EXT2-fs (loop4): error: ext2_valid_block_bitmap: Invalid block bitmap - block_group = 0, block = 252
==================================================================
BUG: KASAN: use-after-free in arch_test_bit include/asm-generic/bitops/non-atomic.h:118 [inline]
BUG: KASAN: use-after-free in test_bit_le include/asm-generic/bitops/le.h:85 [inline]
BUG: KASAN: use-after-free in ext2_valid_block_bitmap+0x10c/0x2e0 fs/ext2/balloc.c:88
Read of size 8 at addr ffff00010c2d8ff8 by task syz.4.76/4385

CPU: 0 PID: 4385 Comm: syz.4.76 Not tainted 5.15.161-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x174/0x1e4 mm/kasan/report.c:451
 __asan_report_load8_noabort+0x44/0x50 mm/kasan/report_generic.c:309
 arch_test_bit include/asm-generic/bitops/non-atomic.h:118 [inline]
 test_bit_le include/asm-generic/bitops/le.h:85 [inline]
 ext2_valid_block_bitmap+0x10c/0x2e0 fs/ext2/balloc.c:88
 read_block_bitmap+0x294/0x340 fs/ext2/balloc.c:154
 ext2_free_blocks+0x280/0xa38 fs/ext2/balloc.c:515
 ext2_free_data fs/ext2/inode.c:1130 [inline]
 ext2_free_branches+0x38c/0x3c4 fs/ext2/inode.c:1178
 ext2_free_branches+0x180/0x3c4 fs/ext2/inode.c:1169
 __ext2_truncate_blocks+0x764/0xd00 fs/ext2/inode.c:1224
 ext2_truncate_blocks fs/ext2/inode.c:1281 [inline]
 ext2_write_failed+0x1ec/0x258 fs/ext2/inode.c:65
 ext2_write_begin+0x7c/0x98 fs/ext2/inode.c:893
 generic_perform_write+0x24c/0x520 mm/filemap.c:3785
 __generic_file_write_iter+0x230/0x454 mm/filemap.c:3912
 generic_file_write_iter+0xb4/0x1b8 mm/filemap.c:3944
 ext2_file_write_iter+0xc4/0x314 fs/ext2/file.c:179
 call_write_iter include/linux/fs.h:2172 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x87c/0xb3c fs/read_write.c:594
 ksys_write+0x15c/0x26c fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:656
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

The buggy address belongs to the page:
page:000000006072e78e refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x14c2d8
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffc000430b608 fffffc000430b608 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff00010c2d8e80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff00010c2d8f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff00010c2d8f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                                ^
 ffff00010c2d9000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff00010c2d9080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
EXT2-fs (loop4): error: ext2_valid_block_bitmap: Invalid block bitmap - block_group = 0, block = 0
EXT2-fs (loop4): error: ext2_free_blocks: Freeing blocks in system zones - Block = 3, count = 1
EXT2-fs (loop4): error: ext2_free_blocks: Freeing blocks in system zones - Block = 2, count = 1