Backtrace in media_pipeline_stop with bcm2835-unicam

Backtrace in media_pipeline_stop with bcm2835-unicam

[Florian Echtler]

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Hello everyone,

I'm running a Raspberry Pi with HQ camera as timelapse webcam. Everything seems 
to be working fine, so this is probably relatively low priority, but I still 
wanted to mention that I'm getting the following backtrace in 
media_pipeline_stop for every picture taken with libcamera:

[244731.171175] ------------[ cut here ]------------
[244731.171210] WARNING: CPU: 0 PID: 900 at drivers/media/mc/mc-entity.c:873 
media_pipeline_stop+0x28/0x34 [mc]
[244731.171417] Modules linked in: cmac algif_hash aes_arm aes_generic ecb 
algif_skcipher af_alg bnep imx477 hci_uart btbcm bluetooth brcmfmac ecdh_generic 
ecc libaes vc4 brcmutil sha256_generic libsha256 snd_soc_hdmi_codec 8021q garp 
stp llc drm_display_helper cec cfg80211 drm_dma_helper drm_kms_helper 
snd_soc_core bcm2835_unicam snd_compress v4l2_dv_timings snd_pcm_dmaengine 
syscopyarea v4l2_fwnode sysfillrect sysimgblt bcm2835_codec(C) i2c_mux_pinctrl 
fb_sys_fops i2c_mux raspberrypi_hwmon v4l2_async bcm2835_v4l2(C) bcm2835_isp(C) 
v4l2_mem2mem bcm2835_mmal_vchiq(C) rfkill videobuf2_vmalloc videobuf2_dma_contig 
videobuf2_memops videobuf2_v4l2 videobuf2_common snd_bcm2835(C) videodev snd_pcm 
snd_timer i2c_bcm2835 snd vc_sm_cma(C) mc uio_pdrv_genirq uio fixed drm fuse 
drm_panel_orientation_quirks backlight ip_tables x_tables ipv6
[244731.171829] CPU: 0 PID: 900 Comm: raspberry_fakeh Tainted: G        WC 
   6.1.19+ #1637
[244731.171848] Hardware name: BCM2835
[244731.171865]  unwind_backtrace from show_stack+0x18/0x1c
[244731.171904]  show_stack from dump_stack_lvl+0x34/0x58
[244731.171934]  dump_stack_lvl from __warn+0x7c/0xf8
[244731.171967]  __warn from warn_slowpath_fmt+0x60/0xcc
[244731.172002]  warn_slowpath_fmt from media_pipeline_stop+0x28/0x34 [mc]
[244731.172150]  media_pipeline_stop [mc] from unicam_stop_streaming+0x88/0x168 
[bcm2835_unicam]
[244731.172343]  unicam_stop_streaming [bcm2835_unicam] from 
__vb2_queue_cancel+0x30/0x284 [videobuf2_common]
[244731.172554]  __vb2_queue_cancel [videobuf2_common] from 
vb2_core_streamoff+0x20/0xb8 [videobuf2_common]
[244731.172739]  vb2_core_streamoff [videobuf2_common] from 
__video_do_ioctl+0x224/0x458 [videodev]
[244731.173460]  __video_do_ioctl [videodev] from video_usercopy+0x118/0x574 
[videodev]
[244731.174268]  video_usercopy [videodev] from sys_ioctl+0x10c/0x90c
[244731.174705]  sys_ioctl from ret_fast_syscall+0x0/0x1c
[244731.174732] Exception stack(0xdc905fa8 to 0xdc905ff0)
[244731.174752] 5fa0:                   a4311ef0 a430d65c 0000000f 40045613 
a4312f30 00000000
[244731.174770] 5fc0: a4311ef0 a430d65c a430d670 00000036 0238e568 00000000 
b6e90134 0238e508
[244731.174783] 5fe0: a52b9d44 a4cc770c a5237940 b6d0dd4c
[244731.174795] ---[ end trace 0000000000000000 ]---

Best, Florian
-- 
SENT FROM MY DEC VT50 TERMINAL

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Re: Backtrace in media_pipeline_stop with bcm2835-unicam

[Dave Stevenson]

Hi Florian

On Tue, 28 Mar 2023 at 08:52, Florian Echtler <floe@butterbrot.org> wrote:
>
> Hello everyone,
>
> I'm running a Raspberry Pi with HQ camera as timelapse webcam. Everything seems
> to be working fine, so this is probably relatively low priority, but I still
> wanted to mention that I'm getting the following backtrace in
> media_pipeline_stop for every picture taken with libcamera:

bcm2835-unicam hasn't been merged to mainline as yet - it's only in
our downstream kernel tree.

