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BUG: KCSAN: data-race in shmem_file_splice_read / shmem_file_splice_read

write to 0xffff88810379e990 of 8 bytes by task 31911 on cpu 0:
 shmem_file_splice_read+0x43e/0x5c0 mm/shmem.c:3053
 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+0x3b9/0x970 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1356 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0xbd/0x150 fs/read_write.c:1348
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

write to 0xffff88810379e990 of 8 bytes by task 31910 on cpu 1:
 shmem_file_splice_read+0x43e/0x5c0 mm/shmem.c:3053
 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+0x3b9/0x970 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1356 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0xbd/0x150 fs/read_write.c:1348
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

value changed: 0x00000000000045d6 -> 0x000000000000460e

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 31910 Comm: syz-executor.4 Not tainted 6.9.0-rc1-syzkaller-00011-g498e47cd1d1f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
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