EXT4-fs error (device loop0): ext4_free_blocks:5685: comm syz-executor: 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:2710 [inline]
BUG: KASAN: out-of-bounds in ext4_ext_remove_space+0x2587/0x4910 fs/ext4/extents.c:2932
Read of size 18446744073709551604 at addr ffff88811fff2018 by task syz-executor/502

CPU: 1 PID: 502 Comm: syz-executor Not tainted 5.10.236-syzkaller-1007372-gab07aeb2c93d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 __dump_stack+0x21/0x24 lib/dump_stack.c:77
 dump_stack_lvl+0x169/0x1d8 lib/dump_stack.c:118
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0xe2/0x130 mm/kasan/report.c:452
 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:2710 [inline]
 ext4_ext_remove_space+0x2587/0x4910 fs/ext4/extents.c:2932
 ext4_punch_hole+0x6f8/0xad0 fs/ext4/inode.c:4216
 ext4_fallocate+0x271/0x1a70 fs/ext4/extents.c:4756
 vfs_fallocate+0x4b4/0x590 fs/open.c:310
 ksys_fallocate fs/open.c:333 [inline]
 __do_sys_fallocate fs/open.c:341 [inline]
 __se_sys_fallocate fs/open.c:339 [inline]
 __x64_sys_fallocate+0xc0/0x110 fs/open.c:339
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f18858daf69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f188543c0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f1885a12050 RCX: 00007f18858daf69
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004
RBP: 00007f18859386fe R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000001a00 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f1885a12050 R15: 00007fff39da5548

The buggy address belongs to the page:
page:ffffea00047ffc80 refcount:2 mapcount:0 mapping:ffff888100449390 index:0x27 pfn:0x11fff2
aops:def_blk_aops ino:0
flags: 0x4000000000002036(referenced|uptodate|lru|active|private)
raw: 4000000000002036 ffffea00047f7188 ffff888105980030 ffff888100449390
raw: 0000000000000027 ffff888123624738 00000002ffffffff ffff88810d11c000
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff88810d11c000
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 53644885042, free_ts 53526447108
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x179/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x2235/0x23d0 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x268/0x5f0 mm/page_alloc.c:5349
 __alloc_pages include/linux/gfp.h:544 [inline]
 __alloc_pages_node include/linux/gfp.h:557 [inline]
 alloc_pages_node include/linux/gfp.h:571 [inline]
 alloc_pages include/linux/gfp.h:590 [inline]
 __page_cache_alloc include/linux/pagemap.h:290 [inline]
 pagecache_get_page+0x642/0x930 mm/filemap.c:1848
 find_or_create_page include/linux/pagemap.h:402 [inline]
 grow_dev_page fs/buffer.c:976 [inline]
 grow_buffers fs/buffer.c:1045 [inline]
 __getblk_slow fs/buffer.c:1072 [inline]
 __getblk_gfp+0x212/0x780 fs/buffer.c:1370
 sb_getblk_gfp include/linux/buffer_head.h:368 [inline]
 ext4_ext_grow_indepth fs/ext4/extents.c:1327 [inline]
 ext4_ext_create_new_leaf fs/ext4/extents.c:1426 [inline]
 ext4_ext_insert_extent+0x1084/0x4530 fs/ext4/extents.c:2097
 ext4_split_extent_at+0x79f/0xe90 fs/ext4/extents.c:3229
 ext4_split_extent+0x1d7/0x4e0 fs/ext4/extents.c:3348
 ext4_split_convert_extents fs/ext4/extents.c:3708 [inline]
 ext4_ext_handle_unwritten_extents fs/ext4/extents.c:3869 [inline]
 ext4_ext_map_blocks+0x1b38/0x5d40 fs/ext4/extents.c:4224
 ext4_map_blocks+0x993/0x1b80 fs/ext4/inode.c:673
 _ext4_get_block+0x1bb/0x4b0 fs/ext4/inode.c:816
 ext4_get_block_unwritten+0x2a/0x40 fs/ext4/inode.c:847
 ext4_block_write_begin+0x567/0x1330 fs/ext4/inode.c:1100
 ext4_write_begin+0x651/0x1550 fs/ext4/ext4_jbd2.h:-1
 ext4_da_write_begin+0x455/0xe80 fs/ext4/inode.c:3032
 generic_perform_write+0x2be/0x510 mm/filemap.c:3509
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1349 [inline]
 free_pcp_prepare mm/page_alloc.c:1421 [inline]
 free_unref_page_prepare+0x2b7/0x2d0 mm/page_alloc.c:3336
 free_unref_page_list+0x12e/0x9b0 mm/page_alloc.c:3443
 release_pages+0xe38/0xe80 mm/swap.c:1103
 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:356
 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:326
 unmap_region+0x32c/0x380 mm/mmap.c:2799
 __do_munmap+0x63c/0x850 mm/mmap.c:3029
 __vm_munmap mm/mmap.c:3082 [inline]
 __do_sys_munmap mm/mmap.c:3108 [inline]
 __se_sys_munmap+0x127/0x1b0 mm/mmap.c:3104
 __x64_sys_munmap+0x5b/0x70 mm/mmap.c:3104
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Memory state around the buggy address:
 ffff88811fff1f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88811fff1f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88811fff2000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                            ^
 ffff88811fff2080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88811fff2100: 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:4437: comm syz-executor: Invalid inode table block 0 in block_group 0
EXT4-fs error (device loop0) in ext4_reserve_inode_write:5900: Corrupt filesystem
EXT4-fs error (device loop0): __ext4_ext_dirty:182: inode #18: comm syz-executor: mark_inode_dirty error
EXT4-fs error (device loop0): __ext4_get_inode_loc:4437: comm syz-executor: Invalid inode table block 0 in block_group 0
EXT4-fs error (device loop0) in ext4_reserve_inode_write:5900: Corrupt filesystem
EXT4-fs error (device loop0): ext4_punch_hole:4229: inode #18: comm syz-executor: mark_inode_dirty error