================================================================== BUG: KASAN: use-after-free in ext4_xattr_delete_inode+0xba6/0xbb0 fs/ext4/xattr.c:2920 Read of size 4 at addr ffff888073ffc000 by task syz-executor/4781 CPU: 1 PID: 4781 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 ext4_xattr_delete_inode+0xba6/0xbb0 fs/ext4/xattr.c:2920 ext4_evict_inode+0xc47/0x1080 fs/ext4/inode.c:299 evict+0x485/0x870 fs/inode.c:647 d_delete_notify include/linux/fsnotify.h:267 [inline] vfs_rmdir+0x3b4/0x430 fs/namei.c:4162 do_rmdir+0x295/0x710 fs/namei.c:4210 __do_sys_unlinkat fs/namei.c:4390 [inline] __se_sys_unlinkat fs/namei.c:4384 [inline] __x64_sys_unlinkat+0xc0/0xe0 fs/namei.c:4384 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f72c70146c7 Code: 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffeb4cc71c8 EFLAGS: 00000207 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f72c70146c7 RDX: 0000000000000200 RSI: 00007ffeb4cc8370 RDI: 00000000ffffff9c RBP: 00007f72c7060336 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000207 R12: 00007ffeb4cc8370 R13: 00007f72c7060336 R14: 0000000000016ad1 R15: 0000000000000007 Allocated by task 5029: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x9c/0xd0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc+0x100/0x290 mm/slub.c:3238 anon_vma_chain_alloc mm/rmap.c:138 [inline] anon_vma_fork+0x1f6/0x500 mm/rmap.c:360 dup_mmap kernel/fork.c:574 [inline] dup_mm kernel/fork.c:1466 [inline] copy_mm+0x9e3/0x1380 kernel/fork.c:1518 copy_process+0x17c6/0x3e00 kernel/fork.c:2290 kernel_clone+0x219/0x930 kernel/fork.c:2679 __do_sys_clone kernel/fork.c:2796 [inline] __se_sys_clone kernel/fork.c:2780 [inline] __x64_sys_clone+0x170/0x1c0 kernel/fork.c:2780 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 5041: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1710 [inline] slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736 slab_free mm/slub.c:3504 [inline] kmem_cache_free+0x8f/0x210 mm/slub.c:3520 anon_vma_chain_free mm/rmap.c:143 [inline] unlink_anon_vmas+0x611/0x660 mm/rmap.c:443 free_pgtables+0x177/0x2a0 mm/memory.c:426 exit_mmap+0x39e/0x5f0 mm/mmap.c:3217 __mmput+0x115/0x3b0 kernel/fork.c:1127 exec_mmap+0x4d1/0x5c0 fs/exec.c:1035 begin_new_exec+0x7e8/0x1160 fs/exec.c:1293 load_elf_binary+0x98e/0x2890 fs/binfmt_elf.c:1001 search_binary_handler fs/exec.c:1742 [inline] exec_binprm fs/exec.c:1783 [inline] bprm_execve+0xa92/0x17d0 fs/exec.c:1852 do_execveat_common+0x51e/0x6d0 fs/exec.c:1957 do_execve fs/exec.c:2027 [inline] __do_sys_execve fs/exec.c:2103 [inline] __se_sys_execve fs/exec.c:2098 [inline] __x64_sys_execve+0x8e/0xa0 fs/exec.c:2098 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff888073ffc000 which belongs to the cache anon_vma_chain of size 80 The buggy address is located 0 bytes inside of 80-byte region [ffff888073ffc000, ffff888073ffc050) The buggy address belongs to the page: page:ffffea0001cfff00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x73ffc memcg:ffff88807d81d401 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000122 ffff888140007140 raw: 0000000000000000 0000000000240024 00000001ffffffff ffff88807d81d401 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 5029, ts 90856574165, free_ts 86151046398 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487 alloc_slab_page mm/slub.c:1780 [inline] allocate_slab mm/slub.c:1917 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1980 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3013 __slab_alloc mm/slub.c:3100 [inline] slab_alloc_node mm/slub.c:3191 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc+0x195/0x290 mm/slub.c:3238 anon_vma_chain_alloc mm/rmap.c:138 [inline] anon_vma_fork+0x1f6/0x500 mm/rmap.c:360 dup_mmap kernel/fork.c:574 [inline] dup_mm kernel/fork.c:1466 [inline] copy_mm+0x9e3/0x1380 kernel/fork.c:1518 copy_process+0x17c6/0x3e00 kernel/fork.c:2290 kernel_clone+0x219/0x930 kernel/fork.c:2679 __do_sys_clone kernel/fork.c:2796 [inline] __se_sys_clone kernel/fork.c:2780 [inline] __x64_sys_clone+0x170/0x1c0 kernel/fork.c:2780 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x94/0x280 mm/page_alloc.c:3396 qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] slab_alloc mm/slub.c:3233 [inline] __kmalloc+0x127/0x330 mm/slub.c:4408 kmalloc include/linux/slab.h:609 [inline] tomoyo_realpath_from_path+0x118/0x610 security/tomoyo/realpath.c:254 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x1cd/0x510 security/tomoyo/file.c:822 security_inode_getattr+0xcf/0x120 security/security.c:1348 vfs_getattr+0x26/0x3a0 fs/stat.c:157 vfs_fstat fs/stat.c:182 [inline] __do_sys_newfstat fs/stat.c:421 [inline] __se_sys_newfstat fs/stat.c:418 [inline] __x64_sys_newfstat+0x104/0x1d0 fs/stat.c:418 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Memory state around the buggy address: ffff888073ffbf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888073ffbf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888073ffc000: fa fb fb fb fb fb fb fb fb fb fc fc fc fc fa fb ^ ffff888073ffc080: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb ffff888073ffc100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb ==================================================================