linux-kernel - 6.18.0-rc1: LTP syscalls ioctl_pidfd05: TFAIL: ioctl(pidfd, PIDFD_GET_INFO_SHORT, info

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Message-ID: <CA+G9fYuF44WkxhDj9ZQ1+PwdsU_rHGcYoVqMDr3AL=AvweiCxg@mail.gmail.com>
Date: Fri, 17 Oct 2025 14:21:56 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: open list <linux-kernel@...r.kernel.org>, linux-fsdevel@...r.kernel.org, 
	lkft-triage@...ts.linaro.org, Linux Regressions <regressions@...ts.linux.dev>
Cc: Andrey Albershteyn <aalbersh@...nel.org>, Jan Kara <jack@...e.cz>, Arnd Bergmann <arnd@...db.de>, 
	Christian Brauner <brauner@...nel.org>, Alexander Viro <viro@...iv.linux.org.uk>, 
	Dan Carpenter <dan.carpenter@...aro.org>, Anders Roxell <anders.roxell@...aro.org>, 
	Ben Copeland <benjamin.copeland@...aro.org>
Subject: 6.18.0-rc1: LTP syscalls ioctl_pidfd05: TFAIL: ioctl(pidfd,
 PIDFD_GET_INFO_SHORT, info_invalid) expected EINVAL: ENOTTY (25)

The LTP syscalls ioctl_pidfd05 test failed due to following error on
the Linux mainline
kernel v6.18-rc1-104-g7ea30958b305 on the arm64, arm and x86_64.

The Test case is expecting to fail with EINVAL but found ENOTTY.

Please investigate this reported regression.

First seen on v6.18-rc1-104-g7ea30958b305
Good: 6.18.0-rc1
Bad: 7ea30958b3054f5e488fa0b33c352723f7ab3a2a

Regression Analysis:
- New regression? yes
- Reproducibility? yes

Test regressions: 6.18.0-rc1: LTP syscalls ioctl_pidfd05: TFAIL:
ioctl(pidfd, PIDFD_GET_INFO_SHORT, info_invalid) expected EINVAL:
ENOTTY (25)

Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

## Test error log
tst_buffers.c:57: TINFO: Test is using guarded buffers
tst_test.c:2021: TINFO: LTP version: 20250930
tst_test.c:2024: TINFO: Tested kernel: 6.18.0-rc1 #1 SMP PREEMPT
@1760657272 aarch64
tst_kconfig.c:88: TINFO: Parsing kernel config '/proc/config.gz'
tst_kconfig.c:676: TINFO: CONFIG_TRACE_IRQFLAGS kernel option detected
which might slow the execution
tst_test.c:1842: TINFO: Overall timeout per run is 0h 21m 36s
ioctl_pidfd05.c:45: TPASS: ioctl(pidfd, PIDFD_GET_INFO, NULL) : EINVAL (22)
ioctl_pidfd05.c:46: TFAIL: ioctl(pidfd, PIDFD_GET_INFO_SHORT,
info_invalid) expected EINVAL: ENOTTY (25)
Summary:
passed   1
failed   1

## Source
* Kernel version: 6.18.0-rc1
* Git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
* Git describe: v6.18-rc1-104-g98ac9cc4b445
* Git commit: 98ac9cc4b4452ed7e714eddc8c90ac4ae5da1a09
* Architectures: arm64, x86_64
* Toolchains: gcc-13 clang
* Kconfigs: defconfig+lkftconfig

## Build
* Test log: https://lkft.validation.linaro.org/scheduler/job/8495154#L15590
* Test details:
https://regressions.linaro.org/lkft/linux-mainline-master/v6.18-rc1-104-g98ac9cc4b445/ltp-syscalls/ioctl_pidfd05/
* Build plan: https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/tests/34AVGrBMrEy9qh7gqsguINdUFFt
* Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/34AVFcbKDpJQfCdAQupg3lZzwFY/
* Kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/34AVFcbKDpJQfCdAQupg3lZzwFY/config

--
Linaro LKFT