EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none. ================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0xa10/0x1e90 fs/ext4/xattr.c:1760 Read of size 18446744073709551600 at addr ffff8880502c62b8 by task syz.5.1099/11793 CPU: 1 PID: 11793 Comm: syz.5.1099 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xac/0x220 mm/kasan/report.c:468 kasan_report+0x117/0x150 mm/kasan/report.c:581 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x288/0x290 mm/kasan/generic.c:187 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94 ext4_xattr_set_entry+0xa10/0x1e90 fs/ext4/xattr.c:1760 ext4_xattr_ibody_set+0x254/0x6a0 fs/ext4/xattr.c:2267 ext4_destroy_inline_data_nolock+0x215/0x5c0 fs/ext4/inline.c:467 ext4_convert_inline_data_to_extent fs/ext4/inline.c:618 [inline] ext4_try_to_write_inline_data+0x69c/0x12e0 fs/ext4/inline.c:758 ext4_write_begin+0x254/0x1060 fs/ext4/inode.c:1179 generic_perform_write+0x2fb/0x5b0 mm/filemap.c:4031 ext4_buffered_write_iter+0xcc/0x350 fs/ext4/file.c:299 ext4_file_write_iter+0x1d9/0x1870 fs/ext4/file.c:-1 do_iter_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x79a/0xc70 fs/read_write.c:860 vfs_writev fs/read_write.c:933 [inline] do_pwritev+0x205/0x340 fs/read_write.c:1030 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f91aeb8f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f91afa72038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007f91aede5fa0 RCX: 00007f91aeb8f749 RDX: 0000000000000001 RSI: 0000200000000100 RDI: 0000000000000004 RBP: 00007f91aec13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000005412 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f91aede6038 R14: 00007f91aede5fa0 R15: 00007ffd23ade918 The buggy address belongs to the physical page: page:ffffea000140b180 refcount:3 mapcount:1 mapping:ffff88801fe30878 index:0x2 pfn:0x502c6 memcg:ffff88802ce82000 aops:def_blk_aops ino:700005 flags: 0xfff5800002823c(referenced|uptodate|dirty|lru|workingset|private|mappedtodisk|node=0|zone=1|lastcpupid=0x7ff) page_type: 0x0() raw: 00fff5800002823c ffffea0001fcc088 ffffea000136fbc8 ffff88801fe30878 raw: 0000000000000002 ffff88805a5f89f8 0000000300000000 ffff88802ce82000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP_NOFS|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 11793, tgid 11792 (syz.5.1099), ts 395469622807, free_ts 395427082983 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554 prep_new_page mm/page_alloc.c:1561 [inline] get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191 __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457 folio_alloc+0x1e/0x30 mm/mempolicy.c:2291 filemap_alloc_folio+0xdf/0x470 mm/filemap.c:1004 __filemap_get_folio+0x3ee/0xbc0 mm/filemap.c:1962 grow_dev_page fs/buffer.c:1058 [inline] grow_buffers fs/buffer.c:1118 [inline] __getblk_slow fs/buffer.c:1145 [inline] __getblk_gfp+0x223/0x660 fs/buffer.c:1439 sb_getblk include/linux/buffer_head.h:344 [inline] __ext4_get_inode_loc+0x478/0xdf0 fs/ext4/inode.c:4494 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4607 [inline] __ext4_iget+0x451/0x3f40 fs/ext4/inode.c:4854 ext4_lookup+0x257/0x6d0 fs/ext4/namei.c:1858 lookup_open fs/namei.c:3474 [inline] open_last_lookups fs/namei.c:3564 [inline] path_openat+0x10b8/0x3190 fs/namei.c:3794 do_filp_open+0x1c5/0x3d0 fs/namei.c:3824 do_sys_openat2+0x12c/0x1c0 fs/open.c:1421 do_sys_open fs/open.c:1436 [inline] __do_sys_openat fs/open.c:1452 [inline] __se_sys_openat fs/open.c:1447 [inline] __x64_sys_openat+0x139/0x160 fs/open.c:1447 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1154 [inline] free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336 free_unref_page_list+0xbe/0x860 mm/page_alloc.c:2475 release_pages+0x1fa0/0x2220 mm/swap.c:1022 tlb_batch_pages_flush mm/mmu_gather.c:98 [inline] tlb_flush_mmu_free mm/mmu_gather.c:293 [inline] tlb_flush_mmu+0x368/0x4f0 mm/mmu_gather.c:300 tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:392 exit_mmap+0x3f0/0xb50 mm/mmap.c:3315 __mmput+0x118/0x3c0 kernel/fork.c:1355 exit_mm+0x1da/0x2c0 kernel/exit.c:569 do_exit+0x88e/0x23c0 kernel/exit.c:870 do_group_exit+0x21b/0x2d0 kernel/exit.c:1024 get_signal+0x12fc/0x1400 kernel/signal.c:2902 arch_do_signal_or_restart+0x9c/0x7b0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82 Memory state around the buggy address: ffff8880502c6180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880502c6200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880502c6280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8880502c6300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880502c6380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================