==================================================================
BUG: KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used

write to 0xffff88821aadf2e4 of 4 bytes by task 29031 on cpu 0:
 mb_mark_used+0x189/0x860 fs/ext4/mballoc.c:1574
 ext4_mb_use_best_found+0x111/0x310 fs/ext4/mballoc.c:1645
 ext4_mb_simple_scan_group+0x227/0x350 fs/ext4/mballoc.c:1919
 ext4_mb_regular_allocator+0x7e4/0x990 fs/ext4/mballoc.c:2218
 ext4_mb_new_blocks+0xe36/0x1e20 fs/ext4/mballoc.c:4568
 ext4_ext_map_blocks+0x18cb/0x1fb0 fs/ext4/extents.c:4218
 ext4_map_blocks+0x230/0xcf0 fs/ext4/inode.c:621
 ext4_alloc_file_blocks+0x210/0x6c0 fs/ext4/extents.c:4406
 ext4_fallocate+0x9dc/0x21f0 fs/ext4/extents.c:4675
 vfs_fallocate+0x3b1/0x640 fs/open.c:309
 ioctl_preallocate+0x12a/0x190 fs/ioctl.c:504
 file_ioctl fs/ioctl.c:544 [inline]
 do_vfs_ioctl+0xa69/0xd00 fs/ioctl.c:742
 ksys_ioctl+0xb2/0x150 fs/ioctl.c:761
 __do_sys_ioctl fs/ioctl.c:772 [inline]
 __se_sys_ioctl fs/ioctl.c:770 [inline]
 __x64_sys_ioctl+0x47/0x60 fs/ioctl.c:770
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88821aadf2e4 of 4 bytes by task 29055 on cpu 1:
 ext4_mb_find_by_goal+0x17e/0x7c0 fs/ext4/mballoc.c:1829
 ext4_mb_regular_allocator+0xff/0x990 fs/ext4/mballoc.c:2125
 ext4_mb_new_blocks+0xe36/0x1e20 fs/ext4/mballoc.c:4568
 ext4_ext_map_blocks+0x18cb/0x1fb0 fs/ext4/extents.c:4218
 ext4_map_blocks+0x230/0xcf0 fs/ext4/inode.c:621
 ext4_alloc_file_blocks+0x210/0x6c0 fs/ext4/extents.c:4406
 ext4_zero_range fs/ext4/extents.c:4554 [inline]
 ext4_fallocate+0x59f/0x21f0 fs/ext4/extents.c:4643
 vfs_fallocate+0x3b1/0x640 fs/open.c:309
 ioctl_preallocate+0x12a/0x190 fs/ioctl.c:504
 file_ioctl fs/ioctl.c:549 [inline]
 do_vfs_ioctl+0xa32/0xd00 fs/ioctl.c:742
 ksys_ioctl+0xb2/0x150 fs/ioctl.c:761
 __do_sys_ioctl fs/ioctl.c:772 [inline]
 __se_sys_ioctl fs/ioctl.c:770 [inline]
 __x64_sys_ioctl+0x47/0x60 fs/ioctl.c:770
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 29055 Comm: syz-executor.3 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================