On Mon, Jul 14, 2025 at 05:13:04PM +0200, Thomas Zimmermann wrote:
> Use the color format stored in struct drm_sysfb_crtc_state for
> color-format conversion instead of the scanout-buffer format
> announced by firmware. Currently, both values are identical.

This patch, which is in -next as
061963cd9e5b60672695e9a592be440469a6bf72, breaks boot on the original
Raspberry Pi.  We get an oops after initialising the console:

[    4.057189] Console: switching to colour dummy device 80x30
[    4.057903] 8<--- cut here ---
[    4.057990] Unable to handle kernel NULL pointer dereference at virtual 
address 00000048 when read

...

[    4.423159] Call trace: 
[    4.423196]  drm_sysfb_plane_helper_atomic_disable from 
drm_atomic_helper_commit_planes+0x188/0x274
[    4.434958]  drm_atomic_helper_commit_planes from 
drm_atomic_helper_commit_tail+0x30/0x68
[    4.443259]  drm_atomic_helper_commit_tail from commit_tail+0x144/0x154
[    4.449984]  commit_tail from drm_atomic_helper_commit+0xfc/0x10c
[    4.456183]  drm_atomic_helper_commit from drm_atomic_commit+0xc4/0xf4
[    4.462842]  drm_atomic_commit from drm_framebuffer_remove+0x220/0x4f0
[    4.469495]  drm_framebuffer_remove from drm_mode_rmfb_work_fn+0x70/0x78
[    4.476306]  drm_mode_rmfb_work_fn from process_scheduled_works+0x198/0x290
[    4.483378]  process_scheduled_works from worker_thread+0x16c/0x1f8

Full log:

   https://lava.sirena.org.uk/scheduler/job/1741780#L776

Bisect log, with links to additional logs:

