syzbot

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BUG: KCSAN: data-race in pipe_release / pipe_unlock

read-write to 0xffff88811d68ede4 of 4 bytes by task 14654 on cpu 1:
 put_pipe_info fs/pipe.c:714 [inline]
 pipe_release+0x16a/0x1d0 fs/pipe.c:744
 __fput+0x29b/0x630 fs/file_table.c:510
 ____fput+0x1c/0x30 fs/file_table.c:538
 task_work_run+0x130/0x1a0 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
 exit_to_user_mode_loop+0x211/0x820 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x232/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811d68ede4 of 4 bytes by task 14660 on cpu 0:
 pipe_unlock+0x17/0x50 fs/pipe.c:97
 link_pipe fs/splice.c:1920 [inline]
 do_tee+0x59c/0x910 fs/splice.c:1965
 __do_sys_tee fs/splice.c:1993 [inline]
 __se_sys_tee+0x93/0x130 fs/splice.c:1977
 __x64_sys_tee+0x55/0x70 fs/splice.c:1977
 x64_sys_call+0x28bd/0x3020 arch/x86/include/generated/asm/syscalls_64.h:277
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 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: 14660 Comm: syz.5.2690 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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