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BUG: KCSAN: data-race in ext4_mb_good_group / mb_free_blocks

write to 0xffff88821aefa014 of 4 bytes by task 10260 on cpu 0:
 mb_free_blocks+0x1af/0x1060 fs/ext4/mballoc.c:1433
 ext4_free_blocks+0x101e/0x17e0 fs/ext4/mballoc.c:4905
 ext4_ext_try_to_merge_up fs/ext4/extents.c:1862 [inline]
 ext4_ext_try_to_merge+0x2d4/0x330 fs/ext4/extents.c:1888
 ext4_swap_extents+0xc28/0xe20 fs/ext4/extents.c:5921
 move_extent_per_page fs/ext4/move_extent.c:339 [inline]
 ext4_move_extents+0x1189/0x1de0 fs/ext4/move_extent.c:673
 ext4_ioctl+0x2a3a/0x3130 fs/ext4/ioctl.c:992
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0x991/0xc60 fs/ioctl.c:696
 ksys_ioctl+0xbd/0xe0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x4c/0x60 fs/ioctl.c:718
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88821aefa014 of 4 bytes by task 10259 on cpu 1:
 ext4_mb_good_group+0x107/0x410 fs/ext4/mballoc.c:2043
 ext4_mb_regular_allocator+0x6e1/0x9d0 fs/ext4/mballoc.c:2183
 ext4_mb_new_blocks+0xf6f/0x1de0 fs/ext4/mballoc.c:4539
 ext4_new_meta_blocks+0x175/0x200 fs/ext4/balloc.c:657
 ext4_ext_grow_indepth fs/ext4/extents.c:1297 [inline]
 ext4_ext_create_new_leaf fs/ext4/extents.c:1401 [inline]
 ext4_ext_insert_extent+0xacb/0x25c0 fs/ext4/extents.c:2085
 ext4_split_extent_at+0x371/0x910 fs/ext4/extents.c:3373
 ext4_force_split_extent_at fs/ext4/extents.c:294 [inline]
 ext4_swap_extents+0x999/0xe20 fs/ext4/extents.c:5892
 move_extent_per_page fs/ext4/move_extent.c:339 [inline]
 ext4_move_extents+0x1189/0x1de0 fs/ext4/move_extent.c:673
 ext4_ioctl+0x2a3a/0x3130 fs/ext4/ioctl.c:992
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0x991/0xc60 fs/ioctl.c:696
 ksys_ioctl+0xbd/0xe0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x4c/0x60 fs/ioctl.c:718
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10259 Comm: syz-executor.5 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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