# bad: [3c642997252eef4449cb6b6e02af3dc22515d817] Add linux-next specific files 
for 20250827
# good: [f51af24f910debef214edf108f7efad30874bc4f] Merge branch 
'for-linux-next-fixes' of https://gitlab.freedesktop.org/drm/misc/kernel.git
# good: [a12b74d2bd4724ee1883bc97ec93eac8fafc8d3c] ASoC: tlv320aic32x4: use 
dev_err_probe() for regulators
# good: [f840737d1746398c2993be34bfdc80bdc19ecae2] ASoC: SOF: imx: Remove the 
use of dev_err_probe()
# good: [d78e48ebe04e9566f8ecbf51471e80da3adbceeb] ASoC: dt-bindings: Minor 
whitespace cleanup in example
# good: [96bcb34df55f7fee99795127c796315950c94fed] ASoC: test-component: Use 
kcalloc() instead of kzalloc()
# good: [c232495d28ca092d0c39b10e35d3d613bd2414ab] ASoC: dt-bindings: 
omap-twl4030: convert to DT schema
# good: [27848c082ba0b22850fd9fb7b185c015423dcdc7] spi: s3c64xx: Remove the use 
of dev_err_probe()
# good: [ec0be3cdf40b5302248f3fb27a911cc630e8b855] regulator: consumer.rst: 
document bulk operations
# good: [da9881d00153cc6d3917f6b74144b1d41b58338c] ASoC: qcom: audioreach: add 
support for SMECNS module
# good: [c1dd310f1d76b4b13f1854618087af2513140897] spi: SPISG: Use 
devm_kcalloc() in aml_spisg_clk_init()
# good: [2a55135201d5e24b80b7624880ff42eafd8e320c] ASoC: Intel: avs: Streamline 
register-component function names
# good: [550bc517e59347b3b1af7d290eac4fb1411a3d4e] regulator: bd718x7: Use 
kcalloc() instead of kzalloc()
# good: [0056b410355713556d8a10306f82e55b28d33ba8] spi: offload trigger: 
adi-util-sigma-delta: clean up imports
# good: [cf65182247761f7993737b710afe8c781699356b] ASoC: codecs: wsa883x: 
Handle shared reset GPIO for WSA883x speakers
# good: [90179609efa421b1ccc7d8eafbc078bafb25777c] spi: spl022: use min_t() to 
improve code
# good: [daf855f76a1210ceed9541f71ac5dd9be02018a6] ASoC: es8323: enable DAPM 
power widgets for playback DAC
# good: [48124569bbc6bfda1df3e9ee17b19d559f4b1aa3] spi: remove unneeded 
'fast_io' parameter in regmap_config
# good: [258384d8ce365dddd6c5c15204de8ccd53a7ab0a] ASoC: es8323: enable DAPM 
power widgets for playback DAC and output
# good: [6d068f1ae2a2f713d7f21a9a602e65b3d6b6fc6d] regulator: rt5133: Fix 
spelling mistake "regualtor" -> "regulator"
# good: [a46e95c81e3a28926ab1904d9f754fef8318074d] ASoC: wl1273: Remove
# good: [0e62438e476494a1891a8822b9785bc6e73e9c3f] ASoC: Intel: sst: Remove 
redundant semicolons
# good: [37533933bfe92cd5a99ef4743f31dac62ccc8de0] regulator: remove unneeded 
'fast_io' parameter in regmap_config
# good: [5c36b86d2bf68fbcad16169983ef7ee8c537db59] regmap: Remove superfluous 
check for !config in __regmap_init()
# good: [714165e1c4b0d5b8c6d095fe07f65e6e7047aaeb] regulator: rt5133: Add 
RT5133 PMIC regulator Support
# good: [9c45f95222beecd6a284fd1284d54dd7a772cf59] spi: spi-qpic-snand: handle 
'use_ecc' parameter of qcom_spi_config_cw_read()
# good: [bab4ab484a6ca170847da9bffe86f1fa90df4bbe] ASoC: dt-bindings: Convert 
brcm,bcm2835-i2s to DT schema
# good: [b832b19318534bb4f1673b24d78037fee339c679] spi: loopback-test: Don't 
use %pK through printk
# good: [8c02c8353460f8630313aef6810f34e134a3c1ee] ASoC: dt-bindings: 
realtek,alc5623: convert to DT schema
# good: [6b7e2aa50bdaf88cd4c2a5e2059a7bf32d85a8b1] spi: spi-qpic-snand: remove 
'clr*status' members of struct 'qpic_ecc'
# good: [2291a2186305faaf8525d57849d8ba12ad63f5e7] MAINTAINERS: Add entry for 
FourSemi audio amplifiers
# good: [a54ef14188519a0994d0264f701f5771815fa11e] regulator: dt-bindings: 
Clean-up active-semi,act8945a duplication
# good: [cf25eb8eae91bcae9b2065d84b0c0ba0f6d9dd34] ASoC: soc-component: unpack 
snd_soc_component_init_bias_level()
# good: [595b7f155b926460a00776cc581e4dcd01220006] ASoC: Intel: avs: 
Conditional-path support
# good: [a1d0b0ae65ae3f32597edfbb547f16c75601cd87] spi: spi-qpic-snand: avoid 
double assignment in qcom_spi_probe()
# good: [3059067fd3378a5454e7928c08d20bf3ef186760] ASoC: cs48l32: Use 
PTR_ERR_OR_ZERO() to simplify code
# good: [9a200cbdb54349909a42b45379e792e4b39dd223] rust: regulator: implement 
Send and Sync for Regulator<T>
# good: [2d86d2585ab929a143d1e6f8963da1499e33bf13] ASoC: pxa: add 
GPIOLIB_LEGACY dependency
# good: [886f42ce96e7ce80545704e7168a9c6b60cd6c03] regmap: mmio: Add missing 
MODULE_DESCRIPTION()
# good: [162e23657e5379f07c6404dbfbf4367cb438ea7d] regulator: pf0900: Add PMIC 
PF0900 support
git bisect start '3c642997252eef4449cb6b6e02af3dc22515d817' 
