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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 ffff00002bc9f638 by task syz-executor.0/16726

CPU: 1 PID: 16726 Comm: syz-executor.0 Not tainted 5.11.0-rc5-syzkaller-00040-g76c057c84d28 #0
Hardware name: linux,dummy-virt (DT)
Call trace:
 dump_backtrace+0x0/0x3e0 arch/arm64/include/asm/pointer_auth.h:76
 show_stack+0x1c/0x70 arch/arm64/kernel/stacktrace.c:196
 __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:230
 __kasan_report mm/kasan/report.c:396 [inline]
 kasan_report+0x1e8/0x200 mm/kasan/report.c:413
 __asan_report_load8_noabort+0x38/0x6c 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+0x16c/0x4d0 fs/io_uring.c:8788
 io_uring_release+0x34/0x54 fs/io_uring.c:8813
 __fput+0x1a0/0x6ac fs/file_table.c:280
 ____fput+0x14/0x20 fs/file_table.c:313
 task_work_run+0xd8/0x210 kernel/task_work.c:140
 exit_task_work include/linux/task_work.h:30 [inline]
 do_exit+0x940/0x2330 kernel/exit.c:825
 do_group_exit+0xd0/0x240 kernel/exit.c:922
 get_signal+0x35c/0x1930 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 16726:
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:121
 kasan_save_stack+0x2c/0x5c mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:401 [inline]
 ____kasan_kmalloc.constprop.0+0x8c/0xb4 mm/kasan/common.c:429
 __kasan_slab_alloc+0x1c/0x30 mm/kasan/common.c:437
 kasan_slab_alloc include/linux/kasan.h:209 [inline]
 slab_post_alloc_hook mm/slab.h:512 [inline]
 slab_alloc_node mm/slub.c:2892 [inline]
 slab_alloc mm/slub.c:2900 [inline]
 kmem_cache_alloc+0x1cc/0x5c4 mm/slub.c:2905
 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:9862 [inline]
 __io_uring_register fs/io_uring.c:10091 [inline]
 __do_sys_io_uring_register fs/io_uring.c:10141 [inline]
 __se_sys_io_uring_register fs/io_uring.c:10123 [inline]
 __arm64_sys_io_uring_register+0x77c/0x3dac fs/io_uring.c:10123
 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:49 [inline]
 el0_svc_common.constprop.0+0x110/0x3c0 arch/arm64/kernel/syscall.c:159
 do_el0_svc_compat+0x44/0x7c arch/arm64/kernel/syscall.c:204
 el0_svc_compat+0x20/0x30 arch/arm64/kernel/entry-common.c:442
 el0_sync_compat_handler+0x94/0x150 arch/arm64/kernel/entry-common.c:451
 el0_sync_compat+0x178/0x180 arch/arm64/kernel/entry.S:708

Freed by task 16729:
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:121
 kasan_save_stack+0x2c/0x5c mm/kasan/common.c:38
 kasan_set_track+0x2c/0x40 mm/kasan/common.c:46
 kasan_set_free_info+0x2c/0x50 mm/kasan/generic.c:356
 ____kasan_slab_free+0xf0/0x154 mm/kasan/common.c:362
 __kasan_slab_free+0x18/0x24 mm/kasan/common.c:369
 kasan_slab_free include/linux/kasan.h:192 [inline]
 slab_free_hook mm/slub.c:1547 [inline]
 slab_free_freelist_hook+0x8c/0x240 mm/slub.c:1580
 slab_free mm/slub.c:3143 [inline]
 kmem_cache_free+0xc4/0x5a4 mm/slub.c:3159
 radix_tree_node_rcu_free+0x7c/0xb0 lib/radix-tree.c:302
 rcu_do_batch kernel/rcu/tree.c:2489 [inline]
 rcu_core+0x860/0xe10 kernel/rcu/tree.c:2723
 rcu_core_si+0x14/0x20 kernel/rcu/tree.c:2736
 _stext+0x404/0x10cc

