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BUG: KCSAN: data-race in ext4_mb_regular_allocator / mb_free_blocks

write to 0xffff88812a3af884 of 4 bytes by task 8689 on cpu 1:
 mb_free_blocks+0x141/0xf90 fs/ext4/mballoc.c:1495
 ext4_free_blocks+0xfda/0x1610 fs/ext4/mballoc.c:5092
 ext4_remove_blocks+0x592/0xa20 fs/ext4/extents.c:2503
 ext4_ext_rm_leaf+0x563/0xe70 fs/ext4/extents.c:2669
 ext4_ext_remove_space+0x8c9/0x1470 fs/ext4/extents.c:2917
 ext4_ext_truncate+0xf9/0x160 fs/ext4/extents.c:4377
 ext4_truncate+0x7a5/0xb40 fs/ext4/inode.c:4217
 ext4_evict_inode+0x9a5/0xbf0 fs/ext4/inode.c:280
 evict+0x19f/0x470 fs/inode.c:576
 iput_final fs/inode.c:1652 [inline]
 iput+0x44a/0x550 fs/inode.c:1678
 dentry_unlink_inode+0x208/0x220 fs/dcache.c:374
 d_delete+0x78/0xa0 fs/dcache.c:2470
 vfs_rmdir+0x298/0x2b0 fs/namei.c:3718
 do_rmdir+0x170/0x320 fs/namei.c:3766
 __do_sys_rmdir fs/namei.c:3784 [inline]
 __se_sys_rmdir fs/namei.c:3782 [inline]
 __x64_sys_rmdir+0x20/0x30 fs/namei.c:3782
 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812a3af884 of 4 bytes by task 9181 on cpu 0:
 ext4_mb_good_group_nolock fs/ext4/mballoc.c:2186 [inline]
 ext4_mb_regular_allocator+0x67e/0xf90 fs/ext4/mballoc.c:2297
 ext4_mb_new_blocks+0x304/0xcf0 fs/ext4/mballoc.c:4721
 ext4_ext_map_blocks+0x164e/0x20c0 fs/ext4/extents.c:4244
 ext4_map_blocks+0x6a6/0xf60 fs/ext4/inode.c:626
 ext4_getblk+0x67/0x2c0 fs/ext4/inode.c:833
 ext4_bread+0x3a/0x190 fs/ext4/inode.c:883
 ext4_append+0xda/0x1c0 fs/ext4/namei.c:67
 ext4_init_new_dir fs/ext4/namei.c:2757 [inline]
 ext4_mkdir+0x480/0xc00 fs/ext4/namei.c:2802
 vfs_mkdir+0x288/0x370 fs/namei.c:3641
 do_mkdirat+0x132/0x220 fs/namei.c:3664
 __do_sys_mkdir fs/namei.c:3680 [inline]
 __se_sys_mkdir fs/namei.c:3678 [inline]
 __x64_sys_mkdir+0x32/0x40 fs/namei.c:3678
 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 9181 Comm: syz-executor.5 Not tainted 5.8.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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