EXT4-fs (loop0): Remounting filesystem read-only ================================================================== BUG: KASAN: out-of-bounds in ext4_ext_rm_leaf fs/ext4/extents.c:2715 [inline] BUG: KASAN: out-of-bounds in ext4_ext_remove_space+0x2149/0x4a60 fs/ext4/extents.c:2937 Read of size 18446744073709551604 at addr ffff888128579018 by task syz.0.21/501 CPU: 1 PID: 501 Comm: syz.0.21 Not tainted 5.15.178-syzkaller-1079147-g7d1f9b5c2ff5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106 print_address_description+0x87/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:444 kasan_check_range+0x293/0x2a0 mm/kasan/generic.c:189 memmove+0x2d/0x70 mm/kasan/shadow.c:54 ext4_ext_rm_leaf fs/ext4/extents.c:2715 [inline] ext4_ext_remove_space+0x2149/0x4a60 fs/ext4/extents.c:2937 ext4_punch_hole+0x794/0xbf0 fs/ext4/inode.c:4130 ext4_fallocate+0x30c/0x1f30 fs/ext4/extents.c:4763 vfs_fallocate+0x492/0x570 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+0x783/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:286 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7efcd7c3aff9 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:00007efcd769b038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007efcd7df3058 RCX: 00007efcd7c3aff9 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004 RBP: 00007efcd7cad296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001a00 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007efcd7df3058 R15: 00007fff4f7651c8 The buggy address belongs to the page: page:ffffea0004a15e40 refcount:2 mapcount:0 mapping:ffff88810928b458 index:0x27 pfn:0x128579 memcg:ffff88810db14000 aops:def_blk_aops ino:700000 flags: 0x4000000000002036(referenced|uptodate|lru|active|private|zone=1) raw: 4000000000002036 ffffea0004905048 ffff88810cd70030 ffff88810928b458 raw: 0000000000000027 ffff88812b97e690 00000002ffffffff ffff88810db14000 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 498, ts 54735468431, free_ts 54639653605 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1b/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5780 __alloc_pages_node include/linux/gfp.h:591 [inline] alloc_pages_node include/linux/gfp.h:605 [inline] alloc_pages include/linux/gfp.h:618 [inline] __page_cache_alloc include/linux/pagemap.h:305 [inline] pagecache_get_page+0xb18/0xeb0 mm/filemap.c:1946 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+0x21e/0x7c0 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+0xf72/0x49d0 fs/ext4/extents.c:2102 ext4_split_extent_at+0x82e/0x11e0 fs/ext4/extents.c:3234 ext4_split_extent+0x1bd/0x4e0 fs/ext4/extents.c:3353 ext4_split_convert_extents fs/ext4/extents.c:3714 [inline] ext4_ext_handle_unwritten_extents fs/ext4/extents.c:3875 [inline] ext4_ext_map_blocks+0x223e/0x7450 fs/ext4/extents.c:4230 ext4_map_blocks+0xa60/0x1c70 fs/ext4/inode.c:673 _ext4_get_block+0x23b/0x660 fs/ext4/inode.c:816 ext4_get_block_unwritten+0x2a/0x40 fs/ext4/inode.c:847 ext4_block_write_begin+0x5ea/0x12a0 fs/ext4/inode.c:1101 ext4_write_begin+0x6bc/0x13d0 ext4_da_write_begin+0x4a2/0xc30 fs/ext4/inode.c:2987 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+0x7c8/0x7d0 mm/page_alloc.c:3534 free_unref_page_list+0x14b/0xa60 mm/page_alloc.c:3671 release_pages+0x1310/0x1370 mm/swap.c:1009 free_pages_and_swap_cache+0x8a/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+0x177/0x320 mm/mmu_gather.c:338 unmap_region+0x304/0x350 mm/mmap.c:2680 __do_munmap+0x13e4/0x19d0 mm/mmap.c:2913 __vm_munmap+0x166/0x2a0 mm/mmap.c:2966 __do_sys_munmap mm/mmap.c:2992 [inline] __se_sys_munmap mm/mmap.c:2988 [inline] __x64_sys_munmap+0x6b/0x80 mm/mmap.c:2988 x64_sys_call+0x75/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:12 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Memory state around the buggy address: ffff888128578f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888128578f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888128579000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888128579080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888128579100: 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:4351: comm syz.0.21: 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:5837: Corrupt filesystem EXT4-fs (loop0): Remounting filesystem read-only EXT4-fs error (device loop0): __ext4_ext_dirty:183: inode #16: comm syz.0.21: mark_inode_dirty error EXT4-fs (loop0): Remounting filesystem read-only EXT4-fs error (device loop0): __ext4_get_inode_loc:4351: comm syz.0.21: 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:5837: Corrupt filesystem EXT4-fs (loop0): Remounting filesystem read-only EXT4-fs error (device loop0): ext4_punch_hole:4143: inode #16: comm syz.0.21: mark_inode_dirty error EXT4-fs (loop0): Remounting filesystem read-only