'f51af24f910debef214edf108f7efad30874bc4f' 
'a12b74d2bd4724ee1883bc97ec93eac8fafc8d3c' 
'f840737d1746398c2993be34bfdc80bdc19ecae2' 
'd78e48ebe04e9566f8ecbf51471e80da3adbceeb' 
'96bcb34df55f7fee99795127c796315950c94fed' 
'c232495d28ca092d0c39b10e35d3d613bd2414ab' 
'27848c082ba0b22850fd9fb7b185c015423dcdc7' 
'ec0be3cdf40b5302248f3fb27a911cc630e8b855' 
'da9881d00153cc6d3917f6b74144b1d41b58338c' 
'c1dd310f1d76b4b13f1854618087af2513140897' 
'2a55135201d5e24b80b7624880ff42eafd8e320c' 
'550bc517e59347b3b1af7d290eac4fb1411a3d4e' 
'0056b410355713556d8a10306f82e55b28d33ba8' 
'cf65182247761f7993737b710afe8c781699356b' 
'90179609efa421b1ccc7d8eafbc078bafb25777c' 
'daf855f76a1210ceed9541f71ac5dd9be02018a6' 
'48124569bbc6bfda1df3e9ee17b19d559f4b1aa3' 
'258384d8ce365dddd6c5c15204de8ccd53a7ab0a' 
'6d068f1ae2a2f713d7f21a9a602e65b3d6b6fc6d' 
'a46e95c81e3a28926ab1904d9f754fef8318074d' 
'0e62438e476494a1891a8822b9785bc6e73e9c3f' 
'37533933bfe92cd5a99ef4743f31dac62ccc8de0' 
'5c36b86d2bf68fbcad16169983ef7ee8c537db59' 
'714165e1c4b0d5b8c6d095fe07f65e6e7047aaeb' 
'9c45f95222beecd6a284fd1284d54dd7a772cf59' 
'bab4ab484a6ca170847da9bffe86f1fa90df4bbe' 
'b832b19318534bb4f1673b24d78037fee339c679' 
'8c02c8353460f8630313aef6810f34e134a3c1ee' 
'6b7e2aa50bdaf88cd4c2a5e2059a7bf32d85a8b1' 
'2291a2186305faaf8525d57849d8ba12ad63f5e7' 
'a54ef14188519a0994d0264f701f5771815fa11e' 
'cf25eb8eae91bcae9b2065d84b0c0ba0f6d9dd34' 
'595b7f155b926460a00776cc581e4dcd01220006' 
'a1d0b0ae65ae3f32597edfbb547f16c75601cd87' 
'3059067fd3378a5454e7928c08d20bf3ef186760' 
'9a200cbdb54349909a42b45379e792e4b39dd223' 
'2d86d2585ab929a143d1e6f8963da1499e33bf13' 
'886f42ce96e7ce80545704e7168a9c6b60cd6c03' 
'162e23657e5379f07c6404dbfbf4367cb438ea7d'
# test job: [a12b74d2bd4724ee1883bc97ec93eac8fafc8d3c] 
https://lava.sirena.org.uk/scheduler/job/1734135
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https://lava.sirena.org.uk/scheduler/job/1727230
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https://lava.sirena.org.uk/scheduler/job/1706206
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https://lava.sirena.org.uk/scheduler/job/1699727
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https://lava.sirena.org.uk/scheduler/job/1699713
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https://lava.sirena.org.uk/scheduler/job/1693185
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https://lava.sirena.org.uk/scheduler/job/1694260
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https://lava.sirena.org.uk/scheduler/job/1693330
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https://lava.sirena.org.uk/scheduler/job/1693130
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https://lava.sirena.org.uk/scheduler/job/1685827
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https://lava.sirena.org.uk/scheduler/job/1685690
# test job: [0056b410355713556d8a10306f82e55b28d33ba8] 
https://lava.sirena.org.uk/scheduler/job/1685834
# test job: [cf65182247761f7993737b710afe8c781699356b] 
https://lava.sirena.org.uk/scheduler/job/1687590
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https://lava.sirena.org.uk/scheduler/job/1685811
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https://lava.sirena.org.uk/scheduler/job/1685552
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https://lava.sirena.org.uk/scheduler/job/1670240
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https://lava.sirena.org.uk/scheduler/job/1673449
# test job: [6d068f1ae2a2f713d7f21a9a602e65b3d6b6fc6d] 
https://lava.sirena.org.uk/scheduler/job/1673208
# test job: [a46e95c81e3a28926ab1904d9f754fef8318074d] 
https://lava.sirena.org.uk/scheduler/job/1673819
# test job: [0e62438e476494a1891a8822b9785bc6e73e9c3f] 
https://lava.sirena.org.uk/scheduler/job/1669629
# test job: [37533933bfe92cd5a99ef4743f31dac62ccc8de0] 
https://lava.sirena.org.uk/scheduler/job/1669021
# test job: [5c36b86d2bf68fbcad16169983ef7ee8c537db59] 
https://lava.sirena.org.uk/scheduler/job/1667994
# test job: [714165e1c4b0d5b8c6d095fe07f65e6e7047aaeb] 
https://lava.sirena.org.uk/scheduler/job/1667749
# test job: [9c45f95222beecd6a284fd1284d54dd7a772cf59] 
https://lava.sirena.org.uk/scheduler/job/1667650
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https://lava.sirena.org.uk/scheduler/job/1664754
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https://lava.sirena.org.uk/scheduler/job/1659321
