================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x13ba/0x3940 fs/ext4/xattr.c:1736 Read of size 18446744073709551600 at addr ffff8881204012b8 by task syz.0.184/951 CPU: 1 PID: 951 Comm: syz.0.184 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0xf1/0x140 mm/kasan/report.c:444 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189 memmove+0x2d/0x70 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0x13ba/0x3940 fs/ext4/xattr.c:1736 ext4_xattr_ibody_set+0x122/0x360 fs/ext4/xattr.c:2238 ext4_destroy_inline_data_nolock+0x234/0x5d0 fs/ext4/inline.c:468 ext4_convert_inline_data_to_extent fs/ext4/inline.c:633 [inline] ext4_try_to_write_inline_data+0x6ef/0x1190 fs/ext4/inline.c:774 ext4_write_begin+0x243/0x12e0 fs/ext4/inode.c:1194 ext4_da_write_begin+0x321/0xbf0 fs/ext4/inode.c:2990 generic_perform_write+0x2b7/0x690 mm/filemap.c:3870 ext4_buffered_write_iter+0x4ed/0x670 fs/ext4/file.c:270 ext4_file_write_iter+0x440/0x1540 fs/ext4/file.c:-1 do_iter_readv_writev+0x478/0x5f0 fs/read_write.c:-1 do_iter_write+0x1fa/0x7b0 fs/read_write.c:855 vfs_writev+0x2df/0x570 fs/read_write.c:928 do_pwritev fs/read_write.c:1025 [inline] __do_sys_pwritev2 fs/read_write.c:1084 [inline] __se_sys_pwritev2+0x1af/0x2b0 fs/read_write.c:1075 __x64_sys_pwritev2+0xbf/0xd0 fs/read_write.c:1075 x64_sys_call+0x346/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:329 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: 0033:0x7f2e015abe59 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:00007f2dfffc4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007f2e01825180 RCX: 00007f2e015abe59 RDX: 0000000000000001 RSI: 0000200000000580 RDI: 0000000000000004 RBP: 00007f2e01641d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000005405 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2e01825218 R14: 00007f2e01825180 R15: 00007ffe51f28df8 The buggy address belongs to the page: page:ffffea0004810040 refcount:2 mapcount:0 mapping:ffff888109303c18 index:0x2 pfn:0x120401 memcg:ffff88810ed81140 aops:def_blk_aops ino:700000 flags: 0x400000000006203e(referenced|uptodate|dirty|lru|active|private|mappedtodisk|reclaim|zone=1) raw: 400000000006203e ffffea000479fc88 ffffea000495a4c8 ffff888109303c18 raw: 0000000000000002 ffff88812925c690 00000002ffffffff ffff88810ed81140 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x108c48(GFP_NOFS|__GFP_NOFAIL|__GFP_HARDWALL|__GFP_MOVABLE), pid 938, ts 70036814669, free_ts 69970682522 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x2d3a/0x2dc0 mm/page_alloc.c:4485 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5822 __alloc_pages_node include/linux/gfp.h:595 [inline] alloc_pages_node include/linux/gfp.h:609 [inline] alloc_pages include/linux/gfp.h:622 [inline] __page_cache_alloc include/linux/pagemap.h:305 [inline] pagecache_get_page+0xac6/0xde0 mm/filemap.c:1955 find_or_create_page include/linux/pagemap.h:418 [inline] grow_dev_page fs/buffer.c:949 [inline] grow_buffers fs/buffer.c:1014 [inline] __getblk_slow fs/buffer.c:1041 [inline] __getblk_gfp+0x238/0x7d0 fs/buffer.c:1336 sb_getblk include/linux/buffer_head.h:361 [inline] __ext4_get_inode_loc+0x46e/0xcd0 fs/ext4/inode.c:4370 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4478 [inline] __ext4_iget+0x448/0x3e50 fs/ext4/inode.c:4733 ext4_orphan_get+0x1e4/0x630 fs/ext4/ialloc.c:1406 ext4_orphan_cleanup+0x8a7/0x10f0 fs/ext4/orphan.c:465 ext4_fill_super+0x84b2/0x8bd0 fs/ext4/super.c:4997 mount_bdev+0x2ae/0x3e0 fs/super.c:1400 ext4_mount+0x34/0x40 fs/ext4/super.c:6650 legacy_get_tree+0xed/0x190 fs/fs_context.c:611 vfs_get_tree+0x89/0x260 fs/super.c:1530 do_new_mount+0x25a/0xa20 fs/namespace.c:3034 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] free_pcp_prepare mm/page_alloc.c:1544 [inline] free_unref_page_prepare+0x542/0x550 mm/page_alloc.c:3534 free_unref_page_list+0x13a/0x9d0 mm/page_alloc.c:3671 release_pages+0x1006/0x1060 mm/swap.c:1015 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:320 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:240 [inline] tlb_flush_mmu mm/mmu_gather.c:247 [inline] tlb_finish_mmu+0x17e/0x310 mm/mmu_gather.c:338 exit_mmap+0x43b/0x8b0 mm/mmap.c:3248 __mmput+0x93/0x320 kernel/fork.c:1180 mmput+0x50/0x150 kernel/fork.c:1203 exit_mm kernel/exit.c:555 [inline] do_exit+0xa89/0x2890 kernel/exit.c:877 do_group_exit+0x141/0x310 kernel/exit.c:1004 get_signal+0x66a/0x1480 kernel/signal.c:2907 arch_do_signal_or_restart+0xdf/0x11c0 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0xa7/0xe0 kernel/entry/common.c:178 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 Memory state around the buggy address: ffff888120401180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888120401200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888120401280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888120401300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888120401380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs error (device loop0): ext4_ind_map_blocks:604: inode #15: comm syz.0.184: Can't allocate blocks for non-extent mapped inodes with bigalloc