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BUG: KCSAN: data-race in ext4_mark_iloc_dirty / generic_update_time

read to 0xffff888125490600 of 8 bytes by task 15519 on cpu 1:
 ext4_do_update_inode fs/ext4/inode.c:4930 [inline]
 ext4_mark_iloc_dirty+0x4e5/0x1580 fs/ext4/inode.c:5547
 ext4_mark_inode_dirty+0xe9/0x420 fs/ext4/inode.c:5740
 ext4_dirty_inode+0xb1/0xe0 fs/ext4/inode.c:5771
 __mark_inode_dirty+0x5d4/0x940 fs/fs-writeback.c:2258
 mark_inode_dirty_sync include/linux/fs.h:2177 [inline]
 dquot_free_space include/linux/quotaops.h:385 [inline]
 dquot_free_block include/linux/quotaops.h:395 [inline]
 ext4_free_blocks+0x143d/0x1810 fs/ext4/mballoc.c:4927
 ext4_remove_blocks fs/ext4/extents.c:2684 [inline]
 ext4_ext_rm_leaf fs/ext4/extents.c:2850 [inline]
 ext4_ext_remove_space+0x1828/0x3750 fs/ext4/extents.c:3097
 ext4_ext_truncate+0x120/0x130 fs/ext4/extents.c:4620
 ext4_truncate+0x5c8/0x9d0 fs/ext4/inode.c:4175
 ext4_setattr+0xdda/0x1670 fs/ext4/inode.c:5333
 notify_change+0x7e1/0xaa0 fs/attr.c:337
 do_truncate+0xfb/0x180 fs/open.c:64
 handle_truncate fs/namei.c:3015 [inline]
 do_last fs/namei.c:3426 [inline]
 path_openat+0x13e8/0x3580 fs/namei.c:3537
 do_filp_open+0x11e/0x1b0 fs/namei.c:3567
 do_sys_open+0x3b3/0x4f0 fs/open.c:1097
 ksys_open include/linux/syscalls.h:1385 [inline]
 __do_sys_creat fs/open.c:1155 [inline]
 __se_sys_creat fs/open.c:1153 [inline]
 __x64_sys_creat+0x45/0x60 fs/open.c:1153
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff888125490600 of 16 bytes by task 15510 on cpu 0:
 generic_update_time+0x5c/0x270 fs/inode.c:1654
 update_time fs/inode.c:1683 [inline]
 touch_atime+0x172/0x190 fs/inode.c:1754
 file_accessed include/linux/fs.h:2209 [inline]
 ext4_dio_read_iter fs/ext4/file.c:81 [inline]
 ext4_file_read_iter fs/ext4/file.c:128 [inline]
 ext4_file_read_iter+0x22b/0x380 fs/ext4/file.c:113
 call_read_iter include/linux/fs.h:1896 [inline]
 generic_file_splice_read+0x35c/0x500 fs/splice.c:313
 do_splice_to+0xf2/0x130 fs/splice.c:892
 splice_direct_to_actor+0x1b6/0x540 fs/splice.c:971
 do_splice_direct+0x161/0x1e0 fs/splice.c:1080
 do_sendfile+0x384/0x7f0 fs/read_write.c:1464
 __do_sys_sendfile64 fs/read_write.c:1525 [inline]
 __se_sys_sendfile64 fs/read_write.c:1511 [inline]
 __x64_sys_sendfile64+0x12a/0x140 fs/read_write.c:1511
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 15510 Comm: syz-executor.1 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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