syzbot

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BUG: KCSAN: data-race in pipe_release / pipe_wait_readable

write to 0xffff88801dc131f0 of 4 bytes by task 22568 on cpu 1:
 put_pipe_info fs/pipe.c:688 [inline]
 pipe_release+0x186/0x1e0 fs/pipe.c:718
 __fput+0x263/0x4f0 fs/file_table.c:280
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0x8e/0x110 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+0x17c/0x1b0 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+0x45/0x80 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88801dc131f0 of 4 bytes by task 22564 on cpu 0:
 pipe_lock_nested fs/pipe.c:65 [inline]
 pipe_lock fs/pipe.c:74 [inline]
 pipe_wait_readable+0x1e9/0x230 fs/pipe.c:1031
 splice_from_pipe_next+0x25e/0x3b0 fs/splice.c:499
 __splice_from_pipe+0xaa/0x500 fs/splice.c:560
 vmsplice_to_user fs/splice.c:1229 [inline]
 __do_sys_vmsplice fs/splice.c:1324 [inline]
 __se_sys_vmsplice+0x201/0x530 fs/splice.c:1296
 __x64_sys_vmsplice+0x51/0x60 fs/splice.c:1296
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 22564 Comm: syz-executor.2 Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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