syzbot

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BUG: KCSAN: data-race in pipe_lock / pipe_release

read-write to 0xffff888138244eac of 4 bytes by task 25618 on cpu 1:
 put_pipe_info fs/pipe.c:722 [inline]
 pipe_release+0x164/0x1c0 fs/pipe.c:752
 __fput+0x299/0x630 fs/file_table.c:376
 __fput_sync+0x44/0x50 fs/file_table.c:461
 __do_sys_close fs/open.c:1554 [inline]
 __se_sys_close+0xfa/0x1a0 fs/open.c:1539
 __x64_sys_close+0x1f/0x30 fs/open.c:1539
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888138244eac of 4 bytes by task 25620 on cpu 0:
 pipe_lock_nested fs/pipe.c:81 [inline]
 pipe_lock+0x17/0x40 fs/pipe.c:90
 ipipe_prep fs/splice.c:1677 [inline]
 splice_pipe_to_pipe fs/splice.c:1752 [inline]
 do_splice+0x200/0x10d0 fs/splice.c:1331
 __do_splice fs/splice.c:1436 [inline]
 __do_sys_splice fs/splice.c:1652 [inline]
 __se_sys_splice+0x24c/0x380 fs/splice.c:1634
 __x64_sys_splice+0x78/0x90 fs/splice.c:1634
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x00000002 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 25620 Comm: syz-executor.1 Not tainted 6.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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