syzbot

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BUG: KCSAN: data-race in pipe_wait_readable / put_pipe_info

write to 0xffff888132228a2c of 4 bytes by task 1399 on cpu 1:
 put_pipe_info+0x3d/0xe0 fs/pipe.c:702
 pipe_release+0x15e/0x170 fs/pipe.c:732
 __fput+0x295/0x520 fs/file_table.c:280
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0xae/0x130 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x156/0x190 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302
 do_syscall_64+0x50/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888132228a2c of 4 bytes by task 1404 on cpu 0:
 pipe_lock_nested fs/pipe.c:80 [inline]
 pipe_lock fs/pipe.c:89 [inline]
 pipe_wait_readable+0x1f7/0x240 fs/pipe.c:1045
 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+0x3b9/0x980 fs/splice.c:1296
 __x64_sys_vmsplice+0x51/0x60 fs/splice.c:1296
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000002 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1404 Comm: syz-executor.5 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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