================================================================== BUG: KASAN: use-after-free in io_wq_worker_running+0x114/0x130 io_uring/io-wq.c:674 Read of size 4 at addr ffff888020e9f404 by task iou-wrk-6429/6430 CPU: 1 PID: 6430 Comm: iou-wrk-6429 Not tainted 6.2.0-rc2-syzkaller-00256-ga689b938df39 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:306 [inline] print_report+0x15e/0x45d mm/kasan/report.c:417 kasan_report+0xbf/0x1f0 mm/kasan/report.c:517 io_wq_worker_running+0x114/0x130 io_uring/io-wq.c:674 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6690 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0xa48/0x1360 kernel/locking/mutex.c:747 io_ring_submit_lock io_uring/io_uring.h:215 [inline] io_poll_cancel+0x1ae/0x1e0 io_uring/poll.c:846 io_try_cancel+0x176/0x230 io_uring/cancel.c:97 __io_async_cancel+0xa0/0x3f0 io_uring/cancel.c:140 io_async_cancel+0x27a/0x480 io_uring/cancel.c:193 io_issue_sqe+0x156/0x1220 io_uring/io_uring.c:1856 io_wq_submit_work+0x29c/0xdc0 io_uring/io_uring.c:1932 io_worker_handle_work+0xc41/0x1c60 io_uring/io-wq.c:587 io_wqe_worker+0xa5b/0xe40 io_uring/io-wq.c:632 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Allocated by task 6429: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:380 kmalloc_node include/linux/slab.h:606 [inline] kzalloc_node include/linux/slab.h:731 [inline] create_io_worker+0x10c/0x630 io_uring/io-wq.c:801 io_wqe_create_worker io_uring/io-wq.c:310 [inline] io_wqe_enqueue+0x6c3/0xbc0 io_uring/io-wq.c:936 io_queue_iowq+0x282/0x5c0 io_uring/io_uring.c:475 io_queue_sqe_fallback+0xf3/0x190 io_uring/io_uring.c:2059 io_submit_sqe io_uring/io_uring.c:2281 [inline] io_submit_sqes+0x11db/0x1e60 io_uring/io_uring.c:2397 __do_sys_io_uring_enter+0xc1d/0x2540 io_uring/io_uring.c:3345 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 6430: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0xaf/0x3b0 mm/slub.c:3800 io_wq_cancel_tw_create io_uring/io-wq.c:1233 [inline] io_queue_worker_create+0x567/0x660 io_uring/io-wq.c:381 io_wqe_dec_running+0x1e4/0x240 io_uring/io-wq.c:410 io_wq_worker_sleeping+0xa6/0xc0 io_uring/io-wq.c:698 sched_submit_work kernel/sched/core.c:6597 [inline] schedule+0x16e/0x1b0 kernel/sched/core.c:6628 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6690 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0xa48/0x1360 kernel/locking/mutex.c:747 io_ring_submit_lock io_uring/io_uring.h:215 [inline] io_poll_cancel+0x1ae/0x1e0 io_uring/poll.c:846 io_try_cancel+0x176/0x230 io_uring/cancel.c:97 __io_async_cancel+0xa0/0x3f0 io_uring/cancel.c:140 io_async_cancel+0x27a/0x480 io_uring/cancel.c:193 io_issue_sqe+0x156/0x1220 io_uring/io_uring.c:1856 io_wq_submit_work+0x29c/0xdc0 io_uring/io_uring.c:1932 io_worker_handle_work+0xc41/0x1c60 io_uring/io-wq.c:587 io_wqe_worker+0xa5b/0xe40 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+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488 task_work_add+0x7f/0x2c0 kernel/task_work.c:48 io_queue_worker_create+0x41d/0x660 io_uring/io-wq.c:373 io_wqe_dec_running+0x1e4/0x240 io_uring/io-wq.c:410 io_wq_worker_sleeping+0xa6/0xc0 io_uring/io-wq.c:698 sched_submit_work kernel/sched/core.c:6597 [inline] schedule+0x16e/0x1b0 kernel/sched/core.c:6628 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6690 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0xa48/0x1360 kernel/locking/mutex.c:747 io_ring_submit_lock io_uring/io_uring.h:215 [inline] io_poll_cancel+0x1ae/0x1e0 io_uring/poll.c:846 io_try_cancel+0x176/0x230 io_uring/cancel.c:97 __io_async_cancel+0xa0/0x3f0 io_uring/cancel.c:140 io_async_cancel+0x27a/0x480 io_uring/cancel.c:193 io_issue_sqe+0x156/0x1220 io_uring/io_uring.c:1856 io_wq_submit_work+0x29c/0xdc0 io_uring/io_uring.c:1932 io_worker_handle_work+0xc41/0x1c60 io_uring/io-wq.c:587 io_wqe_worker+0xa5b/0xe40 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 ffff888020e9f400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 4 bytes inside of 512-byte region [ffff888020e9f400, ffff888020e9f600) The buggy address belongs to the physical page: page:ffffea000083a700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x20e9c head:ffffea000083a700 order:2 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 ksm flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888012441c80 ffffea000078b400 dead000000000003 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 0xd2000(__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 9022994950, free_ts 0 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0x119c/0x2ce0 mm/page_alloc.c:4283 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5549 alloc_page_interleave+0x1e/0x200 mm/mempolicy.c:2119 alloc_pages+0x233/0x270 mm/mempolicy.c:2281 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x25f/0x350 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3193 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292 __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0x1a4/0x430 mm/slub.c:3491 kmalloc_trace+0x26/0x60 mm/slab_common.c:1062 kmalloc include/linux/slab.h:580 [inline] usb_cache_string+0x62/0x150 drivers/usb/core/message.c:1027 usb_enumerate_device drivers/usb/core/hub.c:2415 [inline] usb_new_device+0x167/0x7b0 drivers/usb/core/hub.c:2543 register_root_hub+0x421/0x573 drivers/usb/core/hcd.c:1017 usb_add_hcd.cold+0x100c/0x13a1 drivers/usb/core/hcd.c:2991 dummy_hcd_probe+0x1a3/0x314 drivers/usb/gadget/udc/dummy_hcd.c:2676 platform_probe+0x100/0x1f0 drivers/base/platform.c:1400 call_driver_probe drivers/base/dd.c:560 [inline] really_probe+0x249/0xb90 drivers/base/dd.c:639 page_owner free stack trace missing Memory state around the buggy address: ffff888020e9f300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888020e9f380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888020e9f400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888020e9f480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888020e9f500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================