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https://lava.sirena.org.uk/scheduler/job/1659043
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https://lava.sirena.org.uk/scheduler/job/1653171
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# test job: [2d86d2585ab929a143d1e6f8963da1499e33bf13] 
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# test job: [886f42ce96e7ce80545704e7168a9c6b60cd6c03] 
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# test job: [162e23657e5379f07c6404dbfbf4367cb438ea7d] 
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# test job: [3c642997252eef4449cb6b6e02af3dc22515d817] 
https://lava.sirena.org.uk/scheduler/job/1741780
# bad: [3c642997252eef4449cb6b6e02af3dc22515d817] Add linux-next specific files 
for 20250827
git bisect bad 3c642997252eef4449cb6b6e02af3dc22515d817
# test job: [7902969a2e75fae35b04772a3e75a29737d463bd] 
https://lava.sirena.org.uk/scheduler/job/1741974
# good: [7902969a2e75fae35b04772a3e75a29737d463bd] Merge branch 'for-next' of 
https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git
git bisect good 7902969a2e75fae35b04772a3e75a29737d463bd
# test job: [c72c1b7d500f2e37ae06630ee20add5b68c7723c] 
https://lava.sirena.org.uk/scheduler/job/1742110
# bad: [c72c1b7d500f2e37ae06630ee20add5b68c7723c] Merge branch 'for-next' of 
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap.git
git bisect bad c72c1b7d500f2e37ae06630ee20add5b68c7723c
# test job: [9f26ae24e6a8435d88cfb8c01f7d02c348eb4868] 
https://lava.sirena.org.uk/scheduler/job/1742182
# good: [9f26ae24e6a8435d88cfb8c01f7d02c348eb4868] Merge branch 'drm-next' of 
https://gitlab.freedesktop.org/drm/kernel.git
git bisect good 9f26ae24e6a8435d88cfb8c01f7d02c348eb4868
# test job: [257ad6623adaf1685878a0d8724d5c40aa838e93] 
https://lava.sirena.org.uk/scheduler/job/1742260
# bad: [257ad6623adaf1685878a0d8724d5c40aa838e93] Merge branch 'drm-next' of 
https://gitlab.freedesktop.org/agd5f/linux.git
git bisect bad 257ad6623adaf1685878a0d8724d5c40aa838e93
# test job: [615471b860d628f7e7d9ffdf4b92477493e0a31c] 
https://lava.sirena.org.uk/scheduler/job/1742299
# good: [615471b860d628f7e7d9ffdf4b92477493e0a31c] drm/amd/pm: Remove cache 
logic from SMUv13.0.12
git bisect good 615471b860d628f7e7d9ffdf4b92477493e0a31c
# test job: [e3bd536580fe553d5768673660b1745ff1bb3b91] 
https://lava.sirena.org.uk/scheduler/job/1742396
# good: [e3bd536580fe553d5768673660b1745ff1bb3b91] drm/radeon: Use 
vmalloc_array and vcalloc to simplify code
git bisect good e3bd536580fe553d5768673660b1745ff1bb3b91
# test job: [9d3cc361252ee8ff60d7277a97950300e0340ec4] 
https://lava.sirena.org.uk/scheduler/job/1742517
# good: [9d3cc361252ee8ff60d7277a97950300e0340ec4] drm/amd/display: Consider 
sink max slice width limitation for dsc
git bisect good 9d3cc361252ee8ff60d7277a97950300e0340ec4
# test job: [efe927b9702643a1d80472664c2642f0304cb608] 
https://lava.sirena.org.uk/scheduler/job/1742628
# good: [efe927b9702643a1d80472664c2642f0304cb608] drm/msm: fix 
msm_gem_vma_new() allocations for managed GPUVMs
git bisect good efe927b9702643a1d80472664c2642f0304cb608
# test job: [b3c7edd5e50e0e92ead8794b084e92d89002dd6f] 
https://lava.sirena.org.uk/scheduler/job/1742784
# bad: [b3c7edd5e50e0e92ead8794b084e92d89002dd6f] drm/format-helper: Add 
XRGB8888-to-RGB332 to drm_fb_blit()
git bisect bad b3c7edd5e50e0e92ead8794b084e92d89002dd6f
# test job: [d6d05e2af796ca25094f80a73d8841505d54368b] 
https://lava.sirena.org.uk/scheduler/job/1742821
# good: [d6d05e2af796ca25094f80a73d8841505d54368b] video: screen_info: Add 
pixel-format helper for linear framebuffers
git bisect good d6d05e2af796ca25094f80a73d8841505d54368b
# test job: [061963cd9e5b60672695e9a592be440469a6bf72] 
https://lava.sirena.org.uk/scheduler/job/1742968
# bad: [061963cd9e5b60672695e9a592be440469a6bf72] drm/sysfb: Blit to CRTC 
destination format
git bisect bad 061963cd9e5b60672695e9a592be440469a6bf72
# test job: [31eea29d727ce35b747e68c6be350ca07b7ecd9b] 
https://lava.sirena.org.uk/scheduler/job/1743040
# good: [31eea29d727ce35b747e68c6be350ca07b7ecd9b] drm/sysfb: Find screen_info 
format with helpers
git bisect good 31eea29d727ce35b747e68c6be350ca07b7ecd9b
# first bad commit: [061963cd9e5b60672695e9a592be440469a6bf72] drm/sysfb: Blit 
to CRTC destination format

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