register+0x7c0/0x3d60 fs/io_uring.c:9871
 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:49 [inline]
 el0_svc_common.constprop.0+0xf0/0x2c0 arch/arm64/kernel/syscall.c:129
 do_el0_svc+0xa4/0xd0 arch/arm64/kernel/syscall.c:168
 el0_svc+0x24/0x34 arch/arm64/kernel/entry-common.c:416
 el0_sync_handler+0x1a4/0x1b0 arch/arm64/kernel/entry-common.c:432
 el0_sync+0x170/0x180 arch/arm64/kernel/entry.S:699

Freed by task 18:
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:121
 kasan_save_stack+0x28/0x60 mm/kasan/common.c:38
 kasan_set_track+0x28/0x40 mm/kasan/common.c:46
 kasan_set_free_info+0x28/0x50 mm/kasan/generic.c:357
 ____kasan_slab_free mm/kasan/common.c:360 [inline]
 ____kasan_slab_free+0xfc/0x160 mm/kasan/common.c:325
 __kasan_slab_free+0x14/0x20 mm/kasan/common.c:367
 kasan_slab_free include/linux/kasan.h:199 [inline]
 slab_free_hook mm/slub.c:1562 [inline]
 slab_free_freelist_hook+0x8c/0x240 mm/slub.c:1600
 slab_free mm/slub.c:3161 [inline]
 kmem_cache_free+0xc4/0x56c mm/slub.c:3177
 radix_tree_node_rcu_free+0x78/0xb0 lib/radix-tree.c:302
 rcu_do_batch kernel/rcu/tree.c:2559 [inline]
 rcu_core+0xb8c/0x1880 kernel/rcu/tree.c:2794
 rcu_core_si+0x10/0x20 kernel/rcu/tree.c:2807
 _stext+0x2b4/0x1084

Last potentially related work creation:
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:121
 kasan_save_stack+0x28/0x60 mm/kasan/common.c:38
 kasan_record_aux_stack+0xf8/0x130 mm/kasan/generic.c:345
 __call_rcu kernel/rcu/tree.c:3039 [inline]
 call_rcu+0xb4/0x8d0 kernel/rcu/tree.c:3114
 radix_tree_node_free lib/radix-tree.c:308 [inline]
 delete_node+0x300/0x510 lib/radix-tree.c:571
 __radix_tree_delete+0x134/0x3dc lib/radix-tree.c:1377
 radix_tree_delete_item+0xbc/0x1bc lib/radix-tree.c:1428
 idr_remove+0x4c/0x6c lib/idr.c:154
 io_unregister_personality fs/io_uring.c:8498 [inline]
 io_remove_personalities+0x18/0xb0 fs/io_uring.c:8511
 idr_for_each+0xec/0x1c4 lib/idr.c:208
 io_ring_ctx_wait_and_kill+0xdc/0x2d0 fs/io_uring.c:8567
 io_uring_release+0x34/0x54 fs/io_uring.c:8591
 __fput+0x1a0/0x6b0 fs/file_table.c:280
 ____fput+0x10/0x20 fs/file_table.c:313
 task_work_run+0xd4/0x20c kernel/task_work.c:140
 exit_task_work include/linux/task_work.h:30 [inline]
 do_exit+0x900/0x2290 kernel/exit.c:825
 do_group_exit+0xcc/0x23c kernel/exit.c:922
 get_signal+0x354/0x1924 kernel/signal.c:2773
 do_signal arch/arm64/kernel/signal.c:882 [inline]
 do_notify_resume+0x2b8/0x25fc arch/arm64/kernel/signal.c:936
 work_pending+0xc/0x35c

Second to last potentially related work creation:
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:121
 kasan_save_stack+0x28/0x60 mm/kasan/common.c:38
 kasan_record_aux_stack+0xf8/0x130 mm/kasan/generic.c:345
 __call_rcu kernel/rcu/tree.c:3039 [inline]
 call_rcu+0xb4/0x8d0 kernel/rcu/tree.c:3114
 radix_tree_node_free lib/radix-tree.c:308 [inline]
 delete_node+0xd8/0x510 lib/radix-tree.c:571
 __radix_tree_delete+0x134/0x3dc lib/radix-tree.c:1377
 radix_tree_delete_item+0xbc/0x1bc lib/radix-tree.c:1428
 idr_remove+0x4c/0x6c lib/idr.c:154
 free_pid+0x8c/0x210 kernel/pid.c:152
 __change_pid+0x188/0x280 kernel/pid.c:353
 detach_pid+0x14/0x20 kernel/pid.c:358
 __unhash_process kernel/exit.c:78 [inline]
 __exit_signal kernel/exit.c:148 [inline]
 release_task+0xa80/0x12a0 kernel/exit.c:199
 wait_task_zombie kernel/exit.c:1107 [inline]
 wait_consider_task+0x21f0/0x3180 kernel/exit.c:1334
 do_wait_thread kernel/exit.c:1397 [inline]
 do_wait+0x2ac/0x840 kernel/exit.c:1468
 kernel_wait4+0xe4/0x270 kernel/exit.c:1630
 __do_sys_wait4+0xfc/0x1f0 kernel/exit.c:1658
 __se_sys_wait4 kernel/exit.c:1654 [inline]
 __arm64_sys_wait4+0x88/0xd0 kernel/exit.c:1654
 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:49 [inline]
 el0_svc_common.constprop.0+0xf0/0x2c0 arch/arm64/kernel/syscall.c:129
 do_el0_svc+0xa4/0xd0 arch/arm64/kernel/syscall.c:168
 el0_svc+0x24/0x34 arch/arm64/kernel/entry-common.c:416
 el0_sync_handler+0x1a4/0x1b0 arch/arm64/kernel/entry-common.c:432
 el0_sync+0x170/0x180 arch/arm64/kernel/entry.S:699

The buggy address belongs to the object at ffff000039a439c0
 which belongs to the cache radix_tree_node of size 576
The buggy address is located 56 bytes inside of
 576-byte region [ffff000039a439c0, ffff000039a43c00)
The buggy address belongs to the page:
page:000000003ff7fe22 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x79a40
head:000000003ff7fe22 order:2 compound_mapcount:0 compound_pincount:0
memcg:ffff000032a9c801
flags: 0x1ffc00000010200(slab|head)
raw: 01ffc00000010200 dead000000000100 dead000000000122 ffff00000c40c900
raw: 0000000000000000 0000000080170017 00000001ffffffff ffff000032a9c801
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff000039a43880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff000039a43900: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff000039a43980: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
                                                                ^
 ffff000039a43a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff000039a43a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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