syzbot

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BUG: KCSAN: data-race in pipe_poll / pipe_release

write to 0xffff88811585f128 of 4 bytes by task 4360 on cpu 0:
 pipe_release+0xad/0x1c0 fs/pipe.c:731
 __fput+0x17a/0x6d0 fs/file_table.c:431
 ____fput+0x1c/0x30 fs/file_table.c:459
 task_work_run+0x13a/0x1a0 kernel/task_work.c:228
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x5dd/0x17f0 kernel/exit.c:939
 do_group_exit+0x142/0x150 kernel/exit.c:1088
 __do_sys_exit_group kernel/exit.c:1099 [inline]
 __se_sys_exit_group kernel/exit.c:1097 [inline]
 __x64_sys_exit_group+0x1f/0x20 kernel/exit.c:1097
 x64_sys_call+0x2d5d/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811585f128 of 4 bytes by task 3256 on cpu 1:
 pipe_poll+0x177/0x250 fs/pipe.c:689
 vfs_poll include/linux/poll.h:84 [inline]
 do_select+0x8d2/0xf70 fs/select.c:535
 core_sys_select+0x362/0x530 fs/select.c:678
 do_pselect fs/select.c:760 [inline]
 __do_sys_pselect6 fs/select.c:803 [inline]
 __se_sys_pselect6+0x204/0x270 fs/select.c:794
 __x64_sys_pselect6+0x78/0x90 fs/select.c:794
 x64_sys_call+0x26f7/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:271
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000001 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3256 Comm: syz-executor Tainted: G        W          6.11.0-syzkaller-12113-ge7ed34365879 #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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