EXT4-fs error (device loop3): ext4_mb_mark_diskspace_used:4107: comm syz-executor.3: Allocating blocks 61-62 which overlap fs metadata
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BUG: KCSAN: data-race in data_push_tail / string

write to 0xffffffff87104a58 of 1 bytes by task 31990 on cpu 1:
 string_nocheck lib/vsprintf.c:650 [inline]
 string+0x16c/0x200 lib/vsprintf.c:728
 vsnprintf+0xa09/0xe30 lib/vsprintf.c:2824
 vscnprintf+0x42/0x80 lib/vsprintf.c:2930
 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2124
 vprintk_store+0x56f/0x800 kernel/printk/printk.c:2238
 vprintk_emit+0xd0/0x5d0 kernel/printk/printk.c:2284
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2318
 vprintk+0x71/0x80 kernel/printk/printk_safe.c:45
 _printk+0x7a/0xa0 kernel/printk/printk.c:2328
 __ext4_error+0x21c/0x310 fs/ext4/super.c:838
 ext4_mb_mark_diskspace_used+0x272/0x3c0 fs/ext4/mballoc.c:4106
 ext4_mb_new_blocks+0xa74/0x21e0 fs/ext4/mballoc.c:6221
 ext4_ext_map_blocks+0x10a1/0x33b0 fs/ext4/extents.c:4317
 ext4_map_blocks+0x72a/0xf50 fs/ext4/inode.c:623
 _ext4_get_block+0x103/0x370 fs/ext4/inode.c:765
 ext4_get_block_unwritten+0x2c/0xb0 fs/ext4/inode.c:798
 __block_write_begin_int+0x40b/0xf80 fs/buffer.c:2103
 block_page_mkwrite+0x1bf/0x3e0 fs/buffer.c:2617
 ext4_page_mkwrite+0x377/0xb70 fs/ext4/inode.c:6136
 do_page_mkwrite mm/memory.c:2966 [inline]
 wp_page_shared mm/memory.c:3353 [inline]
 do_wp_page+0xae9/0x1f20 mm/memory.c:3493
 handle_pte_fault mm/memory.c:5160 [inline]
 __handle_mm_fault mm/memory.c:5285 [inline]
 handle_mm_fault+0xb80/0x27c0 mm/memory.c:5450
 do_user_addr_fault arch/x86/mm/fault.c:1364 [inline]
 handle_page_fault arch/x86/mm/fault.c:1507 [inline]
 exc_page_fault+0x401/0x6d0 arch/x86/mm/fault.c:1563
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

read to 0xffffffff87104a58 of 8 bytes by task 31985 on cpu 0:
 data_make_reusable kernel/printk/printk_ringbuffer.c:590 [inline]
 data_push_tail+0x102/0x430 kernel/printk/printk_ringbuffer.c:675
 data_alloc+0xbe/0x2c0 kernel/printk/printk_ringbuffer.c:1046
 prb_reserve+0x897/0xbc0 kernel/printk/printk_ringbuffer.c:1555
 vprintk_store+0x53e/0x800 kernel/printk/printk.c:2228
 vprintk_emit+0xd0/0x5d0 kernel/printk/printk.c:2284
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2318
 vprintk+0x71/0x80 kernel/printk/printk_safe.c:45
 _printk+0x7a/0xa0 kernel/printk/printk.c:2328
 __ext4_error+0x21c/0x310 fs/ext4/super.c:838
 ext4_mb_mark_diskspace_used+0x272/0x3c0 fs/ext4/mballoc.c:4106
 ext4_mb_new_blocks+0xa74/0x21e0 fs/ext4/mballoc.c:6221
 ext4_ext_map_blocks+0x10a1/0x33b0 fs/ext4/extents.c:4317
 ext4_map_blocks+0x72a/0xf50 fs/ext4/inode.c:623
 _ext4_get_block+0x103/0x370 fs/ext4/inode.c:765
 ext4_get_block_unwritten+0x2c/0xb0 fs/ext4/inode.c:798
 __block_write_begin_int+0x40b/0xf80 fs/buffer.c:2103
 block_page_mkwrite+0x1bf/0x3e0 fs/buffer.c:2617
 ext4_page_mkwrite+0x377/0xb70 fs/ext4/inode.c:6136
 do_page_mkwrite mm/memory.c:2966 [inline]
 wp_page_shared mm/memory.c:3353 [inline]
 do_wp_page+0xae9/0x1f20 mm/memory.c:3493
 handle_pte_fault mm/memory.c:5160 [inline]
 __handle_mm_fault mm/memory.c:5285 [inline]
 handle_mm_fault+0xb80/0x27c0 mm/memory.c:5450
 do_user_addr_fault arch/x86/mm/fault.c:1364 [inline]
 handle_page_fault arch/x86/mm/fault.c:1507 [inline]
 exc_page_fault+0x401/0x6d0 arch/x86/mm/fault.c:1563
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

value changed: 0x000000010000914d -> 0x736b7369645f6b72

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 31985 Comm: syz-executor.3 Not tainted 6.8.0-rc3-syzkaller-00317-g7521f258ea30 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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