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BUG: KCSAN: data-race in ext4_mb_good_group / mb_free_blocks

read-write to 0xffff888141726018 of 4 bytes by task 12814 on cpu 0:
 mb_free_blocks+0x30c/0xaf0 fs/ext4/mballoc.c:1499
 ext4_free_blocks+0x13b2/0x1c80 fs/ext4/mballoc.c:5449
 ext4_remove_blocks+0x7d6/0x9e0 fs/ext4/extents.c:2498
 ext4_ext_rm_leaf+0x69e/0xe60 fs/ext4/extents.c:2664
 ext4_ext_remove_space+0x936/0x13e0 fs/ext4/extents.c:2912
 ext4_ext_truncate+0xf9/0x160 fs/ext4/extents.c:4370
 ext4_truncate+0x844/0xbd0 fs/ext4/inode.c:4263
 ext4_setattr+0xb9e/0xf60 fs/ext4/inode.c:5502
 notify_change+0x7b3/0xa50 fs/attr.c:336
 do_truncate+0xe0/0x120 fs/open.c:64
 handle_truncate fs/namei.c:2912 [inline]
 do_open fs/namei.c:3258 [inline]
 path_openat+0x1a37/0x20a0 fs/namei.c:3371
 do_filp_open+0xbd/0x1d0 fs/namei.c:3398
 do_sys_openat2+0xa3/0x240 fs/open.c:1172
 do_sys_open fs/open.c:1188 [inline]
 __do_sys_creat fs/open.c:1262 [inline]
 __se_sys_creat fs/open.c:1256 [inline]
 __x64_sys_creat+0x62/0x80 fs/open.c:1256
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888141726018 of 4 bytes by task 10360 on cpu 1:
 ext4_mb_good_group+0x140/0x350 fs/ext4/mballoc.c:2095
 ext4_mb_good_group_nolock fs/ext4/mballoc.c:2190 [inline]
 ext4_mb_regular_allocator+0xc3b/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_getblk+0xb1/0x3c0 fs/ext4/inode.c:847
 ext4_bread+0x28/0x130 fs/ext4/inode.c:899
 ext4_append+0xd1/0x1b0 fs/ext4/namei.c:67
 ext4_init_new_dir+0x177/0x500 fs/ext4/namei.c:2758
 ext4_mkdir+0x319/0x730 fs/ext4/namei.c:2803
 vfs_mkdir+0x288/0x350 fs/namei.c:3652
 do_mkdirat+0x132/0x220 fs/namei.c:3675
 __do_sys_mkdir fs/namei.c:3691 [inline]
 __se_sys_mkdir fs/namei.c:3689 [inline]
 __x64_sys_mkdir+0x32/0x40 fs/namei.c:3689
 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: 1 PID: 10360 Comm: syz-executor.5 Not tainted 5.11.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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