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BUG: KCSAN: data-race in __ext4_update_other_inode_time / clear_inode

write to 0xffff888097e9c600 of 8 bytes by task 8797 on cpu 0:
 clear_inode+0x105/0x140 fs/inode.c:538
 ext4_clear_inode+0x1f/0x100 fs/ext4/super.c:1218
 ext4_free_inode+0x1b6/0x9d0 fs/ext4/ialloc.c:276
 ext4_evict_inode+0xaf7/0xc20 fs/ext4/inode.c:324
 evict+0x19f/0x470 fs/inode.c:576
 iput_final fs/inode.c:1652 [inline]
 iput+0x44a/0x550 fs/inode.c:1678
 do_unlinkat+0x2c9/0x4d0 fs/namei.c:3895
 __do_sys_unlink fs/namei.c:3936 [inline]
 __se_sys_unlink fs/namei.c:3934 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:3934
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888097e9c600 of 8 bytes by task 20671 on cpu 1:
 __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+0x1296/0x1660 fs/ext4/inode.c:5624
 __ext4_mark_inode_dirty+0x448/0x630 fs/ext4/inode.c:5818
 __ext4_ext_dirty fs/ext4/extents.c:169 [inline]
 ext4_ext_insert_extent+0x1382/0x2b80 fs/ext4/extents.c:2135
 ext4_ext_map_blocks+0x1776/0x20c0 fs/ext4/extents.c:4265
 ext4_map_blocks+0x6d3/0xf60 fs/ext4/inode.c:626
 mpage_map_one_extent+0x10d/0x3c0 fs/ext4/inode.c:2377
 mpage_map_and_submit_extent fs/ext4/inode.c:2430 [inline]
 ext4_writepages+0xa4c/0x1ef0 fs/ext4/inode.c:2782
 do_writepages+0x7b/0x150 mm/page-writeback.c:2354
 __filemap_fdatawrite_range+0x19b/0x1d0 mm/filemap.c:421
 filemap_write_and_wait_range+0x8b/0x2a0 mm/filemap.c:654
 iomap_dio_rw+0x399/0x8c0 fs/iomap/direct-io.c:474
 ext4_dio_read_iter fs/ext4/file.c:77 [inline]
 ext4_file_read_iter+0x3bc/0x420 fs/ext4/file.c:129
 call_read_iter include/linux/fs.h:1902 [inline]
 generic_file_splice_read+0x22a/0x310 fs/splice.c:312
 do_splice_to fs/splice.c:870 [inline]
 splice_direct_to_actor+0x2a8/0x660 fs/splice.c:950
 do_splice_direct+0xf2/0x170 fs/splice.c:1059
 do_sendfile+0x562/0xb10 fs/read_write.c:1540
 __do_sys_sendfile64 fs/read_write.c:1601 [inline]
 __se_sys_sendfile64 fs/read_write.c:1587 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1587
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 20671 Comm: syz-executor.0 Not tainted 5.8.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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