syzbot

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BUG: KCSAN: data-race in pipe_lock / put_pipe_info

write to 0xffff88812bfdf66c of 4 bytes by task 32405 on cpu 1:
 put_pipe_info+0x3d/0xe0 fs/pipe.c:688
 pipe_release+0x15e/0x170 fs/pipe.c:718
 __fput+0x25b/0x4e0 fs/file_table.c:280
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0xae/0x130 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x151/0x170 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301
 do_syscall_64+0x40/0x50 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88812bfdf66c of 4 bytes by task 32409 on cpu 0:
 pipe_lock_nested fs/pipe.c:65 [inline]
 pipe_lock+0x13/0x40 fs/pipe.c:74
 vmsplice_to_pipe fs/splice.c:1255 [inline]
 __do_sys_vmsplice fs/splice.c:1322 [inline]
 __se_sys_vmsplice+0x264/0x940 fs/splice.c:1296
 __x64_sys_vmsplice+0x51/0x60 fs/splice.c:1296
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 32409 Comm: syz-executor.3 Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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