R10: 00000000200002c0 R11: 0000000000000202 R12: 0000000020000100 R13: 0000000020ffc000 R14: 00000000200002c0 R15: 0000000020ffb000 ================================================================== BUG: KASAN: slab-use-after-free in __lock_acquire+0x340f/0x4430 Read of size 8 at addr ffff888019190978 by task syz-executor.2/6717 CPU: 0 UID: 0 PID: 6717 Comm: syz-executor.2 Not tainted 6.12.0-next-20241119 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0xca/0x120 print_report+0xcb/0x620 kasan_report+0xbd/0xf0 __lock_acquire+0x340f/0x4430 lock_acquire.part.0+0xeb/0x320 _raw_spin_lock_irqsave+0x3a/0x60 try_to_wake_up+0x9f/0x1880 io_sq_thread_park+0xac/0xe0 io_sq_thread_finish+0x64/0x290 io_sq_offload_create+0x162/0x1120 io_uring_setup+0x171a/0x31d0 __x64_sys_io_uring_setup+0x99/0x160 do_syscall_64+0xbf/0x1d0 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1494a17b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1491f8d108 EFLAGS: 00000202 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 00007f1494b2af60 RCX: 00007f1494a17b19 RDX: 0000000020ffc000 RSI: 0000000020000200 RDI: 0000000000002ad1 RBP: 0000000020000200 R08: 0000000020000100 R09: 0000000020000100 R10: 00000000200002c0 R11: 0000000000000202 R12: 0000000020000100 R13: 0000000020ffc000 R14: 00000000200002c0 R15: 0000000020ffb000 Allocated by task 6717: kasan_save_stack+0x24/0x50 kasan_save_track+0x14/0x30 __kasan_slab_alloc+0x59/0x70 kmem_cache_alloc_node_noprof+0x14c/0x3e0 copy_process+0x45c/0x8e90 create_io_thread+0xac/0xf0 io_sq_offload_create+0xaf2/0x1120 io_uring_setup+0x171a/0x31d0 __x64_sys_io_uring_setup+0x99/0x160 do_syscall_64+0xbf/0x1d0 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 23: kasan_save_stack+0x24/0x50 kasan_save_track+0x14/0x30 kasan_save_free_info+0x3a/0x60 __kasan_slab_free+0x38/0x50 kmem_cache_free+0x138/0x470 delayed_put_task_struct+0x108/0x2a0 rcu_core+0x7c9/0x1790 handle_softirqs+0x1b1/0x770 run_ksoftirqd+0x2e/0x60 smpboot_thread_fn+0x3eb/0x930 kthread+0x2c2/0x3a0 ret_from_fork+0x48/0x80 ret_from_fork_asm+0x1a/0x30 Last potentially related work creation: kasan_save_stack+0x24/0x50 __kasan_record_aux_stack+0x8c/0xa0 __call_rcu_common.constprop.0+0x6a/0xaa0 put_task_struct_rcu_user+0x75/0xc0 __schedule+0xc21/0x2fa0 __cond_resched+0x45/0x70 process_one_work+0xab2/0x1a00 worker_thread+0x674/0xe70 kthread+0x2c2/0x3a0 ret_from_fork+0x48/0x80 ret_from_fork_asm+0x1a/0x30 The buggy address belongs to the object at ffff888019190000 which belongs to the cache task_struct of size 6784 The buggy address is located 2424 bytes inside of freed 6784-byte region [ffff888019190000, ffff888019191a80) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x19190 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88800bf5d181 flags: 0x100000000000040(head|node=0|zone=1) page_type: f5(slab) raw: 0100000000000040 ffff888008ff0640 ffffea000057f800 dead000000000002 raw: 0000000000000000 0000000080040004 00000001f5000000 ffff88800bf5d181 head: 0100000000000040 ffff888008ff0640 ffffea000057f800 dead000000000002 head: 0000000000000000 0000000080040004 00000001f5000000 ffff88800bf5d181 head: 0100000000000003 ffffea0000646401 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888019190800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888019190880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888019190900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888019190980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888019190a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================