syzbot

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BUG: KCSAN: data-race in pipe_lock / pipe_release

read-write to 0xffff88813b06fbac of 4 bytes by task 3494 on cpu 1:
 put_pipe_info fs/pipe.c:704 [inline]
 pipe_release+0x164/0x1c0 fs/pipe.c:734
 __fput+0x245/0x570 fs/file_table.c:321
 ____fput+0x15/0x20 fs/file_table.c:349
 task_work_run+0x123/0x160 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xd1/0xe0 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:297
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88813b06fbac of 4 bytes by task 3496 on cpu 0:
 pipe_lock_nested fs/pipe.c:81 [inline]
 pipe_lock+0x17/0x40 fs/pipe.c:90
 vmsplice_to_user fs/splice.c:1323 [inline]
 __do_sys_vmsplice fs/splice.c:1419 [inline]
 __se_sys_vmsplice+0x239/0xaa0 fs/splice.c:1391
 __x64_sys_vmsplice+0x55/0x60 fs/splice.c:1391
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000002 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3496 Comm: syz-executor.0 Not tainted 6.3.0-syzkaller-13027-g1a5304fecee5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
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