syz-executor.7: attempt to access beyond end of device loop7: rw=2049, sector=40, nr_sectors = 4 limit=40 Buffer I/O error on dev loop7, logical block 10, lost async page write ================================================================== BUG: KASAN: use-after-free in perf_trace_lock_acquire+0x402/0x530 Read of size 8 at addr ffff88801958a3c0 by task syz-executor/8868 CPU: 1 PID: 8868 Comm: syz-executor Not tainted 6.1.0-rc4-next-20221109 #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 perf_trace_lock_acquire+0x402/0x530 lock_acquire+0x417/0x530 _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: 0033:0x7fd9f310a5c3 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:00007ffd5d866a88 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ffd5d8670c8 RCX: 00007fd9f310a5c3 RDX: 0000000000000004 RSI: 00007fd9f31c0ed9 RDI: 0000000000000003 RBP: 0000000000000002 R08: 000000000000079c R09: 00007ffd5d9c3080 R10: 00007ffd5d9c3090 R11: 0000000000000246 R12: 00000000fffffff6 R13: 00007ffd5d868ef1 R14: 0000000000000000 R15: 00000000001dba58 Allocated by task 8872: 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_lru+0x2dc/0x740 __d_alloc+0x31/0x9c0 d_alloc+0x4a/0x1d0 __lookup_hash+0xcc/0x190 do_unlinkat+0x28c/0x620 __x64_sys_unlink+0xca/0x110 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc Freed by task 13: 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 Second to 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 kfree_skbmem+0xef/0x1b0 kfree_skb_reason+0x147/0x3e0 ieee80211_iface_work+0x353/0xc90 process_one_work+0xa17/0x16a0 worker_thread+0x63b/0x1260 kthread+0x2f1/0x3a0 ret_from_fork+0x2c/0x50 The buggy address belongs to the object at ffff88801958a390 which belongs to the cache kmemleak_object of size 240 The buggy address is located 48 bytes inside of 240-byte region [ffff88801958a390, ffff88801958a480) The buggy address belongs to the physical page: page:000000005fea7b25 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1958a flags: 0x100000000000200(slab|node=0|zone=1) raw: 0100000000000200 ffff88800804f780 dead000000000100 dead000000000122 raw: 0000000000000000 00000000000d000d 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88801958a280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801958a300: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc >ffff88801958a380: fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801958a400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801958a480: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ==================================================================