EXT4-fs error (device loop0): ext4_free_blocks:6218: comm syz.0.42: Freeing blocks not in datazone - block = 41, count = 1 EXT4-fs (loop0): Remounting filesystem read-only ================================================================== BUG: KASAN: out-of-bounds in ext4_ext_rm_leaf fs/ext4/extents.c:2717 [inline] BUG: KASAN: out-of-bounds in ext4_ext_remove_space+0x1eef/0x4180 fs/ext4/extents.c:2939 Read of size 18446744073709551604 at addr ffff888129154018 by task syz.0.42/618 CPU: 1 PID: 618 Comm: syz.0.42 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0xee/0x150 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+0x280/0x290 mm/kasan/generic.c:189 memmove+0x2d/0x70 mm/kasan/shadow.c:54 ext4_ext_rm_leaf fs/ext4/extents.c:2717 [inline] ext4_ext_remove_space+0x1eef/0x4180 fs/ext4/extents.c:2939 ext4_punch_hole+0x77c/0xbd0 fs/ext4/inode.c:4137 ext4_fallocate+0x2b6/0x1de0 fs/ext4/extents.c:4765 vfs_fallocate+0x4b4/0x590 fs/open.c:309 ksys_fallocate fs/open.c:332 [inline] __do_sys_fallocate fs/open.c:340 [inline] __se_sys_fallocate fs/open.c:338 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:338 x64_sys_call+0x7ec/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:286 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: 0033:0x7efc5c17dff9 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:00007efc5bbde038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007efc5c336058 RCX: 00007efc5c17dff9 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004 RBP: 00007efc5c1f0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001a00 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007efc5c336058 R15: 00007ffdee9ae318 The buggy address belongs to the page: page:ffffea0004a45500 refcount:2 mapcount:0 mapping:ffff8881092c7258 index:0x27 pfn:0x129154 memcg:ffff8881002533c0 aops:def_blk_aops ino:700000 flags: 0x4000000000002036(referenced|uptodate|lru|active|private|zone=1) raw: 4000000000002036 ffffea0004965d08 ffffea0004a44808 ffff8881092c7258 raw: 0000000000000027 ffff88810ce595e8 00000002ffffffff ffff8881002533c0 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 615, ts 53813672154, free_ts 53766279341 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+0x2cc5/0x2d50 mm/page_alloc.c:4485 __alloc_pages+0x18f/0x440 mm/page_alloc.c:5808 __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+0xa82/0xda0 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_gfp include/linux/buffer_head.h:368 [inline] ext4_ext_grow_indepth fs/ext4/extents.c:1330 [inline] ext4_ext_create_new_leaf fs/ext4/extents.c:1431 [inline] ext4_ext_insert_extent+0x110f/0x47a0 fs/ext4/extents.c:2103 ext4_split_extent_at+0x782/0xe80 fs/ext4/extents.c:3235 ext4_split_extent+0x1d7/0x4e0 fs/ext4/extents.c:3354 ext4_split_convert_extents fs/ext4/extents.c:3715 [inline] ext4_ext_handle_unwritten_extents fs/ext4/extents.c:3876 [inline] ext4_ext_map_blocks+0x112c/0x6270 fs/ext4/extents.c:4231 ext4_map_blocks+0x97b/0x1b20 fs/ext4/inode.c:674 _ext4_get_block+0x1da/0x4e0 fs/ext4/inode.c:817 ext4_get_block_unwritten+0x2a/0x40 fs/ext4/inode.c:848 ext4_block_write_begin+0x556/0x1150 fs/ext4/inode.c:1102 ext4_write_begin+0x638/0x1220 fs/ext4/ext4_jbd2.h:-1 ext4_da_write_begin+0x2fa/0xb60 fs/ext4/inode.c:2988 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+0x134/0x9d0 mm/page_alloc.c:3671 release_pages+0xfda/0x1030 mm/swap.c:1014 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+0x175/0x300 mm/mmu_gather.c:338 unmap_region+0x315/0x360 mm/mmap.c:2692 __do_munmap+0xa0e/0xfe0 mm/mmap.c:2925 __vm_munmap+0x15b/0x2a0 mm/mmap.c:2978 __do_sys_munmap mm/mmap.c:3004 [inline] __se_sys_munmap mm/mmap.c:3000 [inline] __x64_sys_munmap+0x6b/0x80 mm/mmap.c:3000 x64_sys_call+0xc9/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:12 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: ffff888129153f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888129153f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888129154000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888129154080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888129154100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs error (device loop0): __ext4_get_inode_loc:4358: comm syz.0.42: Invalid inode table block 0 in block_group 0 EXT4-fs (loop0): Remounting filesystem read-only EXT4-fs error (device loop0) in ext4_reserve_inode_write:5873: Corrupt filesystem EXT4-fs (loop0): Remounting filesystem read-only EXT4-fs error (device loop0): __ext4_ext_dirty:183: inode #16: comm syz.0.42: mark_inode_dirty error EXT4-fs (loop0): Remounting filesystem read-only EXT4-fs error (device loop0): __ext4_get_inode_loc:4358: comm syz.0.42: Invalid inode table block 0 in block_group 0 EXT4-fs (loop0): Remounting filesystem read-only EXT4-fs error (device loop0) in ext4_reserve_inode_write:5873: Corrupt filesystem EXT4-fs (loop0): Remounting filesystem read-only EXT4-fs error (device loop0): ext4_punch_hole:4150: inode #16: comm syz.0.42: mark_inode_dirty error EXT4-fs (loop0): Remounting filesystem read-only