================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x42c9/0x5e70 Read of size 8 at addr ffff88804230dd28 by task syz-executor/8656 CPU: 1 PID: 8656 Comm: syz-executor Not tainted 6.1.0-rc4-next-20221110 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0x8f/0xb7 print_report+0x175/0x478 kasan_report+0xbf/0x1c0 __lock_acquire+0x42c9/0x5e70 lock_acquire+0x1a6/0x530 _raw_spin_lock_irq+0x36/0x50 kmemleak_scan+0x1a0/0x1600 kmemleak_write+0x574/0x680 full_proxy_write+0x121/0x190 vfs_write+0x2cf/0xd90 ksys_write+0x12b/0x260 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7f69ce0a05c3 Code: 16 00 00 00 eb ae 90 b8 6e 00 00 00 eb a6 e8 44 ef 04 00 0f 1f 40 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 55 c3 0f 1f 40 00 48 83 ec 28 48 89 54 24 18 RSP: 002b:00007fff9912e418 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fff9912ea58 RCX: 00007f69ce0a05c3 RDX: 0000000000000004 RSI: 00007f69ce156ed9 RDI: 0000000000000003 RBP: 0000000000000002 R08: 0000000000000559 R09: 00007fff9916d080 R10: 00007fff9916d090 R11: 0000000000000246 R12: 00000000fffffff6 R13: 00007fff9912eef1 R14: 0000000000000000 R15: 000000000014e748 Allocated by task 127: kasan_save_stack+0x22/0x50 kasan_set_track+0x25/0x30 __kasan_slab_alloc+0x5c/0x70 kmem_cache_alloc+0x1b1/0x3e0 __create_object+0x3d/0xc00 kmem_cache_alloc+0x23d/0x3e0 __alloc_file+0x21/0x240 alloc_empty_file+0x71/0x170 path_openat+0xd4/0x29b0 do_filp_open+0x1ba/0x410 do_sys_openat2+0x171/0x4c0 __x64_sys_openat+0x143/0x200 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc Freed by task 19: kasan_save_stack+0x22/0x50 kasan_set_track+0x25/0x30 kasan_save_free_info+0x2e/0x50 __kasan_slab_free+0x10a/0x190 kmem_cache_free+0xfb/0x610 rcu_core+0x7e2/0x2090 __do_softirq+0x1c7/0x8f9 Last potentially related work creation: kasan_save_stack+0x22/0x50 __kasan_record_aux_stack+0x95/0xb0 __call_rcu_common.constprop.0+0x6a/0xa40 kmem_cache_free+0xc1/0x610 rcu_core+0x7e2/0x2090 __do_softirq+0x1c7/0x8f9 The buggy address belongs to the object at ffff88804230dd10 which belongs to the cache kmemleak_object of size 240 The buggy address is located 24 bytes inside of 240-byte region [ffff88804230dd10, ffff88804230de00) The buggy address belongs to the physical page: page:0000000016d246c6 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4230d flags: 0x100000000000200(slab|node=0|zone=1) raw: 0100000000000200 ffff88800804f780 dead000000000122 0000000000000000 raw: 0000000000000000 00000000000d000d 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88804230dc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804230dc80: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc >ffff88804230dd00: fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804230dd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804230de00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ==================================================================