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BUG: KCSAN: data-race in __ext4_update_other_inode_time / __mark_inode_dirty

write to 0xffff88809d055840 of 8 bytes by task 9040 on cpu 1:
 __mark_inode_dirty+0x214/0x7d0 fs/fs-writeback.c:2288
 mark_inode_dirty include/linux/fs.h:2192 [inline]
 dquot_alloc_space include/linux/quotaops.h:320 [inline]
 dquot_alloc_block include/linux/quotaops.h:337 [inline]
 ext4_mb_new_blocks+0x7c8/0xcf0 fs/ext4/mballoc.c:4683
 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

read to 0xffff88809d055840 of 8 bytes by task 8802 on cpu 0:
 __ext4_update_other_inode_time+0x45/0x570 fs/ext4/inode.c:4893
 ext4_update_other_inodes_time fs/ext4/inode.c:4940 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5068 [inline]
 ext4_mark_iloc_dirty+0x1266/0x1630 fs/ext4/inode.c:5624
 __ext4_mark_inode_dirty+0x2b9/0x3f0 fs/ext4/inode.c:5818
 ext4_dirty_inode+0xa6/0xc0 fs/ext4/inode.c:5854
 __mark_inode_dirty+0x72/0x7d0 fs/fs-writeback.c:2258
 mark_inode_dirty_sync include/linux/fs.h:2197 [inline]
 dquot_free_space include/linux/quotaops.h:385 [inline]
 dquot_free_block include/linux/quotaops.h:395 [inline]
 ext4_free_blocks+0x1163/0x1610 fs/ext4/mballoc.c:5115
 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

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8802 Comm: syz-executor.1 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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