EXT4-fs: Ignoring removed nomblk_io_submit option [EXT4 FS bs=1024, gc=1, bpg=131072, ipg=32, mo=8043c118, mo2=0002] EXT4-fs (loop1): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none. loop1: detected capacity change from 1024 to 64 ================================================================== BUG: KASAN: use-after-free in xattr_find_entry+0x1a5/0x280 fs/ext4/xattr.c:334 Read of size 4 at addr ffff88805ee0d004 by task syz.1.20/6449 CPU: 1 UID: 49663 PID: 6449 Comm: syz.1.20 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xba/0x230 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 xattr_find_entry+0x1a5/0x280 fs/ext4/xattr.c:334 ext4_xattr_ibody_get+0x232/0x4c0 fs/ext4/xattr.c:655 ext4_xattr_get+0x123/0x6a0 fs/ext4/xattr.c:709 ext4_get_acl+0x84/0x930 fs/ext4/acl.c:165 __get_acl+0x27e/0x410 fs/posix_acl.c:159 check_acl+0x3a/0x150 fs/namei.c:385 acl_permission_check fs/namei.c:471 [inline] generic_permission+0x497/0x690 fs/namei.c:524 do_inode_permission fs/namei.c:585 [inline] inode_permission+0x243/0x5f0 fs/namei.c:648 lookup_inode_permission_may_exec fs/namei.c:-1 [inline] may_lookup fs/namei.c:1973 [inline] link_path_walk+0x1149/0x18d0 fs/namei.c:2595 path_lookupat+0xe4/0x8c0 fs/namei.c:2803 filename_lookup+0x256/0x5d0 fs/namei.c:2833 user_path_at+0x40/0x160 fs/namei.c:3612 do_mount fs/namespace.c:4169 [inline] __do_sys_mount fs/namespace.c:4361 [inline] __se_sys_mount+0x2dc/0x420 fs/namespace.c:4338 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc84bf9c629 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc84ce5a028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fc84c215fa0 RCX: 00007fc84bf9c629 RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000000 RBP: 00007fc84c032b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000002094080 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc84c216038 R14: 00007fc84c215fa0 R15: 00007ffce5982ab8 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7ff16583b pfn:0x5ee0d flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffffea000188d188 ffffea00017b8248 0000000000000000 raw: 00000007ff16583b 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|__GFP_COMP), pid 6434, tgid 6434 (modprobe), ts 142554552793, free_ts 142583271307 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889 prep_new_page mm/page_alloc.c:1897 [inline] get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2484 folio_alloc_mpol_noprof mm/mempolicy.c:2503 [inline] vma_alloc_folio_noprof+0xea/0x210 mm/mempolicy.c:2538 folio_prealloc mm/memory.c:-1 [inline] alloc_anon_folio mm/memory.c:5208 [inline] do_anonymous_page mm/memory.c:5265 [inline] do_pte_missing+0x1656/0x3750 mm/memory.c:4475 handle_pte_fault mm/memory.c:6316 [inline] __handle_mm_fault mm/memory.c:6454 [inline] handle_mm_fault+0x1bec/0x3310 mm/memory.c:6623 do_user_addr_fault+0xa73/0x1340 arch/x86/mm/fault.c:1334 handle_page_fault arch/x86/mm/fault.c:1474 [inline] exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 page last free pid 6434 tgid 6434 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1433 [inline] free_unref_folios+0xed5/0x16d0 mm/page_alloc.c:3040 folios_put_refs+0x789/0x8d0 mm/swap.c:1002 free_pages_and_swap_cache+0x2e7/0x5b0 mm/swap_state.c:423 __tlb_batch_free_encoded_pages mm/mmu_gather.c:138 [inline] tlb_batch_pages_flush mm/mmu_gather.c:151 [inline] tlb_flush_mmu_free mm/mmu_gather.c:398 [inline] tlb_flush_mmu+0x6d3/0xa30 mm/mmu_gather.c:405 tlb_finish_mmu+0xf9/0x230 mm/mmu_gather.c:530 exit_mmap+0x498/0xa10 mm/mmap.c:1315 __mmput+0x118/0x430 kernel/fork.c:1174 exit_mm+0x168/0x220 kernel/exit.c:581 do_exit+0x6a2/0x23c0 kernel/exit.c:964 do_group_exit+0x21b/0x2d0 kernel/exit.c:1118 __do_sys_exit_group kernel/exit.c:1129 [inline] __se_sys_exit_group kernel/exit.c:1127 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1127 x64_sys_call+0x221a/0x2240 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88805ee0cf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805ee0cf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88805ee0d000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88805ee0d080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88805ee0d100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================