linux-kernel - Re: next-20250623: arm64 devices kernel panic Internal error Oops at pidfs_free

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Message-ID: <CA+G9fYsfOg9uiwgYA1mHkBzwEkU6eLweneWJhFybt+X1Ekp55Q@mail.gmail.com>
Date: Mon, 23 Jun 2025 20:26:32 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: Christian Brauner <brauner@...nel.org>
Cc: open list <linux-kernel@...r.kernel.org>, lkft-triage@...ts.linaro.org, 
	Linux Regressions <regressions@...ts.linux.dev>, linux-fsdevel@...r.kernel.org, 
	Jann Horn <jannh@...gle.com>, Josef Bacik <josef@...icpanda.com>, 
	Alexander Mikhalitsyn <alexander@...alicyn.com>, Jeff Layton <jlayton@...nel.org>, 
	Daan De Meyer <daan.j.demeyer@...il.com>, Lennart Poettering <lennart@...ttering.net>, 
	Mike Yuan <me@...dnzj.com>, Zbigniew Jędrzejewski-Szmek <zbyszek@...waw.pl>, 
	Arnd Bergmann <arnd@...db.de>, Dan Carpenter <dan.carpenter@...aro.org>, 
	Anders Roxell <anders.roxell@...aro.org>
Subject: Re: next-20250623: arm64 devices kernel panic Internal error Oops at
 pidfs_free_pid (fs/pidfs.c:162)

On Mon, 23 Jun 2025 at 18:26, Christian Brauner <brauner@...nel.org> wrote:
>
> On Mon, Jun 23, 2025 at 05:29:38PM +0530, Naresh Kamboju wrote:
> > Regressions on arm64 devices and qemu-arm64 while running LTP controllers
> > and selftests cgroup test cases the following kernel Panic Internal error oops
> > found on the Linux next-20250623 tag.
> >
> > Regressions found on arm64 device
> >   - Kernel Panic Internal oops @ LTP controllers
> >   - Kernel Panic Internal oops @ selftest cgroups
> >
> > Test environments:
> >  - Dragonboard-410c
> >  - e850-96
> >  - FVP
> >  - Juno-r2
> >  - rk3399-rock-pi-4b
> >  - qemu-arm64
> >
> > Regression Analysis:
> >  - New regression? Yes
> >  - Reproducibility? Yes
> >
> > Boot regression: arm64 devices kernel panic Internal error Oops at
> > pidfs_free_pid (fs/pidfs.c:162)
> >
> > Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
> >
> > ## Test log
> > [   67.087303] Internal error: Oops: 0000000096000004 [#1]  SMP
> > [   67.094021] Modules linked in: snd_soc_hdmi_codec venus_enc
> > venus_dec videobuf2_dma_contig pm8916_wdt qcom_wcnss_pil
> > coresight_cpu_debug coresight_tmc coresight_replicator qcom_camss
> > coresight_stm snd_soc_lpass_apq8016 msm qrtr coresight_funnel
> > snd_soc_msm8916_digital snd_soc_lpass_cpu coresight_tpiu
> > snd_soc_msm8916_analog videobuf2_dma_sg stm_core coresight_cti
> > snd_soc_lpass_platform snd_soc_apq8016_sbc venus_core
> > snd_soc_qcom_common qcom_q6v5_mss v4l2_fwnode coresight snd_soc_core
> > qcom_pil_info v4l2_async snd_compress llcc_qcom snd_pcm_dmaengine
> > ocmem qcom_q6v5 v4l2_mem2mem videobuf2_memops snd_pcm qcom_sysmon
> > drm_exec adv7511 snd_timer videobuf2_v4l2 gpu_sched qcom_common snd
> > videodev drm_dp_aux_bus qcom_glink_smem soundcore qcom_spmi_vadc
> > mdt_loader drm_display_helper qnoc_msm8916 qmi_helpers
> > videobuf2_common qcom_vadc_common qcom_spmi_temp_alarm rtc_pm8xxx
> > qcom_pon qcom_stats mc cec drm_client_lib qcom_rng rpmsg_ctrl
> > display_connector rpmsg_char phy_qcom_usb_hs socinfo drm_kms_helper
> > rmtfs_mem ramoops
> > [   67.094437]  reed_solomon fuse drm backlight ip_tables x_tables
> > [   67.189084] CPU: 3 UID: 0 PID: 0 Comm: swapper/3 Not tainted
> > 6.16.0-rc3-next-20250623 #1 PREEMPT
> > [   67.194810] Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT)
> > [   67.234078] pc : pidfs_free_pid (fs/pidfs.c:162)
>
> Thanks, I see the issue. I'm pushing out a fix. Please let me know if
> that reproduces in the next few days.

Thanks. Please share the proposed fix patches.
I would like to build and test in LKFT test framework.

- Naresh