Please raise an issue on https://github.com/raspberrypi/linux/issues/,
or start a thread on our forums.

Thanks
  Dave

> [244731.171175] ------------[ cut here ]------------
> [244731.171210] WARNING: CPU: 0 PID: 900 at drivers/media/mc/mc-entity.c:873
> media_pipeline_stop+0x28/0x34 [mc]
> [244731.171417] Modules linked in: cmac algif_hash aes_arm aes_generic ecb
> algif_skcipher af_alg bnep imx477 hci_uart btbcm bluetooth brcmfmac ecdh_generic
> ecc libaes vc4 brcmutil sha256_generic libsha256 snd_soc_hdmi_codec 8021q garp
> stp llc drm_display_helper cec cfg80211 drm_dma_helper drm_kms_helper
> snd_soc_core bcm2835_unicam snd_compress v4l2_dv_timings snd_pcm_dmaengine
> syscopyarea v4l2_fwnode sysfillrect sysimgblt bcm2835_codec(C) i2c_mux_pinctrl
> fb_sys_fops i2c_mux raspberrypi_hwmon v4l2_async bcm2835_v4l2(C) bcm2835_isp(C)
> v4l2_mem2mem bcm2835_mmal_vchiq(C) rfkill videobuf2_vmalloc videobuf2_dma_contig
> videobuf2_memops videobuf2_v4l2 videobuf2_common snd_bcm2835(C) videodev snd_pcm
> snd_timer i2c_bcm2835 snd vc_sm_cma(C) mc uio_pdrv_genirq uio fixed drm fuse
> drm_panel_orientation_quirks backlight ip_tables x_tables ipv6
> [244731.171829] CPU: 0 PID: 900 Comm: raspberry_fakeh Tainted: G        WC
>    6.1.19+ #1637
> [244731.171848] Hardware name: BCM2835
> [244731.171865]  unwind_backtrace from show_stack+0x18/0x1c
> [244731.171904]  show_stack from dump_stack_lvl+0x34/0x58
> [244731.171934]  dump_stack_lvl from __warn+0x7c/0xf8
> [244731.171967]  __warn from warn_slowpath_fmt+0x60/0xcc
> [244731.172002]  warn_slowpath_fmt from media_pipeline_stop+0x28/0x34 [mc]
> [244731.172150]  media_pipeline_stop [mc] from unicam_stop_streaming+0x88/0x168
> [bcm2835_unicam]
> [244731.172343]  unicam_stop_streaming [bcm2835_unicam] from
> __vb2_queue_cancel+0x30/0x284 [videobuf2_common]
> [244731.172554]  __vb2_queue_cancel [videobuf2_common] from
> vb2_core_streamoff+0x20/0xb8 [videobuf2_common]
> [244731.172739]  vb2_core_streamoff [videobuf2_common] from
> __video_do_ioctl+0x224/0x458 [videodev]
> [244731.173460]  __video_do_ioctl [videodev] from video_usercopy+0x118/0x574
> [videodev]
> [244731.174268]  video_usercopy [videodev] from sys_ioctl+0x10c/0x90c
> [244731.174705]  sys_ioctl from ret_fast_syscall+0x0/0x1c
> [244731.174732] Exception stack(0xdc905fa8 to 0xdc905ff0)
> [244731.174752] 5fa0:                   a4311ef0 a430d65c 0000000f 40045613
> a4312f30 00000000
> [244731.174770] 5fc0: a4311ef0 a430d65c a430d670 00000036 0238e568 00000000
> b6e90134 0238e508
> [244731.174783] 5fe0: a52b9d44 a4cc770c a5237940 b6d0dd4c
> [244731.174795] ---[ end trace 0000000000000000 ]---
>
> Best, Florian
> --
> SENT FROM MY DEC VT50 TERMINAL