==================================================================
BUG: KASAN: use-after-free in io_wq_worker_running+0xfe/0x130 io_uring/io-wq.c:674
Read of size 4 at addr ffff88804c575c04 by task iou-wrk-20898/20912

CPU: 0 PID: 20912 Comm: iou-wrk-20898 Not tainted 6.2.0-rc3-syzkaller-00021-g7dd4b804e080 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
 print_address_description+0x74/0x340 mm/kasan/report.c:306
 print_report+0x107/0x220 mm/kasan/report.c:417
 kasan_report+0x139/0x170 mm/kasan/report.c:517
 io_wq_worker_running+0xfe/0x130 io_uring/io-wq.c:674
 io_schedule+0x83/0x100 kernel/sched/core.c:8811
 folio_wait_bit_common+0x8ca/0x1390 mm/filemap.c:1297
 folio_wait_writeback+0xf8/0x200 mm/page-writeback.c:3148
 __filemap_fdatawait_range+0x18c/0x6d0 mm/filemap.c:521
 filemap_write_and_wait_range+0x23a/0x2f0 mm/filemap.c:683
 __iomap_dio_rw+0xb1d/0x20d0 fs/iomap/direct-io.c:572
 iomap_dio_rw+0x42/0xa0 fs/iomap/direct-io.c:689
 ext4_dio_read_iter fs/ext4/file.c:94 [inline]
 ext4_file_read_iter+0x505/0x660 fs/ext4/file.c:145
 call_read_iter include/linux/fs.h:2183 [inline]
 io_iter_do_read io_uring/rw.c:643 [inline]
 io_read+0x4a8/0x1310 io_uring/rw.c:766
 io_issue_sqe+0x44e/0xcd0 io_uring/io_uring.c:1856
 io_wq_submit_work+0x44a/0x9c0 io_uring/io_uring.c:1932
 io_worker_handle_work+0x8e1/0xee0 io_uring/io-wq.c:587
 io_wqe_worker+0x36c/0xde0 io_uring/io-wq.c:632
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>

Allocated by task 20898:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x70 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:371 [inline]
 __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:380
 kmalloc_node include/linux/slab.h:606 [inline]
 kzalloc_node include/linux/slab.h:731 [inline]
 create_io_worker+0xef/0x630 io_uring/io-wq.c:801
 create_worker_cb+0x16b/0x330 io_uring/io-wq.c:339
 task_work_run+0x243/0x300 kernel/task_work.c:179
 get_signal+0x1654/0x1820 kernel/signal.c:2635
 arch_do_signal_or_restart+0x8d/0x5f0 arch/x86/kernel/signal.c:306
 exit_to_user_mode_loop+0x74/0x160 kernel/entry/common.c:168
 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:203
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 20912:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:518
 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1781 [inline]
 slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1807
 slab_free mm/slub.c:3787 [inline]
 __kmem_cache_free+0x71/0x110 mm/slub.c:3800
 io_wq_cancel_tw_create+0x77/0xd0 io_uring/io-wq.c:1233
 io_queue_worker_create+0x384/0x430 io_uring/io-wq.c:381
 sched_submit_work kernel/sched/core.c:6597 [inline]
 schedule+0x63/0x190 kernel/sched/core.c:6628
 io_schedule+0x83/0x100 kernel/sched/core.c:8811
 folio_wait_bit_common+0x8ca/0x1390 mm/filemap.c:1297
 folio_wait_writeback+0xf8/0x200 mm/page-writeback.c:3148
 __filemap_fdatawait_range+0x18c/0x6d0 mm/filemap.c:521
 filemap_write_and_wait_range+0x23a/0x2f0 mm/filemap.c:683
 __iomap_dio_rw+0xb1d/0x20d0 fs/iomap/direct-io.c:572
 iomap_dio_rw+0x42/0xa0 fs/iomap/direct-io.c:689
 ext4_dio_read_iter fs/ext4/file.c:94 [inline]
 ext4_file_read_iter+0x505/0x660 fs/ext4/file.c:145
 call_read_iter include/linux/fs.h:2183 [inline]
 io_iter_do_read io_uring/rw.c:643 [inline]
 io_read+0x4a8/0x1310 io_uring/rw.c:766
 io_issue_sqe+0x44e/0xcd0 io_uring/io_uring.c:1856
 io_wq_submit_work+0x44a/0x9c0 io_uring/io_uring.c:1932
 io_worker_handle_work+0x8e1/0xee0 io_uring/io-wq.c:587
 io_wqe_worker+0x36c/0xde0 io_uring/io-wq.c:632
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

Last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:488
 task_work_add+0x87/0x340 kernel/task_work.c:48
 io_queue_worker_create+0x1e2/0x430 io_uring/io-wq.c:373
 sched_submit_work kernel/sched/core.c:6597 [inline]
 schedule+0x63/0x190 kernel/sched/core.c:6628
 io_schedule+0x83/0x100 kernel/sched/core.c:8811
 folio_wait_bit_common+0x8ca/0x1390 mm/filemap.c:1297
 folio_wait_writeback+0xf8/0x200 mm/page-writeback.c:3148
 __filemap_fdatawait_range+0x18c/0x6d0 mm/filemap.c:521
 filemap_write_and_wait_range+0x23a/0x2f0 mm/filemap.c:683
 __iomap_dio_rw+0xb1d/0x20d0 fs/iomap/direct-io.c:572
 iomap_dio_rw+0x42/0xa0 fs/iomap/direct-io.c:689
 ext4_dio_read_iter fs/ext4/file.c:94 [inline]
 ext4_file_read_iter+0x505/0x660 fs/ext4/file.c:145
 call_read_iter include/linux/fs.h:2183 [inline]
 io_iter_do_read io_uring/rw.c:643 [inline]
 io_read+0x4a8/0x1310 io_uring/rw.c:766
 io_issue_sqe+0x44e/0xcd0 io_uring/io_uring.c:1856
 io_wq_submit_work+0x44a/0x9c0 io_uring/io_uring.c:1932
 io_worker_handle_work+0x8e1/0xee0 io_uring/io-wq.c:587
 io_wqe_worker+0x36c/0xde0 io_uring/io-wq.c:632
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

