================================================================== BUG: KASAN: use-after-free in __wake_up_common+0x637/0x650 kernel/sched/wait.c:100 Read of size 8 at addr ffff88802daae7b0 by task syz-executor.2/5121 CPU: 1 PID: 5121 Comm: syz-executor.2 Not tainted 6.2.0-rc3-next-20230112-syzkaller #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+0xc0/0xf0 mm/kasan/report.c:517 __wake_up_common+0x637/0x650 kernel/sched/wait.c:100 __wake_up_common_lock+0xd4/0x140 kernel/sched/wait.c:138 __wake_up kernel/sched/wait.c:160 [inline] __wake_up_pollfree+0x1d/0x60 kernel/sched/wait.c:246 wake_up_pollfree include/linux/wait.h:271 [inline] signalfd_cleanup+0x46/0x60 fs/signalfd.c:38 __cleanup_sighand kernel/fork.c:1688 [inline] __cleanup_sighand+0x76/0xb0 kernel/fork.c:1685 __exit_signal kernel/exit.c:209 [inline] release_task+0xbfa/0x1870 kernel/exit.c:255 wait_task_zombie kernel/exit.c:1198 [inline] wait_consider_task+0x306d/0x3ce0 kernel/exit.c:1425 do_wait_thread kernel/exit.c:1488 [inline] do_wait+0x7cd/0xd90 kernel/exit.c:1605 kernel_wait4+0x150/0x260 kernel/exit.c:1768 __do_sys_wait4+0x13f/0x150 kernel/exit.c:1796 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 RIP: 0033:0x7f01b8a89ca7 Code: 89 7c 24 10 48 89 4c 24 18 e8 f5 58 02 00 4c 8b 54 24 18 8b 54 24 14 41 89 c0 48 8b 74 24 08 8b 7c 24 10 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 89 44 24 10 e8 25 59 02 00 8b 44 RSP: 002b:00007ffc4a823180 EFLAGS: 00000293 ORIG_RAX: 000000000000003d RAX: ffffffffffffffda RBX: 0000000000000afe RCX: 00007f01b8a89ca7 RDX: 0000000040000001 RSI: 00007ffc4a82320c RDI: 00000000ffffffff RBP: 00007ffc4a82320c R08: 0000000000000000 R09: 00007ffc4a89f080 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032 R13: 00000000002011ef R14: 0000000000000008 R15: 00007ffc4a823270 Allocated by task 25802: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:325 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:769 [inline] kmem_cache_alloc_bulk+0x3aa/0x730 mm/slub.c:4033 __io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062 io_alloc_req_refill io_uring/io_uring.h:348 [inline] io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407 __do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429 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 25512: 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:162 [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+0xec/0x4e0 mm/slub.c:3809 io_req_caches_free+0x1a9/0x1e6 io_uring/io_uring.c:2737 io_ring_exit_work+0x2e7/0xc80 io_uring/io_uring.c:2967 process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293 worker_thread+0x669/0x1090 kernel/workqueue.c:2440 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 The buggy address belongs to the object at ffff88802daae780 which belongs to the cache io_kiocb of size 216 The buggy address is located 48 bytes inside of 216-byte region [ffff88802daae780, ffff88802daae858) The buggy address belongs to the physical page: page:ffffea0000b6ab80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2daae memcg:ffff88802bec9201 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffff888146436640 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800c000c 00000001ffffffff ffff88802bec9201 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 25802, tgid 25796 (syz-executor.2), ts 2101558666157, free_ts 2018338133758 prep_new_page mm/page_alloc.c:2549 [inline] get_page_from_freelist+0x11bb/0x2d50 mm/page_alloc.c:4324 __alloc_pages+0x1cb/0x5c0 mm/page_alloc.c:5590 alloc_pages+0x1aa/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 __kmem_cache_alloc_bulk mm/slub.c:3951 [inline] kmem_cache_alloc_bulk+0x23d/0x730 mm/slub.c:4026 __io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062 io_alloc_req_refill io_uring/io_uring.h:348 [inline] io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407 __do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429 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 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1451 [inline] free_pcp_prepare+0x4d0/0x910 mm/page_alloc.c:1501 free_unref_page_prepare mm/page_alloc.c:3387 [inline] free_unref_page+0x1d/0x490 mm/page_alloc.c:3482 kasan_depopulate_vmalloc_pte+0x60/0x80 mm/kasan/shadow.c:372 apply_to_pte_range mm/memory.c:2575 [inline] apply_to_pmd_range mm/memory.c:2619 [inline] apply_to_pud_range mm/memory.c:2655 [inline] apply_to_p4d_range mm/memory.c:2691 [inline] __apply_to_page_range+0x68c/0x1030 mm/memory.c:2725 kasan_release_vmalloc+0xab/0xc0 mm/kasan/shadow.c:486 __purge_vmap_area_lazy+0x897/0x1fa0 mm/vmalloc.c:1776 drain_vmap_area_work+0x56/0xe0 mm/vmalloc.c:1809 process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293 worker_thread+0x669/0x1090 kernel/workqueue.c:2440 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Memory state around the buggy address: ffff88802daae680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802daae700: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802daae780: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802daae800: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc ffff88802daae880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================