================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x4346/0x6120 Read of size 8 at addr ffff88800dd0f968 by task syz-executor/22444 CPU: 1 PID: 22444 Comm: syz-executor Not tainted 5.19.0-rc3-next-20220624 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Call Trace: dump_stack_lvl+0x8b/0xb3 print_report.cold+0x5e/0x5e8 kasan_report+0xbe/0x1c0 __lock_acquire+0x4346/0x6120 lock_acquire+0x1a2/0x530 _raw_spin_lock_irq+0x32/0x50 kmemleak_scan+0x21d/0x16b0 kmemleak_write+0x56c/0x680 full_proxy_write+0x11d/0x190 vfs_write+0x264/0xac0 ksys_write+0x127/0x250 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f37457135c3 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:00007fffa7112258 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fffa7112898 RCX: 00007f37457135c3 RDX: 0000000000000004 RSI: 00007f37457c9ed9 RDI: 0000000000000003 RBP: 0000000000000004 R08: 0000000000000639 R09: 00007fffa717a080 R10: 00007fffa717a090 R11: 0000000000000246 R12: 00007f3745715b10 R13: 00007fffa7112ed7 R14: 0000000000000000 R15: 00000000001851ae Allocated by task 127: kasan_save_stack+0x1e/0x40 __kasan_slab_alloc+0x66/0x80 kmem_cache_alloc+0x1b1/0x490 __create_object.isra.0+0x3d/0xc10 kmem_cache_alloc+0x247/0x490 __alloc_file+0x21/0x230 alloc_empty_file+0x6d/0x170 path_openat+0xe1/0x2870 do_filp_open+0x1aa/0x400 do_sys_openat2+0x16d/0x4c0 __x64_sys_openat+0x13f/0x1f0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Freed by task 19: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 kasan_set_free_info+0x20/0x30 ____kasan_slab_free+0x14b/0x1a0 kmem_cache_free+0xe7/0x5e0 rcu_core+0x7e2/0x2070 __do_softirq+0x270/0x8c7 Last potentially related work creation: kasan_save_stack+0x1e/0x40 __kasan_record_aux_stack+0x97/0xa0 call_rcu+0x6a/0xa20 kmem_cache_free+0x26e/0x5e0 rcu_core+0x7e2/0x2070 __do_softirq+0x270/0x8c7 Second to last potentially related work creation: kasan_save_stack+0x1e/0x40 __kasan_record_aux_stack+0x97/0xa0 call_rcu+0x6a/0xa20 kfree+0x1e1/0x5b0 shmem_evict_inode+0x149/0xa70 evict+0x284/0x610 iput.part.0+0x52d/0x7d0 iput+0x58/0x70 dentry_unlink_inode+0x2b4/0x460 __dentry_kill+0x36f/0x5c0 dput+0x664/0xe10 do_renameat2+0x567/0xc30 __x64_sys_rename+0x7d/0xa0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x46/0xb0 The buggy address belongs to the object at ffff88800dd0f950 which belongs to the cache kmemleak_object of size 368 The buggy address is located 24 bytes inside of 368-byte region [ffff88800dd0f950, ffff88800dd0fac0) The buggy address belongs to the physical page: page:000000005d2ea3ec refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xdd0e head:000000005d2ea3ec order:1 compound_mapcount:0 compound_pincount:0 flags: 0x100000000010200(slab|head|node=0|zone=1) raw: 0100000000010200 ffffea00005d3100 dead000000000004 ffff88800784f780 raw: 0000000000000000 0000000000120012 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88800dd0f800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88800dd0f880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88800dd0f900: fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb ^ ffff88800dd0f980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88800dd0fa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================