Second to last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:488
 task_work_add+0x87/0x340 kernel/task_work.c:48
 io_queue_worker_create+0x1e2/0x430 io_uring/io-wq.c:373
 sched_submit_work kernel/sched/core.c:6597 [inline]
 schedule+0x63/0x190 kernel/sched/core.c:6628
 io_schedule+0x83/0x100 kernel/sched/core.c:8811
 folio_wait_bit_common+0x8ca/0x1390 mm/filemap.c:1297
 folio_wait_writeback+0xf8/0x200 mm/page-writeback.c:3148
 __filemap_fdatawait_range+0x18c/0x6d0 mm/filemap.c:521
 filemap_write_and_wait_range+0x23a/0x2f0 mm/filemap.c:683
 __iomap_dio_rw+0xb1d/0x20d0 fs/iomap/direct-io.c:572
 iomap_dio_rw+0x42/0xa0 fs/iomap/direct-io.c:689
 ext4_dio_read_iter fs/ext4/file.c:94 [inline]
 ext4_file_read_iter+0x505/0x660 fs/ext4/file.c:145
 call_read_iter include/linux/fs.h:2183 [inline]
 io_iter_do_read io_uring/rw.c:643 [inline]
 io_read+0x4a8/0x1310 io_uring/rw.c:766
 io_issue_sqe+0x44e/0xcd0 io_uring/io_uring.c:1856
 io_wq_submit_work+0x44a/0x9c0 io_uring/io_uring.c:1932
 io_worker_handle_work+0x8e1/0xee0 io_uring/io-wq.c:587
 io_wqe_worker+0x36c/0xde0 io_uring/io-wq.c:632
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

The buggy address belongs to the object at ffff88804c575c00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 4 bytes inside of
 512-byte region [ffff88804c575c00, ffff88804c575e00)

The buggy address belongs to the physical page:
page:ffffea0001315d00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4c574
head:ffffea0001315d00 order:2 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffff888012841c80 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 20898, tgid 20893 (syz-executor.1), ts 1262530201444, free_ts 1229608786060
 prep_new_page mm/page_alloc.c:2531 [inline]
 get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4283
 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549
 alloc_slab_page+0xbd/0x190 mm/slub.c:1851
 allocate_slab+0x5e/0x3c0 mm/slub.c:1998
 new_slab mm/slub.c:2051 [inline]
 ___slab_alloc+0x7f4/0xeb0 mm/slub.c:3193
 __slab_alloc mm/slub.c:3292 [inline]
 __slab_alloc_node mm/slub.c:3345 [inline]
 slab_alloc_node mm/slub.c:3442 [inline]
 __kmem_cache_alloc_node+0x25b/0x340 mm/slub.c:3491
 __do_kmalloc_node mm/slab_common.c:967 [inline]
 __kmalloc+0x9e/0x190 mm/slab_common.c:981
 kmalloc include/linux/slab.h:584 [inline]
 io_alloc_async_data+0xaa/0x1b0 io_uring/io_uring.c:1712
 io_setup_async_rw+0xbd/0x470 io_uring/rw.c:524
 io_read+0x708/0x1310 io_uring/rw.c:797
 io_issue_sqe+0x44e/0xcd0 io_uring/io_uring.c:1856
 io_queue_sqe io_uring/io_uring.c:2028 [inline]
 io_submit_sqe io_uring/io_uring.c:2286 [inline]
 io_submit_sqes+0xa7f/0x1ba0 io_uring/io_uring.c:2397
 __do_sys_io_uring_enter io_uring/io_uring.c:3345 [inline]
 __se_sys_io_uring_enter+0x335/0x2540 io_uring/io_uring.c:3277
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1446 [inline]
 free_pcp_prepare+0x751/0x780 mm/page_alloc.c:1496
 free_unref_page_prepare mm/page_alloc.c:3369 [inline]
 free_unref_page+0x19/0x4c0 mm/page_alloc.c:3464
 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x156/0x170 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:302
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slab.h:761 [inline]
 slab_alloc_node mm/slub.c:3452 [inline]
 slab_alloc mm/slub.c:3460 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3467 [inline]
 kmem_cache_alloc+0x1b3/0x350 mm/slub.c:3476
 anon_vma_alloc mm/rmap.c:93 [inline]
 __anon_vma_prepare+0xb7/0x3f0 mm/rmap.c:202
 anon_vma_prepare include/linux/rmap.h:159 [inline]
 do_anonymous_page+0xdf4/0x10b0 mm/memory.c:4072
 handle_pte_fault mm/memory.c:4929 [inline]
 __handle_mm_fault mm/memory.c:5073 [inline]
 handle_mm_fault+0x1620/0x26c0 mm/memory.c:5219
 do_user_addr_fault+0x69b/0xcb0 arch/x86/mm/fault.c:1428
 handle_page_fault arch/x86/mm/fault.c:1519 [inline]
 exc_page_fault+0x7a/0x120 arch/x86/mm/fault.c:1575
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570

Memory state around the buggy address:
 ffff88804c575b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88804c575b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88804c575c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88804c575c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88804c575d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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