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BUG: KCSAN: data-race in inode_needs_update_time / inode_update_timestamps

write to 0xffff888106181868 of 8 bytes by task 11310 on cpu 1:
 inode_set_mtime_to_ts include/linux/fs.h:1570 [inline]
 inode_update_timestamps+0x3a6/0x560 fs/inode.c:1901
 generic_update_time fs/inode.c:1936 [inline]
 inode_update_time fs/inode.c:1956 [inline]
 __file_update_time fs/inode.c:2144 [inline]
 file_modified_flags+0x144/0x1d0 fs/inode.c:2215
 file_modified+0x17/0x20 fs/inode.c:2231
 ext4_dio_write_checks fs/ext4/file.c:485 [inline]
 ext4_dio_write_iter fs/ext4/file.c:551 [inline]
 ext4_file_write_iter+0x8e2/0xe10 fs/ext4/file.c:696
 call_write_iter include/linux/fs.h:2084 [inline]
 iter_file_splice_write+0x4e0/0x840 fs/splice.c:743
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0x167/0x2c0 fs/splice.c:1164
 splice_direct_to_actor+0x2fb/0x650 fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x377/0x880 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1362 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1348
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888106181868 of 8 bytes by task 11303 on cpu 0:
 inode_get_mtime include/linux/fs.h:1564 [inline]
 inode_needs_update_time+0x1c0/0x2f0 fs/inode.c:2123
 file_modified_flags+0x95/0x1d0 fs/inode.c:2209
 file_modified+0x17/0x20 fs/inode.c:2231
 ext4_dio_write_checks fs/ext4/file.c:485 [inline]
 ext4_dio_write_iter fs/ext4/file.c:551 [inline]
 ext4_file_write_iter+0x8e2/0xe10 fs/ext4/file.c:696
 call_write_iter include/linux/fs.h:2084 [inline]
 iter_file_splice_write+0x4e0/0x840 fs/splice.c:743
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0x167/0x2c0 fs/splice.c:1164
 splice_direct_to_actor+0x2fb/0x650 fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x377/0x880 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1362 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1348
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x000000001a9fcd71 -> 0x000000001d9abdf2

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 11303 Comm: syz-executor.5 Tainted: G        W          6.7.0-syzkaller-00119-g5db8752c3b81 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
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