loop2: detected capacity change from 0 to 255 ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x42c9/0x5e80 Read of size 8 at addr ffff88800e0f2738 by task syz-executor/35916 CPU: 1 PID: 35916 Comm: syz-executor Not tainted 6.1.0-rc3-next-20221031 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0x8b/0xc3 print_report+0x175/0x478 kasan_report+0xbb/0x1d0 __lock_acquire+0x42c9/0x5e80 lock_acquire+0x1a2/0x540 _raw_spin_lock_irq+0x32/0x60 kmemleak_scan+0x1a0/0x1610 kmemleak_write+0x570/0x690 full_proxy_write+0x11d/0x1a0 vfs_write+0x2cb/0xda0 ksys_write+0x127/0x260 do_syscall_64+0x3b/0xa0 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7f54542ef5c3 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:00007ffdf8abf4a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ffdf8abfae8 RCX: 00007f54542ef5c3 RDX: 0000000000000004 RSI: 00007f54543a5ed9 RDI: 0000000000000003 RBP: 0000000000000002 R08: 000000000000045e R09: 00007ffdf8b37080 R10: 00007ffdf8b37090 R11: 0000000000000246 R12: 00000000fffffff6 R13: 00007ffdf8abfef1 R14: 0000000000000000 R15: 0000000000110fff Allocated by task 182: kasan_save_stack+0x1e/0x50 kasan_set_track+0x21/0x40 __kasan_slab_alloc+0x58/0x80 kmem_cache_alloc+0x1a9/0x3f0 __create_object+0x3d/0xc10 kmem_cache_alloc+0x235/0x3f0 __alloc_file+0x21/0x250 alloc_empty_file+0x6d/0x180 alloc_file+0x59/0x810 alloc_file_pseudo+0x16a/0x260 sock_alloc_file+0x4f/0x1b0 __sys_socket+0x1a8/0x260 __x64_sys_socket+0x6f/0xc0 do_syscall_64+0x3b/0xa0 entry_SYSCALL_64_after_hwframe+0x72/0xdc Freed by task 35918: kasan_save_stack+0x1e/0x50 kasan_set_track+0x21/0x40 kasan_save_free_info+0x2a/0x60 __kasan_slab_free+0x106/0x1a0 kmem_cache_free+0xf7/0x620 rcu_core+0x7e2/0x2090 __do_softirq+0x1c3/0x8f5 Last potentially related work creation: kasan_save_stack+0x1e/0x50 __kasan_record_aux_stack+0x95/0xc0 __call_rcu_common.constprop.0+0x6a/0xa50 kmem_cache_free+0xbd/0x620 rcu_core+0x7e2/0x2090 __do_softirq+0x1c3/0x8f5 Second to last potentially related work creation: kasan_save_stack+0x1e/0x50 __kasan_record_aux_stack+0x95/0xc0 __call_rcu_common.constprop.0+0x6a/0xa50 kmem_cache_free+0xbd/0x620 security_file_free+0xaa/0xe0 __fput+0x3db/0xa50 task_work_run+0x170/0x290 exit_to_user_mode_prepare+0x199/0x1b0 syscall_exit_to_user_mode+0x19/0x50 do_syscall_64+0x48/0xa0 entry_SYSCALL_64_after_hwframe+0x72/0xdc The buggy address belongs to the object at ffff88800e0f2720 which belongs to the cache kmemleak_object of size 240 The buggy address is located 24 bytes inside of 240-byte region [ffff88800e0f2720, ffff88800e0f2810) The buggy address belongs to the physical page: page:0000000052ac059e refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xe0f2 anon flags: 0x100000000000200(slab|node=0|zone=1) raw: 0100000000000200 ffff888007c4f780 ffffea0000668140 dead000000000005 raw: 0000000000000000 00000000000d000d 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88800e0f2600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88800e0f2680: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc >ffff88800e0f2700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb ^ ffff88800e0f2780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88800e0f2800: fb fb fc fc fc fc fc fc fc fc 00 00 00 00 00 00 ==================================================================