Last potentially related work creation:
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:121
 kasan_save_stack+0x2c/0x5c mm/kasan/common.c:38
 kasan_record_aux_stack+0xfc/0x134 mm/kasan/generic.c:344
 __call_rcu kernel/rcu/tree.c:2965 [inline]
 call_rcu+0xf8/0x5f0 kernel/rcu/tree.c:3038
 radix_tree_node_free lib/radix-tree.c:308 [inline]
 delete_node+0x2fc/0x50c lib/radix-tree.c:571
 __radix_tree_delete+0x134/0x3dc lib/radix-tree.c:1377
 radix_tree_delete_item+0xbc/0x1c0 lib/radix-tree.c:1428
 idr_remove+0x50/0x70 lib/idr.c:154
 io_remove_personalities+0x1c/0x154 fs/io_uring.c:8733
 idr_for_each+0xec/0x1c4 lib/idr.c:208
 io_ring_ctx_wait_and_kill+0x16c/0x4d0 fs/io_uring.c:8788
 io_uring_release+0x34/0x54 fs/io_uring.c:8813
 __fput+0x1a0/0x6ac fs/file_table.c:280
 ____fput+0x14/0x20 fs/file_table.c:313
 task_work_run+0xd8/0x210 kernel/task_work.c:140
 exit_task_work include/linux/task_work.h:30 [inline]
 do_exit+0x940/0x2330 kernel/exit.c:825
 do_group_exit+0xd0/0x240 kernel/exit.c:922
 get_signal+0x35c/0x1930 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+0x2c/0x5c mm/kasan/common.c:38
 kasan_record_aux_stack+0xfc/0x134 mm/kasan/generic.c:344
 __call_rcu kernel/rcu/tree.c:2965 [inline]
 call_rcu+0xf8/0x5f0 kernel/rcu/tree.c:3038
 radix_tree_node_free lib/radix-tree.c:308 [inline]
 delete_node+0xd8/0x50c lib/radix-tree.c:571
 __radix_tree_delete+0x134/0x3dc lib/radix-tree.c:1377
 radix_tree_delete_item+0xbc/0x1c0 lib/radix-tree.c:1428
 idr_remove+0x50/0x70 lib/idr.c:154
 free_pid+0x90/0x214 kernel/pid.c:152
 __change_pid+0x188/0x27c kernel/pid.c:353
 detach_pid+0x18/0x24 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+0x2b4/0x894 kernel/exit.c:1468
 kernel_wait4+0xe4/0x270 kernel/exit.c:1630
 __do_compat_sys_wait4+0xf4/0x104 kernel/exit.c:1688
 __se_compat_sys_wait4 kernel/exit.c:1681 [inline]
 __arm64_compat_sys_wait4+0x8c/0xd0 kernel/exit.c:1681
 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:49 [inline]
 el0_svc_common.constprop.0+0x110/0x3c0 arch/arm64/kernel/syscall.c:159
 do_el0_svc_compat+0x44/0x7c arch/arm64/kernel/syscall.c:204
 el0_svc_compat+0x20/0x30 arch/arm64/kernel/entry-common.c:442
 el0_sync_compat_handler+0x94/0x150 arch/arm64/kernel/entry-common.c:451
 el0_sync_compat+0x178/0x180 arch/arm64/kernel/entry.S:708

The buggy address belongs to the object at ffff00002bc9f600
 which belongs to the cache radix_tree_node of size 576
The buggy address is located 56 bytes inside of
 576-byte region [ffff00002bc9f600, ffff00002bc9f840)
The buggy address belongs to the page:
page:0000000017ba43b4 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6bc9e
head:0000000017ba43b4 order:1 compound_mapcount:0
flags: 0x1ffc00000010200(slab|head)
raw: 01ffc00000010200 fffffc0000af7e80 0000000400000004 ffff00000c40ca80
raw: 0000000000000000 00000000000b000b 00000001ffffffff ffff00000f988301
page dumped because: kasan: bad access detected
pages's memcg:ffff00000f988301

Memory state around the buggy address:
 ffff00002bc9f500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff00002bc9f580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff00002bc9f600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff00002bc9f680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff00002bc9f700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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