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BUG: KCSAN: data-race in atime_needs_update / touch_atime

read to 0xffff88810b1106c0 of 4 bytes by task 9220 on cpu 1:
 atime_needs_update+0x261/0x3e0
 touch_atime+0x4a/0x350 fs/inode.c:2072
 file_accessed include/linux/fs.h:2486 [inline]
 shmem_file_splice_read+0x56a/0x5c0 mm/shmem.c:3211
 do_splice_read fs/splice.c:985 [inline]
 splice_direct_to_actor+0x26c/0x670 fs/splice.c:1089
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x3ab/0x950 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
 x64_sys_call+0xed5/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:41
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffff88810b1106c0 of 4 bytes by task 9221 on cpu 0:
 inode_set_atime_to_ts include/linux/fs.h:1570 [inline]
 inode_update_timestamps fs/inode.c:1975 [inline]
 generic_update_time fs/inode.c:1997 [inline]
 inode_update_time fs/inode.c:2017 [inline]
 touch_atime+0x1f3/0x350 fs/inode.c:2089
 file_accessed include/linux/fs.h:2486 [inline]
 shmem_file_splice_read+0x56a/0x5c0 mm/shmem.c:3211
 do_splice_read fs/splice.c:985 [inline]
 splice_direct_to_actor+0x26c/0x670 fs/splice.c:1089
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x3ab/0x950 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
 x64_sys_call+0xed5/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:41
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x02b7e420 -> 0x035813ee

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 9221 Comm: syz.4.1573 Not tainted 6.11.0-rc6-syzkaller-00017-gc9f016e72b5c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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