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BUG: KCSAN: data-race in pipe_double_lock / put_pipe_info

read to 0xffff88809ee12d0c of 4 bytes by task 23507 on cpu 1:
 pipe_lock_nested fs/pipe.c:62 [inline]
 pipe_double_lock+0xb6/0x110 fs/pipe.c:99
 splice_pipe_to_pipe fs/splice.c:1541 [inline]
 do_splice+0x200/0xbe0 fs/splice.c:1126
 __do_sys_splice fs/splice.c:1425 [inline]
 __se_sys_splice fs/splice.c:1405 [inline]
 __x64_sys_splice+0x20a/0x220 fs/splice.c:1405
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff88809ee12d0c of 4 bytes by task 23488 on cpu 0:
 put_pipe_info+0x4d/0xb0 fs/pipe.c:575
 pipe_release+0x152/0x1b0 fs/pipe.c:603
 __fput+0x1e1/0x520 fs/file_table.c:280
 ____fput+0x1f/0x30 fs/file_table.c:313
 task_work_run+0xf6/0x130 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x2b4/0x2c0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x353/0x370 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 23488 Comm: syz-executor.0 Not tainted 5.4.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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