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BUG: KCSAN: data-race in atime_needs_update / inode_update_timestamps

write to 0xffff888139cd0f38 of 8 bytes by task 17883 on cpu 0:
 inode_set_atime_to_ts include/linux/fs.h:1537 [inline]
 inode_update_timestamps+0x4d1/0x560 fs/inode.c:1914
 generic_update_time fs/inode.c:1936 [inline]
 inode_update_time fs/inode.c:1956 [inline]
 touch_atime+0x15c/0x2d0 fs/inode.c:2028
 file_accessed include/linux/fs.h:2360 [inline]
 ext4_dio_read_iter fs/ext4/file.c:97 [inline]
 ext4_file_read_iter+0x271/0x2a0 fs/ext4/file.c:145
 call_read_iter include/linux/fs.h:2014 [inline]
 copy_splice_read+0x26b/0x4b0 fs/splice.c:364
 vfs_splice_read fs/splice.c:992 [inline]
 splice_direct_to_actor+0x2aa/0x690 fs/splice.c:1069
 do_splice_direct+0x10d/0x190 fs/splice.c:1194
 do_sendfile+0x3c4/0x980 fs/read_write.c:1254
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1308
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888139cd0f38 of 8 bytes by task 17893 on cpu 1:
 atime_needs_update+0x3cf/0x550
 touch_atime+0x46/0x2d0 fs/inode.c:2011
 file_accessed include/linux/fs.h:2360 [inline]
 ext4_dio_read_iter fs/ext4/file.c:97 [inline]
 ext4_file_read_iter+0x271/0x2a0 fs/ext4/file.c:145
 call_read_iter include/linux/fs.h:2014 [inline]
 copy_splice_read+0x26b/0x4b0 fs/splice.c:364
 vfs_splice_read fs/splice.c:992 [inline]
 splice_direct_to_actor+0x2aa/0x690 fs/splice.c:1069
 do_splice_direct+0x10d/0x190 fs/splice.c:1194
 do_sendfile+0x3c4/0x980 fs/read_write.c:1254
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1308
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0000000038b26753 -> 0x0000000039e56751

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 17893 Comm: syz-executor.0 Not tainted 6.7.0-rc4-syzkaller-00009-gbee0e7762ad2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
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