syzbot

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BUG: KCSAN: data-race in pipe_release / pipe_wait_readable

read-write to 0xffff88810f56e7ec of 4 bytes by task 9446 on cpu 0:
 put_pipe_info fs/pipe.c:706 [inline]
 pipe_release+0x164/0x1c0 fs/pipe.c:736
 __fput+0x303/0x600 fs/file_table.c:384
 ____fput+0x15/0x20 fs/file_table.c:412
 task_work_run+0x135/0x1a0 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 0xffff88810f56e7ec of 4 bytes by task 9428 on cpu 1:
 pipe_lock_nested fs/pipe.c:81 [inline]
 pipe_lock fs/pipe.c:90 [inline]
 pipe_wait_readable+0x1ec/0x240 fs/pipe.c:1054
 splice_from_pipe_next+0x24e/0x390 fs/splice.c:550
 iter_file_splice_write+0x19c/0x7e0 fs/splice.c:695
 do_splice_from fs/splice.c:934 [inline]
 do_splice+0x959/0xf70 fs/splice.c:1295
 __do_splice fs/splice.c:1373 [inline]
 __do_sys_splice fs/splice.c:1584 [inline]
 __se_sys_splice+0x24c/0x380 fs/splice.c:1566
 __x64_sys_splice+0x78/0x90 fs/splice.c:1566
 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: 1 PID: 9428 Comm: syz-executor.2 Not tainted 6.5.0-rc1-syzkaller-00196-gbde7f150276b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
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