linux-kernel - Re: [PATCH v2] media: verisilicon: Fix crash when probing encoder

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Message-ID: <12724349.O9o76ZdvQC@bagend>
Date:   Tue, 23 May 2023 00:38:37 +0200
From:   Diederik de Haas <didi.debian@...ow.org>
To:     Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>
Cc:     p.zabel@...gutronix.de, mchehab@...nel.org,
        m.szyprowski@...sung.com, linux-media@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com
Subject: Re: [PATCH v2] media: verisilicon: Fix crash when probing encoder

On Monday, 22 May 2023 18:17:39 CEST Benjamin Gaignard wrote:
> Le 20/05/2023 à 00:34, Diederik de Haas a écrit :
> > On Thursday, 13 April 2023 21:52:50 CEST Nicolas Dufresne wrote:
> >> Le jeudi 13 avril 2023 à 10:10 -0300, Ezequiel Garcia a écrit :
> >>> Benjamin,
> >>> 
> >>> Please include the crash stracktrace in the commit.
> >> 
> >> Careful with HTML message, they don't always make it in these ML and
> >> tooling might not play well with the tooling. Perhaps it can be edited
> >> while pulling ? Here's the info from Marek's bug report:
> >> 
> >> hantro-vpu fdea0000.video-codec: Adding to iommu group 0
> >> hantro-vpu fdea0000.video-codec: registered rockchip,rk3568-vpu-dec as
> >> /dev/video0
> >> hantro-vpu fdee0000.video-codec: Adding to iommu group 1
> >> hantro-vpu fdee0000.video-codec: registered rockchip,rk3568-vepu-enc as
> >> /dev/video1
> >> Unable to handle kernel NULL pointer dereference at virtual address
> >> 0000000000000008
> >> Mem abort info:
> >> ESR = 0x0000000096000004
> >> EC = 0x25: DABT (current EL), IL = 32 bits
> >> SET = 0, FnV = 0
> >> EA = 0, S1PTW = 0
> >> FSC = 0x04: level 0 translation fault
> >> Data abort info:
> >> ISV = 0, ISS = 0x00000004
> >> CM = 0, WnR = 0
> >> user pgtable: 4k pages, 48-bit VAs, pgdp=00000001f446f000
> >> [0000000000000008] pgd=0000000000000000, p4d=0000000000000000
> >> Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
> >> Modules linked in: hantro_vpu v4l2_vp9 v4l2_h264 v4l2_mem2mem
> >> videobuf2_dma_contig snd_soc_simple_card display_connector
> >> snd_soc_simple_card_utils videobuf2_memops crct10dif_ce dwmac_rk
> >> rockchip_thermal videobuf2_v4l2 stmmac_platform rockchip_saradc
> >> industrialio_triggered_buffer kfifo_buf stmmac videodev pcs_xpcs
> >> rtc_rk808 videobuf2_common rockchipdrm panfrost mc drm_shmem_helper
> >> analogix_dp gpu_sched dw_mipi_dsi dw_hdmi drm_display_helper ip_tables
> >> x_tables ipv6
> >> CPU: 3 PID: 171 Comm: v4l_id Not tainted 6.3.0-rc2+ #13478
> >> Hardware name: Hardkernel ODROID-M1 (DT)
> >> pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> >> pc : hantro_try_fmt+0xb4/0x280 [hantro_vpu]
> >> lr : hantro_try_fmt+0xa8/0x280 [hantro_vpu]
> >> ...
> >> Call trace:
> >> hantro_try_fmt+0xb4/0x280 [hantro_vpu]
> >> hantro_set_fmt_out+0x3c/0x278 [hantro_vpu]
> >> hantro_reset_raw_fmt+0x94/0xb4 [hantro_vpu]
> >> hantro_set_fmt_cap+0x23c/0x250 [hantro_vpu]
> >> hantro_reset_fmts+0x94/0xcc [hantro_vpu]
> >> hantro_open+0xd4/0x20c [hantro_vpu]
> >> v4l2_open+0x80/0x120 [videodev]
> >> chrdev_open+0xc0/0x22c
> >> do_dentry_open+0x13c/0x490
> >> vfs_open+0x2c/0x38
> >> path_openat+0x550/0x938
> >> do_filp_open+0x80/0x12c
> >> do_sys_openat2+0xb4/0x16c
> >> __arm64_sys_openat+0x64/0xac
> >> invoke_syscall+0x48/0x114
> >> el0_svc_common.constprop.0+0xfc/0x11c
> >> do_el0_svc+0x38/0xa4
> >> el0_svc+0x48/0xb8
> >> el0t_64_sync_handler+0xb8/0xbc
> >> el0t_64_sync+0x190/0x194
> >> Code: 97fe726c f940aa80 52864a61 72a686c1 (b9400800)
> >> ---[ end trace 0000000000000000 ]---
> > 
> > When I booted into my 6.4-rc1 (but also rc2) kernel on my
> > Pine64 Quartz64 Model A, I noticed a crash which seems the same as
> > above, but I didn't have such a crash with my 6.3 kernel.
> > Searching for 'hantro' led me to this commit as the most likely culprit
> > but when I build a new 6.4-rcX kernel with this commit reverted,
> > I still had this crash.
> > Do you have suggestions which commit would then be the likely culprit?
> 
> This patch fix the crash at boot time, revert it doesn't seem to be the
> solution. Maybe this proposal from Marek can help you ?
> https://patchwork.kernel.org/project/linux-media/patch/20230421104759.223646
> 3-1-m.szyprowski@...sung.com/

That helped :) After applying that patch I no longer have the crash.
Thanks!

Regards,
  Diederik
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