syzbot

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BUG: KCSAN: data-race in pipe_release / pipe_wait_writable

read-write to 0xffff88811bdfb5ac of 4 bytes by task 9866 on cpu 1:
 put_pipe_info fs/pipe.c:714 [inline]
 pipe_release+0x16a/0x1d0 fs/pipe.c:744
 __fput+0x29b/0x650 fs/file_table.c:469
 fput_close_sync+0xad/0x190 fs/file_table.c:574
 __do_sys_close fs/open.c:1509 [inline]
 __se_sys_close fs/open.c:1494 [inline]
 __x64_sys_close+0x55/0xf0 fs/open.c:1494
 x64_sys_call+0x275d/0x3020 arch/x86/include/generated/asm/syscalls_64.h:4
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811bdfb5ac of 4 bytes by task 9863 on cpu 0:
 pipe_lock fs/pipe.c:90 [inline]
 pipe_wait_writable+0x202/0x250 fs/pipe.c:1084
 wait_for_space fs/splice.c:1272 [inline]
 vmsplice_to_pipe fs/splice.c:1551 [inline]
 __do_sys_vmsplice fs/splice.c:1608 [inline]
 __se_sys_vmsplice+0x42b/0xfd0 fs/splice.c:1578
 __x64_sys_vmsplice+0x55/0x70 fs/splice.c:1578
 x64_sys_call+0x28e9/0x3020 arch/x86/include/generated/asm/syscalls_64.h:279
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000002 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 9863 Comm: syz.1.2745 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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