EXT4-fs error (device loop0): ext4_free_blocks:6225: comm syz.0.27: 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:2711 [inline]
BUG: KASAN: out-of-bounds in ext4_ext_remove_space+0x2149/0x4a60 fs/ext4/extents.c:2933
Read of size 18446744073709551604 at addr ffff8881243bc018 by task syz.0.27/519

CPU: 0 PID: 519 Comm: syz.0.27 Not tainted 5.15.167-syzkaller-1075712-g5e4635681cf1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __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:2711 [inline]
 ext4_ext_remove_space+0x2149/0x4a60 fs/ext4/extents.c:2933
 ext4_punch_hole+0x794/0xbf0 fs/ext4/inode.c:4130
 ext4_fallocate+0x30c/0x1f10 fs/ext4/extents.c:4742
 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: 0033:0x7fa1c752fff9
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:00007fa1c6f90038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007fa1c76e8058 RCX: 00007fa1c752fff9
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004
RBP: 00007fa1c75a2296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000001a00 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fa1c76e8058 R15: 00007ffc9b1adee8
 </TASK>

The buggy address belongs to the page:
page:ffffea000490ef00 refcount:2 mapcount:0 mapping:ffff88810928cb98 index:0x27 pfn:0x1243bc
memcg:ffff88811c9b8000
aops:def_blk_aops ino:700000
flags: 0x4000000000002036(referenced|uptodate|lru|active|private|zone=1)
raw: 4000000000002036 ffffea000490f008 ffff88811c96e030 ffff88810928cb98
raw: 0000000000000027 ffff88810e39b000 00000002ffffffff ffff88811c9b8000
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 515, ts 55225715014, free_ts 55163186615
 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:5779
 __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:1328 [inline]
 ext4_ext_create_new_leaf fs/ext4/extents.c:1429 [inline]
 ext4_ext_insert_extent+0xf7a/0x4b10 fs/ext4/extents.c:2099
 ext4_split_extent_at+0x80e/0x10f0 fs/ext4/extents.c:3230
 ext4_split_extent+0x1bd/0x4e0 fs/ext4/extents.c:3331
 ext4_split_convert_extents fs/ext4/extents.c:3692 [inline]
 ext4_ext_handle_unwritten_extents fs/ext4/extents.c:3854 [inline]
 ext4_ext_map_blocks+0x223e/0x7450 fs/ext4/extents.c:4209
 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:2691
 __do_munmap+0x1421/0x1a90 mm/mmap.c:2925
 __vm_munmap+0x166/0x2a0 mm/mmap.c:2948
 __do_sys_munmap mm/mmap.c:2974 [inline]
 __se_sys_munmap mm/mmap.c:2970 [inline]
 __x64_sys_munmap+0x6b/0x80 mm/mmap.c:2970
 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:
 ffff8881243bbf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881243bbf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881243bc000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                            ^
 ffff8881243bc080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881243bc100: 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.0.27: Invalid inode table block 0 in block_group 0
EXT4-fs error (device loop0) in ext4_reserve_inode_write:5834: Corrupt filesystem
EXT4-fs error (device loop0): __ext4_ext_dirty:183: inode #16: comm syz.0.27: mark_inode_dirty error
EXT4-fs error (device loop0): __ext4_get_inode_loc:4351: comm syz.0.27: Invalid inode table block 0 in block_group 0
EXT4-fs error (device loop0) in ext4_reserve_inode_write:5834: Corrupt filesystem
EXT4-fs error (device loop0): ext4_punch_hole:4143: inode #16: comm syz.0.27: mark_inode_dirty error