Re: regression with mainline kernel

[Sudip Mukherjee <sudipm.mukherjee@gmail.com>]

Hi Linus,

On Thu, Nov 11, 2021 at 2:03 PM Sudip Mukherjee
<sudipm.mukherjee@gmail.com> wrote:
>
> Hi Linus,
>
> My testing has been failing for the last few days. Last good test was
> with 6f2b76a4a384 and I started seeing the failure with ce840177930f5
> where boot timeout.
>
> Last good test - https://openqa.qa.codethink.co.uk/tests/323
> Failing test - https://openqa.qa.codethink.co.uk/tests/335
>
> Saw a similar issue with 5.10.79-rc1 today and bisect showed the
> problem with 8615ff6dd1ac but that was already in the last good test I
> had.

Did a bisect and this is a separate issue than the one we saw in 5.10.79-rc1.

The bisect log:
# bad: [ce840177930f591a181f55515fc6ac9e1f56b84a] Merge tag
'defconfig-5.16' of
git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
# good: [6f2b76a4a384e05ac8d3349831f29dff5de1e1e2] Merge tag
'Smack-for-5.16' of https://github.com/cschaufler/smack-next
git bisect start 'ce840177930f5' '6f2b76a4a384e05ac8d3349831f29dff5de1e1e2'
# good: [a64a325bf6313aa5cde7ecd691927e92892d1b7f] Merge tag
'afs-next-20211102' of
git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
git bisect good a64a325bf6313aa5cde7ecd691927e92892d1b7f
# bad: [dcd68326d29b62f3039e4f4d23d3e38f24d37360] Merge tag
'devicetree-for-5.16' of
git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux
git bisect bad dcd68326d29b62f3039e4f4d23d3e38f24d37360
# bad: [c7c774fe09389fc806bbe4b487c18e45f576c1ae] Merge tag
'drm-intel-next-2021-10-04' of
git://anongit.freedesktop.org/drm/drm-intel into drm-next
git bisect bad c7c774fe09389fc806bbe4b487c18e45f576c1ae
# good: [8017ecb11ebbcdfcbdff14c5edbdf1efc14991f4] drm/amd/display:
Added root clock optimization flags
git bisect good 8017ecb11ebbcdfcbdff14c5edbdf1efc14991f4
# good: [8a1ec3f3275479292613273a7be2ac87f2a7f6e6] drm/i915: Remove
DP_PORT_EN stuff from link training code
git bisect good 8a1ec3f3275479292613273a7be2ac87f2a7f6e6
# bad: [9962601ca5719050906915c3c33a63744ac7b15c] drm/bridge:
dw-hdmi-cec: Make use of the helper function
devm_add_action_or_reset()
git bisect bad 9962601ca5719050906915c3c33a63744ac7b15c
# bad: [606b102876e3741851dfb09d53f3ee57f650a52c] drm: fb_helper: fix
CONFIG_FB dependency
git bisect bad 606b102876e3741851dfb09d53f3ee57f650a52c
# good: [c43da06c24a485308e80d709737b446e8cad175d] dt-bindings:
drm/panel: boe-tv101wum-nl6: Support enabling a 3.3V rail
git bisect good c43da06c24a485308e80d709737b446e8cad175d
# good: [8d6b006e1f51c99016aa39ca9e03947cbdd024e3] drm/virtio:
implement context init: handle VIRTGPU_CONTEXT_PARAM_POLL_RINGS_MASK
git bisect good 8d6b006e1f51c99016aa39ca9e03947cbdd024e3
# bad: [d0f5d790ae863079025398015eb59347b01db455] drm/ttm: remove
TTM_PAGE_FLAG_NO_RETRY
git bisect bad d0f5d790ae863079025398015eb59347b01db455
# bad: [f5d28856b89baab4232a9f841e565763fcebcdf9] drm/ttm: stop
calling tt_swapin in vm_access
git bisect bad f5d28856b89baab4232a9f841e565763fcebcdf9
# bad: [78aa20fa4381623cf59a85d053486f98784ca3a0] drm/virtio:
implement context init: advertise feature to userspace
git bisect bad 78aa20fa4381623cf59a85d053486f98784ca3a0
# bad: [cd7f5ca33585918febe5e2f6dc090a21cfa775b0] drm/virtio:
implement context init: add virtio_gpu_fence_event
git bisect bad cd7f5ca33585918febe5e2f6dc090a21cfa775b0
# first bad commit: [cd7f5ca33585918febe5e2f6dc090a21cfa775b0]
drm/virtio: implement context init: add virtio_gpu_fence_event

And, indeed reverting cd7f5ca33585 on top of debe436e77c7 has fixed
the problem I was seeing on my qemu test of x86_64. The qemu image is
based on Ubuntu.

Will be happy to test any fix or more debugging if needed.


-- 
Regards
Sudip