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

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Message-ID: <CA+G9fYtUp3Bk-5biynickO5U98CKKN1nkE7ooxJHp7dT1g3rxw@mail.gmail.com>
Date: Fri, 17 Oct 2025 14:50:31 +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>, 
	LTP List <ltp@...ts.linux.it>
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>, chrubis <chrubis@...e.cz>, 
	Petr Vorel <pvorel@...e.cz>, Andrea Cervesato <andrea.cervesato@...e.com>
Subject: Re: 6.18.0-rc1: LTP syscalls ioctl_pidfd05: TFAIL: ioctl(pidfd,
 PIDFD_GET_INFO_SHORT, info_invalid) expected EINVAL: ENOTTY (25)

+ LTP mailing list,

On Fri, 17 Oct 2025 at 14:21, Naresh Kamboju <naresh.kamboju@...aro.org> wrote:
>
> 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.

[Not a kernel regression]

>From the recent LTP upgrade we have newly added test cases,
ioctl_pidfd()

The test case is meant to test,

Add ioctl_pidfd05 test
Verify that ioctl() raises an EINVAL error when PIDFD_GET_INFO
 is used.
 This happens when:
   - info parameter is NULL
   - info parameter is providing the wrong size

However, we need to investigate the reason for failure.

Test case: https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/syscalls/ioctl/ioctl_pidfd05.c

>
> 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

- Naresh