Re: [PATCH 6.1 000/197] 6.1.132-rc2 review

[Jon Hunter]

Hi Greg,

On 27/03/2025 14:32, Jon Hunter wrote:
> On Wed, 26 Mar 2025 11:44:27 -0400, Greg Kroah-Hartman wrote:
> > This is the start of the stable review cycle for the 6.1.132 release.
> > There are 197 patches in this series, all will be posted as a response
> > to this one.  If anyone has any issues with these being applied, please
> > let me know.
> >
> > Responses should be made by Fri, 28 Mar 2025 15:43:27 +0000.
> > Anything received after that time might be too late.
> >
> > The whole patch series can be found in one patch at:
> > 	https://www.kernel.org/pub/linux/kernel/v6.x/stable-review/patch-6.1.132-rc2.gz
> > or in the git tree and branch at:
> > 	git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-6.1.y
> > and the diffstat can be found below.
> >
> > thanks,
> >
> > greg k-h
>
> Failures detected for Tegra ...
>
> Test results for stable-v6.1:
>      10 builds:	10 pass, 0 fail
>      28 boots:	28 pass, 0 fail
>      115 tests:	109 pass, 6 fail
>
> Linux version:	6.1.132-rc2-gf5ad54ef021f
> Boards tested:	tegra124-jetson-tk1, tegra186-p2771-0000,
>                  tegra186-p3509-0000+p3636-0001, tegra194-p2972-0000,
>                  tegra194-p3509-0000+p3668-0000, tegra20-ventana,
>                  tegra210-p2371-2180, tegra210-p3450-0000,
>                  tegra30-cardhu-a04
>
> Test failures:	tegra186-p2771-0000: cpu-hotplug
>                  tegra194-p2972-0000: pm-system-suspend.sh
>                  tegra210-p2371-2180: cpu-hotplug
>                  tegra210-p3450-0000: cpu-hotplug


I am seeing the following crash ...

[  195.052638] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
[  195.061551] Mem abort info:
[  195.064467]   ESR = 0x0000000096000004
[  195.068244]   EC = 0x25: DABT (current EL), IL = 32 bits
[  195.073551]   SET = 0, FnV = 0
[  195.076604]   EA = 0, S1PTW = 0
[  195.079741]   FSC = 0x04: level 0 translation fault
[  195.084614] Data abort info:
[  195.087493]   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
[  195.092971]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
[  195.098040]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[  195.103347] user pgtable: 4k pages, 48-bit VAs, pgdp=00000001063b9000
[  195.109801] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000
[  195.116605] Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
[  195.122859] Modules linked in: panel_simple snd_soc_tegra210_mixer snd_soc_tegra210_mvc snd_soc_tegra210_ope snd_soc_tegra210_dmic snd_soc_tegra210_amx snd_soc_tegra210_adx snd_soc_tegra210_sfc snd_soc_tegra210_i2s snd_soc_tegra210_admaif tegra_video(C) snd_soc_tegra_pcm tegra_drm v4l2_dv_timings v4l2_fwnode drm_dp_aux_bus v4l2_async cec videobuf2_dma_contig videobuf2_memops drm_display_helper videobuf2_v4l2 videodev drm_kms_helper snd_soc_tegra210_ahub drm tegra210_adma videobuf2_common mc snd_soc_tegra_audio_graph_card crct10dif_ce snd_soc_audio_graph_card snd_soc_simple_card_utils snd_hda_codec_hdmi snd_hda_tegra tegra_aconnect tegra_soctherm tegra_xudc snd_hda_codec lp855x_bl snd_hda_core backlight at24 host1x pwm_tegra ip_tables x_tables ipv6
[  195.189033] CPU: 0 PID: 87 Comm: kworker/0:5 Tainted: G         C         6.6.85-rc2-g0bf29b955eac #1
[  195.198237] Hardware name: NVIDIA Jetson TX1 Developer Kit (DT)
[  195.204144] Workqueue: events work_for_cpu_fn
[  195.208499] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[  195.215448] pc : percpu_ref_put_many.constprop.0+0x18/0xd8
[  195.220924] lr : percpu_ref_put_many.constprop.0+0x18/0xd8
[  195.226398] sp : ffff800082e73bf0
[  195.229704] x29: ffff800082e73bf0 x28: 00000000000000ed x27: 0000000000000028
[  195.236829] x26: 0000000000000000 x25: ffff8000824aa720 x24: 0000000000000000
[  195.243955] x23: 0000000000000000 x22: 0000000000000001 x21: 0000000000000000
[  195.251080] x20: 0000000000000000 x19: 0000000000000000 x18: ffffffffffffffff
[  195.258205] x17: 9397548220450a08 x16: 010100001748ae3c x15: 0000000000000000
[  195.265330] x14: 00000000fffffffc x13: dead000000000100 x12: dead000000000122
[  195.272454] x11: 0000000000000001 x10: 00000000f0000080 x9 : 0000000000000000
[  195.279578] x8 : ffff800082e73c18 x7 : 00000000ffffffff x6 : ffff8000824aa720
[  195.286703] x5 : ffff0000fe924a20 x4 : 0000000000000000 x3 : 0000000000000000
[  195.293827] x2 : ffff80008249d8b8 x1 : ffff000081eb1e00 x0 : 0000000000000001
[  195.300953] Call trace:
[  195.303391]  percpu_ref_put_many.constprop.0+0x18/0xd8
[  195.308518]  memcg_hotplug_cpu_dead+0x54/0x6c
[  195.312868]  cpuhp_invoke_callback+0x118/0x224
[  195.317304]  __cpuhp_invoke_callback_range+0x94/0x120
[  195.322345]  _cpu_down+0x150/0x328
[  195.325742]  __cpu_down_maps_locked+0x18/0x28
[  195.330091]  work_for_cpu_fn+0x1c/0x30
[  195.333831]  process_one_work+0x148/0x288
[  195.337834]  worker_thread+0x32c/0x438
[  195.341576]  kthread+0x118/0x11c
[  195.344798]  ret_from_fork+0x10/0x20
[  195.348369] Code: 910003fd f9000bf3 aa0003f3 97f98ae2 (f9400260)
[  195.354451] ---[ end trace 0000000000000000 ]---

Bisect is pointing to the following commit ...

# first bad commit: [e56ff82e1e164ccf815554694d97bcd3dec9e89a] memcg: drain obj stock on cpu hotplug teardown

Cheers
Jon

--
nvpublic