================================================================== 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 ffff888077968b80 by task kworker/u4:4/154 CPU: 0 PID: 154 Comm: kworker/u4:4 Not tainted 5.10.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound io_ring_exit_work 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_destroy_buffers fs/io_uring.c:8249 [inline] io_ring_ctx_free fs/io_uring.c:8272 [inline] io_ring_exit_work+0x3f7/0x7a0 fs/io_uring.c:8349 process_one_work+0x933/0x15a0 kernel/workqueue.c:2272 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Allocated by task 19078: 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+0xc2/0x130 lib/idr.c:87 io_provide_buffers fs/io_uring.c:4016 [inline] io_issue_sqe+0x2fc4/0x3d10 fs/io_uring.c:5996 __io_queue_sqe+0x132/0xda0 fs/io_uring.c:6216 io_queue_sqe+0x623/0x11f0 fs/io_uring.c:6282 io_queue_link_head fs/io_uring.c:6293 [inline] io_submit_sqes+0xb78/0x28a0 fs/io_uring.c:6595 __do_sys_io_uring_enter+0xc8e/0x1ab0 fs/io_uring.c:8957 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 10: 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_buffers fs/io_uring.c:3914 [inline] __io_remove_buffers fs/io_uring.c:3893 [inline] __io_destroy_buffers+0x161/0x200 fs/io_uring.c:8243 idr_for_each+0x113/0x220 lib/idr.c:208 io_destroy_buffers fs/io_uring.c:8249 [inline] io_ring_ctx_free fs/io_uring.c:8272 [inline] io_ring_exit_work+0x3f7/0x7a0 fs/io_uring.c:8349 process_one_work+0x933/0x15a0 kernel/workqueue.c:2272 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 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:8707 [inline] __io_uring_files_cancel+0x10fd/0x1540 fs/io_uring.c:8743 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 ffff888077968b40 which belongs to the cache radix_tree_node of size 576 The buggy address is located 64 bytes inside of 576-byte region [ffff888077968b40, ffff888077968d80) The buggy address belongs to the page: page:0000000061500047 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888077968ffb pfn:0x77968 flags: 0xfff00000000200(slab) raw: 00fff00000000200 ffffea0001de41c8 ffffea0001deb888 ffff88801006f000 raw: ffff888077968ffb ffff888077968040 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888077968a80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888077968b00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb >ffff888077968b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888077968c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888077968c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================