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BUG: KCSAN: data-race in ext4_mb_regular_allocator / mb_mark_used

read-write to 0xffff888141737014 of 4 bytes by task 25239 on cpu 1:
 mb_mark_used+0x120/0xc10 fs/ext4/mballoc.c:1607
 ext4_mb_use_best_found+0x102/0x2f0 fs/ext4/mballoc.c:1678
 ext4_mb_check_limits fs/ext4/mballoc.c:1750 [inline]
 ext4_mb_measure_extent fs/ext4/mballoc.c:1822 [inline]
 ext4_mb_complex_scan_group+0x56d/0x830 fs/ext4/mballoc.c:2024
 ext4_mb_regular_allocator+0x1044/0x1890 fs/ext4/mballoc.c:2417
 ext4_mb_new_blocks+0x6e8/0x1140 fs/ext4/mballoc.c:4975
 ext4_new_meta_blocks+0x84/0x180 fs/ext4/balloc.c:679
 ext4_ext_grow_indepth fs/ext4/extents.c:1276 [inline]
 ext4_ext_create_new_leaf fs/ext4/extents.c:1380 [inline]
 ext4_ext_insert_extent+0x9d2/0x2b50 fs/ext4/extents.c:2054
 ext4_ext_map_blocks+0x16a3/0x1fc0 fs/ext4/extents.c:4259
 ext4_map_blocks+0x700/0xfc0 fs/ext4/inode.c:637
 ext4_alloc_file_blocks+0x26f/0x700 fs/ext4/extents.c:4426
 ext4_zero_range+0x309/0xa70 fs/ext4/extents.c:4537
 ext4_fallocate+0x226/0x540 fs/ext4/extents.c:4674
 vfs_fallocate+0x471/0x6c0 fs/open.c:309
 file_ioctl fs/ioctl.c:494 [inline]
 do_vfs_ioctl+0xdc9/0xec0 fs/ioctl.c:732
 __do_sys_ioctl fs/ioctl.c:751 [inline]
 __se_sys_ioctl+0x83/0x140 fs/ioctl.c:739
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:739
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888141737014 of 4 bytes by task 25233 on cpu 0:
 ext4_mb_good_group_nolock fs/ext4/mballoc.c:2153 [inline]
 ext4_mb_regular_allocator+0x839/0x1890 fs/ext4/mballoc.c:2386
 ext4_mb_new_blocks+0x6e8/0x1140 fs/ext4/mballoc.c:4975
 ext4_ext_map_blocks+0x15a0/0x1fc0 fs/ext4/extents.c:4238
 ext4_map_blocks+0x700/0xfc0 fs/ext4/inode.c:637
 ext4_alloc_file_blocks+0x26f/0x700 fs/ext4/extents.c:4426
 ext4_zero_range+0x309/0xa70 fs/ext4/extents.c:4537
 ext4_fallocate+0x226/0x540 fs/ext4/extents.c:4674
 vfs_fallocate+0x471/0x6c0 fs/open.c:309
 file_ioctl fs/ioctl.c:494 [inline]
 do_vfs_ioctl+0xdc9/0xec0 fs/ioctl.c:732
 __do_sys_ioctl fs/ioctl.c:751 [inline]
 __se_sys_ioctl+0x83/0x140 fs/ioctl.c:739
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:739
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 25233 Comm: syz-executor.0 Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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